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Sonnax Performance Pack HP-4L80E-01 upgrades GM 4L80-E and 4L85-E transmissions for maximum performance and durability in work/sport vehicles. Innovative component...Read More
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Sonnax hydraulic line pressure booster kits contain stronger pressure regulator springs and large ratio boost valves designed to work together to provide progressi...Read More
Sonnax Sure Cure kit SC-4L80E, fully compatible with '91-later GM 4L80-E and 4L85-E units, is a comprehensive reconditioning package featuring the best Sonnax prod...Read More
Sonnax case saver retainer 34762-10 for the GM TH400 and '98-earlier 4L80-E is the only intermediate clutch retaining ring case saver that allows the intermediate ...Read More
In GM 4L80-E and 4L85-E transmissions, the accumulator control valve controls shift firmness by managing accumulator back pressure. Wear at the valve or bore can l...Read More
Sonnax case saver retainer 34762-20 for '99-later GM 4L80-E and 4L85-E transmissions is the only intermediate clutch retaining ring case saver that allows the inte...Read More
Sonnax low/reverse servo spacer kit 34528-01K is a simple, low-cost way to add durability to the GM 4L80-E and 4L85-E transmissions and eliminates the need to retr...Read More
The OE pressure regulator valve design prevents adequate cooler flow at low RPM and high pressure/demand conditions, which can create overheating. Additionally, in...Read More
Insufficient holding power in the Overdrive roller clutch is the underlying cause of chronic Overdrive roller clutch failure in hardworking 4L80-E and 4L85-E trans...Read More
’97–’03
’04-Later
Input shaft failure is a common problem in performance GM 4L80-E and 4L85-E transmissions running with extreme horsepower. OE and aftermarket shafts simply don’t h...Read More
Sonnax adjustable low/reverse servo pin kit 34912-01K replaces GM TH400 and '95-earlier 4L80-E servo pins. OE pins have seven different lengths to allow for adjust...Read More
A worn valve or valve body bore can result in incorrect pressures in the transmission, which may lead to poor performance or failure of the transmission. With the ...Read More
’92–’96, Temperature Sensor in Wire Harness
Sonnax offers the GM 4L80-E thicker cross section, 6-stud lockup front cover GM-CC-11. The strength of this cover is improved by using a one-piece forging with inc...Read More
Improve GM 4L80-E, 4L85-E and TH400 transmission durability with Sonnax heavy duty intermediate clutch outer sprag race 34663HD-02. It’s an ideal upgrade for perfo...Read More
Rubber separators can be used in GM TH400 and 4L80-E racing transmission to help keep clutch steels separated and reduce open clutch drag when the clutch is diseng...Read More
GM ’98-earlier 4L80-E transmissions can suffer intermediate backing plate breakage, clutch failure and case lug blow out when pressures are increased for more clut...Read More
GM '99-later 4L80-E and 4L85-E transmissions can suffer intermediate backing plate breakage, clutch failure and case lug blow out when pressures are increased for ...Read More
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 th...Read More
Ideal for GM 4L80-E and 4L85-E custom transmission builds and performance applications, Sonnax shift lever kit 38512-03K makes it easy to install a short-length ma...Read More
Hardened internal spline
Designed for GM 4L80-E and 4L85-E racing transmissions, Sonnax externally adjustable low/reverse servo kit 34914-28K makes band maintenance quick and easy. It’s an...Read More
Sonnax heavy duty forward clutch hub 34322-01 is an ideal upgrade over OE hubs in GM TH400, TH425, 4L80-E and 4L85-E applications. It is made from 1045 steel forg...Read More
Sonnax vacuum test plate kit seal 34994-VTP-S is a replacement silicone seal for a worn or damaged original seal in vacuum test plate kit 34994-VTP.
