I have 900/20's on my G506 but they are on a wider rim. I do have a spare with a 900 on an original 6" rim so it can be done but you can see the the profile is wrong because the 6" rim sucks the bead section in too much.

I'm saving up (cost more than the truck did) for the 750/20 NDT's to put on the correct six inch wide rims I bought. I don't like the final drive ratio (too tall) with the 900 tires and also at full lock my left front tire rubs on the drag link because of its wider than stock width.I put a bigger 261 six in my truck to handle the taller ratio but all in all I think the truck and myself will be happier with 750's on it and I agree 45 mph in a 506 feels like 145 mph in most anything else, LMAO!

Last edited by sleeve; 06/29/2012 1:55 PM.

1945 Chevrolet G 506 1.5 Ton Military 4X4
1967 Jeep Cj5 with 283 SBC