Shift Improver Kits
Chevrolet, Buick, Olds, Pontiac, GMC
Description
The B&M Shift Improver Kit the easiest way to get the stout performance you've always wanted out of your automatic transmission - and you get two modes of performance to select from: Heavy Duty, or Street/Strip. It's our least expensive and simplest to install kit. All you need are a few dollars and some hand tools! In the space of an afternoon, you can turn your transmission into a B&M-tuned unit! Just ask the thousands of satisified customers that have installed one in their transmissions!

Stage 1 - Heavy Duty
Firm positive shifts without loss of driver comfort for improved performance in all street vehicles. Recommended for regular passenger vehicles.

Stage 2 - Street/Strip
Provides very positive shifts for high performance street use or for competitive events. This model is for the enthusiast who wants the hardest, quickest possible shift.
Key Features
  • Provides crisp shifts on any stock automatic transmissions.
  • Elimination of soft sluggish shifts, shift overlap, and excess wear on clutches and bands due to slippage.
  • Improves transmission life.
  • Transmission removal not required.
Applications
20261 '88-'94 TH-400 (3L80)
20260 '65-'87 TH-400, 375 and M40
30262 '68-'81 TH-350, 375B and M38 (for TH-350C use Transpak #30235)
35265 '81-'90 TH-200-4R
70239 '82-'93 TH-700-R4/4L60
70360 '93-'01 4L60E
10024 '91-'02 4L80E