September 6, 2006Iam swapping my OG rearend on my 59chevy truck . Iam looking at putting 20" x 10 ...5x4.5 in. bolt circle and 255/35-R20 tires. I own a ford 9" and not really sure what step i should take next.
September 7, 2006Hey Dud, been down this road a couple of times myself. On one hand, the answer is simple, on another it is complicated. If you are trying to keep the truck together and running until the rear end is needed, this will be a bit more complicated.
The thing to do is to mount your tires onto the wheels. Then, with the stock rear end out of the way, position the wheels under the truck at the desired width. This may require tubbing the bed, but I recall these Chevys have a lot of wheel/tire room. Once you have established tire clearance for the outside of the wheel/tire combo, simply measure from the backside to backside of both wheels. That will be the ideal rear end width. Next, have a race shop narrow both the rear end housing and axles (as they will have to be cut and re-splined).
I have seen this done economically by using an off-set 9-inch Ford housing. Eliminate the long tube, then install another short tube and matching short axle. Cuts down on welding and machine work, but will require more salvage yard expeditions.
September 10, 2006Excellent answer Steve! We have all seen vehicles that have narrowed the rearend too narrow for the tires/wheels they are running. From the back it looks like it will tip over.
Why the 4 1/2" bolt pattern, other than that is what is on the 9" rear? Most GM owners want the 4 3/4" or 5" bolt GM patterns. If you put a Mustang II on the front, any of these patterns are available.
September 10, 2006Thanks for the replies they have been of great use. Iam slowly trying to put my project togther its my first build and all tips help. I love what you guys have done with your ford hotrods there awesome.