That factory 4L70E in the TBSS already has the 5 pinion planets, hardened input shaft, hardened output shaft, and hardened stator support. All it needs for aftermarket parts is a double cage forward sprag, beast sun shell, the input drum reinforcement sleeve, 7 plate Raybestos Blue Plate 3-4 clutch pack, and the Transgo HD2 shift kit. With a Carbonite 2-4 band, the factory Corvette servo equipped with some aftermarket d-ring rubber seals has enough force to hold 2nd gear without resorting to those $120 aftermarket servos.
The above mods to a 4L65/70 will readily survive 700 horsepower, assuming the factory line pressure cutback in 2nd gear on up is taken out of the tune.
If nothing is broke or worn out in your current 4L65/70 trans yet, total cost for the above improvements should be ~$1000-$1200 bench cost using your existing trans.
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ÔÇ£If you carry a gun, people will call you paranoid. ThatÔÇÖs ridiculous. If I have a gun, what in the hell do I have to be paranoid about?ÔÇØ -Clint Smith, Thunder Ranch.
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