1987 Diff same as 1988??
 

Pretty sure I Know the answew but I thought Id check anyway. 1987 was the last of the squares as everyone knows. Is the diff the same or close as a 1988. I can get an 1988 rear diff for 100 bucks so the price is right but not if it dont work. I need a 3:42 Posi cause mine is Hoop'd.

Re: 1987 Diff same as 1988??
 

88 is slightly longer about an inch on either side.depending on your wheel backspacing may not effect clearances usually doesent. the only thing I dont recall off hand is if you would need a different u joint. for the price might be a good option unless the new diff is a grenade lock.

Re: 1987 Diff same as 1988??
 

You may be able to swp tha whole axle, but tha posi unit won't swap...if that's what you mean...28 spline vs 30 spline..

Re: 1987 Diff same as 1988??
 

Is it from a new body style truck, or an '88 Burb? The new body style axle would need the spring perches and shock mounts cut off and welded back on in the correct spot.

Re: 1987 Diff same as 1988??
 

i have an 88 square burb ,and it's the same as my 87 burb .....not like my 89 burb the front changed

Re: 1987 Diff same as 1988??
 

Yea thought so..My 3:42 gov has seen better days and I would like to swap in a whole diff rather than tear it apart. If i cant find another what would be the way to go to get a 3:42 posi in a 10 bolt without going back to the Gov-bomb? Mayby I should look for a 3:42 Non Posi?

Re: 1987 Diff same as 1988??
 

The 87 should have a 30 spline carrier if it's original to the truck.
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Re: 1987 Diff same as 1988??
 

Yes all original..Are 3:42 non posi common to find?

Re: 1987 Diff same as 1988??
 

does anyone know?

Re: 1987 Diff same as 1988??
 

3.42 is quite common in the 88-up.
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Re: 1987 Diff same as 1988??
 

88 is 3.73
duno bout the 87