Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Drive Chain and Sprockets
A chain drive transfers torque from the torque converter turbine to the planetary gearsets. The chain drive is composed of the following components:
- Reverse/overdrive ring gear assembly which acts as a drive sprocket
- Driven sprocket
- Drive chain
The drive chain connects the reverse/overdrive sun gear with the driven sprocket. The final drive sun gear located on top of the driven sprocket meshes with the final drive gearset.
The final drive consists of a planetary gearset that transfers and multiplies torque from the planetary gearsets to the differential. The final drive consists of the following components:
- Final drive sun gear: is chain driven by the reverse/overdrive ring gear assembly and transfers torque to the final drive carrier.
- Final drive carrier: the final drive carrier acts as the driven member and is part of the differential case.
- Final drive ring gear: is held by the converter housing and is always the held member of the final drive planetary gearset.
| Item | Part Number | Description |
|---|---|---|
| 1 | 4204 | Differential case (with final drive carrier) |
| 2 | 7F453 | Ring gear - final drive |
| 3 | 4211 | Pinion shaft - differential |
| 4 | 4230 | Pinion thrust washers - differential |
| 5 | 4228 | Side gear thrust washers - differential |
| 6 | 4236 | Side gears - differential |
| 7 | 4215 | Pinion gears - differential |
The differential assembly drives the differential pinion gears and the differential side gears, which in turn, drive the front wheel driveshaft and joints and provides differential action if driving wheels are turning at different speeds. The differential assembly consists of the following components:
- Differential case (part of the final drive carrier)
- Two pinion gears supported by a pinion shaft
- Two side gears supported by the differential case and halfshafts
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.