B&M CO TRANSPAK TH400 65-87 Auto Trans Shift Enhancer – 20228

TH400 Transpak


Part Number 20228
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Auto Trans Shift Enhancer; Transpak; TH-400/375/M40; Heavy Duty Or Street/Strip Mode; With Gaskets

The next step up from the Shift Improver Kit is the Transpak. It has all the features in the Shift Improver Kit plus it provides additional driver manual control (GM TH-400, 350, Ford C-6 & Chrysler Torqueflite only). Most stock automatic transmissions won’t downshift into low gear above 15 Miles Per Hour, & automatically upshift at a predetermined speed no matter what gear you’re in. With the Transpak, you can downshift at any speed, & you can hold the transmission in first gear to any speed that you want! This is an asset when you’ve got a modified engine, & you want additional RPMs, or you’re towing a trailer or driving heavy loads downhill. Stage 1 Heavy Duty – For street rods, normal passenger vehicles or other heavy duty use. Firmer shift feel but not harsh. Improves transmission performance & life dramatically without loss of comfort. Normal automatic operation when in “Drive”. Stage 2 Hi-Performance Street – For full performance street use. Essentially the same as Heavy Duty mode except shift is much quicker. Retain full automatic features & standard shift points with selector in “Drive”.

Compatibility: TH400/375/M40 Transmission
Performance Type: Heavy Duty Or Street/Strip Mode
Includes Filter: No
Includes Gaskets: Yes

– Recalibrate Your Automatic Transmission For Optimum Performance & Extended Life
– Select The Mode That Best Suits Your Application
– Transmission Removal Not Required
– Improves Transmission Life
– Limited 1 Year Warranty


Weight 1.15500 kg
Dimensions 11.50000 × 10.40000 × 2.10000 cm

Part Number