Turbo'd s.b. chev...in a 69 Camaro? maybe?

[Jim Davies]

On Wed, 2 Jun 1999, Todd....!! wrote:

> Is the Dana 60 considered a Sure Grip?  Or just a posi?
> 
> Don't know what to call it, now that I think about it, anybody?
> 
Older 60s used an Eaton PowrLok [2 piece case] later ones used a Trac-Lok
[one piece case, no ramps]

Older 8 3/4s used a PowrLok. In 1968-9 they started using the Borg-Warner
Spin-resistant [cone-type]

Older [50s-60s] GMs used the Powr-Lok also

Olds used the spin-resistant in the late 60s

Ford 8 3/4-9-9 3/8 inch dropouts used a small, plate type LSD called an
Equalock [aka Equapop] which, due to the small available diff size, was
never used with 427s. The cars came with a 4 pinion open diff and a
no-spin could be installed at the dealer or  elsewhere. 

All of the above [except the no-spin] are limited slips, with a plethora
of marketing names, like 'positraction' 'safe-t-track' 'sure-grip' etc
etc.

Just think of a conventional differential, with a bit of friction between
each axle shaft and the diff case added. Breakaway torques are in the area
of 30 to 250 ft lbs. Once you exceed the breakaway torque, they act like a
conventional diff. The breakaway torque varies a lot between individual
samples of identical units.

The Powr-Lok has a 'feedback' capability making it more desireable, and
more expensive to mfr. Obsolete. It was the best of the plate types, IMO.

Oh, yeah. There is no more good posi lube available, complicating things.