A750E Planetary 2009, used and ready to install. Fits the A750E. Ships fast from the USA.
Rebuilding a Tacoma, 4Runner or Tundra five-speed and found a chewed-up front ring gear? This listing is the front planetary ring gear for the Toyota A750E, a used original-equipment part with 91 internal teeth, removed from a 2009 Tacoma 4x2. It is the outer gear of the front planetary set, the large toothed ring you see in the photo, and it is a common hard part to need once a truck has been run low on fluid or towed hard with a failing pump.
Every planetary set has three members: a sun gear in the middle, pinions on a carrier, and a ring gear around the outside. In the A750E the front set's ring gear is splined to the parts around it, and the transmission gets different ratios by holding or driving one member while another delivers output. When the internal teeth pit or the outer splines wear, the gearset loses its smooth mesh and the noise travels straight into the cab. Toyota's service data lists a 0.20 to 0.60 mm pinion thrust clearance for the front planetary and a 57.48 mm standard bore for its bushing, which tells you how tight this assembly is supposed to run.
Gear noise is easy to confuse with a wheel bearing, differential or transfer case. Raise the rear wheels, run the truck through the gears on stands and listen with a stethoscope at the bellhousing and tailhousing. If the noise is in the case, pull the pan: fine steel with otherwise healthy fluid points toward gears, while black, burnt fluid points toward clutches. Our warning signs guide covers the early clues, and the end play and thrust washer guide explains how to check the front gearset once it is out.
This ring gear came out of a 2009 Tacoma two-wheel-drive A750E and is listed as an A750E/F front planetary part. The 2009 model year also covers the 4Runner, Tundra, Sequoia and FJ Cruiser with the same five-speed family. Toyota made running changes over the A750's long production, so count the teeth (91) and compare spline count and outside diameter with your original before you order. If you would rather not guess, send us your year and VIN. For drums, kits and valve bodies for the same unit, see the Aisin transmission collection.
Debris from a failed ring gear spreads everywhere, so clean the valve body and replace the filter before you call the job done.
| Fits | A750E 2009 |
| Part type | Planetary |
| Condition | Used |
| 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.
It is listed as an A750E/F front planetary ring gear and was removed from a 2009 Tacoma 4x2. Front gearsets are generally shared, but compare tooth count (91), splines and diameter against your part, or send us your year and VIN to check.
This is the front planetary ring gear shown in the photo. Carrier, pinions and sun gear are not included unless pictured.
Put the truck on stands and run it through the gears. Transmission gear noise is loudest at the case and changes as the transmission shifts; differential noise stays with road speed regardless of gear and is loudest at the axle.
Thrust washers and bearings for the front section, the filter, all seals and any clutch packs that show heat. An A750E overhaul kit covers most of that.
Toyota WS ATF. Fill through the fill plug and check level at operating temperature at the check plug, since the A750E has no conventional dipstick.
