A750E Overhaul Kit 2003, new and ready to install. Fits the A750E. Ships fast from the USA.
2003 was the launch year for Toyota's A750 five-speed in North America, and only a handful of vehicles got it: the 4.7-liter V8 4Runner, the Lexus GX470, and in four-wheel-drive form the Land Cruiser and LX470. Those first-year units are now more than twenty years old, and the most common reason they come apart is not broken hard parts but tired rubber. This kit, reference 17301A, is a set of transmission seals for the A750E and A750F catalogued for 2003-and-later units, and this listing is matched to the 2003 model year.
Every shift in the A750 is made by hydraulic pressure. The pump feeds the valve body, the ECM fires shift and lockup solenoids, and the resulting oil travels through case passages and across spinning sealing rings to clutch and brake pistons that squeeze each pack. Rubber piston seals, metal and plastic sealing rings and O-rings are what stop that oil from escaping on the way. After two decades of heat cycles the rubber shrinks and hardens, so pressure that should clamp a clutch bleeds back to the sump. The truck may still drive, but it engages late when cold and slips when loaded. The kit restores that sealing layer. It is a seal kit, not a master kit, so frictions, steels and a filter are bought separately.
On a truck this old it pays to separate seal leakage from the valve body wear these units are known for. TransGo notes that the original A750 accumulator pistons have no seals at all and rely on tight clearances that disappear as the aluminum bores wear, which causes soft and flaring shifts and burns frictions. Their boost valve kit addresses a second wear point that robs line pressure under load. A pressure gauge on the line tap, plus a look at the pan debris, tells you whether you need seals only, seals and frictions, or valve body work too. Our Aisin harsh or delayed shift walkthrough lays out that diagnosis step by step.
In the 2003 model year the A750E went into the two-wheel-drive 4Runner V8, and the A750F went into the 4Runner V8 4x4, GX470, Land Cruiser 100 and LX470. V6 4Runners and Tacomas from 2003 used the older four-speed and do not take this kit. The seals are catalogued for both the E and F versions from 2003 onward, but small running changes happened, so compare each seal to the one you pull out and send us your year and VIN if you want us to verify before ordering. For later years and other A750 parts, see our Aisin transmission collection.
| Fits | A750E 2003 |
| Part type | Overhaul Kit |
| Condition | New |
| Brand | OEM |
| Reference | A750F |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
No. The 2003 V6 4Runner used a four-speed automatic. In 2003 the A750 was fitted to the V8 4Runner, GX470, Land Cruiser and LX470.
The 2003 GX470 uses the four-wheel-drive A750F. These seals are catalogued for both A750E and A750F units from 2003 on, so it applies; send your VIN if you want confirmation before ordering.
No. It is a seal and gasket overhaul kit. Clutch frictions, steel plates and the filter are separate purchases.
Cold-only delay with clean fluid is a classic sign of hardened piston seals, but check fluid level and line pressure first, because a worn boost valve can cause similar complaints.
Toyota WS automatic transmission fluid, checked hot at the overflow plug.
