Z-11 get a good plug

[models916]

Why does it say SPECIAL posi rear end? What was different about the Z-11 rear end?

http://www.classicshoptalk.com/content/1436-1963-chevrolet-impala-z-11.html

 

[Tom Kochtanek]

Might be referring to the "four link" setup?

I'm not a Z-11 expert by any stretch of the imagination, but I bet Phil knows .

Best,
TomK

 

[region rat]

Might have been bigger axles and spiders. They would have puked the stock stuff before they left the line.

 

[MRHP]

I have heard the axle/spider gear story.

 

[Ishiftem]

I have also heard about them having different spiders and axles.

 

[Phil Reed]

The only thing different was the spider gears and axles. You could not order either of those parts without a VIN so Chevy could make sure that they only went back into real Z11 cars. I have also heard the Corvettes had the fine spline spider gears. I have a set of them that I have had for years. Gotta be pretty rare I would think.

 

[models916]

Phil, have you ever compared them to the Dana fine spline spiders?

 

[oldskydog]

When I found my 61 409 block, the guy had a lot of racing parts including a MT crossram and some NOS cams in the tube. He also had a box of posi parts. I went through them looking for spiders and side gears. The side gears were all 19 spline instead of 17 so I passed. Did I make a mistake?

 

[Phil Reed]

Mine are 20 splines. I'll try to post a picture later.

 

[region rat]

Did they all have the extra upper link? I remmeber looking under one and it did not. How many splines did the 8 3/4 Mopar have?

 

[MRHP]

Mopar 8 3/4 is 30 spline. Early dana 44 with a powerlok reat diff I think is 19. Either of those spiders will fit a factory 8.2 posi case.

 

[region rat]

I think one of those is what Aubrey uses to beef up a stocker.

 

[MRHP]

That would be the 30 spline 8 3/4 or the later dana 44 style.