A750F Master Rebuild Kit 2003, new and ready to install. Fits the A750F. Ships fast from the USA.
Four-wheel-drive Toyota trucks and the Lexus GX470 live hard lives: towing, trail work, heavy tires and long climbs all put heat into the five-speed A750F. When that heat finally cooks the clutch packs, the truck starts slipping on hills, flaring between gears or refusing to hold a gear under load, and the fluid comes out dark and burnt. This A750F master rebuild kit covers 2003-up units and supplies the overhaul gasket and seal set, friction modules, steel plates, molded pistons and a filter so the entire main case can be renewed in one teardown. The listing reference number is HDK5400J.
The A750F is the four-wheel-drive member of the Toyota/Aisin A750 five-speed family. Its gear train, clutch packs and valve body work the same way as the two-wheel-drive A750E; the difference is at the back, where the case is built to mate with a transfer case instead of a plain tailshaft. Inside, each gear is engaged by hydraulic pressure clamping a pack of frictions against steels. Heat is what ends those packs: once the friction surface glazes, the pack slips, slipping makes more heat, and the cycle finishes the unit quickly. This kit replaces the wear parts of that system, including the bonded pistons whose rubber lips harden with heat and start to bleed off apply pressure.
Start with the fluid condition and a scan for stored codes. If the fluid is still clean and the complaint is a single code, you may be looking at a solenoid or valve body problem rather than burnt packs; our transmission slipping diagnosis guide covers how to tell those apart on a road test. If the truck tows or runs hot, read why Aisin units overheat so the rebuilt unit does not go the same way. Burnt fluid plus friction debris means the clutches are done and this kit is the repair.
This kit is listed for the A750F from 2003 up in four-wheel-drive Toyota 4Runner, Tacoma, Tundra, Sequoia and FJ Cruiser models and the Lexus GX470 and GX460, plus other vehicles built with the A750F. Production ran across many model years with running changes to individual hard parts, so match the transmission code on the case and count the clutches in each drum against the kit before disassembly, and expect component brands to vary by batch. Send us your year and VIN if you want us to confirm fitment. Two-wheel-drive trucks use the A750E master rebuild kit, and the full parts list for this family is on our Aisin transmission parts page.
| Fits | A750F 2003 |
| Part type | Master Rebuild Kit |
| Condition | New |
| Brand | OEM |
| Reference | A750E |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
The clutch packs, pistons and main case seals are shared across the A750 family, which is why the same kit is listed for both. The A750F is the four-wheel-drive version that bolts to a transfer case; that transfer case is serviced separately.
Four-wheel-drive Toyota 4Runner, Tacoma, Tundra, Sequoia and FJ Cruiser models with the five-speed automatic, plus the Lexus GX470 and GX460. Check the code on the transmission case to be sure.
Included: overhaul gasket and seal kit, friction modules, steel plates, molded pistons and a filter. Not included: drums, planetary sets, bushings, solenoids, the valve body or the torque converter.
Slipping only under load can be low line pressure from a worn boost valve before the packs are burnt. Check the fluid: clean fluid points to the valve body first, burnt fluid with debris means the frictions need this kit.
Toyota WS ATF in the transmission. The transfer case uses its own specified lubricant, so do not fill it with ATF unless your owner's manual calls for it.
