GM G80 "Gov-Lock" fun-time mods

[olds307 and 403]

My personal experience with a Gov Lock is the cases are fragile if the tires hook or they are shocked.

Nearly any 7.5" diffs are including the Powertrax rears. Just too small to hold up to power.

 

[gnvair]

Nearly any 7.5" diffs are including the Powertrax rears. Just too small to hold up to power.

My pictures are from an 8.5 10 bolt truck.

 

[olds307 and 403]

My pictures are from an 8.5 10 bolt truck.

Yikes!

 

[gnvair]

I replaced it with a conventional Eaton clutch style posi unit similar to the OEM units GM used on the passenger car 12 bolts and the 71-81 F body and 84-87 G body 8.5

 

[08Malibu]

I blew the one up in my 05 Sierra with a stock 5.3. I hit a pot hole under full throttle. Broke one of the spider gears I half.

 

[pontiacgp]

I replaced it with a conventional Eaton clutch style posi unit similar to the OEM units GM used on the passenger car 12 bolts and the 71-81 F body and 84-87 G body 8.5

The Eaton clutch posi I have in my 1967 8.2 rear still has the original clutch packs in it and still working fine. I know they are the originals cause when I got the rear end I checked the thrust washers on the pinion gears. There was a builliten on the thrust washers that they would wear out prematurely due to the material they were made of. The posi still had the original thrust washers in it and they were paper thin so that means the rear was never opened.

 

[KCP]

I had the gov lock in a couple of Blazers and loved them for mild wheeling. Way better grip than a conventional LSD rear. For a street vehicle I'd go torsen type differential over a LSD anytime.

 

[Supercharged111]

My pictures are from an 8.5 10 bolt truck.

The 8.5 crap breaks in the trucks all the time too. I'd argue 9.5 and bigger is where they're decent. That said, mine is pretty wallered out but still works. . .that also said it probably has 300k on it by now as it was plucked from the junkyard north of 200k when my truck was at 200k.