I got a situation here
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Joined: Jul 2005
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From: Downingtown, PA/Milford, DE
Logically explain how that could happen if it isn't in 4x4.
This should be interesting
Registered User
Joined: Jul 2006
Posts: 1,132
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From: MA
I have to put different size tires on the back of my truck (285s on each side of the front and 245s on each side of the back) for a 700 mile trip. It's kind of an emergency. My question is will this damage anything? I cant see what its going to hurt, but this is the first truck I have had that doesnt have lock outs. Sorry, its a 96 2500 4x4 ctd auto. thanks
UM Yes He clearly states it's a 96 2500 4x4 ctd auto. So logically a 245 is a 30 inch tire give or take a 1/10 and a 285 is 32.5 inch tire give or take a 1/10 So ratio x old tire height / new tire height = new ratio. Logically that is 4.10 x 30 / 32.5 = 3.78 and 3.54 x 30 /32.5 = 3.26 I hope you can follow this. Since you could not follow the first post
Registered User
Joined: Oct 2005
Posts: 553
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From: Texas
You are going to wear out your rear end's. By putting different size tires on the font han the back you have changed the ratio's So you are destroying the transfer case and one of the rear ends. TAKE THE TIRES OFF
You are changing you ratio by .30 points So if you have 4.10 its down to 3.79 and if you have a 3.54 it.s down to 3.25 but onle on ONE axel TAKE OFF THE TIRES
You are changing you ratio by .30 points So if you have 4.10 its down to 3.79 and if you have a 3.54 it.s down to 3.25 but onle on ONE axel TAKE OFF THE TIRES
im not sure what u mean by one of the rear ends...but the differential will not be damaged as long as it has same times on each side......the front diff and rear diff are only hooked to one another when in 4wd......thats why in 4wd on pavemebt u get the hopping.....
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Joined: May 2004
Posts: 3,539
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From: Caistor Centre, ON, Canada
EZ boys....
What whitebuffalo said......Logically speaking
, the front and rear axle have NO solid attachment to each other in 2WD.....there will be no mechanical damage at all from running any variation of tire size between the front and rear since one of the specific functions of a selectable part-time transfer case is to apply a complete mechanical disconnection between the front and rear axles which will negate any possible damage as the result of running different tire sizes as long as the t-case remains in the 2WD position.
What whitebuffalo said......Logically speaking
, the front and rear axle have NO solid attachment to each other in 2WD.....there will be no mechanical damage at all from running any variation of tire size between the front and rear since one of the specific functions of a selectable part-time transfer case is to apply a complete mechanical disconnection between the front and rear axles which will negate any possible damage as the result of running different tire sizes as long as the t-case remains in the 2WD position.
Registered User
Joined: Nov 2005
Posts: 7,785
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From: Pattonville, Texas
UM - the transfer case is invisible when you're in 2WD! 
You can even get away with mismatched tires on both sides of the rear if it's open... if it's a posi, expect rapid tire wear followed soon thereafter by clutch pack meltdown/lockup (don't ask me how I know this! )
OK - since you asked...
Part 1:
Dana 80 leaked all 90W out of wasted pinon seal, w/o my knowledge.
Flat tire on a 1500 mile run, mounted spare which was 3" smaller diameter.
200 miles later - posi welds itself into one piece, emergency pitstop follows.
Truck runs great on interstate with "locker" rear diff....
100 miles later, left clutch pack lets go, enter median at 75mph
30 miles later, right clutch pack lets go, enter median (via semi-box) at 70mph
Truck drives great on interstate with OPEN diff
Replace both balded rear tires in next state with IDENTICAL tires.
Finish cross country run.
You can even get away with mismatched tires on both sides of the rear if it's open... if it's a posi, expect rapid tire wear followed soon thereafter by clutch pack meltdown/lockup (don't ask me how I know this!
)OK - since you asked...
Part 1:
Dana 80 leaked all 90W out of wasted pinon seal, w/o my knowledge.
Flat tire on a 1500 mile run, mounted spare which was 3" smaller diameter.
200 miles later - posi welds itself into one piece, emergency pitstop follows.
Truck runs great on interstate with "locker" rear diff....
100 miles later, left clutch pack lets go, enter median at 75mph
30 miles later, right clutch pack lets go, enter median (via semi-box) at 70mph
Truck drives great on interstate with OPEN diff
Replace both balded rear tires in next state with IDENTICAL tires.
Finish cross country run.
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