I'm not a mechanic but I'll learn.
Your stock bolt pattern is 5 bolt 4 inch with 7/16" lug studs. Wheel selection sucks for this.
Upgrading to M body. Diplomat / fifth ave / fury front discs puts on a 5 bolt 4.50" circle. With 1/2" lug studs. This is same pattern as the explorer rear end. Only one spare needed in trunk. And better wheel selection.
M body brake swap is easy. Pull everything from the spindle out off an M body.but leave upper and lower suspension arms behind because you cant use them. You need A body large ball joint upper control arms that use the K772 ball joint. and A body 73-76;"disc brake" lower ball joints. They did offer drums in 73 and 74. Make sure they are disc brake lower joints. Your stock lower control arms are reused. Also need 73 to 76 A body disc brake flexible front brake lines.
You also need to buy grade 8 bolts and lock nuts the size shown below. Not nylock but the squeezed ovaled lock nut. These will attach your M body spindles to the disc brake lower ball joints. M bodies use a large 2 75" piston caliper.
You can use a stock M body master cylinder with this as long as your using the 2.75" piston M body calipers. If you use smaller piston calipers the pedal effort goes up and the clamping force on the pads is decreased. If your car is manual brakes you will need to save the brake pushrod to reuse it.easy to remove, just pull the brake pedal toward you pretty firmly till the rod pulls out of the back of the old master cylinder then remove the old master cylinder. Some will say it doesnt work but the math works out. The M body is a 2 bolt master will work fine with manual brakes. You buy a 4 bolt to 2 bolt adaptor to use it. About $38 off evilbay.
With explorer rear discs you will need to buy an adjustable biasing valve and tune the fluid amount going to the back brakes.
Your stock bolt pattern is 5 bolt 4 inch with 7/16" lug studs. Wheel selection sucks for this.
Upgrading to M body. Diplomat / fifth ave / fury front discs puts on a 5 bolt 4.50" circle. With 1/2" lug studs. This is same pattern as the explorer rear end. Only one spare needed in trunk. And better wheel selection.
M body brake swap is easy. Pull everything from the spindle out off an M body.but leave upper and lower suspension arms behind because you cant use them. You need A body large ball joint upper control arms that use the K772 ball joint. and A body 73-76;"disc brake" lower ball joints. They did offer drums in 73 and 74. Make sure they are disc brake lower joints. Your stock lower control arms are reused. Also need 73 to 76 A body disc brake flexible front brake lines.
You also need to buy grade 8 bolts and lock nuts the size shown below. Not nylock but the squeezed ovaled lock nut. These will attach your M body spindles to the disc brake lower ball joints. M bodies use a large 2 75" piston caliper.
You can use a stock M body master cylinder with this as long as your using the 2.75" piston M body calipers. If you use smaller piston calipers the pedal effort goes up and the clamping force on the pads is decreased. If your car is manual brakes you will need to save the brake pushrod to reuse it.easy to remove, just pull the brake pedal toward you pretty firmly till the rod pulls out of the back of the old master cylinder then remove the old master cylinder. Some will say it doesnt work but the math works out. The M body is a 2 bolt master will work fine with manual brakes. You buy a 4 bolt to 2 bolt adaptor to use it. About $38 off evilbay.
With explorer rear discs you will need to buy an adjustable biasing valve and tune the fluid amount going to the back brakes.