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Old 08-09-2018, 09:52 AM
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Re gearing; Choosing a Shop Question

Recently went to 35 in tires. I am strongly considering re gearing. My JKUR came with the 3.73 instead of 4.10. I will likely go to 4.56 or possibly 4.88 not decided.

I do not know much about gearing aside from what i am learning on the internet and esp. this forum.

How does one decide who to let do the work.

I see many posts where people seem to use the least expensive shop. Is this wise as there is certainly a chance of major issues if they mess things up.

Thoughts on local mechanic as opposed to a chain such as 4 Wheel parts?

I will ask around but curious if i am "safer" using a national chain such as 4 Wheel Parts

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Old 08-09-2018, 10:47 AM   #2
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Originally Posted by pulpfiction44 View Post
Recently went to 35 in tires. I am strongly considering re gearing. My JKUR came with the 3.73 instead of 4.10. I will likely go to 4.56 or possibly 4.88 not decided.

I do not know much about gearing aside from what i am learning on the internet and esp. this forum.

How does one decide who to let do the work.

I see many posts where people seem to use the least expensive shop. Is this wise as there is certainly a chance of major issues if they mess things up.

Thoughts on local mechanic as opposed to a chain such as 4 Wheel parts?

I will ask around but curious if i am "safer" using a national chain such as 4 Wheel Parts
It's probably going to come down to where you live and what's available? When I went to 35s, I was able to find a local specialty shop that does gears and all things differential. They have been around for 30 years and plenty of Jeep people use them.

Some national chains will be good, or not, buts it's going to be about the individual local store for that chain. Check around here and ask in the local forum for your area.

Good luck. You'll love the 35s. I went with 4.88s and love them!

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Old 08-09-2018, 12:26 PM   #3
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I used a local shop that I trust. $1400 which is about right since I had 3.21 gears and needed a new carrier (~120) and diff cover(~100) for my D30 front. I went 4.56 for 35's. They feel about the same as stock from the dealer (31's). If you are between 4.56 and 4.88 I would say 4.56 if you are on the highway a bunch, 4.88 if its mostly an around town jeep.

Good luck!
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Old 08-09-2018, 12:37 PM   #4
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Chain stores are hit and miss. They can have some of the best techs or they can end up filling their jobs with whatever they can scrape off the bottom of the barrel. Even one store can vary from year to year. It all depends on who they can hire.

But that's the same with any other shop.

Best bet is to talk with Jeepers in your area. Talk to the people in the local clubs. Find out where they take their Jeeps.
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Old 08-09-2018, 12:47 PM   #5
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Well, get someone you trust to do a good job and not just get-er-done. If you kind of know how the rear diff is put together it will help. Rear wheel bearing seals can't be changed without removing the rear wheel bearing and that is pressed on. So many don't change them unless they show signs of a leak. If you have low miles then you might not need carrier bearings. I would do front seals cuz to do them later you have to pull the front diff gears out. Then there is pinion bearings and seals. A good mechanic will know if and what needs to be changed. The more you change the more it costs but you don't want to do it again to fix a leak. Use the gears that the shop supplies. Follow the gear break in instructions. If you are going to get new shafts that is a good time to do it. Also a good time to do diff covers. i would go to a shop that does a lot of gears, not just "can" do them. I would visit the shop, a scrap yard is not a shop. You must have a AEV Pro-cal or something to reset the gear setting in the computer. Good luck. I need to do 4.56's someday.
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Old 08-09-2018, 01:45 PM   #6
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Well, get someone you trust to do a good job and not just get-er-done. If you kind of know how the rear diff is put together it will help. Rear wheel bearing seals can't be changed without removing the rear wheel bearing and that is pressed on. So many don't change them unless they show signs of a leak. If you have low miles then you might not need carrier bearings. I would do front seals cuz to do them later you have to pull the front diff gears out. Then there is pinion bearings and seals. A good mechanic will know if and what needs to be changed. The more you change the more it costs but you don't want to do it again to fix a leak. Use the gears that the shop supplies. Follow the gear break in instructions. If you are going to get new shafts that is a good time to do it. Also a good time to do diff covers. i would go to a shop that does a lot of gears, not just "can" do them. I would visit the shop, a scrap yard is not a shop. You must have a AEV Pro-cal or something to reset the gear setting in the computer. Good luck. I need to do 4.56's someday.
I always do new bearings when I do new gears. It's too easy to damage them when you pull them so why take a chance on running damaged bearings when new bearings are easy to install and not expensive?

And I almost always do new seals around while everything is apart. It's apart so why not? The one exception was the front axle seals on my JK but I did gears at 7,000 miles so the seals were still new. The new shafts on the rear got new bearings so new seals and retainers went on. It was easier than getting the seals off the old axle shafts. I ended up being able to sell the stock rear shafts because they were still ready to bolt in.
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Old 08-09-2018, 01:56 PM   #7
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If you have a local Jeep or 4WD club, check with them and see what places they recommend. We have a local shop that specializes in high performance race car and 4WD axles and differentials. It's popular with these communities. That's where I plan to go.
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Old 08-09-2018, 03:26 PM   #8
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Currie and Dynatrac are close to me here in So Cal. Maybe just get some "bolt-on's" from one of them, complete. It's only money. Or wait for the Off Road Show here in Pomona for the 'hot deal'. Sure.....
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Old 08-09-2018, 03:41 PM   #9
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local jeep clubs are a great place for advice in your area. Another idea is to check out the local car cruises and dragstrip. They will know who can set up a diff and who can't....
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Old 08-09-2018, 03:50 PM   #10
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Thread moved.

This Forum should give you answers from your state location.

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