The IFS was from an '87 3/4-ton Suburban but would be basically the same as any '71 to '87 3/4-ton Chevy or GMC pickup and a few more years in Suburbans.

It was NOT narrowed and the wheels did not stick out from under the fenders. However this truck is a dually and he has dually type wheels on the front of it.

I put some pictures on my web site. '53 Chevy 1-ton dually with IFS conversion

For a time in the late 80's and 90's GM produced 3/4-ton pickups with 6-lug rears, but they are not full float so they aren't the best option for heavy loads or towing either one. I don't know if they had disk brakes and now that you ask I don't even know if the '91 I have has rear disk or not.

What wheels and tires do you want to run? You may find that a slightly different axle width will be best with your preferred wheels and tires.

1955 1st GMC Suburban | 1954 GMC 250 trailer puller project | 1954 GMC 250 Hydra-Matic | 1954 Chevy 3100 . 1947 Chevy COE | and more...
It's true. I really don't do anything but browse the Internet looking for trouble...