8HP70 Planetary, remanufactured and ready to install. Fits the 8HP70. Ships fast from the USA.
If your ZF 8HP70 has started to whine at cruise, lost one or more gears, or left a layer of glittering metal on the pan magnet, the geartrain is the first place to look. This remanufactured 8HP70 planetary assembly is for the heavier-duty member of the first-generation ZF 8-speed family, the unit found behind larger engines in rear-drive and all-wheel-drive cars, SUVs and trucks from BMW, Audi, Jaguar, Land Rover and the Chrysler group. Replacing the worn gear section with a rebuilt assembly saves you from sourcing pinions, shafts and bearings one at a time and hoping they all match.
The 8HP gets eight forward speeds and reverse out of only four planetary gearsets, two brakes (A and B) and three clutches (C, D and E). Each gear is made by holding three of those five shift elements at once, so every gearset carries load in several ranges instead of sitting idle the way a single set in an older four-speed might. That is why one tired gearset rarely stays quiet: worn pinion needle bearings, pitted pinion teeth or a chewed thrust washer load up in more than one gear, and the noise or slip follows the vehicle through the speed range.
The assembly pictured includes the output shaft and the surrounding drum and gear section, so you are replacing the rotating gear path as a unit rather than individual pinions. Compare it against your old part on the bench before installation; splines, shaft length and the number of teeth on the drum must match.
Be careful not to confuse these with the 8HP's more common hydraulic complaints. Harsh shifts, adaptation trouble and pressure loss from a leaking mechatronic sleeve, or a worn valve body bore, can feel like a geartrain problem but will not produce speed-related gear whine or ferrous debris.
Start with the fluid. Check the level the way ZF specifies, at the correct temperature with the engine running, because a low 8HP can slip and moan on its own. Then pull the pan and inspect the magnet and filter: fine gray paste is normal clutch and gear wear, while chips, flakes or needle rollers point straight at a planetary or bearing failure. Drive the vehicle at a steady speed in several gears and note whether the noise changes with road speed and stays the same in neutral coast. Our ZF8HP common problems and fixes guide covers how to separate mechanical noise from the hydraulic faults, and the 8HP shift problems diagnosis guide walks through the shift-element map if a single gear is missing.
This listing is for the 8HP70, part of the first-generation 8HP group (8HP45, 8HP55, 8HP70, 8HP90 and the Chrysler 845RE). It is not the same unit as the second-generation 8HP75, 8HP50 or 850RE, which differ internally, and it is not interchangeable with the lighter 8HP45 planetary. Because the 8HP70 was used across many brands with model-specific output shafts and housings, match the tag on your transmission case and the shaft and spline count on your old assembly, or send us the year and VIN and we will confirm it before shipping. You can browse every part we carry for this family on the ZF 8HP collection page.
| Fits | 8HP70 |
| Part type | Planetary |
| Condition | Remanufactured |
| Brand | OEM |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
No. The 8HP75 and 850RE are second-generation 8-speed units with different internals. This assembly is for the first-generation 8HP70 only. Check the identification tag on the side of the case before ordering.
A worn gearset typically whines with road speed in specific gears and leaves ferrous metal on the pan magnet. A differential or wheel bearing noise usually stays the same in every gear, including neutral coast. If you are unsure, send us your symptoms with the year and VIN and we can help narrow it down.
Plan on new thrust washers and bearings anywhere end play is out of spec, a new pan and filter, a full cooler flush and fresh ZF LifeguardFluid 8. If metal has circulated through the mechatronic unit, inspect it carefully and replace it if valves are scored.
ZF specifies LifeguardFluid 8 for the 8HP. Do not top off with a generic multi-vehicle ATF. The level has to be set with the transmission in its specified temperature window and the engine running.
Yes. The transmission control module stores adaptive fill values for each shift element. After a teardown and repair, reset or relearn the adaptations with a capable scan tool and complete a drive cycle so shifts settle in.
It is the planetary assembly shown in the photo, with the output shaft and surrounding drum section. Compare it to your removed part before installing. If you need a full set of seals, frictions and gaskets for the overhaul, ask us and we will point you to the matching kit.
