Peace of mind for everyday customers pushing vehicles to the limit
Sonnax booster kit components are uniquely designed for precision pressure control. At low-end pressures, they deliver normal engagements, normal light throttle shifts and smooth coastdown shifts. When vehicles are pushed harder, components progressively increase pressure for improved clutch holding capacity and increased durability.
Simple, effective parts install with no special tools required
Ideal for heavy duty and modified vehicles as well as hard-working daily drivers
Improved shift feel and durability for fewer comebacks and complaints
See what people are saying about Sonnax Line Pressure Booster Kits:
We used the 4T65E-LB1 in several applications...it doesn't give harsh shifts, just a little something extra. Very nice product and I highly recommend it."
D. Tucker Tucker's Transmission Pine Bluff, AZ
Use the Sonnax 4L60E-LB1 progressive boost valve...it will put a smile on your customer's face.
D. Stewart Dan's Service Center Cliff, NM
I just received my line pressure booster for my 2012 Ram and wow! The CPU gets the new pressure signal very fast...30 seconds of slow-medium driving...and when I floor it....yihaaa! It shifts aggressively and I can feel the tranny grab the clutches with more power when it changes gear...great product! Thumbs up!!!
J. Martel Senneterre, Québec, Canada
Check out these other great Sonnax transmission kits: