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Old 04-21-2021, 10:28 AM
keyappstate keyappstate is offline
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Join Date: Mar 12, 2021
Location: baton rouge, louisiana
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Help determine rear axle

Hey guys. New to this forum, but I am an active member to several others. short backstory, i recently acquired a family passdown 1971 j4800. single rear wheel, 360 4 speed camper special. brakes were all frozen up when i dragged it out of the barn, decided to swap a disk kit on the back to help move it around during my upcoming restoration. here starts my issue. the rear axle doesnt seem to match what everyone says it should be. it is a full float dana 60 but it has a square 4 stud flange not a 7 stud flange. i cannot find a BOM on the long side tube. it has 30 spline axles, 8 lug hubs and the tag says 4.10 gears. i need to exchange the kit i got from lugnut4x4 but i need to figure out what style axle i have. the axle on the truck is original to the truck, it has not been swapped. i will start a build thread here soon, thank in advance for any and all help. i will be doing a full frame off on this truck..just as soon as i can move it around the yard.






Last edited by keyappstate : 04-21-2021 at 10:46 AM.
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Old 04-21-2021, 02:31 PM
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tgreese tgreese is offline
 
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Location: Medford MA USA
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What's the Jeep PN on the tag?
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Tim Reese
Maine beekeeper's truck: '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS, hubcaps.
Browless and proud: '82 J20 360/T18/NP208/3.73, Destination ATs, 7600 GVWR
Copper Polly: '75 CJ-6, 304/T15, PS, BFG KM2s, soft top
GTI without the badges: '95 VW Golf Sport 2000cc 2D
ECO Green: '15 FCA Jeep Cherokee KL Trailhawk
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Old 04-21-2021, 02:34 PM
keyappstate keyappstate is offline
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Quote:
Originally Posted by tgreese
What's the Jeep PN on the tag?

Just the gear ratio as far as I can tell

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Old 04-21-2021, 03:21 PM
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tgreese tgreese is offline
 
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992240. Typical Jeep PN from this era. Working on it.
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Tim Reese
Maine beekeeper's truck: '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS, hubcaps.
Browless and proud: '82 J20 360/T18/NP208/3.73, Destination ATs, 7600 GVWR
Copper Polly: '75 CJ-6, 304/T15, PS, BFG KM2s, soft top
GTI without the badges: '95 VW Golf Sport 2000cc 2D
ECO Green: '15 FCA Jeep Cherokee KL Trailhawk
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Old 04-21-2021, 03:22 PM
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Heep-J4000 Heep-J4000 is offline
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Have a look for dodge Dana 60 70 and 80 rear axles brake parts ,or maybe you could drill a couple more holes into the flange to match the jeep disk brake conversion parts!
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http://www.ifsja.org/forums/vb/showthread.php?t=180974

99' Dodge ram 2500 4x4 crew cab 5.9 Cummins ,backup work truck for now
73' Jeep J4000 (named Heep or Desert Dragon) amc 360 V8 converted to LPG with T15/D20 (was my daily work truck for thirteen years and is going to have major overhaul
80' Jeep cj5 350 V8 Chevy/ms420/D300 (a slow ongoing never finished project)

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Old 04-21-2021, 03:28 PM
keyappstate keyappstate is offline
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Location: baton rouge, louisiana
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Quote:
Originally Posted by Heep-J4000
Have a look for dodge Dana 60 70 and 80 rear axles brake parts ,or maybe you could drill a couple more holes into the flange to match the jeep disk brake conversion parts!


not really an issue of having enough bolts, i guess i didnt exactly say why the parts dont fit. with the caliper bracket installed, the disk runs into the bracket before the hub is even seated all the way. so its a different hub setup than whatever the 7 stud jeep design is.
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Old 04-21-2021, 03:30 PM
keyappstate keyappstate is offline
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Join Date: Mar 12, 2021
Location: baton rouge, louisiana
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Quote:
Originally Posted by tgreese
992240. Typical Jeep PN from this era. Working on it.

i had someone reach out to me today that said he ran into a dana60 on a 1 ton truck years ago that was similar, he found out it was a 2 year production axle. couldnt remember anything more than that. what resource are you using to cross that PN ?
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Old 04-21-2021, 03:31 PM
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tgreese tgreese is offline
 
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Location: Medford MA USA
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As expected -




Correct open Dana 60 for a '71 J4800. I'm not crossing anything - that's from the Jeep Corp '62-73 J-series parts catalog.

That and the 4.88 version for sixes are the only open 60-3s in that book. I read that as covering ca 1969 through 1973.

Apparently they only had the 53 before that, and the DRW 70. The 60-3 is a different number in the '74 book, but they don't describe
any changes.
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Tim Reese
Maine beekeeper's truck: '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS, hubcaps.
Browless and proud: '82 J20 360/T18/NP208/3.73, Destination ATs, 7600 GVWR
Copper Polly: '75 CJ-6, 304/T15, PS, BFG KM2s, soft top
GTI without the badges: '95 VW Golf Sport 2000cc 2D
ECO Green: '15 FCA Jeep Cherokee KL Trailhawk

Last edited by tgreese : 04-21-2021 at 03:57 PM.
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Old 04-21-2021, 03:55 PM
keyappstate keyappstate is offline
230 Tornado
 
Join Date: Mar 12, 2021
Location: baton rouge, louisiana
Posts: 7
Quote:
Originally Posted by tgreese
As expected -






Correct open Dana 60 for a '71 J4800. I'm not crossing anything - that's from the Jeep Corp '62-73 J-series parts catalog.



That and the 4.88 version for sixes are the only open 60-3s in that book. I read that as covering ca 1969 through 1973.

Apparently they only had the 53 before that, and the DRW 70. it's a different number in the '74 book, but they don't describe
any changes.

thank you. i guess it seems that the 60-3 changed up the flange designs from the 60 and 60-2. ill dig into the interwebs and see if i can come up with info on the 60-3. a BOM would be great.
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Old 04-21-2021, 04:05 PM
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tgreese tgreese is offline
 
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Location: Medford MA USA
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60-3 just means it's a full-floater.

Not to discourage you, but there's no reason to believe that the Jeep 60 conforms to other manufacturers designs in this area.
Jeeps had comparatively low production numbers for trucks and are oddballs in many respects.

That J-series parts book is free to read and download at the Tom Collins site: https://oljeep.com/edge_parts_man.html
In most cases, if you can't find what you need by the Jeep PN, it's likely a Jeep-specific part.

Considering how little the rear axle contributes to braking, you best option might be to abandon the disks idea and refurb the drum brakes.
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Tim Reese
Maine beekeeper's truck: '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS, hubcaps.
Browless and proud: '82 J20 360/T18/NP208/3.73, Destination ATs, 7600 GVWR
Copper Polly: '75 CJ-6, 304/T15, PS, BFG KM2s, soft top
GTI without the badges: '95 VW Golf Sport 2000cc 2D
ECO Green: '15 FCA Jeep Cherokee KL Trailhawk

Last edited by tgreese : 04-21-2021 at 04:10 PM.
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  #11  
Old 04-21-2021, 04:30 PM
keyappstate keyappstate is offline
230 Tornado
 
Join Date: Mar 12, 2021
Location: baton rouge, louisiana
Posts: 7
Quote:
Originally Posted by tgreese
60-3 just means it's a full-floater.

Not to discourage you, but there's no reason to believe that the Jeep 60 conforms to other manufacturers designs in this area.
Jeeps had comparatively low production numbers for trucks and are oddballs in many respects.

That J-series parts book is free to read and download at the Tom Collins site: https://oljeep.com/edge_parts_man.html
In most cases, if you can't find what you need by the Jeep PN, it's likely a Jeep-specific part.

Considering how little the rear axle contributes to braking, you best option might be to abandon the disks idea and refurb the drum brakes.

If I can find the drums, shoes, slave, and parts kit I will. Appreciate the feedback. All of the Jeep Dana 60s that have been shared with me, and info I can find online, have the 7 stud flange. Which is specific to keep to my understanding. I only inquire about other manufacturers because I know Jeep is famous for using other peoples parts.
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Old 04-21-2021, 04:51 PM
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tgreese tgreese is offline
 
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Location: Medford MA USA
Posts: 11,425
The drums should be the only difficult part to source. As I recall, they are a Raybestos 2934R and are available on RockAuto.
They list them for the '72 J4800 but not the '71, and I think that's just a mistake.
I don't see any difference according to the J-series parts book.
The aftermarket listings for Jeeps, especially the less common models, are rife with errors.

If you have a friendly indie parts store near by, they could order one in and you could compare with what you have.
Pretty sure they're right.
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Tim Reese
Maine beekeeper's truck: '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS, hubcaps.
Browless and proud: '82 J20 360/T18/NP208/3.73, Destination ATs, 7600 GVWR
Copper Polly: '75 CJ-6, 304/T15, PS, BFG KM2s, soft top
GTI without the badges: '95 VW Golf Sport 2000cc 2D
ECO Green: '15 FCA Jeep Cherokee KL Trailhawk
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