8HP70 Solenoid Kit, new and ready to install. Fits the 8HP70. Ships fast from the USA.
The 8HP70 is the higher-torque version of ZF's first-generation eight-speed. It sits behind V8 and high-output engines: Hemi and SRT Grand Cherokees, Chargers, Challengers and Durangos, plus larger BMW, Jaguar and Land Rover models. Owners shopping for this part usually describe the same things: a hard 1-2 shift on a cold morning, a thump going from Reverse into Drive, harsh downshifts when coasting to a stop, or a wrench light with the transmission stuck in a single gear. This is the new, genuine ZF solenoid kit, OE number 1087 298 388, made in Germany. It is the same factory set ZF specifies for the 8HP45 and 8HP70 Gen 1 valve body, so the 8HP70 shares it with the smaller box even though its clutch packs and housings are built for more torque.
The 8HP70 gets eight forward ratios from four planetary gearsets and just five shift elements, two brakes and three clutches. Three elements are applied in every gear, so most shifts are a timed handoff where one element releases while another applies. Each element is applied by its own pressure regulator on the mechatronic unit, with separate regulators for line pressure and converter lockup and an on-off solenoid for park. Sonnax's identification chart lists eight positions in all. Because a V8 puts more torque through the same regulators, small pressure errors are felt sooner and wear the clutches faster, so a weak regulator on an 8HP70 tends to show up as a harsh or slipping shift rather than a subtle change.
Be careful with the first three. Chrysler bulletin 21-018-15 lists exactly those complaints on the 2015 Grand Cherokee SRT with the 6.4L and 8HP70, and the factory repair was a control module reflash, not hardware. The Grand Cherokee 8HP shift problems guide covers how to separate software from parts.
ZF 1087 298 388 is listed for BMW, Jaguar, Land Rover and Rolls-Royce applications, 2014-up Jeep Grand Cherokee, and 2015-2023 Dodge Challenger, Charger and Durango with the Gen 1 eight-speed. It does not fit Gen 2 8HP75, 8HP95 or 850RE units, which use solenoids with different snout diameters and swap the B and D positions. Several Chrysler, Ram and Jeep models changed to Gen 2 from 2019, so a late-model V8 should be checked by valve body casting code, or send us the year and VIN. The 8HP90 behind supercharged engines is also Gen 1 but confirm with us before ordering. Shop the full range on the ZF 8HP collection page.
| Fits | 8HP70 |
| Part type | Solenoid Kit |
| 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.
No. ZF uses the same solenoid kit, 1087 298 388, for both Gen 1 units. The 8HP70 differs in its clutch packs and hard parts, not in the solenoids that control them.
Many 2019-up Ram, Jeep and Chrysler V8 models use the Gen 2 8HP75 instead of the 8HP70, and Gen 2 solenoids are not interchangeable. Check the valve body casting or send us your VIN so we can confirm before you order.
Possibly, but check the software first. Chrysler bulletin 21-018-15 addressed harsh shifts, an erratic cold 1-2 upshift and delayed Reverse-to-Drive on the 2015 SRT with a reflash only.
A pan-off solenoid job takes far less than a dry rebuild, which needs about 9 liters. Fill with ZF LifeguardFluid 8 until it runs out of the fill hole with the engine idling and the fluid between 30 and 50 degrees C.
Yes if it is original or the seals are hard. A leaking sleeve loses pressure before it reaches the valve body and causes the same harsh and slipping shifts as a bad solenoid. It is not included in this kit.
