Rear end question

Blackheart4355 · Poncho Master!

Rear end question

4SPEED427 · A Poncho Legend!

Have you ordered your GM documents? It shows on there.

If not, then look for a little metal tag under one cover bolt and/or a red plastic tag on the filler plug which is on the driver's side of the centre section, in front of the axle tube.

As far as it being a posi, check on the underside of your trunklid for a rectangular yellow label, or evidence (glue residue) that there was a label like that at one time. I think the jacking instruction label is pretty much square, this label is a rectangle about 2" X 4".

And to finally answer your question, it's totally hit and miss. I've likely owned more big blocks without posi than with. Of course, most of the time the sellers told me it had a posi because it was a big block car, which is totally false.

Blackheart4355 · Poncho Master!

Thanks Carl,

well..there was no metal tag attached to any of the cover bolts...will have to look for the red plastic tag. As the car has been repainted, there is no stickers...

4SPEED427 · A Poncho Legend!

If you feel like getting dirty, you can get the code off the axle tube.

Passenger side, front of the tube, close to where the tube goes into the centre section casting. You'll find some numbers and letters there but likely you'll need a steel brush or a wire wheel on some kind of high speed power tool to buff it all off. You don't have to worry about destroying the stamping, it's stamped deep in to the tube. Those numbers give the build date, axle ratio and identify posi/non-posi.

67curves · Addicted!

Carl Stevenson wrote:
Have you ordered your GM documents? It shows on there.

If not, then look for a little metal tag under one cover bolt and/or a red plastic tag on the filler plug which is on the driver's side of the centre section, in front of the axle tube.

As far as it being a posi, check on the underside of your trunklid for a rectangular yellow label, or evidence (glue residue) that there was a label like that at one time. I think the jacking instruction label is pretty much square, this label is a rectangle about 2" X 4".

And to finally answer your question, it's totally hit and miss. I've likely owned more big blocks without posi than with. Of course, most of the time the sellers told me it had a posi because it was a big block car, which is totally false.

This is correct about hit and miss. I have 2 big block cars , same year same engine , same trans, but one is posi other is not.

4SPEED427 · A Poncho Legend!

I agree with the logic, that much power should have had a posi as standard equipment. However, I'm sure it was done to keep the cost of a vehicle down.

65Camino · Uber Guru

Why not just lift the whole rear end and spin the tires? If they both spin the same direction posi, not the same way non posi?

Pontiacanada · A Poncho Legend!

Carl Stevenson wrote:
As far as it being a posi, check on the underside of your trunklid for a rectangular yellow label, or evidence (glue residue) that there was a label like that at one time. I think the jacking instruction label is pretty much square, this label is a rectangle about 2" X 4".