Backspacing differences between 87 and 88
Thread Starter
3rd Gear
Joined: Nov 2009
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Backspacing differences between 87 and 88
Hello everyone, I am new here. I have a question pertaining to the difference in backspacing of 84-87 and 88 up. I have looked up the part numbers on all suspension parts trying to see where the difference would be. All the spindles, knuckles and links for the suspension are the same from 84-96, as well as the the hubs. So my question is, what gives the 88 up the 56mm backspacing it requires?
Team Owner
Joined: Dec 1999
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From: Lacey WA RVN 68-69
NCM Sinkhole Donor
I think the difference is in the length of the upper and lower control arms. There were suspension changes beginning in 88. The front shocks were a one-year difference too.
There are differences in the hubs between the early and late cars. Mostly in how the spindle attaches within the hub and some other differences in the design and placement of the reluctor ring for the VSS.
BTW, the diffenece in measurement for the wheels is offset, not backspacing.
There are differences in the hubs between the early and late cars. Mostly in how the spindle attaches within the hub and some other differences in the design and placement of the reluctor ring for the VSS.
BTW, the diffenece in measurement for the wheels is offset, not backspacing.
Team Owner
Joined: Sep 2003
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Hello everyone, I am new here. I have a question pertaining to the difference in backspacing of 84-87 and 88 up. I have looked up the part numbers on all suspension parts trying to see where the difference would be. All the spindles, knuckles and links for the suspension are the same from 84-96, as well as the the hubs. So my question is, what gives the 88 up the 56mm backspacing it requires?
Your "research" is flawed! Suspension and brake components are '84-'87 and '88+ with very few "exceptions". Hubs/bearings aren't all "the same" either!
Are you shopping for wheels?
Last edited by WVZR-1; Dec 23, 2009 at 08:42 PM.
Le Mans Master
Joined: Aug 2000
Posts: 8,838
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From: Australia
The '88+ setup has a different knuckle ( shock mount / angle is different for one) with a longer outer yoke and a seperate "spacer" that serves as the brake caliper mount.This puts the hub face ( same hub; 84 -96 ) approx 3/4" further out from the early cars; hense the difference in BS early vs late
Thread Starter
3rd Gear
Joined: Nov 2009
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I have gone through Ecklers and Midwest, both show no differences in part numbers for those parts.
WVZR-1: I just bought a 88 parts car, and was going to swap out the parts I need so I can get rid of the wheel spacers I have to use with the 99 c5 rims I have.
WVZR-1: I just bought a 88 parts car, and was going to swap out the parts I need so I can get rid of the wheel spacers I have to use with the 99 c5 rims I have.
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
Early vs late shock angle ( early on left ) Note the thick caliper mount on the '88+ requiring the use of the longer yokes as shown in post above?
Park brake arrangement is different
Last edited by rodj; Dec 24, 2009 at 02:49 AM.
