Rear axle shot

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October 25th, 2010, 10:58 PM
Jester

Rear axle shot

When I pulled the drain plug on the rear axle to start the process of replacing the leaking cover gasket, I noticed that there was A LOT of metallic goo on the magnet and a couple of chunks. No immediate signs of where it came from.

Tonight I had a chance to look at it more and I found that the pinion gear is totally shot. It has big chunks out of it. Strange cause the ring gear is fine. What could cause this?:confused: Will try to get some pics when I can get back out there and its not dark.

Now I am trying to decide what to do from here. Rebuild the stock axle? Get a spare someone has pulled, run it as is and then rebuild the current when I have time & funds? Do a swap to a modern D70? If I rebuild, should I do a gear ratio change?

Such a bummer.:(
October 26th, 2010, 01:05 AM
saxon

Trenton, My gear guy is pretty reasonable and he has my stock gears on his shelf. Bet you can get the whole job done for cheap. Just a thought.
October 26th, 2010, 11:32 AM
wrecker

Least expensive option would be to pick up someone's takeout. D70 would be my choice. Or since you'll have to change both axles if you do that maybe buy a set from Gubni(?) on the for sale board. Allready have a rear locker and 4.56 gears. Those won't be just a weekend project though.
October 26th, 2010, 11:35 AM
Jester

Quote:

Originally Posted by saxon

Trenton, My gear guy is pretty reasonable and he has my stock gears on his shelf. Bet you can get the whole job done for cheap. Just a thought.

That is a good alternative. I will give you a call to discuss.
October 26th, 2010, 01:23 PM
Duane

if you dont rebuild yours, I would get a pullout, they cant be worth much since everyone complains about them, and ends up swapping them out. LOL

Duane
October 26th, 2010, 02:37 PM
Jester

Quote:

Originally Posted by Duane

if you dont rebuild yours, I would get a pullout, they cant be worth much since everyone complains about them, and ends up swapping them out. LOL

Duane

That was one of the options I am throwing around.

http://www.m715zone.com/vb/showthread.php?t=19782
October 26th, 2010, 02:38 PM
brute4c

What is your Vin...basically, is yours an earlier truck?

The reason I ask is that...weird as it seems...early trucks (unknown how many like so many other things about these trucks) had a coil spring type thing on the pinion instad of the usual shim setup. This has come up due to a few members in the past tearing into the rear axle and changing gears or investigating howling noises or other problems. I know a guy who found at least 2 different ones this way. He talked to a motor pool veteran in the early 90's and was told that there were these strange setups, they caused problems in service, the militarys equivalent of a recall was done and all of the so equipped trucks were supposed to be refitted with the normal shim type setup.

Obviously some were missed...about a half dozen I know for sure...maybe one more now?
October 26th, 2010, 04:05 PM
Jester

Quote:

Originally Posted by brute4c

What is your Vin...basically, is yours an earlier truck?

The reason I ask is that...weird as it seems...early trucks (unknown how many like so many other things about these trucks) had a coil spring type thing on the pinion instad of the usual shim setup. This has come up due to a few members in the past tearing into the rear axle and changing gears or investigating howling noises or other problems. I know a guy who found at least 2 different ones this way. He talked to a motor pool veteran in the early 90's and was told that there were these strange setups, they caused problems in service, the militarys equivalent of a recall was done and all of the so equipped trucks were supposed to be refitted with the normal shim type setup.

Obviously some were missed...about a half dozen I know for sure...maybe one more now?

Interesting. Don't know if it qualifies as early or not but VIN 12523. delivery date 6/67
October 27th, 2010, 12:16 PM
brute4c

Farly early...not sure if it is early enough or not...if you can tear it down and find out, it would be interesting...

#2523 of around 30,000...seems early to me...
October 27th, 2010, 01:31 PM
Jester

Quote for re-gear from Randy's is about $1300 on the cheap side. Not really an option. For that much would rather find a set of modern D60/D70 to swap in.

Still waiting to see if Saxon's gear guy still has the old gears. He is looking but is not sure.
October 27th, 2010, 03:47 PM
Jester

New option: Boyce has a NOS gearset for $285.00.
October 27th, 2010, 07:03 PM
503m715

Dont forget to try A B Linn. He can usually beat everyone else on price.
October 28th, 2010, 12:42 PM
Jester

Quote:

Originally Posted by 503m715

Dont forget to try A B Linn. He can usually beat everyone else on price.

Isnt he just about down to the chair by now? :D

I did ask him and he does not have any. So far Boyce is the cheapest option for new. Have not followed up with Saxon's gear guy yet. Fingers crossed.
October 28th, 2010, 07:21 PM
Dan Mac

Rearend

I do have a complete set of extra axles. I wasn't really wanting to part with either of them since I have two trucks and having spare parts around is always good, but for a fellow zoner in the NW I might cave in. Maybe we can work something out. PM me if interested.
October 29th, 2010, 06:22 PM
Jester

wheww. Good news. Saxon's gear guy does have his old gears and will set up the axle for me with gears and new bearings for a reasonable amount.

It's a bit of a trek to get it out and hauled down to him but the price is right.

Gonna try to get the axle pulled this weekend so I can get it down to him next weekend.

Thanks to everyone that offered up their parts/assistance. Love this place.:D
October 29th, 2010, 10:57 PM
Duane

glad its working out, keep us posted!

Duane
October 31st, 2010, 09:49 PM
Jester

After about 3 hours, the rear axle is out and on the ground. Now to get it to the gear guy.

I might try to do the 14 bolt backing plate conversion while it's out - if I can find all the parts in a reasonable amount of time.
November 1st, 2010, 03:06 PM
Binford

Hey, if you find a whole axle between here and Salt Lake City, Utah, or Turlock, Kalifornia, I'm not necessarily against leaving the Grand Cherokee at home and taking the truck to drag the thing home on the Binford Express....

Sounds like you've got a better solution at hand though....
November 1st, 2010, 08:48 PM
wrecker

While the axle is out, do a quick service on the spring mounting pins. Pull the springs and check the brass bushings, etc. The crud that was packed in mine was kinda unbelievable. No new grease was ever gonna get through that stuff.
November 11th, 2010, 10:51 PM
threedoor

I've got a small diameter 14 bolt brake set up, backing plates and drums.
November 12th, 2010, 12:26 PM
Jester

Quote:

Originally Posted by threedoor

I've got a small diameter 14 bolt brake set up, backing plates and drums.

A 13" brake set up? I would only need the backing plates, shoes, hardware and e brake cable if you had it. Let me know.
December 12th, 2010, 01:11 PM
Jester

I finally got the housing w/ gears down to the gear guy so he can install Saxon's old gears with new bearings. It was a 5 hour ordeal cause traffic was horrible :mad:

When I was there, what was sitting in the corner? A 14 Bolt with the backing plates, shoes and brake cables. He said he was not going to use the drum brakes so I will get those from him when I go to pick up the axle. :)

Got new seals off fleabay for cheap.

Also found that Summit Racing has all the bearings/races way cheaper than anywhere else. Plan on replacing them all for good measure.

Need to get the truck back together so when the La Nina blizzard hits I am ready.
January 10th, 2011, 12:53 PM
Jester

Got the axle home. Managed to screw up my back in the process :mad:

Will post some pics of the torn up pinion later on.

Also, the backing plates I got off the 14Bolt down there are not the right ones. A little bit too small. :confused: Guess that hunt is on again.
January 10th, 2011, 02:19 PM
brute4c

By too small do you mean the mounting holes or what? I know the bolt holes are close but not exactly perfect...the center hole needs to be enlarged.
January 10th, 2011, 07:02 PM
Jester

Quote:

Originally Posted by brute4c

By too small do you mean the mounting holes or what? I know the bolt holes are close but not exactly perfect...the center hole needs to be enlarged.

Nope, diameter of the plate itself. Thinking the ones I got are the smaller drum 14 bolt. I measured but in the rush I did not double check before I left. Oh well.
January 10th, 2011, 07:04 PM
Jester

Here is what the pinion gear looked like. Very strange.

http://www.m715zone.com/vb/picture.p...&pictureid=235

Btw - it was shimmed the normal way. No funky spring set up.
January 11th, 2011, 07:02 AM
cleefurd

Ring and pinion

In case anyone following this link was hunting on these items;
http://cgi.ebay.com/ebaymotors/DANA-...item43a45d9d93
January 11th, 2011, 09:55 AM
TheDude

Just to add, I believe Eastern surplus has a factory r/p set to sell. They are also trying to bring themselves into M715's along with the deuces and 5 tons. Figured I would mention it as it was somewhat on par.

RM
January 11th, 2011, 09:36 PM
jeeper

Quote:

Originally Posted by cleefurd

In case anyone following this link was hunting on these items;
http://cgi.ebay.com/ebaymotors/DANA-...item43a45d9d93

Would that small chip be a problem?
February 4th, 2011, 12:31 PM
Jester

Finally tracked down the right backing plates (fingers crossed). I plan on doing a write up on the conversion with pics. Will post it once I am done.

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