1/2 ton to 3/4 ton backing plate??

[84 400]

The conflicting info on this is crazy!!

I have searched disc diameter and the 1/2 ton is roughly 11 3/4 and the 3/4 is 12 1/2. Do any of the half ton backing plates work for the 3/4 ton swap?? Some say no some say yes. The calipers are the same p/n.

Peterson's did an article and said you can reuse the backing plates. I will link it below. My 77 has mint backing plates I would like to reuse if possible.

Any input would help

Link to one article claiming you can reuse the 1/2 stuff
http://www.4wheeloffroad.com/howto/3084/photo_08.html

[DirtyLarry]

If you are talking about the front brake backing plates on D44’s or Corp 10 bolts, yes….you must replace the backing plates to the larger ¾ ton type as they are larger in diameter. The 6 lug ½ rotor is 11.86 in diameter while the 8 lug ¾ ton rotor is 12.5. You’re probably thinking of brake calipers as those you do not need to change. Both ½ ton & ¾ ton use the same calipers

This wouldn't be the first time the 4x4 rags have been wrong.

[84 400]

Thanks. Love your rig btw.
after reading the size charts I thought there was no way it could work.

Does anyone know the GM part number?? Apparently you can still buy them new....

[obijuan]

supposedly 3/4 ton calipers are different piston something or other this and that. dimensionally identical to each other.

i have seen half ton pads in a 3/4 ton caliper and 8 lug rotor did not fit. wider pads so they wouldnt slip over the 8 lug rotor. can not confirm if that was a manufacturer design difference or what. hearsay i suppose.

[DirtyLarry]

Originally Posted by 84 400

Does anyone know the GM part number?? Apparently you can still buy them new....

I don’t believe the backing plates are available anymore. Heck, I couldn’t even find them on the AC Delco, Napa Prolink or Dorman’s website

Originally Posted by obijuan

supposedly 3/4 ton calipers are different piston something or other this and that. dimensionally identical to each other.

i have seen half ton pads in a 3/4 ton caliper and 8 lug rotor did not fit. wider pads so they wouldnt slip over the 8 lug rotor. can not confirm if that was a manufacturer design difference or what. hearsay i suppose.

Hearsay or something because the calipers and pads are the exact same part number between on the ½ ton and ¾ ton. The backing plate is different because it moves the caliper outwards a tad in order for the pads to line up with the larger diameter ¾ ton rotor.

[eric67m]

Not to sidetrack but...

If both 1/2 T and 3/4T calipers are the same on dana 44's....

When doing a 14 bolt rear disk swap must I use all 3/4T? It sounds like on the rotors I would use 3/4 T to match the front. But the calipers for the rear could be dana 1/2 or 3/4 ton. Could I also use 10 bolt calipers?
Posted via Mobile Device

[84 400]

Originally Posted by eric67m

Not to sidetrack but...

If both 1/2 T and 3/4T calipers are the same on dana 44's....

When doing a 14 bolt rear disk swap must I use all 3/4T? It sounds like on the rotors I would use 3/4 T to match the front. But the calipers for the rear could be dana 1/2 or 3/4 ton. Could I also use 10 bolt calipers?
Posted via Mobile Device

Yes you can use 10 bolt calipers or Dana or 78 cadilac elderado calipers for the ebrake function. Who's brackets are you using? I am using diy4x.

[eric67m]

I have a set of ruff stuff specialties brackets. I have not put them on yet. I held a set of 10 bolt calipers up to them and they seemed to not line up. I will have to take another look. Only looking for dana 44 8 lug calipers limits my junk yard search immensely.

http://www.ruffstuffspecialties.com/...ry_Code=BoltOn
Posted via Mobile Device

[84 400]

Originally Posted by eric67m

I have a set of ruff stuff specialties brackets. I have not put them on yet. I held a set of 10 bolt calipers up to them and they seemed to not line up. I will have to take another look. Only looking for dana 44 8 lug calipers limits my junk yard search immensely.

http://www.ruffstuffspecialties.com/...ry_Code=BoltOn
Posted via Mobile Device

I just get my 10 bolt calipers at Napa. They are less then 20 bucks a piece. As DirtyLarry mentioned the 10 bolt uses the same part number for calipers weather 3/4 or 1/2 ton. On there site it says u can use 73-87 3/4 ton calipers. After 77 gm used the 10 bolt so the calipers should fit. Also a guy in the reviews is using elderado calipers which are the same dimensional as the 10 bolts.

[LONGHAIR]

Yeah, I wouldn't bother with junkyarding for brake calipers either. You still have to deal with things like rusted or plugged bleeders, boot tears, leaks, etc. Buy some from a local parts place.