81 burb rear end to a 72 jimmy?

[hjalbert3]

anyone know if a 1/2 ton 4x4 81 burb rear end will fit a 72 jimmy 4x4 ? Im wondering about the spring perches and the shock mounts. the ratios are the same, and they are both 12 bolts, thanks hj

 

[Beast388]

Not without some modification. The '81 axle has shock tabs that are on opposite sides. The shocks on your '72 both mount on the front of the axle. The spacing is different too.

The spring perches are different as well. The '81 axle will have a center to center distance of 42.5" Your '72's distance is 40". Time to break out the torch and welder. /forums/images/graemlins/grind.gif /forums/images/graemlins/weld.gif /forums/images/graemlins/hack.gif /forums/images/graemlins/waytogo.gif

 

[bigyellowjimmy]

Also wouldnt the 81 Burb rear diff be a 10 bolt?

BTW a 2nd Gen SRW 1 ton will bolt right in but you will have to still move the one shock mount to the front of the axle tube /forums/images/graemlins/thumb.gif

 

[BlazerGuy]

[ QUOTE ]
Also wouldnt the 81 Burb rear diff be a 10 bolt?


[/ QUOTE ]

GM started to phase out the 12b rears in early 80's so you could see a '80 with a 10b rear or a '84 with a 12b rear. There wasn't a clear cut date when they switched over...

 

[bigyellowjimmy]

[ QUOTE ]
GM started to phase out the 12b rears in early 80's so you could see a '80 with a 10b rear or a '84 with a 12b rear. There wasn't a clear cut date when they switched over...

[/ QUOTE ]

/forums/images/graemlins/thumb.gif

 

[pauly383]

[ QUOTE ]
There wasn't a clear cut date when they switched over...


[/ QUOTE ]

Very rare for a 12bolt after 81 though /forums/images/graemlins/k5.gif