David - the interchangability on 8 3/4 rear ends is from 58 to 74 (or
whenever they quit using them - I think it was immediately after Chrysler
solved the short-life problem of the axle bearings!). Anyway, in regards
to your specific question, I do not know if the sure-grip for 56 is the
same as 58 thru 68 or not. I do know that you can use any sure-grip unit
for the 8 3/4 from 58 up (with the appropriate side bearings.) Check the
part #'s for the diff side bearings and see if they list the same for 56
and 58 - if so, they might interchange, but I don't know about the axle
spline count either, 'course you might be able to swap the side gears. I
do know that the housings (pig, pumpkin, 3rd member - or whatever you want
to call it) are different in 57 & down. Don't know if it was called an "8
3/4" or not, don't know if it WAS an 8 3/4 or not. Guess I don't know much
at all about 57 & downs diffs! Hope this .002 worth helps some anyway.
DaveG.
----------
> From: David Homstad <dhomstad@xxxxxxxxxxxxxxx>
> To: L-FORWARDLOOK@xxxxxxxxxxxxx
> Subject: Re: [FWDLK] "Posi" Rear End?
> Date: Wednesday, February 03, 1999 7:42 PM
>
> Mike,
>
> If I remember right, the first year for "Sure-Grip" was 1958. There was
also
> a disk brake option on Imperials in the mid 50's. Does anyone know if a
late
> 60's 8 3/4 "Sure-Grip" package will fit into a 56 Dodge 8 3/4?
>
> Dave Homstad
> 56 Dodge D500
> ------------------------------------------------------------------
> At 11:40 AM 2/3/99 -0800, you wrote:
> >s scott <kneedrager@xxxxxxxxxxx> wrote on Wednesday February 3, 1999
> >at 6:24am:
> >
> >
> >>Also I think that "posi" is a GM term and "limited slip" is the Mopar
> >>term for the same thing, can anyone set me straight on this.
> >
> >"Posi", or "Positraction", is specifically a Ch#vy term; other GM
> >divisions originally used other names. (I believe P#nt@*c used
> >"Safe-T-Track"; don't remember the others.) GM didn't even have it
> >first! That honor goes to Packard, who called it "Twin Traction"...
> >
> >The MoPar Madison Avenue name for a limited slip differential (correct
> >technical term regardless of manufacturer) is "Sure-Grip".
> >
> >Mike Sealey
> >
>
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> Dave
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