Master rebuild kit for the Toyota A750E and A750F 5-speed automatic in the Tacoma, Tundra, 4Runner, FJ Cruiser, Sequoia, Land Cruiser and GX470.
If your Tacoma, Tundra, 4Runner or FJ Cruiser has started flaring between gears when you pull a trailer, slips in third or fourth with throttle, or the fluid on the dipstick smells burnt, the five-speed A750 behind the engine is most likely due for a full overhaul. This master rebuild kit is built for the Aisin-made A750E (two-wheel drive) and A750F (four-wheel drive) and is the parts set you order once the transmission is out of the truck and on the bench. It also lists coverage for the Sequoia, Land Cruiser, Lexus GX470 and LX.
The A750 is a five-speed rear-wheel-drive automatic with first through fifth ratios of 3.52, 2.042, 1.40, 1.00 and 0.716. Every one of those gears is held by clutch packs and brakes that are applied by line pressure through lip seals and sealing rings. When the frictions glaze or the rubber hardens, apply pressure leaks off and the clutch slips instead of locking. A master kit replaces all of that wear material at once: friction and steel plates for the clutch packs plus the seals and gaskets that keep pressure where it belongs. That way the truck does not come back with a fresh 2-3 shift and a slipping fourth because one pack was reused.
Several of these complaints can come from the valve body rather than worn clutches. TransGo documents that the soft aluminum line pressure boost valve and its bushing wear on 2003 and newer A750 units, which lowers line rise under load and burns frictions. If you rebuild the clutch packs and leave that valve worn, the new frictions are fed the same weak pressure.
Scan for stored codes, then check line pressure at idle and stall in Drive and Reverse with a gauge on the test port. Normal pressure combined with a slipping gear points at the clutch pack. Low pressure that does not rise under load points at the pump, boost valve or solenoids first. Our line pressure testing guide walks through the hookup, and Aisin slipping under load covers how to split a clutch failure from a hydraulic one on this family.
The kit is listed for the 4Runner 4.0L and 4.7L 2003-2008, FJ Cruiser 2007-2014, Land Cruiser 2000-2014, Sequoia 4.7L 2005-2008, Tacoma 4.0L 2005-2014, Tundra 4.0L and 4.7L 2005-2014, Lexus GX470 2003-2009 and LX 2003-2007. Be careful on the edges of that range: published application lists put the A750F in the 100-series Land Cruiser for 2003-2007, so early and late Land Cruisers should be checked before ordering, and Tundra owners should confirm the engine and transmission code on V6 trucks. Read the A750E or A750F code on the transmission identification tag, or send us the year and VIN and we will check it for you. Browse every Aisin part we carry on the Aisin transmission page.
Before you stack a single plate, inspect the drums for spline wear and heat checking, the planetary pinions for end play, and the pump and stator bushings. A cracked or worn input drum will undo the rebuild, so price an A750E input drum if yours shows damage. Soak the new frictions in Toyota WS fluid before assembly, measure each pack's clearance as it goes together, and air-check every circuit with the case still open. While the valve body is off, this is the time to install a shift kit that addresses the worn bores. Flush the cooler and lines before the transmission goes back in, as covered in our cooler flush guide, then fill with Toyota WS fluid only and check level at the specified temperature. Clear the adaptive values with a scan tool and drive the truck through every shift to let it relearn.
| Fits | Toyota / Aisin A750E, A750F 5-speed automatic |
| Vehicles | 4Runner 2003-2008, FJ Cruiser 2007-2014, Land Cruiser 2000-2014, Sequoia 2005-2008, Tacoma 4.0L 2005-2014, Tundra 2005-2014, Lexus GX470 2003-2009, LX 2003-2007 |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
Yes. The A750E is the two-wheel-drive version and the A750F is the four-wheel-drive version of the same five-speed, and the kit is listed for both. Check the code on the transmission tag before ordering.
Only if the flare is caused by worn clutches or leaking seals. Worn valve body bores and the line pressure boost valve cause the same complaint, so check line pressure first and plan to repair the valve body during the rebuild.
Toyota WS (World Standard) ATF only. Do not use Dexron or a generic multi-vehicle fluid. Pre-soak the new frictions in the same WS fluid before assembly.
Inspect and replace any worn drums, bushings and planetaries, repair the valve body bores with a shift kit, and replace solenoids that test weak. Flush the cooler and lines so old friction debris does not return to the new unit.
Do not assume it will. Published application lists show the A750F in the Land Cruiser from 2003 to 2007, with other transmissions before and after. Read the transmission tag or send us your year and VIN and we will confirm before you order.
