Description
4L80E / 4L85E #7 Low/Reverse Checkball Seat, Sonnax 34200-52.
Fits ’95-later units.
Package Quantity: 5
Vehicles with GM 4L80-E and 4L85-E transmissions commonly exhibit wear in the #7 Low/Reverse checkball seat location. This issue is caused by normal movement of the checkball and slight movement of the seat within the bore over time. As wear progresses, sealing function of the checkball seat becomes compromised and results in loss of rear band apply (RBA) pressure. This can result in a burnt rear band, delayed or no Reverse and loss of engine braking in manual low.
Installing Sonnax # 34200-52 4L80E 4L85E Checkball Seat restores the hydraulic integrity of this circuit to re-establish normal pressure and performance.
- Replaces worn checkball seat to correct loss of RBA apply pressure
- Checkball seal made from high-strength, wear-resistant aluminum for added durability
- Drop-in Zip Valve™ parts install quickly and easily
