It's easy to restore and extend vehicle shift quality with Zip Kits. Uniquely designed Sonnax parts target the root cause of valve body complaints and stop critical circuit pressure losses in the most common problem areas of the transmission.
No Special Tools Required
Tackles the Big Picture of Shift Problems
Detailed Tech Booklet
Looking for single, drop-in valve components?Browse all Zip Valve™ parts.
See what people are saying about Sonnax Zip Kits:
The most helpful product to date are your Zip Kits. Your Zip Kits hit the valve body issues right on the head. Thank you very much for this product.J. Tokar
Over the years of using Sonnax I have come to really appreciate the continual good work Sonnax puts into our industry and their products. The Zip Kit is my favorite product.W. Swanson
I installed our first Zip Kit on a U140F, nice kit and additional information. What was really nice: to have at your fingertips the vacuum testing locations and the effects of the wear in that bore. Without this information I might not have vacuum tested and missed this problem. Nice kit, Sonnax.K. Mumie
We had a 2008 Range Rover diesel 157,500km with drivability issues. We stripped the v/b and fitted all components from Zip Kit, reinstalled v/b, new ATF and new filter, then road tested the vehicle home. Well done, boys, this Range Rover drives 100%. I didn't even reset the adaptation, it drives real good.S. O'Connor
A & M Gearbox Centre