Wheel spacers
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Joined: Jan 2022
Posts: 25
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Car: 1985 IROC Z
Engine: 305 TPI
Transmission: 700r4
Axle/Gears: 3.42
Wheel spacers
I've got a 1985 IROC and the other day I pulled all the wheels off just to clean and polish. Then I noticed a small (1/4 inch) wheel spacer on both sides of the rear axle. Is this a factory thing or did someone along the way decide they wanted a different offset in the rear?
Joined: Oct 2002
Posts: 2,678
Likes: 1,267
From: In the paint booth!
Car: 1986 Camaro Drag Car
Engine: 383 on Ethanol
Transmission: Automatic
Axle/Gears: 4.86 Currie 9 inch
Re: Wheel spacers
I've got a 1985 IROC and the other day I pulled all the wheels off just to clean and polish. Then I noticed a small (1/4 inch) wheel spacer on both sides of the rear axle. Is this a factory thing or did someone along the way decide they wanted a different offset in the rear?
Joined: Aug 1999
Posts: 19,282
Likes: 103
From: Lawrence, KS
Car: Met. Silver 85 IROC/Sold
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's
Re: Wheel spacers
Why Does My Rear Have Spacers?
The spacer was apparently used on 16" wheels when GM switched from aluminum to iron drums, which created a .187 size difference. The spacer, however, seems to be hit or miss and essentially unnecessary. Even some disc brake cars received them. Mine did.
JamesC
The spacer was apparently used on 16" wheels when GM switched from aluminum to iron drums, which created a .187 size difference. The spacer, however, seems to be hit or miss and essentially unnecessary. Even some disc brake cars received them. Mine did.
JamesC
Joined: Oct 2001
Posts: 12,228
Likes: 1,156
From: Il
Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: Wheel spacers
Iirc, it has "GM" stamped on it if its factory.
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