4.10 front, 3.9 rear... oops
#1
3.9 front, 4.10 rear... oops
The title incorrectly states 4.10 front, 3.9 rear
Yes, thats right.. I think I mistakenly installed a 3.9 front diff into my 4.10 equipt (rear/old front) runner.
In the dirt its not noticable, on pavement... its noticable. Theres resistance in forward/reverse motion. (obviously)
Is it feasable to say screw it, and leave this configuration? This was quite a lot of work for me in my garage with just SUV jackstands. Im in NO hurry to pull it back out. I guess it wont HURT anything, as long as I stay off the pavement in 4WD, (especially at any speed) off road, im sure its fine.
(although it sucks because I know its just not "right")
Tire info: 265/75 16 BFG Mud Terrain.
edit: fixed title
Yes, thats right.. I think I mistakenly installed a 3.9 front diff into my 4.10 equipt (rear/old front) runner.
In the dirt its not noticable, on pavement... its noticable. Theres resistance in forward/reverse motion. (obviously)
Is it feasable to say screw it, and leave this configuration? This was quite a lot of work for me in my garage with just SUV jackstands. Im in NO hurry to pull it back out. I guess it wont HURT anything, as long as I stay off the pavement in 4WD, (especially at any speed) off road, im sure its fine.
(although it sucks because I know its just not "right")
Tire info: 265/75 16 BFG Mud Terrain.
edit: fixed title
Last edited by lllateralus; 03-17-2006 at 12:08 PM.
#2
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A good friend of mine ran a similar setup, 3.91 in the rear and 4.10's in the front for 2 years and had no problems..Now keep in mind he only engaged the 4wd when necessary..His Taco is an Automatic so it wasn't as much of an issue..
#6
Contributing Member
This will sound odd.. but just let more air out of the front or rear. Change the wheel size a bit, and you will lessen the difference.
Don't ask me about the math to figure it all out though... I am just an idea man.
Don't ask me about the math to figure it all out though... I am just an idea man.
#7
that's what steve (sschaefer3) does since he has 5.29 rear and 5.38 fronts. he lets more air out of the rear since he is only 9 points off. since you're about 19/20 points off, that's a LOT of difference in air pressure
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#8
Registered User
Originally Posted by Yoda
You may not feel it, but your Ujoints and your front axles/CV will have additional stress put on them
lllateralus;
You have to understand that what you "feel" on the pavement is very little compared to the stress that's actually going on in the drivetrain. There's a lot between your feelers and the U-joints & CVs to mask the stress.
The math shows that your front end is turning about 5% faster than your rear. That's a LOT. You really need to put the right gears in there.
#9
Contributing Member
I was just doing the math also, and what you are "feeling" is definately from a very padded standpoint, the additional torque placed on your drivetrain before your tires break (coef of friction based on pretty conservative estimate) is huge... Id avoid 4wd until you can get that fixed correctly
#10
Well, I confirmed that it is a different ratio today.
Dirt road, marked all 4 tires at 12:00, 4-hi, drove slowly about
150 feet, (~) front tire marks were down at 6:00, rears were back at 12:00.
(roughly) :pat:
Dirt road, marked all 4 tires at 12:00, 4-hi, drove slowly about
150 feet, (~) front tire marks were down at 6:00, rears were back at 12:00.
(roughly) :pat:
#11
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Just get bigger tires for the rear until you can get your gears swapped out (that will get you closer, anyways. You may get lucky and match it close enough so that you don't have to change your gears). And as others have said, stay out of 4WD while on pavement.
#13
Bruce, thats not a bad idea.... although Ive never set up a R/P. I could phisically unbolt/bolt the gears, but as far as precision tools, or proper clearances ect... I dont have the skill or tools.
Last edited by lllateralus; 03-17-2006 at 06:09 PM.
#14
Registered User
I have a transfer case for sale! If you dont change them your going to be PM'ing me! ALWAYS run the same gears front to rear. Maybe in strict off-road conditions you can get away with it but for 99% of the members here, we all run same gearing front and rear.
James
James
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