Caliper Clearance + Tire Question
I would like to run a 275/60-15
To run this on a 15x8/4.0bs on a 4.5 bolt-circle,you will not (I don't think), have to install the offset kit. To use re-splined NON-A-body axles, you would have to (with drum brakes), run Non-A-body backing plates which would move the flanges to the outboard about 3/8 inch. Aaaad that will probably put 275s into the outter lips.
Before you attempt to use the A-body axles just redrilled for 4.5 bolt circle, you will see that that there is almost nothing left to support the studs.
If you attempt to convert this A-body rear system to Disc brakes, I can almost guarantee that you will have to narrow the entire thing to use those 4.0bs wheels.
I don't understand why you would want to go to all that trouble, and then run skinny fronts which you would then HAVE to limit the rear brake pressure for.
On the street with street tires, you will never be able to run the rears at same pressure as the fronts, unless perhaps the rear discs are very tiny.
275/60-15s are about 28" tall. If you are able to install them in the proper place inside the tubs,transversely, you will find that you only have about .25 inch clearance to the body, in the vicinity of the front perches. Meaning, when you take off hard or brake hard, the tires will want to get into the body at that location. Therefore, you will need to either move the entire rearend back, or cut the sheet metal. You need a minimum of about .5 inch in that location.
Again, IMO, on the street, converting to REAR disc brakes is a total waste of time and money.
If you just WANT to have DBs back there, for wanting sake, I got no argument against that,lol. But in that case, I would highly recommend what others have done, namely installed an 8.8 Explorer rear end in there.
They say,
and I cannot verify,
that the Explorer rear comes with good sized discs already on it, and is the right width to start with. So all you gotta do is cut the Ford junk off, center it up in your body, set the pinion angle, and weld the new perches on.
And the whole thing is already engineered for you, and is cheap. Case closed. You will still have to sort the brake pressures out yourself, that's it. Well that and the parking brake system,lol.
