blueyoda

Did any of the 89-95 runners or trucks come with a 7.5" rear end? I didn't think so but I have a person trying to buy some gears for his rig and swears that it has a 4.88 7.5" rear? Anyone know if this could be or is he just plain wrong?

MudHippy

If it's a 2WD then it might. If it's a 4WD then it does not.

tried4x2signN

The 2WD "pre-runner" 4Runners were 8" too.

The 7.5" REAR was only used in 2WD mini trucks. And is reputed to be THE SAME EXACT gears the IFS FRONTS use.

tried4x2signN

yep. RTE's and V6 2WD's were 8" too.

blueyoda

thanks, that what I thought.

MudHippy

The FSM states on page SA-136 that the 2WD 7.5" is a 2-pinion.
http://personal.utulsa.edu/~nathan-b...35differen.pdf

There actually are no 2WD or 4WD 7.5" differentials(V6/Turbo or 4cyl.)with more than 2-pinions/spider gears. And all 2WD 7.5"(V6/Turbo or 4cyl.) differentials use 27 spline axleshafts having 5 lug hubs. All 4WD IFS 7.5" diffs use 27 spline axleshafts connecting to 6 lug hubs.

The 4WD IFS 7.5" front axle has, in fact, the exact same 2-pinion/spider gear differential as the 2WD 7.5" rear axle. You can directly swap the 4WD IFS 7.5" differentials with the 2WD 7.5" differentials, gears and all. Just the 4WD 7.5" front housings and 2WD 7.5" rear housings are different, but the ring and pinion/spider gears/side gears/carriers/bearings are all identical for both.

But the FSM also states that some 2WD axles actually have 8" 2-pinion or 8" 4-pinion diffs, which would have 30 spline axleshafts with 5 or 6 lug hubs. All 4WD 8" axles, front or rear, use 30 spline axleshafts with 6 lug hubs. So if it's a 2WD with 5 or 6 lug axles/hubs it's got a 7.5" or 8" differential, which is either a 7.5" 2-pinion, 8" 2-pinion, or an 8" 4-pinion diff. That's where the only difference in the number of pinions/spider gears would be. I can also guarantee they only put the 8" 4-pinion diff behind the V6/Turbo and never behind the 4cyl., 2WD or 4WD. All 8" 4cyl diffs are 2-pinion(2WD or 4WD front/rear). And 8" V6/Turbo rear axles can have either 2-pinion or 4-pinion 8" diffs(2WD or 4WD).

However, 8" 4-pinion(V6/Turbo)diffs aren't directly swappable with 8" 2-Pinion(4cyl.) diffs. You have to swap the entire 8" 3rd member(V6/Turbo or 4cyl.)between the 8" axle housings, or get conversion bearings to fit the 8" 4-pinion differential(V6/Turbo) in the 4cyl.(8" 2-pinion)3rd member.

And that's how it be.

MudHippy

Plainly stated, it's a 2WD 1/2 ton PU. Doesn't matter if it's got a 4cyl., turbo 4cyl., or a V6. If it has 5 lug wheels it's a 2WD PU with a 7.5" or 8" 1/2 ton axle.
2WD 7.5" axle(1/2 ton) = 27 spline axleshafts with 5 lug hubs.

2WD 8" axle(1/2 ton) = 30 spline axleshafts with 5 lug hubs.

4WD 8" front/rear axle(1/2 ton, 3/4 ton, 1 ton) = 30 spline axleshafts with 6 lug hubs.

2WD 1 ton PU, 2WD 3/4 ton PU, or 2WD 1/2 ton 4Runner. All have 8" axles with 6 lug hubs, single tire or dually. Axle size is based on the intended load carrying capacity of the vehicle, not on engine displacement. Hence why a 2WD 1/2 ton 4Runner has an 8" axle. Because it weighs more than a 2WD 1/2 ton PU and is intended to carry an additional 1/2 ton on top of that. All 4WD PUs & 4Runners have 8" rear axles for the exact same reason, they're all 1/2 ton and weigh considerably more than a 2WD 1/2 ton PU.

And you can take that to the bank!

stanglover37

Hey guys, I thought this would be a good thread to hop onto. I am trying to figure out what axles are interchangeable with my 93 4x4 v6. I bent one in the snow and need to know what years I can rob from. Were there any changes between years?

On edit, to clarify, I am concerned with axle widths and similar issues like brake backing plate. It sounds like all the v6 4x4s will work as far as splines but I am not seeing axle widths mentioned. Are they all the same? That would be nice...

Thanks

MudHippy

All 86-95 4WD axleshafts are swappable between V6/Turbo and 4cyl. rear axle housings. They're all the same width and same number of splines. The only differences will be between ABS or non-ABS. I believe(not 100% sure)the brake backing plates are slightly different, and the axleshafts may have an extra part for the ABS(see diagram below).

4Runners also have wider brake shoes than some PUs, but the brake drums are all the same. So if you end up with one that does have wider, or skinnier, brake shoes than yours you'll have to swap the shoes and drum over from your old one. Or you'll have better brakes on one side only, and that's not a good thing. You could also buy new shoes for the other side to match. In which case you'd need to have that drum turned, or replace it too though.



Good luck!

MudHippy

Scratch that. It turns out that some 2WD axles have 8" differentials and 30 spline axleshafts with 5 lug hubs.

See this thread for more info on that.
https://www.yotatech.com/forums/f116...ebuild-209324/

Massive post corrections completed. Sorry for the confusion.