OVER 40 YEARS OF RACING TRANSMISSIONS
SHOP POPULAR TRANSMISSIONS AND COMPONENTS
POWERGLIDE TRANSMISSIONS
TH400 TRANSMISSIONS
TORQUE CONVERTERS
FLEX PLATES
CUSTOM TORQUE CONVERTER KITS
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.
ABOUT TSI
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.
TSI Operational Update
Dear TSI Customers, We’re excited to announce that over the last several months, we’ve t…
The Advantages of Upgrading to a TSI Converter
If 90% of converter failures stem from a slipping or broken sprag, why include one in a racing conve…
The Truth About Spragless Converters For Racing
In today’s era of high-performance blowers, turbochargers, and multiple nitrous shots, the advantage…
CONNECT WITH US
🚨 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/
1 CommentComment on Facebook
This sucks
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
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
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
1 CommentComment on Facebook
Answer the phone
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
1 CommentComment on Facebook
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.
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
3 CommentsComment on Facebook
Any of your techs on here to question one of your t400s
Has 3.......
TSI went out of business?
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!
3 CommentsComment on Facebook
The best 200-4R I ever had was from you guys. I wish you still built them.
Pm me Tsi
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.
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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
1 CommentComment on Facebook
They work well in a turbo PG Barra application
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
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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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TSI is here at PRI 💪 Come to booth 925 to get up close and personal with some of our best performing products.
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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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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
1 CommentComment on Facebook
Good stuff
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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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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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
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