Need Help IDing whether I have a sm, med, or large bearing 9"

[broncnaz]

Just look at the brake drum itself if it looks fat and small it has the 10" brakes which could be the medium duty or the small bearing axle. The small brakes will also have a noticeable gap between it s diameter and the rim diameter the brake drum its self will be about 2.5in wide
If the drum diameter comes to about within 1 1/2" of the rim it has 11in brakes its a large bearing axle. the drum will only be about 2in wide.

 

[StnePny]

If it is a '74 (& '75), the explorer rear disc is a pretty straight bolt on, with minor modifacations, loke re-drilling for 5 x 5 1/2 wheel studs and opening the ID of the center of the disc opening.

Even tho they call it a Med-Duty, but, it still uses same Large Axle Bearing on the axle.

 

[mofoco1]

After all that is said and done I think it's a BB according to the measurement chart a few posts up, my measurements are on the bigger rather than smaller side between the mounting bolts. The data plates says HD since its a U152 right?

 

[mofoco1]

I am doing the Lincoln Mark V or something I know they are not Versailles as I would have the whole axle. I did a thread asking for those who had done the m and not 1 person replied. This is going to be a DD so the Lincolns Ebarkes will be just fine. I hate the idea of having to deal with drums when I have discs. I had hoped that this axle was a BB or BB/MDuty cause the caliper brakes would just mount up instead of having to whack the ends off and installing the Big ends. I like the beefiness of the cast brackets, these are just like the Versailles, the are not the welded Mark brackets that you see on some FS axles...Mo

 

[broncnaz]

Few people bother with the lincoln disc brake swaps anymore mostly becasue they are harder to find and usually costly as well as everyone used to grab them to convert. Might just do a google search i know there used to be info on the swap.

 

[mofoco1]

This is for sure a BB the spacing is as the chart says. Went to Napa today to check on the difference between the Versailles -Lincoln and -79 F150 rotors. The Versailles is out of the question, it is 1" smaller in dia. than the Lincoln, they are almost the same thickness but the hat on the Versailles will not support a 5x5.5" redrill. They are too small. I laid the f150 rotor and the hat is obviously bigger and the holes overlap the edges of the Versailles, no one in town has them they are all special order. So unless the Mark V has a real big hat that is as big as the F150 rotor I am at a stalemate. The f150 rotor are almost exactly the same as the Mark V in diameter so they would fit plus they have the 5x5.5" pattern already they are thicker by almost .50" . The hat will not center the flange but neither did the drums. Would longer studs work with knurling to take some of the slop off. I gotta figure this out soon...Mo

 

[mofoco1]

In my area they are very common in the yards. Plus I would not contemplate doing it if it weren't for the fact that I already have them, they are beadblasted and painted 15 years back just waiting on the shelf to be installed. I am going to take off Friday and hit the yard and see if I can get a used rotor for comparisons.?:?

 

[broncnaz]

I've seen a lot of them in yards to but they usually want more for them because people do want them. Not saying dont use them Just pointing out that the lack of responses is because few people have gone that route due to cost and the availibility of other kits.

I want to say that people have recommended using jeep front rotors both because of cost and I believe bolt pattern. If I remember correctly the lincoln rotors are usually side specific and cost more plus the both pattern is wrong anyways. but if you have good lincoln rotors then you may only need to redrill the bolt pattern. Also I've heard that lincoln calipers are very costly maybe another reason people have gone other routes. Your drums should have centered on the axle flange if they didnt then someone modified the drums or you have aftermarket axles that were made for a disc brake conversion such as the explorer type brakes. In either case the rotors really need to fit the flange. the studs are not the best area to be trying to center the rotor. I also believe that in most cases you need to have the outer edge of the axle flange turned down so the axle shaft will fit inside the rotor.
I'm just pulling this stuff out of memory since your not getting much help you may just want to google it to get some better info.

 

[mofoco1]

The stock drum has a very small centering hole like 2" an that is the snub of the axle poking thru, right? The slots have the big opening so they can be used front or rear, so they don't center on the little eccentric provided by the axle thru the drum, this make sense? The big problem is since I don't have a Lincoln rotor I cant say whether the hat itself is bigger around to allow the large pattern, you can not do the redrill on the Versailles for sure. Wish me luck at the yard. By the way the prices on the rotors and calipers have gone down, rebuilt calipers $55 w/ core or add $56 per side, the rotors are $43 at Napa. The bad, I can't get drilled and slotted Mark V rotors to match the fronts. Which Jeep rotors are you referring I need to source out some specs to check against the Mark V's. Rotors need to be almost 11" in dia. 1" thick is ideal could care less if they are directional or not as long as they are vented.....Mo
PS: Can a centering slug be milled and screwed(drill and tapped) to the axle flanges to offer some centering for the rotors? I had already worked in turning down the axle flanges by .25"