We love 2-speed TH400 transmissions here at Hughes Performance!! That is why we are excited to announce our all new part number HP2205 Do-It-Yourself Extreme Duty 2-speed TH400 transmission conversion kit!!

This kit comes with all the hard parts necessary for the experienced professional to convert their very own 3-speed TH400 to a 2-speed high horsepower drag racing transmission!

We rate kit HP2205 for up to 2,000 flywheel horsepower when used with good condition GM planetary gear sets, which will provide a 1.48:1 low gear ratio when kit HP2205 is installed. This kit can handle even higher power levels when coupled with one of our premium billet TH400 gear sets!! These components have been proven deep into the 4-second 1/8-mile E.T. range in our own in-house built Extreme Duty TH400 2-speed transmissions!!

Each HP2205 kit includes the following premium high-strength components:

  • (1) x HP2215X2 2-speed billet aluminum Pro Tree transbrake valve body with Powerglide shift pattern (P-R-N-2-1)… this transbrake will cut a .000 light!!
  • (1) x HP2226 nitride-treated 4140 forged steel forward clutch hub with roller bearings
  • (1) x HP2233 H-11 billet tool steel intermediate shaft
  • (1) x HP2234A hard anodized billet aluminum direct drum with steel bore for sealing rings, Pro Mod 36-element intermediate sprag, and heat treated steel sprag races
  • (1) x HP2236M 300M billet solid steel 30-spline input shaft with GM forward drum broached for oversize input drum spline
  • (1) x HP2260 billet aluminum intermediate clutch pack eliminator insert