All right, I need some help, I have a 79 Ford f150 4x4, I have a chance to buy a rear disc 9" rear end. Now the questions,
1. Anyone here ever do this conversion?
2. I have not closely inspected the rear 2.75 gear out of Lincoln. Do the rear rotors just slip over the axle lugs like the drums?
3. Is it possible to mount the calipers onto my existing 9" rear? Does the caliper mounts attach in place of the dust plate of the drum brakes?
4. Is this fairly easy change?


Ohio Bob
First a servant of Christ
Second A Husband/Father
Third A FORD fanatic
===========================
Hey third ain't bad!

 

 

Bob, I have converted two 9" Rears to disk brake. We did not use lincoln parts though. If i remember correctly the bolt pattern is different or somthing. Measure them to be certain, i did these 5 and 10 years ago. i used front rotors and turned them flat and slightly larger on the back sides so they would slip over the rear axles. I also used longer wheel studs from the local autoparts store to hold them together.

The hardest part is the disk mounts. I ordered a pair of weld ons from a race shop $25 and used GM calipers. (Much easier to obtain and mount). By putting the calipers on the rotors and mounting the bracket to the caliper, you only have to have someone hold the brake to alighn the bracket to the axle tube then weld it.

Cheap fix for extra braking, lots of stopping power. You need to add an adjustable propertioning valve to the rear system and the only downside is you dont get a parking brake unless you rob calipers of an old T/A or GM that had manual overrides.

Good luck
Sean

 

>1. Anyone here ever do this conversion?
I tried this conversion with lincoln parts, and still have some of the parts lurking in my garage. I lost interest when it got to the welding part
>2. I have not closely inspected the rear 2.75 gear out of Lincoln. Do the rear rotors just slip over the axle lugs like the drums?
Yes
3. Is it possible to mount the calipers onto my existing 9" rear? Does the caliper mounts attach in place of the dust plate of the drum brakes?
Yes and yes with lots of labor. The bracket that the caliper mounts to is on the axle itself. It is between the wheel bearing and the axle flange(where the lugs are) You would need to press off the bearings off of both axles (the lincolns were 28 spline) and swap out the parts
>4. Is this fairly easy change?
Maybe, if you have all the parts and nesceseary(sp) skill

here is my guestimated parts list from a donor 9"
1. Calipers
2. Rotors (they have no hubs)(the lincoln ones will require re-drilling to 5 on 5 1/4, vs 5 on 4 7/8)
3. Caliper mounting braket-bolts onto end of axle tube (requires bearing removal and installation on shaft)
4. Possibly the axle flange at the end of the lincoln axle, to cut off and weld onto the housing you want. (the bolt pattern might be different, not sure. Its Ford's evil way of preventing people from easy swaps!
5. E-Brake cables
6. Correct brake lines
7. Proportioning valve
OR, the whole axle (if the widths are close enough) the only thing you would have to do add the spring perch and maybe upgrade the axles to the beefier 31, or 35 spline momas. Once that was out of the way, just add the brake lines and ebrake cable. (and proportioning valve)

Of course this is all in theory, I have never finished my swap, so I might be missing something.. anyhoo good luck.

Tony

'74 F250, 460, C6 "beater"-soon to be organ donor
'73 F250. 360, C6 "midnight auto"
'77 F250. 4X4, 351M, Soon to be organ donated
'74 F350, SCS, 390 (not yet, but I like typing it!!!)