8HP45 Planetary, remanufactured and ready to install. Fits the 8HP45. Ships fast from the USA.
A whine that rises and falls with road speed, a gear that suddenly disappears, or glitter on the magnet when the pan comes off: those are the signs that sent most people to this page. This is a remanufactured planetary for the ZF 8HP45, the light-duty first-generation 8-speed that Chrysler builds under license as the 845RE behind the 3.6L Pentastar in the Charger, Challenger and 300, and that ZF supplies to BMW and other makers for their smaller engines. It is a bench-ready replacement for a gearset with worn pinion bearings, chipped teeth or damaged splines, so a rebuild does not have to reuse a part that already failed once.
The 8HP45 gets eight forward speeds and reverse out of only four planetary gearsets, two brakes (A and B) and three clutches (C, D and E), with three of those five elements applied in every gear. Because the gearsets are interconnected, each one carries load in several ratios rather than just one. Sonnax lists the Charger-family ratios as 4.71 in first through 1.00 in sixth and 0.67 in eighth, with 3.30 in reverse. That shared duty is why a single tired gearset rarely stays quiet: the noise or slip shows up across a group of gears, and the debris it sheds circulates through the whole unit, including the mechatronic valve body.
Rule out the cheap causes first. Check the fluid level the way ZF specifies, with the transmission between 30 and 50 C and the fill plug overflow method, because an 8HP that is a liter low can whine and slip on its own. Then separate gear noise from clutch problems: a planetary noise is mechanical and stays with road speed in a given gear, while a flare or harsh shift points at clutches, solenoids or valve body bores. Our ZF8HP Dodge Charger common problems guide covers the 845RE-specific complaints, and the ZF8HP common problems and fixes guide walks through the full diagnosis. If the pan shows heavy metal, plan on a teardown and inspect all four gearsets before ordering.
This listing is for the 8HP45 only. It is not interchangeable with the larger 8HP70, which uses its own gearsets (see the 8HP70 planetary if that is your unit), and it does not fit the second-generation 8HP50 that replaced the 8HP45 in later vehicles. The listing does not state which of the four gearsets this assembly is, so compare it against the part you removed, matching the gear tooth count, spline count and carrier shape, before installing. When in doubt, send us your year, model and VIN with a photo of the old part and we will confirm. The rest of the range is on our ZF 8HP parts page.
The part is remanufactured, ships from the USA and carries the 1-year warranty shown in the specs.
| Fits | 8HP45 |
| 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.
Yes. The 845RE is Chrysler's license-built version of the ZF 8HP45, used behind the 3.6L V6 in the Charger, Challenger and 300. The hard parts are shared, but confirm your gearset against the old part or send us your VIN.
No. The 8HP70 is a heavier-duty unit with its own gearsets, and the 8HP50 is the second-generation replacement for the 8HP45. This planetary is for the first-generation 8HP45 only.
The listing does not say. Match it to the part you removed by tooth count, spline count and carrier design, or send us a photo of your old gearset with your year and VIN and we will check it before you order.
Yes. Worn pinion bearings usually make a speed-related whine long before anything slips. If the noise changes with road speed and gear, not with engine rpm in park, the gear train is the prime suspect.
Use ZF LifeguardFluid 8 or the Chrysler-approved equivalent, never a universal ATF. A rebuilt unit needs a full fill; set the final level with the transmission at 30 to 50 C using the fill-until-it-overflows method.
Yes. Reset the adaptations with a scan tool once the rebuild is done and the level is set, then drive through every gear so the TCM learns clutch fill on the rebuilt unit.
