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Need Backpacking help with 12 bolt

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01-18-2017, 07:29 PM

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Car: 1987 IROC-Z

Engine: TPIS II Supercharged w/Nitrous

Transmission: 700R4 Probuilt

Axle/Gears: 3:73 Richmond 12 Bolt

Need Backpacking help with 12 bolt

Have a 1987 IROC and will be putting in a replacement 12 bolt Spicer or Moser with coil-overs. I will be getting rid of the stock 16' rims and wanting to put 15 x 10.5 ... I need help with the back spacing , I'm guessing it's 4 ½ inches but need exactly. Any help would be appreciated

These are the rims i would like to use

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01-18-2017, 08:25 PM

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Car: 86 Trans Am, 92 Firebird

Engine: 408 sbc, 3.1L of raw power

Transmission: TKO600, T5

Axle/Gears: Moser 9", 3:70 trutac, 3:23 torsion

Re: Need Backpacking help with 12 bolt

On a stock.width rear 5.5" on a 10" wheel.kinda fits.. 6" is better but is hard to find 6.5 is best but requires metal work to.properly fit

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