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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 mph, and automatically upshift at a predetermined speed no matter what gear you're in. With the Transpak, you can downshift at any speed, and 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, and 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 and 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 and standard shift points with selector in "Drive".

  • Recalibrate your automatic transmission for optimum performance.
  • Select the mode that best suits your application.
  • Improves transmission life.
  • Transmission removal not required.
Part# Chevrolet, Buick, Olds, Pontiac, GMC Price
20228 '65-'87 TH-400, 375 and M40
30228 '68-'81 TH-350, 375B and M38
30235 '80-'86 TH-350C
70235 '82-'93 TH-700R4 (4L60)


70365 '93-'01 4L60E
Part# Ford Lincoln Mercury Price
40228 '67-'91 C6
50229 '70-'82 C4
Part# Chrysler, Dodge, Plymouth Price
10228 '66-'77 TF A-727 and TF A-904
10227 1978 to 1996 Chrysler, Dodge, Plymouth Torqueflite 727, 518, 46RH & 47RH, and Torqueflite A904, 999, 32RH, 42RH & 500 $91.50
Please Note: Not all products are in stock at RaceTrans and will need to be ordered from B&M. Please allow for extra shipping time. Prices Subject to change

Prices Subject to change and do not include shipping