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Old 09-23-2012, 11:09 AM   #1
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Stupid Rear diff question

My wife destroyed my rear diff in my '99 Wrangler. I have read enough on the subject that I have decided NOT to replace on my own, but the shops in the area want a LOT of money for parts, not to mention labor. Here is my question.. I have a Dana 35 with 3.73 gears and I'm wanting to switch over to 4.10 gears. I have seen Dana 35 gears that are labeled a vehicle specific. Isn't a 35 a 35? I'm not replacing the whole axle assy, just the internals. And before it comes up, I KNOW a lot of people are not fans of the Dana35, swapping the whole axel is not an option at this time, I have to work with what I have. I am running 33's, but at this time very little "Severe Duty" with it. Thank you.

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Old 09-23-2012, 12:38 PM   #2
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Here's an option: A quick and cheap junkyard swap or look for someone around the forums in your area for spare axles and/or parts. Like me...I've got a D44 3.73 sitting around my place. I'm sure you'll be able to find something. Best of luck to you bro!

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Old 09-23-2012, 01:03 PM   #3
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SURE BLAME THE WIFE..what model, engine, and trans type do you have?
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Old 09-23-2012, 01:09 PM   #4
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For the cost of the gears swap I would move upto at least 4.56 gears as going from 3,73's to 4.10's is just not worth the money. again need to know your tire size and a few other tings, but in general terms 4.56 would be a good jump. Gears should run about 250 a set with install kits. so $500 for parts for front and rear to match and figure another 250-350 per axle for the install. Tj dana 35 are the same as far as I know...
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Old 09-23-2012, 01:24 PM   #5
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Quote:
Originally Posted by ronin1604 View Post
I have a Dana 35 with 3.73 gears and I'm wanting to switch over to 4.10 gears. I have seen Dana 35 gears that are labeled a vehicle specific. Isn't a 35 a 35? I'm not replacing the whole axle assy, just the internals.
I won't bother you about the "not a fan of D35" thing, but i WILL recommend that you reconsider replacing the whole axle; especially considering that you are considering moving to 4.10 gears. Every 4cyl TJ to roll off the assembly line had a D35 rear end with 4.10 gears in it. You can pull the rear assembly out of a junked 4cyl TJ (plenty with front end damage out there) and have a complete "bolt in" assembly that you can change for a couple hundred dollars, basic hand tools, and 2-4 hours of your time. Replacing the ring/pinion/carrier inside the differential, AND SHIMMING IT PROPERLY is an extremely labor intensive process. It requires several hours to do correctly, and tools that most people don't have laying around the house. The rebuilt kit alone is probably ~$200, and then you're looking at ~$500 per axle in labor for a shop to do it.

To answer your other question, a D35 is not a D35 for all vehicles/options. Some manufacturers use reverse cut gears and a top-loaded pinion for extra ground clearance. Even in the TJ years, you will have a different carrier depending on what gears it came from the factory with. The carrier that came with 3.73 gears can hold 3.73 AND LOWER. The carrier that came with 4.10 gears can hold 4.10 AND HIGHER. The ring gear is a different thickness starting at the 3.73/4.10 break.
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Old 09-23-2012, 01:25 PM   #6
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Originally Posted by 4Jeepn View Post
For the cost of the gears swap I would move upto at least 4.56 gears as going from 3,73's to 4.10's is just not worth the money. again need to know your tire size and a few other tings, but in general terms 4.56 would be a good jump. Gears should run about 250 a set with install kits. so $500 for parts for front and rear to match and figure another 250-350 per axle for the install. Tj dana 35 are the same as far as I know...
I agree you would be happy with 4.56 or 4.88 depending on your specs probably 4.56 .you wouldnt hardly even notice a 4.10 upgrade.
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Old 09-23-2012, 01:38 PM   #7
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Lol!

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Originally Posted by kheiland View Post
SURE BLAME THE WIFE..what model, engine, and trans type do you have?
Don't think she did anything wrong, but she doesn't know that... Getting some forgiveness on credit.

My jeep has the 4l engine, and not 100% sure about trans off the top of my head. I was looking at the 4.10 because I'm running the 33's. Figured this would help my MPG's slightly due to it being mainly a improved road vehicle. I realize the difference in the Carriers, but I have to replace it also... The pinion gear shattered, 1 of the planetary gears lost 3 teeth, and it ground about a 2in ring in the carrier all around it, right through the locking bar. So, ALL interior parts are getting replaced.
I bought this jeep used, and not sure of the lift kit on it, but appears to have tabs welded on. That is my biggest issue with a swap.... no way to replace them.

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