can 90s up truck 8.5/30 spline posi be made to fit into 77 8.5/28?

[fstarocka]

Can i use the posi units from 90s up truck (not gov loc!!) and put in my 77 camaro 8.5/28?

I dont mind if I have to buy aftermarket 30 spline axles to match the 30 spline truck posi's..

or CAN I swap the spider gears - ie remvoe the posi unit from the carrier? ( i have a shop ) -

just want to know tx.

 

[badazz81z28]

The 8.6 rearend differential will fit the 8.5

 

[camaro71/holland]

Yes, but you will need different bearings due to larger ID of the flange. Don't know about changing the spider gears, but don't think that will work.

 

[big gear head]

If it's a Gov Lock then don't bother. If it's an after market unit like a Eaton Posi or Truetrac then yes, but you will need special bearings. If it's a '98 or older unit installed by GM then it will use the same bearings as your 28 spline unit, but all of the GM installed units were the Gov Lock. The bearing size was changed in '99.

 

[fstarocka]

yes avoiding the g80 at all cost.. bearings aren't an issue.. what posits did the non g80 differentials come with, like make and year?

Set of moser 30spline axles are 145 at summit .. if I can snag a posi and get those I'll be stoked..

 

[fstarocka]

yes avoiding the g80 at all cost.. bearings aren't an issue.. what posits did the non g80 differentials come with, like make and year?

Set of moser 30spline axles are 145 at summit .. if I can snag a posi and get those I'll be stoked..

 

[big gear head]

G80 is not a differential. G80 is the code that GM used for all limited slip differentials. In the trucks G80 is the Eaton Governor Lock. In the '60s Chevys G80 is the Eaton Posi. In the 2nd gen Camaros G80 is either the Auburn or Traction Lock. In the 3rd gen Camaro G80 is the Auburn. Calling a differential G80 can mean many things.

 

[fstarocka]

G80 is not a differential. G80 is the code that GM used for all limited slip differentials.

Apologies - yes, im curious what type of posi units came stock in 99 and up trucks (8.6/30 spline)?

Im not considering the auburn or gov loc types-

 

[big gear head]

Trucks got the Gov Lock.