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Here’s a full teardown on what’s inside a 4x4 Jeep 8 speed automatic transmission and how it works!

The Jeep 850RE is an 8 speed automatic transmission used in the 2018+ Jeep Wrangler JL amongst other models. It features 5 clutch packs activated by pistons and 4 planetary gearsets to achieve 8 forward and 1 reverse gear ratio. It is longitudinally mounted for rear wheel drive, with the 4X4 transfer case attached to the rear of the transmission and a traditional torque converter and fluid pump at the front. It also features an external cooler and traditional shifter linkages for the parking pawl.

Inside, the transmission pan does not include a drain port, but has a serviceable filter. The valve body has 9 valves, in addition to an accumulator to help pressurize fluid once engine start-stop is engaged. Traditional planetary gearsets are employed. The casing is one piece, with the bell housing non-removable. There is an abundance of snap rings that are difficult to disengage upon disassembly.

Similar to other automatic transmissions, the 8 speed uses a combination of the planetary gearsets to achieve its ratios by turning on and off its clutch packs. The clutch packs are typically the wear point on all transmissions, in addition to failing solenoid valves and clogged lines. The exclusion of a dipstick and drain port ever so reinforces the fact that Chrysler does not have confidence in this vehicle’s longevity, although Jeep Wrangler enthusiasts will typically upkeep.

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