Transmission History by Year - Toyota 4Runner
2003 - 2009: A340F 4-speed automatic (4.0L V6) 2010 - present: A750F 5-speed automatic (4.0L V6) - TRD and SR5 2025+: 8-speed automatic (new platform)
Expert Toyota 4Runner transmission service in Chicago. Free computer diagnostic, 2-year / 24,000-mile warranty on rebuilds, all years.
We will contact you as soon as a service member is available by call, text, or email.
2003 - 2009: A340F 4-speed automatic (4.0L V6) 2010 - present: A750F 5-speed automatic (4.0L V6) - TRD and SR5 2025+: 8-speed automatic (new platform)
A750F OD planetary: full rebuild recommended ($1,800 - 2,600). Transfer case output seal: standalone repair ($200 - 350). A340F: rebuild if OD band or planetary are worn.
Toyota ATF WS - change every 30,000 miles for off-road use
Verify exact spec on the dipstick label or owner's manual before fill. Recommended change interval: every 60,000 miles for normal driving, 30,000 miles under severe service (towing, stop-and-go, hot climates). Pan service typically takes 6 - 8 quarts; a full fluid exchange takes 10 - 14 quarts depending on cooler-line capacity.
Rebuild: 3 - 4 days.
Fluid service and inspection complete the same day. Solenoid or sensor replacement: 1 day. Torque converter or seal repair: 2 - 3 days. Full rebuild with road test: 4 - 6 days. Time estimates assume parts in stock - call (312) 626-8759 to verify availability for your specific vehicle.
Every vehicle needs diagnosis before anyone can promise a repair path. These are the situations we help organize before you decide what to do next.
Tell us when it happens, whether reverse still works, and if warning lights are on. A scan and fluid check come before guessing at a rebuild.
Fluid condition, leak location, and driving distance matter. If the vehicle is slipping badly or overheating, towing may be the safer next step.
A failed solenoid, valve body, converter, or internal clutch problem can lead to very different repair paths. The goal is a clear diagnosis and written estimate.
Yes - 4Runners hold their value extremely well. A rebuilt transmission with 2-year / 24,000-mile warranty on a clean 4Runner is the right call.
Absolutely - off-road use introduces contaminants faster. Change ATF WS every 20,000 - 25,000 miles and inspect for metal particles.
Could be the rear transmission seal or the transfer case output seal. We'll diagnose - the transfer case seal is a common 4Runner issue that looks like a trans leak.
3 - 4 days.
The A750F is a solid unit. The key is fluid maintenance - contaminated fluid from off-road use kills transmissions faster than the terrain itself.
Same-day appointments available. Honest estimates, no surprises. We've been doing this since 1987.
