- Transmission & Drivetrain
- Shift Kits
- JW Performance Transmission Shift Improver Kits
Increase the Performance of Your Transmission
These shift improver kits increase the performance of automatic Powerglide/TH350/TH400 transmissions. They are cost effective and include necessary valve body plates, as well as gaskets and complete instructions. Available in your choice of Street/Strip and Heavy Duty kits.
Street/Strip: For hot rod applications - substantially increases line pressure, and removes the delay out of the shift. Heavy Duty: For towing or RV applications - removes the delay out of the shift and not quite as harsh as the street/strip version.
Filter Results
AVAILABILITY
PART TYPE
PART TYPE
BRAND
BRAND
RATING
Part Category
Vendor Part Number
Part Fitment
PRICE
Powerglide
$51.44
Estimated to ship direct from manufacturer on 09/23/24, pending manufacturer availability.
Lowest Price Guarantee
$51.44
Estimated to ship direct from manufacturer on 09/23/24, pending manufacturer availability.
Lowest Price Guarantee
TH350
$67.35
Estimated to ship direct from manufacturer on 09/23/24, pending manufacturer availability.
Lowest Price Guarantee
$67.35
Estimated to ship direct from manufacturer on 09/23/24, pending manufacturer availability.
Lowest Price Guarantee
$67.35
Estimated to ship direct from manufacturer on 09/23/24, pending manufacturer availability.
Lowest Price Guarantee
$67.35
Estimated to ship direct from manufacturer on 09/23/24, pending manufacturer availability.
Lowest Price Guarantee
TH400
$67.35
Estimated to ship direct from manufacturer on 09/23/24, pending manufacturer availability.
Lowest Price Guarantee
$67.35
Estimated to ship direct from manufacturer on 09/23/24, pending manufacturer availability.
Lowest Price Guarantee
$67.35
Estimated to ship direct from manufacturer on 09/23/24, pending manufacturer availability.
Lowest Price Guarantee
$67.35
Estimated to ship direct from manufacturer on 09/23/24, pending manufacturer availability.
Lowest Price Guarantee