Hi, I have an 4runner 1995 4x2, 3.0 lts automatic and my rear differential is an 390, like read on door plate, my tires are 265-70-15, on climb run too slow, I want to mount a differential, but I need to know my best combination to mount, somebody told me that a 410 differential is the combination that I need, Hey guys, any idea to me? thankyou

 

I'm in the process of swapping my 3.90 out with a 4.30. I'll be able to tell you about the difference today hopefully. I know that 4.10 is going to give you more torque on those hills. It doesn't sound like much of a difference but it will feel like a lot. My last runner had 4.10s in it and since I've been driving this 3.90 rig, I can tell you the 3.90 are fast once you get them rolling but it does a lot of downshifting once you get a load on it. Definitely liked the 4.10s better.

I think the 4.10 was pretty standard in the 4WD models like yours. You should be able to find a good used one pretty easily.

 

thanks for you help!!!

 

Put a locker in at the same time if you can swing it. You will thank yourself later.

Also don't forget you should do the front and rear at the same time. Otherwise when you put it in 4wd you will have your front end going at a different speed than your rear end.

 

No need to do the front. Says he has a 2wd 4runner

 

Good catch my bad

 

With auto 456 & 29" would still work good.

 

I am not sure of the 2wd auto transmission gears but typically from the factory 4wd's with 31's I believe came with 4:56's. so I would imagine if you went with 29's you would feel a bit more grunt but spin higher RPM's at freeway speed. Someone will chime in and correct me if I am wrong.

 

Auto OD .705
Manual OD .836
This chart will help calculate
http://www.morris4x4center.com/jeep-...FUuRfgodsUcCkw

OD ratios at 65mph/105kph
Stock 411 & 29" = 2180rpm, Which sucks and keeps the torque lock bouncing on and off and lots of trans heat.
430 & 29" = 2267rpm Better then stock for street use.
456 & 29" = 2420rpm Which should work great, Turn the toque lock on early and hold up through 85mph highway.
488 & 29" = 2590rpm, Same as manual OD with 456 & 32" tires which works ok.
I think the auto OD works well between 2300-2500rpm (Not confirmed)
Any opinions on this and I would like to hear from manual shift auto (a340x) shift range opinions.

Manual works well in OD at 2500-2600rpm range @ 65mph
Personal setups.
456 & 31" = 2686rpm, A little high on the rpm range on the freeway. (what was on my runner when I bought it)
456 & 32" = 2600rpm, Works good, Even on inclines.
456 & 33" = 2523rpm, Works good, I got 22mpg on two separate trips but hilly inclines downshift.
488 & 33" = 2700rpm, Way to high for highway use, Gas mileage out the window.
I went 488 with a plan to go back to auto but should have gotten 513 since I was planning 34"-35" tires
But may just stay at 33".

I suggest all offroad autos get an external trans cooler ASAP.