8HP70 Clutch Drum, new and ready to install. Fits the 8HP70. Ships fast from the USA.
The 8HP70 sits behind the 5.7L and 6.4L Hemi, the 3.0L EcoDiesel and a long list of BMW, Jaguar, Land Rover and Maserati engines, and the torque those engines make is exactly what finds a weak E-clutch drum. This is a new 38-spline E-clutch drum for the ZF 8HP70 and 8HP55, machined from billet 7075-T6 aluminum instead of the factory casting. Builders use it to replace a cracked or worn drum, and as a preventive upgrade when a Hemi or diesel truck is tuned, towing or running bigger tires.
Like every first-generation 8HP, the 8HP70 uses four planetary gearsets, brakes A and B, and clutches C, D and E, with three elements applied per gear. Sonnax's ZF8 apply chart shows clutch E on in 2nd, 3rd, 4th, 6th and 8th, so it is engaged through most highway and around-town driving. The drum is the rotating housing that the E plates lock into; its splines carry the full E-clutch torque. In the 8HP70 the higher torque load means a drum with stretched spline teeth or a cracked web lets the pack slip even when apply pressure is correct. Clutch E is fed by solenoid EDS-4 in the mechatronic unit.
First rule out the simple causes. Per BMW bulletin SI B24 02 13, check the fluid level with the correct test procedure and leave the adaptations alone until the complaint is verified. Next, consider the valve body: Sonnax documents clutch holding valve bore wear on the 8HP70 that produces flare shifts and burnt clutches, and a drum replaced without fixing that will fail again. Our ZF8HP Grand Cherokee shift problems guide and the ZF8HP Charger common problems guide lay out the road test and scan-tool checks. When slip lines up only with the E-clutch gears and the fluid and valve body check out, the E pack and drum are the repair.
This drum is listed for the 8HP55 and 8HP70. Its application list includes Ram 1500 3.0L and 5.7L 2012-2019, Chrysler 300 and Dodge Charger, Challenger and Durango with the 5.7L or 6.4L from 2015, Jeep Grand Cherokee WK2 3.0L EcoDiesel 2014-2016, BMW F30 and F32 diesel models, F10/F11 5 Series, F01/F02 7 Series and the X5 50i, Jaguar F-Type, XF and XJ, Land Rover LR4 2009-2016 and Range Rover and Range Rover Sport, plus Maserati Ghibli, Levante and Quattroporte. The spline count is the deciding check: this drum has 38 splines, while the 8HP45 version has 53. Later trucks and cars moved to the second-generation 8HP75, so on any 2018-up vehicle read the transmission tag or send us your year and VIN. Browse the rest of the range on our ZF 8HP parts page.
| Fits | 8HP70 |
| Part type | Clutch Drum |
| Condition | New |
| 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.
Count the internal splines. This 8HP70 and 8HP55 drum has 38 splines; the 8HP45 and 845RE drum has 53. The two are not interchangeable.
Possibly not. Its listed Ram coverage runs 2012-2019, and newer Hemi Rams use the second-generation 8HP75. Check the tag on the transmission case or send us your VIN before ordering.
If your factory drum is cracked or worn, you are replacing it either way, and a billet drum gives you more margin. On a tuned or heavy-towing 8HP70 it is the common choice because the E clutch is applied in five of the eight forward gears.
The valve body. Worn clutch holding valve bores let feedback pressure escape and cause flare shifts and burnt clutches on the 8HP70. Fix the bores or the new pack can fail the same way.
Yes, after the repair, not before diagnosis. Once the new drum and pack are installed and the fluid level is set, run the adaptation drive cycle so the TCM relearns E-clutch fill.
