Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Automatic Transmission Unit: Inspection
- INSPECT NO. 1 BRAKE DISC
- Replace all discs if one of the following problems is present: 1) a disc, plate or flange is worn or burnt; 2) the lining of a disc is peeled off or discolored; or 3) grooves or printed numbers have even a little bit of damage.NOTE: Before assembling new discs, soak them in ATF for at least 2 hours.
- Replace all discs if one of the following problems is present: 1) a disc, plate or flange is worn or burnt; 2) the lining of a disc is peeled off or discolored; or 3) grooves or printed numbers have even a little bit of damage.
- INSPECT FRONT PLANETARY GEAR ASSEMBLY
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
- Using a feeler gauge, measure the front planetary gear pinion thrust clearance.
Standard clearance:
0.2 to 0.6 mm (0.008 to 0.024 in.)
If the clearance is not as specified, replace the front planetary gear assembly.
- Using a feeler gauge, measure the front planetary gear pinion thrust clearance.
- INSPECT NO. 3 CLUTCH DISC
- Replace all discs if one of the following problems is present: 1) a disc, plate or flange is worn or burnt; 2) the lining of a disc is peeled off or discolored; or 3) grooves or printed numbers have even a little bit of damage.NOTE: Before assembling new discs, soak them in ATF for at least 2 hours.
- Replace all discs if one of the following problems is present: 1) a disc, plate or flange is worn or burnt; 2) the lining of a disc is peeled off or discolored; or 3) grooves or printed numbers have even a little bit of damage.
- INSPECT REVERSE CLUTCH DISC
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
- Replace all discs if one of the following problems is present: 1) a disc, plate or flange is worn or burnt; 2) the lining of a disc is peeled off or discolored; or 3) grooves or printed numbers have even a little bit of damage.NOTE: Before assembling new discs, soak them in ATF for at least 2 hours.
- Replace all discs if one of the following problems is present: 1) a disc, plate or flange is worn or burnt; 2) the lining of a disc is peeled off or discolored; or 3) grooves or printed numbers have even a little bit of damage.
- INSPECT REVERSE CLUTCH RETURN SPRING SUB-ASSEMBLY
- Using a vernier caliper, measure the free length of the spring together with the spring seat.
Standard free length:
22.21 mm (0.8744 in.)
If the free length is shorter than the standard free length, replace the reverse clutch return spring sub-assembly.
- Using a vernier caliper, measure the free length of the spring together with the spring seat.
- INSPECT OVERDRIVE CLUTCH RETURN SPRING SUB-ASSEMBLY
- Using a vernier caliper, measure the free length of the spring together with the spring seat.
Standard free length:
21.09 mm (0.8303 in.)
If the free length is shorter than the standard free length, replace the forward clutch return spring sub-assembly.
- Using a vernier caliper, measure the free length of the spring together with the spring seat.
- INSPECT NO. 3 CLUTCH DRUM SUB-ASSEMBLY
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
- Using a caliper gauge, measure the inside diameter of the overdrive and reverse multiple disc clutch drum bush.
Standard inside diameter for front side:
67.40 to 67.44 mm (2.6535 to 2.6551 in.)
Standard inside diameter for rear side:
55.62 to 55.64 mm (2.1898 to 2.1905 in.)
If the inside diameter is not as specified, replace the overdrive and reverse multiple disc clutch drum.
- Using a caliper gauge, measure the inside diameter of the overdrive and reverse multiple disc clutch drum bush.
- INSPECT FORWARD MULTIPLE CLUTCH DISC
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
- Replace all discs if one of the following problems is present: 1) a disc, plate or flange is worn or burnt; 2) the lining of a disc is peeled off or discolored; or 3) grooves or printed numbers have even a little bit of damage.NOTE: Before assembling new discs, soak them in ATF for at least 2 hours.
- Replace all discs if one of the following problems is present: 1) a disc, plate or flange is worn or burnt; 2) the lining of a disc is peeled off or discolored; or 3) grooves or printed numbers have even a little bit of damage.
- INSPECT FORWARD CLUTCH RETURN SPRING SUB-ASSEMBLY
- Using a vernier caliper, measure the free length of the spring together with the spring seat.
Standard free length:
20.82 mm (0.8197 in.)
If the free length is shorter than the standard free length, replace the forward clutch return spring sub-assembly.
- Using a vernier caliper, measure the free length of the spring together with the spring seat.
- INSPECT FORWARD CLUTCH DRUM SUB-ASSEMBLY
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
- Using a caliper gauge, measure the inside diameter of the forward clutch drum bush.
Standard inside diameter:
33.200 to 33.225 mm (1.3071 to 1.3081 in.)
If the inside diameter is not as specified, replace the forward clutch drum sub-assembly.
- Using a caliper gauge, measure the inside diameter of the forward clutch drum bush.
- INSPECT SUN GEAR INPUT DRUM SUB-ASSEMBLY
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
- Using a caliper gauge, measure the inside diameter of the sun gear input drum bush.
Standard inside diameter:
45.075 to 45.100 mm (1.7746 to 1.7756 in.)
If the inside diameter is not as specified, replace the sun gear input drum sub-assembly.
- Using a caliper gauge, measure the inside diameter of the sun gear input drum bush.
- INSPECT REAR PLANETARY SUN GEAR ASSEMBLY
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
- Using a caliper gauge, measure the inside diameter of the rear planetary sun gear bush.
Standard inside diameter:
28.700 to 28.721 mm (1.1299 to 1.1307 in.)
If the inside diameter is not as specified, replace the rear planetary sun gear assembly.
- Using a caliper gauge, measure the inside diameter of the rear planetary sun gear bush.
- INSPECT REAR PLANETARY GEAR ASSEMBLY
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
- Using a feeler gauge, measure the rear planetary gear pinion long and short thrust clearance.
Standard clearance:
0.2 to 0.6 mm (0.008 to 0.024 in.)
If the clearance is not as specified, replace the rear planetary gear assembly.
- Using a caliper gauge, measure the inside diameter of the rear planetary gear bush.
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Standard inside diameter for front side:
71.60 to 71.63 mm (2.8189 to 2.8201 in.)
Standard inside diameter for rear side:
28.700 to 28.721 mm (1.1299 to 1.1307 in.)
If the inside diameter is not as specified, replace the rear planetary gear assembly.
- Using a feeler gauge, measure the rear planetary gear pinion long and short thrust clearance.
- INSPECT NO. 1 1-WAY CLUTCH
- Set the 1-way clutch to the rear planetary gear.
- Hold the rear planetary gear assembly and turn the 1-way clutch.
- Check that the 1-way clutch turns freely counterclockwise and locks clockwise.
If there is a problem with the 1-way clutch, replace it.
- INSPECT NO. 2 BRAKE DISC
- Replace all discs if one of the following problems is present: 1) a disc, plate or flange is worn or burnt; 2) the lining of a disc is peeled off or discolored; or 3) grooves or printed numbers have even a little bit of damage.NOTE: Before assembling new discs, soak them in ATF for at least 2 hours.
- Replace all discs if one of the following problems is present: 1) a disc, plate or flange is worn or burnt; 2) the lining of a disc is peeled off or discolored; or 3) grooves or printed numbers have even a little bit of damage.
- INSPECT NO. 2 CLUTCH DISC
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
- Replace all discs if one of the following problems is present: 1) a disc, plate or flange is worn or burnt; 2) the lining of a disc is peeled off or discolored; or 3) grooves or printed numbers have even a little bit of damage.NOTE: Before assembling new discs, soak them in ATF for at least 2 hours.
- Replace all discs if one of the following problems is present: 1) a disc, plate or flange is worn or burnt; 2) the lining of a disc is peeled off or discolored; or 3) grooves or printed numbers have even a little bit of damage.
- INSPECT DIRECT CLUTCH RETURN SPRING SUB-ASSEMBLY
- Using a vernier caliper, measure the free length of the spring together with the spring seat.
Standard free length:
20.76 mm (0.8173 in.)
If the free length is shorter than the standard free length, replace the direct clutch return spring sub-assembly.
- Using a vernier caliper, measure the free length of the spring together with the spring seat.
- INSPECT 2ND BRAKE PISTON RETURN SPRING SUB-ASSEMBLY
- Using a vernier caliper, measure the free length of the spring together with the spring seat.
Standard free length:
23.36 mm (0.9197 in.)
If the free length is shorter than the standard free length, replace the 2nd brake piston return spring sub-assembly.
- Using a vernier caliper, measure the free length of the spring together with the spring seat.
- INSPECT AUTOMATIC TRANSMISSION CASE SUB-ASSEMBLY
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
- Using a caliper gauge, measure the inside diameter of the automatic transmission case sleeve bush.
Standard inside diameter:
49.07 to 49.155 mm (1.9319 to 1.9352 in.)
If the inside diameter is not as specified, replace the automatic transmission case sub-assembly.
- Using a caliper gauge, measure the inside diameter of the automatic transmission case sleeve bush.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
No obligation. See pricing before you book.