Rear Axle Swap GEN2 '90->'93 ???? - Toyota 4Runner Forum

captwalker87 · 09-29-2005, 10:27 PM

Ill first explain my situation.. i have a 93 t4r 5speed 3vze that has 230k mi on it. I was crusing down the freeway at 70mph when my truck stop accelerating. i thought that maybe it popped it out of gear, so i tried putting it into 5th. yet again it was still not accelerating and all of the sudden my rear differental locked up and the effect was basically slamming on the brakes. so as of right now my truck is on the side of the highway. quick solution. i bought a '90 t4r today that has no motor and a bad auto tranny. basically, its a parts car. theoritically speaking, there should be no problem swapping rear ends since they are both GEN2's, right? any remarks would be appreciated.

fourwd1 · 09-30-2005, 03:50 PM

Right, shouldn't be any problem swapping

Just make sure the gearing is the same.

vandert · 09-30-2005, 05:19 PM

You said from a truck to a Runner, your spring perches in the rear are goign to be different, you will have to weld them to get the right ones on.

Also, if your truck is a 4 cylinder it's pretty much going to be 4:10's, your runner is probably 3.73's if it's an auto.

Another thing to think about is the 4cylinder and 6cylinder have different carrier's. If you want to ever change your gearing, you will need the 6 cylinder carrier, it's not weaker, but it's stronger for the new gears. If you understood that.

The only problem you could have are, Spring Perches, going from a leaf spring on the truck to a Coil spring on the Runner, and the gear difference.

Both of those problems will keep you from driving. Unless you never plan on using your 4wd and having it disingauged the whole time your driving.

Just a thought.

But it is fact.

T

vandert · 09-30-2005, 05:21 PM

Your perches should be fine, I just reread and saw you said 4R to 4R.

However, your going from a 5speed to a Auto, gearing will probably be different.

Seeing has you can't rotate the rear axle on your runner to test out current gearing, might be worth it for you to change out both front and rear axles, you'll loose some acceleration though with the auto gears as I'm sure they are 3.73's. You should be running 4:10's right now IFS axles aren't that hard to change out, might be worth it, it would be cheaper than a gear swap for you though.

T

fourwd1 · 10-02-2005, 01:49 PM

In the US, 2nd gen 4Runners had leaf springs in the rear, and no 3.73 gears.

An auto tranny usually has lower gearing than a manual, typically 4.30 or 4.56 in US Toyotas.

If the auto equipped donor truck does have lower gears than 4.10, it would be a bonus. The lower gears will work better with larger than stock tires.

vandert · 10-02-2005, 04:14 PM

Now we really have him confused. I thought that the auto's came with 3.73's or lower. I swapped to 4.88's in my 86 Project as I used to call it but I swapped a 44 in the front and threw out the InferiorFS.

Regardless, a 90's rear axle should bolt up to a 93, or vise versa. Just make sure you have the same ratio. There's other options if the gear ratios don't match up though so hope we didn't confuse you too much.

T

captwalker87 · 10-03-2005, 01:09 PM

well, given that i have no idea what the gear ratio is on that rear axle, im not driving it in 4wd. however, the axle did bolt up, but it took a lot of prying and pushing to get the upper and lower control arms to bolt up. but as of right now, my 93 is rolling around on a 90 axle. thanks for the help guys.

fourwd1 · 10-03-2005, 01:50 PM

Quote:

Originally posted by vandert
Now we really have him confused. I thought that the auto's came with 3.73's or lower.
T

No, an auto equipped vehicle always comes with slightly lower gearing than a manual.

4x4Ratty · 11-16-2005, 11:32 PM

Quote:

Originally posted by fourwd1
In the US, 2nd gen 4Runners had leaf springs in the rear, and no 3.73 gears.

2nd gen 4runner never had leaf springs in the rear. that was the change that came with 2nd gens, they had a coil setup in the rear. the front is pretty much the same as the 1st gens, but the rear is completely different.

Sidney · 11-17-2005, 11:18 PM

Quote:

Originally posted by captwalker87
well, given that i have no idea what the gear ratio is on that rear axle, im not driving it in 4wd. however, the axle did bolt up, but it took a lot of prying and pushing to get the upper and lower control arms to bolt up. but as of right now, my 93 is rolling around on a 90 axle. thanks for the help guys.