Transmission Specialties, Inc

07/05/2026

The 4L80E your momma warned you about. 😈

Our Stage 3 4L80E Transmission Kit is built to handle 1,000 horsepower without breaking a sweat. No compromises. No shortcuts. Just proven performance for racers who demand more from every pass.

🔥 In stock and ready to ship.
🇺🇸 Save 10% OFF this 4th of July weekend.

Because the only thing better than the baddest automatic transmission you can buy... is getting it on sale.

Only at tsirace.com.

07/04/2026

🇺🇸 The fireworks aren't the only thing bringing the heat this 4th of July.

For a limited time, get 10% OFF all TSI products, including our best-selling Stage 2 and Stage 3 4L80E transmissions.

That means you can save more than $350 on one of the toughest 4L80E packages on the market. If you've been waiting to pull the trigger, don't miss this sales event.

Shop the sale now at tsirace.com.

07/03/2026

Help your ride get off the line quicker and down the track faster with our transmission and torque converter kits.

4L80E, Powerglide, Turbo 400. You name it, we can build it to meet your performance demands. Don't forget about getting the converter upgrade that is just as important to your timeslip as the trans going in it.

Your one stop shop to making your ride faster and shifting smoother, 10% off during our 4th of July sale only at tsirace.com 🏁

07/02/2026

Build your next TH400 the right way. 💪

Our SFI-certified TH400 transmission case is engineered to eliminate the weak points of a stock case while providing the strength and durability serious race cars demand.

✔️ Cast from high-strength 356-T6 aluminum
✔️ Two-piece case construction
✔️ Eliminates common stock case failure points
✔️ SFI-certified and track ready

🇺🇸 Save 10% during our 4th of July Sale, only at tsirace.com

07/01/2026

Trusted by engine builders. Proven by racers. 💪

From our complete 1,200HP-rated Powerglide transmission kits to billet gear sets for Turbo 350/400 builds, every component is engineered to handle serious horsepower and deliver race-winning reliability.

🇺🇸 Celebrate the 4th of July with 10% OFF all parts and transmission kits for a limited time.

Upgrade your drivetrain and save today. only at tsirace.com.

06/26/2026

250 Years 🫡🇺🇸 We're starting the party NOW with our July 4th Sale💥
🔴 10% off all TSI parts
⚪ No code needed
🔵 Live Now - Shop at https://www.tsirace.com/

06/25/2026

06/19/2026

Want to drop in a complete, ready-to-race transmission? ✅ We've got you covered.
Need bulletproof components to build your own? ✅ We've got you covered there, too.
TSIrace.com

05/27/2026

The TSI GM Powerglide Complete Racing Transmission (1100HP Stock Case) combines proven component selection with expanded customization options to better match your specific racing application.

Customers can now configure:
▪ Short or Long Tailhousing
▪ Street/Strip or Race Reverse Function
▪ 1.69 or 1.80 Planetary Gear Ratio
▪ Cut or Uncut Bellhousing

Each transmission is assembled using premium race-proven components including a 300M billet input shaft, 4340 billet output shaft, 8-clutch high-capacity direct drum, billet forward-pattern transbrake valve body, and deep aluminum transmission pan.

Please note: transmissions are sold without a converter, but a matching TSI custom stall racing torque converter can be added separately for a complete track-ready package.

Get 10% OFF at tsirace.com for a limited time only!