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Bolt pattern for a 1985 GMC Sierra Classic 1500 is 6x5.5 (That is what mine is)
6x5.5
A 700R4 will bolt right in. A 350 Turbo or 400 Turbo will also bolt right in but you will have to change the drive shaft.
6x5.5
6 x 5.5
six on 5.5 chipc@kovach.net
4.52" backspacing -12mm offset 16X7 6 on 139mm bolt pattern
2wd is 5 x 127mm and 4wd is 6 x 139.7mm
YES, There the same engines. It will be a direct bolt in.
The 1987 Caprice Classic takes a 205 75-15 sized tire. The bolt pattern on this car is 5 by 120.7 with low offset.
1987 CHEVROLET CAPRICE Factory Tire Size: 205/75-15 | Factory Bolt Pattern: 5x120.7 | Hub: 70.3 | Offset: LOW | Lug: 7/16"
6x137.5