Rebuilt tranny and found rear spring issues - ZR-1 Net Registry Forums

JSad · 11-01-2020

When I bought my white 1991 ZR-1 #210 a couple years ago it was a rescue of a pretty abused car. It was running and drivable when I bought it but needs much TLC. I am slowly getting it back into shape. Engine work is done (stock) and I have completed some other miscellaneous issues. One of the problems was the syncros 1st to 2nd.

I just had the transmission rebuilt by the local shop I use, Pinnacle Performance. They did a fantastic job on the rebuild and I had them do the rear main seal, new clutch, fidenza flywheel, add ZF Docs short shifter and beam plates, then replaced the resonator with an x-pipe and added Haibeck's chip.

Love the results...but...as I was crawling around underneath admiring the work, I noticed my rear spring is cracked and delaminating. So, next project is to replace it. My questions are, does someone offer a "kit" with everything I need, and what else should/could I do while replacing it?

Z51JEFF · 11-01-2020

I'd just look for a nice used part, it sure you can buy a new one.

Hib Halverson · 11-08-2020

You need a rear spring and the one you want will be labeled and likely stamped with the spring code: NYR.

At this point in time, it's unlikely, but not impossible, that you're going to find a new spring. Looking for a good used part is what you may end-up doing.

There are a lot of NYR springs out there because it fits:

85-93 base coupes
89-90 coupes w FE7 and FX3
90-91 ZR1

Good luck!

JSad · 11-08-2020

What's your thoughts on the composite replacement sprongs, like those from Ecklers or similar?

11-01-2020	#1
JSad Join Date: Aug 2018 Location: Tulsa Posts: 43	Rebuilt tranny and found rear spring issues When I bought my white 1991 ZR-1 #210 a couple years ago it was a rescue of a pretty abused car. It was running and drivable when I bought it but needs much TLC. I am slowly getting it back into shape. Engine work is done (stock) and I have completed some other miscellaneous issues. One of the problems was the syncros 1st to 2nd. I just had the transmission rebuilt by the local shop I use, Pinnacle Performance. They did a fantastic job on the rebuild and I had them do the rear main seal, new clutch, fidenza flywheel, add ZF Docs short shifter and beam plates, then replaced the resonator with an x-pipe and added Haibeck's chip. Love the results...but...as I was crawling around underneath admiring the work, I noticed my rear spring is cracked and delaminating. So, next project is to replace it. My questions are, does someone offer a "kit" with everything I need, and what else should/could I do while replacing it?

11-08-2020	#3
Hib Halverson Join Date: Jun 2005 Location: CenCoast California Posts: 899	Re: Rebuilt tranny and found rear spring issues You need a rear spring and the one you want will be labeled and likely stamped with the spring code: NYR. At this point in time, it's unlikely, but not impossible, that you're going to find a new spring. Looking for a good used part is what you may end-up doing. There are a lot of NYR springs out there because it fits: 85-93 base coupes 89-90 coupes w FE7 and FX3 90-91 ZR1 Good luck! __________________ Hib Halverson Technical Writer former owner 95 VIN 0140 current owner 19 VIN 1878

11-08-2020	#4
JSad Join Date: Aug 2018 Location: Tulsa Posts: 43	Re: Rebuilt tranny and found rear spring issues What's your thoughts on the composite replacement sprongs, like those from Ecklers or similar?

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11-01-2020	#2
Z51JEFF Join Date: Dec 2007 Location: Fremont,Ca Posts: 3,079	Re: Rebuilt tranny and found rear spring issues I'd just look for a nice used part, it sure you can buy a new one.