differential rebuild help? - JeepForum.com

 
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post #1 of 12 Old 02-13-2012, 06:58 PM Thread Starter
yoyoyo109
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differential rebuild help?

Hi everyone. so the other week the bolts on my ring gear sheared off and being in school at the moment, i went ahead and put it in the shop to have the gears replaced. well now, the place I'm using(never been there, only read reviews online) is giving me a suspicious feel so i wanted to know just how hard it was to disassemble a rear differential. any links to writeups would help, i didn't find any on my first search. how hard is it to rebuild these yourself?

i have arb air lockers with dana 35 4.11 gears

should i leave it in the shop and have them replace everything or should i take it out, park it in my driveway and fix everything myself

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post #2 of 12 Old 02-13-2012, 07:15 PM
dilligaf69
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get manuals and read, read, read, and read some more. It's not technically difficult as far as replacing the parts go. the pain of it is getting the back lash of the gears set right. If it's not right.... you run the risk of premature wear of the gears, damage to your lockers or even exploding the gears if put under enough load. No Joke! As an ex-mechanic, I never felt comfortable rebuilding differentials myself. I didn't like the idea of potentially destroying so much $$$$$ so easily. Don't get me wrong, if you study up enough on how to do it and feel comfortable... go for it!!! The more knowledge you have the better off you are.

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post #3 of 12 Old 02-13-2012, 07:17 PM
dillonjm
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Its not overly hard, but it does require some knowledge and special tools that I'm sure you probably don't have if you're asking this question (no offense intended).

I did my first differential re-gear on my current Jeep and did a lot of research first. A week or two, in fact, but I'm not the smartest egg.

Google up differential setup/regear. There is a lot of writeups with pictures out there.

IMHO, and I mean this with the nicest intent, that if you're asking these questions you're probably not ready to tackle this without some help. I'd either leave it with the shop you have it at and have it rebuilt or take it somewhere else.

Plan on labor running anywhere from 300-800 plus parts (2-500) depending on the shop and their markup.

13 GC Overland - (Wife's DD) 5.7, stock
Past Jeeps: 99TJ, 78CJ7, 91YJ, 01WJ, 03TJ, 05KJ
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post #4 of 12 Old 02-13-2012, 07:17 PM
Louie4
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Setting up gears require a lot of research and the proper tools. I researched online, used threads on JF and instruction manuals from Yukon and watched youtube videos. I still didn't get the hang of it until I started getting my hands dirty but at least I knew what had to be done.

I'd say let a professional do it. Preferably one with 4x4 experience and setting up gears and lockers.

Edit: Those guys beat me to it ^

Lou

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post #5 of 12 Old 02-13-2012, 07:23 PM Thread Starter
yoyoyo109
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Quote:
Originally Posted by dillonjm View Post
Its not overly hard, but it does require some knowledge and special tools that I'm sure you probably don't have if you're asking this question (no offense intended).

I did my first differential re-gear on my current Jeep and did a lot of research first.

Google up differential setup/regear. There is a lot of writeups with pictures out there.

IMHO, and I mean this with the nicest intent, that if you're asking these questions you're probably not ready to tackle this without some help. I'd either leave it with the shop you have it at and have it rebuilt or take it somewhere else.

Plan on labor running anywhere from 300-800 plus parts (2-500) depending on the shop and their markup.
no offense at all, that's the reason it was in the shop to begin with and why I asked
I'll just leave it there though and let them fix it. Someday I'm sure I'd be able to learn to rebuild them but being that this is my daily driver, I don't have the time to read up and then fix it
Thanks for the input everyone
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post #6 of 12 Old 02-13-2012, 07:26 PM
lar308
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What are they telling you? I have alot of experience in the area. Can you do it, yes, but. It does take tools and time. How did you shear the ring gear bolts? I'm planning on helping another member setting up his axles. What time frame are you looking at? You may want to consider a used axle as a interm fix. Let me know if I can help. Ron
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post #7 of 12 Old 02-17-2012, 07:16 PM
popatop541
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To do it right you need a case spreader so you can get your preload pressures on the bearings right! Also an inch pound torkwrench. getting the Bearing pressure and the spacing between the pinion and the ring gear is critical if you want it to hold up! A stock axle is not worth fixing there to light unless you are running a 4 cylinder! I strongly suggest you have someone experienced help who has done it and run it!
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post #8 of 12 Old 02-17-2012, 08:45 PM
Louie4
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Quote:
Originally Posted by popatop541
To do it right you need a case spreader so you can get your preload pressures on the bearings right! Also an inch pound torkwrench. getting the Bearing pressure and the spacing between the pinion and the ring gear is critical if you want it to hold up! A stock axle is not worth fixing there to light unless you are running a 4 cylinder! I strongly suggest you have someone experienced help who has done it and run it!
I'm not saying this is the right way but after I got my backlash and pattern set I added .002" to each side of the carrier bearing shims and double checked my measurements. I used a rubber mallet to tap the carrier in. This allowed for preload on the carrier bearings. Just my own experience though.

Lou

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post #9 of 12 Old 02-22-2012, 02:53 PM
ldso
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Also I believe you need a press to get the pinion bearings on. I counted up about $200 in tools I would need, if I bought the cheapest Harbor Freight and eBay stuff. I am still planning on paying to have mine done.

It sounds like you have your hands full with school so I would let them do it. If they screw it up you can make them make it right.

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post #10 of 12 Old 02-24-2012, 10:33 AM
Flajeeper1
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dillonjm's cost figures should be about right.

"Plan on labor running anywhere from 300-800 plus parts (2-500) depending on the shop and their markup."

I would definitely use an axle shop to do the work. They do this all the time and you'd have the best chances of getting quality work.
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post #11 of 12 Old 02-24-2012, 10:50 AM
lar308
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The case spreader is optional. The side bearing preload can be measured with an inch pound torque wrench. A hydraulic press is needed change the inner pinion bearing, carrier side bearings can be installed without a press. The following sheets will give you the numbers and order. These are from GM school. Ron

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post #12 of 12 Old 02-24-2012, 02:51 PM
remmons
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My first gear install was on a '77 El Camino. It went o.k. but I did not have the right gear mesh pattern, but Iran with it anyway thinking that it won't hurt anything. Wrong. Within a week the diff carrier was all ate up from debris.

My second (and since then) install have all went well. I still won't take on a gear install lightly, it is one of the trickiest jobs on any rig. I had found that by using a spare set of carrier bearings of the same make that have been slightly reamed out so that they can slide on and off the carrier easier made the task go much smoother. I did not have a case spreader, but I did have a dead-blow hammer handy (and a ball peen hammer and a block of wood on stand-by) when I reinstalled the carrier, just be sure that you tap evenly on both sides, you don't want it to get cocked sideways or you run the chance of ruining a set of bearings. Patience is your best friend on a gear install.

Robert.

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