![]() ![]() My buddies say I'm nuts for even considering a TH350, but I believe that it will work. The rear gears are 3.70s with a Trac-Loc turning a 29" tall tire. I'm keeping the compression around 9.5-1, using -781 oval ports with 2.19/188 valves and a bowl blend and port match, a healthy solid cam, single plane manifold, 850 Holley. ![]() I had no idea that there was SIX inches of difference between the mounting locations on a TH350 and a TH400. ![]() I tried to mock up a TH400, but what I have now will not work without essentially re-doing the X-member. It is widely considered to be one of the greatest of automatic transmissions ever built. The Turbo 350 is an automatic shift, three-speed transmission. The GMC Turbo Hydra-Matic 350, famous as Turbo 350, first appeared in 1969 to replace the GM’s two-speed Powerglide transmission. When I built the tubular X-member underneath, I incorporated a tubular drop-out trans mount in the forward part of the X that was specifically dimensioned for the TH350. We have many Turbo 350 parts to choose from, click the buttons above to filter your search. The TH350 is a 3-speed transmission with a higher 1st gear ratio (2.52:1) and a provisional 2nd gear, facilitating enhanced initial momentum for drag racing and everyday driving. In comparison, the Turbo 350 is more suitable for lighter duty applications like small blocks or even V6s. The Turbo 400 was designed to live behind higher-torque applications such as big-block engines. I'm building a Pro Street '55 Chevy truck ('70 Camaro clip, fully boxed frame, narrowed 9-inch) that was originally slated to get the 406, but I had a change of plans and have decided to go with a 468 instead. Usually, the Turbo 350 and Turbo 400 are two distinct transmissions, with the latter being larger, longer, and heavier than its predecessor. Tailshaft Dyno Tested 450HP Brand New 1,900.00 transpartsdirect (4,807) 98.9 Buy It Now Free shipping 59 sold Sponsored Stainless Flexible Transmission Dipstick For Chevy GM TH400 TH350 Turbo SBC BBC Brand New 14.99 autopartszone-usa (1,134) 98. The transmission would be modified so that the transmissions behind the stronger engines were able to handle the additional torque. I was checking out Jakeshoe's excellent sticky on rebuilding a Th350, and was wondering how much power a well-built TH350 with the correct parts would withstand. Turbo 350 Chevy Performance Transmission Short 6 in. Turbo 350 Performance Specs The maximum torque that this transmission could handle varied depending on the application to which it was being applied. ![]()
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