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kvanoort
05-09-2010, 08:17 AM
I need to rebuild my front diff on my '72 40 and would like to upgrade to disc brakes. Is it possible to take a '77 front diff and simply switch out the drum to disc parts from the knuckles out?

RicardoJM
05-09-2010, 08:26 AM
Yes Kent, just swap everything from the knuckles out. What all do you have from the 77?

If it is the whole axle (and the gearing is appropriate) you might want to consider prepping the 77 axle and then just swapping the axles.

kvanoort
05-09-2010, 09:01 AM
I picked up a complete front axle from a '77 40.

Uncle Ben
05-09-2010, 09:06 AM
Yes Kent, just swap everything from the knuckles out. What all do you have from the 77?

If it is the whole axle (and the gearing is appropriate) you might want to consider prepping the 77 axle and then just swapping the axles.

By knuckles out I assume you mean from the knuckle balls out. The knuckle has the ears for the calipers to bolt to. I agree with Ricardo that it's easier to just swap the whole axle. You will need to change the brake lines as the 77's has two brake lines to the frame while the 72 has the preferred single line near the middle coming up. The drive flanges will probably be different pattern too. Both should be 4.11's if they have the stock gears. Depending on production date the 77 might even have the fine spline pinion in it.

kvanoort
05-09-2010, 09:51 AM
I guess I'll just start digging into the '77 axle and start cleaning things up while evaluating what I have as I go. Thanks for sharing your knowledge...

kvanoort
05-10-2010, 08:09 PM
Found this on SOR's website. Has anyone ever done one of these?

Front Disc Brake Change Over Kit-
USED-Fits 7/70-9/75 FJ40 & FJ55-USED parts have been thoroughly inspected and are in good condition-Comes with from the knuckles out, used hubs, used spindles, used knuckles, used calipers,used disc brake pads, used outer birfield axles, new rotors, & a caliper repair kit-Does NOT come with #080-35B seal (qty 2), #080-59 seal (qty 2), #080-40C shim & gasket set (qty 1), #080-04B lock tabs (qty 2), and #200-12B hub socket, order separately-Specter recommends purchasing #014-01D disc brake master cylinder, & #086-60A proportioning valve-If complete new bearings are desired, see #084-101-For Rear Disc Brake Kit see page 292. recommend new disc brake pads see #084-03.-No return on USED Parts - Club SOR Price is $ 678.30

Air Randy
05-10-2010, 08:40 PM
Found this on SOR's website. Has anyone ever done one of these?

Front Disc Brake Change Over Kit-
USED-Fits 7/70-9/75 FJ40 & FJ55-USED parts have been thoroughly inspected and are in good condition-Comes with from the knuckles out, used hubs, used spindles, used knuckles, used calipers,used disc brake pads, used outer birfield axles, new rotors, & a caliper repair kit-Does NOT come with #080-35B seal (qty 2), #080-59 seal (qty 2), #080-40C shim & gasket set (qty 1), #080-04B lock tabs (qty 2), and #200-12B hub socket, order separately-Specter recommends purchasing #014-01D disc brake master cylinder, & #086-60A proportioning valve-If complete new bearings are desired, see #084-101-For Rear Disc Brake Kit see page 292. recommend new disc brake pads see #084-03.-No return on USED Parts - Club SOR Price is $ 678.30

Thats just all of the used 79 & newer mini truck stuff that you need to convert a cruiser to disc brakes plus new rotors. Personally, I would go down to YodaJim's & buy everything you need there. You can buy a complete disc brake equipped front end for $250 so you end up with an extra diff, housing, axles,etc you can sell and you don't have to pay freight. You can still buy new vented style rotors for $30 each.

kvanoort
08-15-2010, 08:38 PM
Started tearing into the original '72 front axle this weekend and have everything off down to the knuckle. I also began digging into the '77 disc brake axle and ran into a snag. Does anyone know what size the hub nut is on the '77 axle? Is it 54mm? Thanks.

RicardoJM
08-15-2010, 08:46 PM
Started tearing into the original '72 front axle this weekend and have everything off down to the knuckle. I also began digging into the '77 disc brake axle and ran into a snag. Does anyone know what size the hub nut is on the '77 axle? Is it 54mm? Thanks.

Yes, it should be a 54mm. The drum brake axles are 52mm.

kvanoort
08-15-2010, 09:05 PM
Time for a trip to Tool King.

kvanoort
08-16-2010, 09:32 PM
Yes, it should be a 54mm. The drum brake axles are 52mm.

Before going out and purchasing the sockets, Ricardo suggested I try posting up a request to borrow the two hub nut sockets from someone up here on the north side. So, does anyone have hub nut sockets I can borrow? I promise to return the sockets with :beer: in hand. Thanks.

Jacket
08-17-2010, 12:55 PM
I've got a 54mm you can borrow.

corsair23
08-17-2010, 04:35 PM
Sounds like Matt has your back but just FYI that a 2 1/8" socket works well too. Few places stock a 54mm socket but 2 1/8" ones seem to be plentiful. Especially when you're like me and don't plan far enough ahead to just call up Christo and have him bring one to the meeting for you :D