"Z" and "D" dimension question for my '72

[Tom L.]

My car sits low, too low. While I like the way it looks, the ride height had become problematic. I took time today to measure he Z and D dimensions and compared them to the numbers in the AIM. Before I comment, should I be using the dimensions in the chart listed under "Models" or "Curb". Thanks!

[Duke W.]

Re: "Z" and "D" dimension question for my '72

I don't have any '72 documentation, but in GM-speak "curb weight" is with all normal equipment including spare tire, jack, and tools, full fluids including fuel, but no passengers or cargo.

"Design weight" is essentially GVW, which would add about 400-500 pounds to curb weight for two people and cargo. I don't know what is meant by "models", but you should probably be comparing your Z and D dimensions with GM's spec for curb weight.

Duke

[Tom L.]

Re: "Z" and "D" dimension question for my '72



Attached is the sheet from my AIM that I'm asking about. before I move forward with finding a solution to my ride height issue I just want to confirm that I'm using the correct measurements. From what I understand, I should be using the "Curb" portion of the chart. So, for example, the Z dimension for my '72 coupe w/ std suspension should be 2.45". NOT 2.03" as noted in the portion of the chart under "Models". Simple question, just confirming. Thanks!!

[Duke W.]

Re: "Z" and "D" dimension question for my '72

As I said before the "design" values are for a fully loaded vehicle - essentially GVW. (Note that they are less than "curb".) The "curb" settings are full fluids including fuel and all normal equipment including spare tire and jack. Use the curb values specified for you body style i.e. "model" (coupe or convert.) and suspension, either base or F-41, whichever your car has.