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Early GM 300mm units used both dark and silver rivets. The silver rivets have been known to fail and can now be replaced with Sonnax general purpose rivets GM-RV-9.
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Sonnax checkballs 10000-08 (.250") are made out of tough, wear-resistant imidized plastic. The Sonnax imidized plastic balls seal better than steel balls because t...Read More
Tool Kit for 56947J-80K, 56947J-81K and 56947J-82K.
Tool Kit for 95740-80K
It is common for one of the three plastic retention tabs to break on the wiring harness case pass-through connector in GM 4L80-E and 4L85-E units. This allows the ...Read More
Sonnax manual shift shaft kit 38511-03K for the GM 4L80-E is an early model ’91–’94 manual shift shaft that retrofits to a late-model ’95-later manual shaft detent...Read More
Transmission cases made in 1994 and 1995 have neutral safety switch mounting holes but do not have the top mount shifter bracket holes. Sonnax shift cable mount br...Read More
OE cast aluminum servo pistons can be brittle and are prone to breaking. Sonnax heavy duty low/reverse servo piston 34914-01 for GM TH400 and '95-earlier 4L80-E tr...Read More
Sonnax offers a genuine AC Delco pressure switch manifold for the 4L80-E unit.
GM 4L80-E and 4L85-E forward drums are often replaced due to wear of the sealing ring bore caused by contact with the input shaft. Contact between shaft and drum o...Read More
Manual shift shafts in GM 4L80-E can become corroded in harsh environments. Corroded manual shift shafts are not suitable for reuse, especially in remanufacturing....Read More
34821-01 is a direct replacement for the planetary thrust bearing in listed units. This bearing is known to fail and destroy the planet gears. Replace the bearing ...Read More
Sonnax conversion spacer GMBW-WS-40 and outer stator race GM-R-15 are used with the GM 300mm outer stator race, springs and rollers for a cost-effective upgrade to...Read More
OE end plugs are designed to prevent critical pressure loss by capping the bore, while also functioning as a valve stop. Repetitive spring motion, valve impact and...Read More
Vehicles with '95-later GM 4L80-E and 4L85-E transmissions commonly exhibit wear in the Reverse checkball sleeve located in the 3-4 shift valve bore. This issue is...Read More
GM 4L80-E and 4L85-E units may display no converter lockup or codes 68, 39, 1870 or P0741. Imbalance of torque converter clutch apply oil through the front stator ...Read More
Manual shift shafts in GM 4L80-E and 4L85-E models can become corroded in harsh environments. Corroded manual shift shafts are not suitable for reuse, especially i...Read More
Wear at the direct clutch drum bore in GM TH400, 4L80-E and 4L85-E transmissions allows 3rd and Reverse apply oil to exhaust. This oil leakage can result in direct...Read More
GM 4L80-E and 4L85-E transmissions may have 2nd gear starts and no upshifts, which can be accompanied by trouble codes 68, 85, 86 and/or 87. These problems can oft...Read More