very noob question, and I searched but didn't find a clear enough answer.....

Do front and rear diffs have to be geared the same? I have an '85 and I just bought a 2nd hand 4.88 rear 3rd with a Detroit soft locker. Do I need to get another 4.88 for the front before I can use the 4WD?

Sorry if this is a really novice question, but I appreciate any advice you can offer.

 

Yes they do, otherwise the drivetrain will spin at a different speed and try to fight itself, resulting in bucking and drivetrain damage.

 

if you decide to run different gears you will ruin your drivetrain. end of story.

dont even try it

 

Thanks.