I've got 2 83 Z28s, one with drums, one with discs. Both are 10 bolt rears, posi, 3:23 rears. The disc car is likely going to get stripped and crushed, so I can use that rear to swap into my drum car, or I can buy a later-model 3rd gen rear that's already done. Which alternative is best, and why?

From what I understand, the prop valve is different for 82-83 disc cars. Also, looking in Classic Industries catalog, they don't list a new stainless brake line for 83 Zs with 4 wheel disc, just 82s. I'd rather find a used/rebuilt rear in the classifieds or something like that, but I'm concerned that the differences in lines, calipers, etc...would keep it from being a bolt-in deal. Can anyone clarify for me?

 

82-83 and some early 84s use SAE threads, everything after is metric.

 

You mean the threads on the brake lines?

 

All the lines and hoses, yes.

 

From an interchange standpoint, it's probably best to use the other 83 axle I have, then. Are there any downsides to doing so? I thought there were problems with the calipers and such.

Also, does anyone know if a stainless rear brake line (not the hose, the line) is available for the 83 4w disc cars?

 

http://www.classictube.com
http://www.finelinesinc.com

Try these guys... they might not list an 82-83 in the catalog, but if you ask them, they could probably flare the lines however you like.

 

Thank you.

I've got another question...instead of swapping factory prop valves, can I leave the existing disc/drum prop valve and plumb in an adjustable prop valve from Summit or someone?

Any other thoughts on which axle to use? 10 bolt or 9? 82-83 or 84-up?

 

You could eliminate the prop valve and use an adjustable one.

I'd use a 10 bolt, preferrably from a 90-92 car with 28 spline axles. 9 bolts are nice, but it's too hard to find parts.

 

Any idea what the downsides are to using the 83 setup I've got?

 

If it all works, then none really.