3/4 Ton Suburban rear end interchange

[poncho-mike]

I've got a 78 3/4 ton Suburban with a 14-bolt full float rear end.

I've read in the interchange manuals that 74-87 Chevy truck rears will interchange. I've been told that the early 90s 14-bolt full float rear ends will fit with minimal modifications.

What do I have to do to put a 92 14-bolt FF in my 78? It it just a matter of moving the spring perches, or do I have to move the shock mounts to?

Mike

[trkklr77]

why would you want a 92 ff, it the same as the one you have????

always check the perch widths, 3/4t and 1t are different.


if all you want is the gears just swap those, it super easy with 14ff

[poncho-mike]

The Suburban is just a tow vehicle. I'm trying to go to a numerically lower gear ratio for a little better gas mileage. I can't have it torn down in my driveway for a couple of weeks while I rebuild my current rear with new gears. I don't have the time to figure out how to rebuild it myself.

I found a 92 FF rear with 3.42 gears and I want to know what I need to change to make it fit.

Mike

[trkklr77]

CHECK THE PERCH WIDTHS and if they match bolt it in, they should.


it will take you 5 hours at the most to swap a 14ff gear set. they are not like others with pain in the ass pinion nuts and tight ass side shims. simply undo the 6 bolts holding the pinion stock in place, remove diff by unscrewing side adjusters, swap all of said parts into yours, tighten and paint till your happy.

[KWTMECH]

CHECK THE PERCH WIDTHS and if they match bolt it in, they should.


it will take you 5 hours at the most to swap a 14ff gear set.


Holy crap! Took me 45 minutes last saturday to do my dually from 3.73 to 4.56
















Of course over the years I have set up probably close to a thousand gears:)