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Shop Racing Transmission Parts – Transmission Specialties
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Industry Leading TSI Torque Converters
TSI Powerglide Turbo 400 and 4L8 Transmissions

OVER 40 YEARS OF RACING TRANSMISSIONS

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CUSTOM TORQUE CONVERTER KITS

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Transmission Specialties has the expertise to create custom torque converter kits tailored to your specific needs and performance goals. As the innovators of the spragless converter, TSI uses advanced engineering techniques and precision manufacturing to design and craft quality racing torque converters that optimize power transfer and overall performance. From single disc street converters, to triple disc lock-up race converters, and everything in-between, a custom torque converter from TSI will power you to the winners circle every time.

SPEC A CONVERTER

ABOUT TSI

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For over 40 years Transmission Specialties has been a trusted name in the performance transmission industry, leading the way as pioneers of much of the technology that is now commonplace in the transmission and converter market. TSI takes pride in designing, engineering, and assembling all its products in the USA at its state-of-the-art Philadelphia, PA facility.

From race-ready Powerglide and Turbo 400 transmission kits, to complete torque converter’s, billet machined covers, aerospace quality input shafts, billet valve bodies and much more, TSI has everything you need to shift your race program to the next level.

LEARN MORE ABOUT TSI
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Blog
TSI Operational Update

Posted on April 17, 2025 by jlong

Dear TSI Customers, We’re excited to announce that over the last several months, we’ve t…

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Blog
The Advantages of Upgrading to a TSI Converter

Posted on January 16, 2025 by jlong

If 90% of converter failures stem from a slipping or broken sprag, why include one in a racing conve…

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Blog
The Truth About Spragless Converters For Racing

Posted on January 16, 2025 by jlong

In today’s era of high-performance blowers, turbochargers, and multiple nitrous shots, the advantage…

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Transmission Specialties, Inc
3 weeks ago
Transmission Specialties, Inc

🚨 Operational Update! 🚨

We're excited to announce that over the last several months, we've transitioned to a brand-new location in Charlotte, NC. Our state-of-the-art production line and top-tier production team are ready to serve you.

As part of this transition, we’re rebuilding our customer service team to ensure your calls and emails are answered promptly and professionally. If you tried to contact us during our move and experienced a delayed response, our apologies. Please contact us, we are ready to showcase the improved TSI.

Thank you for your support! See more at ➡ www.tsirace.com/
... See MoreSee Less

🚨 Operational Update! 🚨

Were excited to announce that over the last several months, weve transitioned to a brand-new location in Charlotte, NC. Our state-of-the-art production line and top-tier production team are ready to serve you.

As part of this transition, we’re rebuilding our customer service team to ensure your calls and emails are answered promptly and professionally. If you tried to contact us during our move and experienced a delayed response, our apologies. Please contact us, we are ready to showcase the improved TSI.

Thank you for your support! See more at ➡ https://www.tsirace.com/
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This sucks

Transmission Specialties, Inc
2 months ago
Transmission Specialties, Inc

Shift into savings this tax season with TSI starting today through Tax Day (4/15) where ALL PRODUCTS are 10% off at tsirace.com

Get the torque converter or transmission upgrade you've been needing while it's on sale!

#turbo400 #4l80e #powerglide #transmission #transmissionbuilder #raceready #racecar #dragracing #performanceparts #tsi #transmissionspecialties
... See MoreSee Less

Shift into savings this tax season with TSI starting today through Tax Day (4/15) where ALL PRODUCTS are 10% off at tsirace.com 

Get the torque converter or transmission upgrade youve been needing while its on sale!

#turbo400 #4l80e #powerglide #transmission #transmissionbuilder #raceready #racecar #dragracing #performanceparts #tsi #transmissionspecialtiesImage attachmentImage attachment+1Image attachment
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4 CommentsComment on Facebook

anybody know how long it takes them to ship? Ordered a case and tail shaft. They hit my card yesterday but then crickets, no communication and cant reach anyone on the phone, Mailbox full.

Have no trans brake or reverse working in my new 1500 hp box

Did a lot of business with you in the past with Kenny. Prices are outrageous since he left everything’s double. $1500 for a billet cover th400 converter that used to be $850?? Absolutely ridiculous I’ll take my business elsewhere

Transmission Specialties, Inc
3 months ago
Transmission Specialties, Inc

Race season is just around the corner and our shelves are stocked with the highest quality parts to get your build prepped for upcoming races and events! Input/output shafts, drums, planetaries, pumps, valve body parts, rebuild kits and much more all shipping daily at tsirace.com 🏁

Not sure what you need? Reach out and let one of our experienced techs help you +1 610-485-9110
... See MoreSee Less

Race season is just around the corner and our shelves are stocked with the highest quality parts to get your build prepped for upcoming races and events! Input/output shafts, drums, planetaries, pumps, valve body parts, rebuild kits and much more all shipping daily at tsirace.com 🏁

Not sure what you need? Reach out and let one of our experienced techs help you +1 610-485-9110Image attachmentImage attachment+1Image attachment
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Answer the phone

Transmission Specialties, Inc
3 months ago
Transmission Specialties, Inc

Another day of our CNC machines running full throttle in the shop. At the core of every torque converter and transmission build we do, you'll find only the best components—no shortcuts. When it comes to perfection, we don’t hesitate to make the parts ourselves, in-house!

#tsi #transmissionspecialtiesinc #torqueconverter #transmission #cncmachined #custommade #usa
... See MoreSee Less

Another day of our CNC machines running full throttle in the shop. At the core of every torque converter and transmission build we do, youll find only the best components—no shortcuts. When it comes to perfection, we don’t hesitate to make the parts ourselves, in-house!

#tsi #transmissionspecialtiesinc #torqueconverter #transmission #cncmachined #custommade #usaImage attachmentImage attachment
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I can't even get through calling or emails returned.My converter has been sitting since 1/23/25. At least you are still in business I guess.

Transmission Specialties, Inc
3 months ago
Transmission Specialties, Inc

Building precision-engineered torque converters tailored to your specific needs has helped us build our name. As the innovators of the spragless converter, we use advanced engineering and manufacturing to optimize power transfer and efficiency. From single-disc street converters to triple-disc lock-up race converters, our designs deliver reliability and performance for any application. Find the converter you need at TSIrace.com

#torqueconverter #transmission #tsi #transmissionspecialties
... See MoreSee Less

Building precision-engineered torque converters tailored to your specific needs has helped us build our name. As the innovators of the spragless converter, we use advanced engineering and manufacturing to optimize power transfer and efficiency. From single-disc street converters to triple-disc lock-up race converters, our designs deliver reliability and performance for any application. Find the converter you need at TSIrace.com

#torqueconverter #transmission #tsi #transmissionspecialtiesImage attachmentImage attachment
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Any of your techs on here to question one of your t400s

Has 3.......

TSI went out of business?

Transmission Specialties, Inc
3 months ago
Transmission Specialties, Inc

Another race ready 1,600hp powerglide for our friends down under at No Prep Performance 🇦🇺 💨 Built to launch hard and hold strong, thanks to our upgraded input and main shafts machined from Aermet 100 material—delivering the extra strength needed to get off the line in a hurry! ... See MoreSee Less

Another race ready 1,600hp powerglide for our friends down under at No Prep Performance 🇦🇺 💨 Built to launch hard and hold strong, thanks to our upgraded input and main shafts machined from Aermet 100 material—delivering the extra strength needed to get off the line in a hurry!Image attachment
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The best 200-4R I ever had was from you guys. I wish you still built them.

Pm me Tsi

Transmission Specialties, Inc
4 months ago
Transmission Specialties, Inc

Another busy morning at the shop! Over the weekend, we’ve had a steady flow of converter rebuilds and repairs rolling in. Remember, we’re not just about building brand-new converters—we’re here to handle repairs, fine-tune stall adjustments, and get your converter performing at its best. Let us help keep you running strong!

Reach out to us at 610-485-9110 or [email protected] to get your converter repair/rebuild in the queue.
... See MoreSee Less

Another busy morning at the shop! Over the weekend, we’ve had a steady flow of converter rebuilds and repairs rolling in. Remember, we’re not just about building brand-new converters—we’re here to handle repairs, fine-tune stall adjustments, and get your converter performing at its best. Let us help keep you running strong!

Reach out to us at 610-485-9110 or info@tsirace.com to get your converter repair/rebuild in the queue.Image attachmentImage attachment+1Image attachment
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Transmission Specialties, Inc
4 months ago
Transmission Specialties, Inc

Another one of our billet Powerglide transbrake valve bodies ready for shipment. This unit is one of our proprietary TSI-designed and engineered products, built entirely from scratch with ZERO OEM stock parts—100% brand new. Backed by over 40 years of continuous improvements and countless wins, this valve body is a proven performer on and off the track.

Check out all the specs at tsirace.com or give us a call at 610-485-9110
... See MoreSee Less

Another one of our billet Powerglide transbrake valve bodies ready for shipment. This unit is one of our proprietary TSI-designed and engineered products, built entirely from scratch with ZERO OEM stock parts—100% brand new. Backed by over 40 years of continuous improvements and countless wins, this valve body is a proven performer on and off the track. 

Check out all the specs at tsirace.com or give us a call at 610-485-9110Image attachmentImage attachment
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They work well in a turbo PG Barra application

Transmission Specialties, Inc
4 months ago
Transmission Specialties, Inc

Kicking off 2025 with a custom-built Powerglide for a customer in need of a fresh unit. 💪 Precision, reliability, and ready to perform on and off the track! #powerglide #transmission #transmissionbuilder #raceready #racecar #dragracing #performanceparts #tsi #transmissionspecialties ... See MoreSee Less

Kicking off 2025 with a custom-built Powerglide for a customer in need of a fresh unit. 💪 Precision, reliability, and ready to perform on and off the track!  #powerglide #transmission #transmissionbuilder #raceready #racecar #dragracing #performanceparts #tsi #transmissionspecialtiesImage attachmentImage attachment+1Image attachment
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Transmission Specialties, Inc
5 months ago
Transmission Specialties, Inc

If you're pushing 2000HP and beyond through your Turbo 400, a standard 2.48:1 gearset often falls short. That’s where the 2.10 Turbo 400 Gearset comes in—a purpose-built solution for high-horsepower vehicles that demand better traction and performance off the line ➡ www.tsirace.com/product/transmission-parts/turbo-400-straight-cut-billet-2-10-gear-set/

Here's what sets it apart:

⚙ Optimized Traction: 2.10:1 first gear reduces wheel spin and improves 60' times.
⚙ Versatile Power Delivery: Optional 1.40:1 second gear launch for turbo builds with extreme horsepower.
⚙ Built for Durability: Billet aluminum and 8620 forged steel construction with high-performance bushings and Torrington bearings.
⚙ Perfect for high-powered launches and smooth performance on the track.

It's time to upgrade ➡⏰

#turbo400 #TH400 #streetoutlaws #streetcar #dragcar #transmission #noprepracing #chevrolet #NHRA #bigtire #turbols #transbrake #racing #turbocar
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If youre pushing 2000HP and beyond through your Turbo 400, a standard 2.48:1 gearset often falls short. That’s where the 2.10 Turbo 400 Gearset comes in—a purpose-built solution for high-horsepower vehicles that demand better traction and performance off the line ➡ https://www.tsirace.com/product/transmission-parts/turbo-400-straight-cut-billet-2-10-gear-set/

Heres what sets it apart:

⚙ Optimized Traction: 2.10:1 first gear reduces wheel spin and improves 60 times.
⚙ Versatile Power Delivery: Optional 1.40:1 second gear launch for turbo builds with extreme horsepower.
⚙ Built for Durability: Billet aluminum and 8620 forged steel construction with high-performance bushings and Torrington bearings.
⚙ Perfect for high-powered launches and smooth performance on the track. 

Its time to upgrade ➡⏰

#turbo400 #TH400 #streetoutlaws #streetcar #dragcar #transmission #noprepracing #chevrolet #NHRA #bigtire #turbols #transbrake #racing #turbocarImage attachmentImage attachment+1Image attachment
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Transmission Specialties, Inc
5 months ago
Transmission Specialties, Inc

TSI is here at PRI 💪 Come to booth 925 to get up close and personal with some of our best performing products. ... See MoreSee Less

TSI is here at PRI 💪 Come to booth 925 to get up close and personal with some of our best performing products.Image attachmentImage attachment+3Image attachment
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Transmission Specialties, Inc
5 months ago
Transmission Specialties, Inc

Are you coming to the #PRI show? Come see us at booth 925 tomorrow through Saturday for all our latest in transmission performance and ask about our show special!

#prishow #tsi #transmissionspecialties
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Are you coming to the #PRI show? Come see us at booth 925 tomorrow through Saturday for all our latest in transmission performance and ask about our show special! 

#PRIshow #TSI #TransmissionSpecialties
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Transmission Specialties, Inc
5 months ago
Transmission Specialties, Inc

We've been putting in work to get your transmissions and torque converters out the door! This is the FINAL weekend to save during our extended sale at TSIrace.com. 5% + Free shipping + Free swag. Get your orders in before the holidays sneak up on you.

#transmissionspecialties #tsirace #powerglide #th400 #4l80e #torqueconverters
... See MoreSee Less

Weve been putting in work to get your transmissions and torque converters out the door! This is the FINAL weekend to save during our extended sale at TSIrace.com. 5% + Free shipping + Free swag. Get your orders in before the holidays sneak up on you.

#transmissionspecialties #tsirace #powerglide #th400 #4l80e #torqueconvertersImage attachmentImage attachment
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Good stuff

Transmission Specialties, Inc
5 months ago
Transmission Specialties, Inc

Don't forget! It's officially Black Friday and you can save 5% + Free Shipping at TSIrace.com

#transmissionspecialties #torqueconverter #powerglide #th400 #4l80e
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Dont forget! Its officially Black Friday and you can save 5% + Free Shipping at TSIrace.com

#transmissionspecialties #torqueconverter #powerglide #th400 #4l80eImage attachment
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Transmission Specialties, Inc
6 months ago
Transmission Specialties, Inc

Happy Thanksgiving from our family to yours! A big shoutout to our team and customers this Thanksgiving. We couldn’t do what we do without you. Enjoy the holiday, and thank you for being part of the TSI journey 🏁 ... See MoreSee Less

Happy Thanksgiving from our family to yours! A big shoutout to our team and customers this Thanksgiving. We couldn’t do what we do without you. Enjoy the holiday, and thank you for being part of the TSI journey 🏁
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Transmission Specialties, Inc
6 months ago
Transmission Specialties, Inc

Ready for that new transmission, torque converter, or anything else for your trans build? Now's the time, because Black Friday is LIVE! Save 5% on EVERYTHING sitewide at www.tsirace.com/ , plus get free shipping/freight. Those savings add up quick, especially on complete transmissions like our new 4L80E!

#transmission #torqueconverter #flexplate #4l80e #powerglide #turbo400 #tsi #tsirace #transmissionspecialties
... See MoreSee Less

Ready for that new transmission, torque converter, or anything else for your trans build? Nows the time, because Black Friday is LIVE! Save 5% on EVERYTHING sitewide at https://www.tsirace.com/ , plus get free shipping/freight. Those savings add up quick, especially on complete transmissions like our new 4L80E! 

#transmission #torqueconverter #flexplate #4l80e #powerglide #turbo400 #tsi #tsirace #transmissionspecialtiesImage attachmentImage attachment+2Image attachment
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  • Shop
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  • Resources
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