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4l80e transmission11/27/2023 Many people have bought GM crate 4l85e's for the 06-07 duramax van, and put them into 94+ with no issues other than hooking up the cooler lines(they can be swapped into the earlier 91-93 with some mods as well). It was the 4l60e that seen so many changes through the years and keeps you on your toes, not the 4l80e. So 94+ 4l80e and 4l85e's all work identical electrically, and you can quickly make a 91-93 work with a later controller by changing the pressure solenoid to later style. Sometime in the 21st century GM changed suppliers for the pressure control solenoid again, but it still works the same way. Due to this cleaning cycle, there was a damper circuit built in to slow line pressure changes so the cleaning cycle didn't cause issues with pressure spikes. To do this, a total of four 4L80E solenoids are used, including a PWM TCC solenoid. However, the 4L80E never featured a removable bellhousing, unlike the 4L60E automatic transmission. The 4L80E features a die-cast aluminum case, just like most other GM automatics. But in this more modern application, the 4L80E valve body has 4 forward gears to control. The 4L80E transmission features a large 32 spline output shaft much like the TH400 transmission in the numerous 2WD and 4WD applications. In 94 they changed to a solenoid that didn't require it. The 4L80E transmission is the advanced progeny of the legendary TurboHydramatic TH400 automatic transmission, and is based heavily on the 400 in both parts. The 4L80E transmission is a direct descendent of the heavy duty TH400 3-speed automatic transmission. Automatic Transmission Rebuild Kit, Gaskets, Seals, Band, Clutches, Filter, Chevy, 4L80E, 35-spline Input, Kit. 91-93 4l80e's used a different pressure control solenoid that required a clean8ng cycle every 10 seconds where the solenoid was stroked from full open to full closed and back to normal operation. These automatic transmission rebuild kits will take the guesswork out of your auto transmission repair or rebuild by supplying all the small pieces and parts in one convenient kit. Parts include a McLeod performance rebuild. The plan was simple: Take a 2003 4L80E and rebuild it, upgrading the common failure points. ![]() The control system is the same for all 4l80e's with 1 exception. We rebuilt a junkyard 4L80E to handle 1,000 hpfor 1,000.
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