Rear Diff. I.D.
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Rockdawg84
New member
to determine your rear diff ratio. lift one tire and take the runner out of gear. use chalk to mark both your dirveshaft and the tire. Turn the tire one 360 degree rotation and count how many times the dirveshaft turns. 4.10's will be 4 turns of the diveshaft plus about 10 degrees. 4.30's will be 4 turns plus 30 degrees. and so on. most likely you have 4:10's if nobody has been into the axle.
good luck
Sam
good luck
Sam
brian2sun
Elite Member
That's true except the tire must be turned twice to account for the differential action. If you have 4.10s, one turn of the tire will give you 2.05 driveshaft revos, 2 turns will give you 4.1 revos. To get an even more accurate ratio, turn the tire 20 times and the driveshaft will spin 41 x's with 4.10s, 43 x's with 4.30, 45.6 x's with 4.56s, etc...
If its stock there is some info on the build sticker on the inside of the drivers door jamb. Use this to decode:
1996-2004 Toyota Gear Ratios - Axle Codes
According to this chart I've got 4.30's. It seems that 4.10's are the norm, so are 4.30's and the E-Locker a somewhat rare combo?
1996-2004 Toyota Gear Ratios - Axle Codes
According to this chart I've got 4.30's. It seems that 4.10's are the norm, so are 4.30's and the E-Locker a somewhat rare combo?
brian2sun
Elite Member
AFAIK, 4.30 gears and the elocker always came as a package on 3rd gens from the factory - You couldn't have an elocker without 4.30s and you couldn't have 4.30s without the elocker.
I would beware of the online gear ratio charts for open diffs. 1 site told me I had 3.90s, another said I had 4.56s. I did the "spin the tire" test and I definitely had 4.10s (before I went to 4.88s of course).
Rockdawg84
New member
mikelowther
New member
Sam,
I printed your instructions on how to determine what gear-set one has in their rear diff.
I am a new member just purchased a 01 TR4 FWD with limited-slip.
I have to replace the rear diff. it is leaking oil threw the steel due to rust, nice!
I went to the dealer but we do not know what gear set to order because the door-jam sticker reads A/TM A02A but the parts manger says that is a 2WD gear-set with a ratio of 3:73 could the Japanese have made a mistake?
So we do not know what to order, he guessed replacement part # 41110-35890 which has a gear-set of 3.90 the only reason he picked this one was it was the only one that was not assigned a door-jam tag model #. He has never seen this before and yes all the VIN #'s match.
Mike
I printed your instructions on how to determine what gear-set one has in their rear diff.
I am a new member just purchased a 01 TR4 FWD with limited-slip.
I have to replace the rear diff. it is leaking oil threw the steel due to rust, nice!
I went to the dealer but we do not know what gear set to order because the door-jam sticker reads A/TM A02A but the parts manger says that is a 2WD gear-set with a ratio of 3:73 could the Japanese have made a mistake?
So we do not know what to order, he guessed replacement part # 41110-35890 which has a gear-set of 3.90 the only reason he picked this one was it was the only one that was not assigned a door-jam tag model #. He has never seen this before and yes all the VIN #'s match.
Mike
I don't know if that's true in all cases, but that is how every new 4Runner W/e-locker was equipped on the lot when I bought mine new, years ago.
My '97 V6, 4x4, 5 speed has 4.10's and the e-locker.
Rockdawg84
New member
Do exactly what Brian said to determine your ratio. Strange that the door sticker is saying that. but easy enough to check your ratio. What do you mean that it has a limited slip? Do you mean E-locker? If E-locker then most likely 4:10's or 4:30's Do you have a 5speed or Auto trans?
good luck
Last edited:
mikelowther
New member
Rear Differential I.D.
Sam,
Thanks for responding so quickly. I will use Brian's method for determining what gear set I have.
I thought all stock T4R's have limited-slip differentials except for the locking differentials.
My SR5 has the most least options one could get from the factory back in 01.
My wife says less to brake, she's right.
So no it does not have a locker.
The vehicle is an Auto-Trans with only 95K miles it still has the new car smell inside it's one clean car except for the rust underneath the back half, [R&R].
I am going to start by throwing the spare tire steel rim in the trash and replace it with an aluminum rim.
Thanks for the info and I will let you know what lives inside my rear-Diff.
Mike
Sam,
Thanks for responding so quickly. I will use Brian's method for determining what gear set I have.
I thought all stock T4R's have limited-slip differentials except for the locking differentials.
My SR5 has the most least options one could get from the factory back in 01.
My wife says less to brake, she's right.
So no it does not have a locker.
The vehicle is an Auto-Trans with only 95K miles it still has the new car smell inside it's one clean car except for the rust underneath the back half, [R&R].
I am going to start by throwing the spare tire steel rim in the trash and replace it with an aluminum rim.
Thanks for the info and I will let you know what lives inside my rear-Diff.
Mike
RHeld24
New member
I believe this thread has lived its course so I'll ask my related question...
So far, I have heard 4.10's and 4.30's coming from the factory with the e-locker.
What other e-locker ratios, if any, were available to the 3rd Gen 4Runner (please list year and if it has ABS)? Also, are e-lockers swappable between automatics and manuals?:shrug:
So far, I have heard 4.10's and 4.30's coming from the factory with the e-locker.
What other e-locker ratios, if any, were available to the 3rd Gen 4Runner (please list year and if it has ABS)? Also, are e-lockers swappable between automatics and manuals?:shrug:
