Yes. GM has used the same 8x 6 1/2 bolt pattern on 3/4 and 1 tons (exept for some light duty 3/4 tons and extra heavy duty 1 tons) since '47. However, after '88 (91 on some models), 4x4 models use a different backspace, and are not compatible with the earlier trucks. 2wd changed to the same backspace as the 4x4 after '99 on 1/2 tons, 2000 on 3/4 and 1 ton.
