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Automatic 3-Speed TH 400 4″ Tailhousing. Replaces 4″ tailhousing. Small block and Big block cars.
- GM 2-3 Speed Auto
This is also why all GM Callaway Twin Turbo Corvettes with...
- GM 2-3 Speed Auto
This is also why all GM Callaway Twin Turbo Corvettes with automatics came with a TH400 and GEAR VENDORS instead of the 700r4 which was the base Corvette trans. You are also going to actually make more horsepower and enjoy overdrive cruising better with a GEAR VENDORS .
Gear Vendors TH400 Under/Overdrive With 4" Tailhousing. Give your transmission up to twice the forward gear ratios with the UNDER/OVERDRIVE auxiliary transmission from Gear Vendors. This supplemental planetary gearbox adapts to the output shaft of your existing transmission to provide an extra gear of 0.78 :1.
16 maj 2021 · Did find "Gear Vendors" that offers a bolt-on adaptor to a TH400 to add the 4th gear. Any experience with this approach?
29 lis 2018 · I have one on my Monte...502ci, TH400, Gear Vendors, and finally a 12 bolt with a Eaton Posi with 4.11 gears. What gears are you running?
19 lut 2000 · Gear Vendors makes a very good overdriive unit for about all popular transmissions. They sell for about $2500 I think. They are supose to be fairly easy to install.
6 wrz 2016 · Gear Vendors is an aftermarket, bolt on overdrive for the TH400 (and many others). Not the least expensive route but seems to be very dependable and strong. You should have plenty of room for this without any cutting also.
