[WVZR-1]

Originally Posted by secondchance

Are early (90-92?) and later (93-95) leaf spring rates the same and interchangeable?
I am dropping the car height a bit so I picked up a front spring from another WAZOO member and glued on the wedges. However, Phil noticed end plates (both ends where it sits above the lower A arms) are a bit diffrent from the later cars.
So 2 questions - any rate difference? Will the ends work with a 94?

Thanks.

The springs are assembled differently on the control-arm ends. Your springs should have had a 1 1/4" square pedestal so to speak rather than just the rubber molded insulator like the '91 that you purchased.

You should have no issues. If the heights are different in the FSM then there will be differences.

Forgot I have a '94 FSM so:

I checked a '91 FSM and a '94 FSM and the datum line measurements are different with the '91 being less. I checked the reference for C height. Now the image is a bit different but certainly the point isn't. Look at 10-3-2 or 3 in your FSM and look at the datum heights. A '91 @ C is 177mm and a '94 @ C is 192mm. That's pretty close to the difference in the spring height for the two. You might end up a little lower than you intended!

Originally Posted by secondchance

Good thing I checked this.
91 sping for ZR-1 is 96.2 N/mm (548 lbs/inch) -front and 39.9 N/mm (228 lbs/inch) - rear.
92 and later are 75.4 (430 lbs/inch) and 33 (188 lbs/inch) respectively.

I'm gonna have to remove my front, shave off the factory bumpers and reglue lowering wedges.

I would be tempted to use the '91 if time and the aggravation doesn't bother you should you need to redo the procedure later. I'd think the increased spring rate maybe a +.