ZR-1 Net Registry Forums - View Single Post

aafc · 06-06-2011

Marc,
My ZR-1 is a 1990 #2546,and i have the build sheet. ON it it shows that the front
spring is code AA and the rear spring is code NYR.I known the rear spring code is correct
because i have removed it to service the rear.After 20 years and 112xxx miles the posi went out.So as long as the rear came out for service i' ll rpl the stock gears 3.45 with 3.73 and install a lighter spring 228 lbs(new). that way i'll the spring i want.
I also was told not to use an old spring as it could crack because of (age ,weak or not as strong ).

thanks
John Becker member #0115
1990 white/black #2546
one of a few auto (4l80e) eq ZR-1's

06-06-2011	#4
aafc Join Date: Feb 2010 Location: Summerfield, FL Posts: 434	Re: help with rear springs codes Marc, My ZR-1 is a 1990 #2546,and i have the build sheet. ON it it shows that the front spring is code AA and the rear spring is code NYR.I known the rear spring code is correct because i have removed it to service the rear.After 20 years and 112xxx miles the posi went out.So as long as the rear came out for service i' ll rpl the stock gears 3.45 with 3.73 and install a lighter spring 228 lbs(new). that way i'll the spring i want. I also was told not to use an old spring as it could crack because of (age ,weak or not as strong ). thanks John Becker member #0115 1990 white/black #2546 one of a few auto (4l80e) eq ZR-1's