Regeared to 4.56...Now in the initial break in period...Any tips? - Jeep Wrangler Forum
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Old 10-10-2018, 07:32 PM
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Regeared to 4.56...Now in the initial break in period...Any tips?

I just picked up my D44-Rear D30-Front G2 regear job from 4WeelParts in Van Nuys. Everything is sounding\driving great so far ~30miles.

Does anyone have any tips for this initial 500mile break in period? I have been told to listen for any whining from the differentials and to make sure there is no overheating but that is pretty general.

This is the Kit they put on :

https://www.4wheelparts.com/p/g2-jk-...-FCNB-4-JK-456

With these front and rear Diff covers :

https://www.4wheelparts.com/p/g2-axl...FCNB-40-2033AL

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Old 10-10-2018, 08:19 PM   #2
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I’m sure plenty of people will chime in on this topic. My diff shop told me to stop after the first 15 to 20 miles and let the diff cool down. Try not to tow anything for the first 500 miles. Change the oil at 500 miles. Be careful not to overheat the gear oil.

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Old 10-10-2018, 10:14 PM
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Originally Posted by Leadnut View Post
I’m sure plenty of people will chime in on this topic. My diff shop told me to stop after the first 15 to 20 miles and let the diff cool down. Try not to tow anything for the first 500 miles. Change the oil at 500 miles. Be careful not to overheat the gear oil.
-"My diff shop told me to stop after the first 15 to 20 miles and let the diff cool down"

Same here...I was able to do this at 20 miles exactly

-"Try not to tow anything for the first 500 miles."

No trailer so not a problem

-"Change the oil at 500 miles."

4Wheel Parts has me scheduled for this fluid change already in 9 days so shouldnt be a problem.

Thanks for chiming in! Some Pics :





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Old 10-10-2018, 10:21 PM   #4
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As above drive it easy. If you have to get on the freeway follow a semi. Keep the rpms low while the gears cut.
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Old 10-10-2018, 10:26 PM   #5
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I need to regear soon so I cannot give advice. If you don't mind, about how much did it cost parts and labor?

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Old 10-10-2018, 10:33 PM   #6
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Same person also told me that the front will not break-in sufficiency with just the wheels turning the gears (i.e. no engine load). That I should wait to change the front gear oil until after I put some 4WD miles on.
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Old 10-10-2018, 10:34 PM
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I need to regear soon so I cannot give advice. If you don't mind, about how much did it cost parts and labor?

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2000$ but i needed the new carrier since I was running 3.21 gears...If you are running 3.7+ you dont need the carrier and can save 90$
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Old 10-10-2018, 10:43 PM   #8
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Thanks! I have the 3.73. About what I expected as far as price. I would not mind spending 2K if it is done right with some sort of warranty.
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2000$ but i needed the new carrier since I was running 3.21 gears...If you are running 3.7+ you dont need the carrier and can save 90$
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Old 10-10-2018, 11:16 PM
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Same person also told me that the front will not break-in sufficiency with just the wheels turning the gears (i.e. no engine load). That I should wait to change the front gear oil until after I put some 4WD miles on.
my 4-wheeling is about 4 times in summer\fall but that's maybe 30 miles total in 4 Low. About 1 week total during the winter up in the mountains\snow. I will try to keep track of 4wheeling mileage too and change the front after maybe 100 4-wheel miles.
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Old 10-11-2018, 03:38 AM   #10
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Most people here have it right. The WORST thing you can do is freeway driving for the first 500 miles. You need to vary your speed, dont tow anything and get the diff fluid changed to remove any metal shavings as well. Been through this rodeo 3 times.

Cost to re-gear for me $1000 to 4.10 gears - 35 inch tires. I did regret not going to 4.56...dont fear the gear!
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Old 10-11-2018, 03:39 AM   #11
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Thanks! I have the 3.73. About what I expected as far as price. I would not mind spending 2K if it is done right with some sort of warranty.

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$2000!!!??? You got taken my friend.
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Old 10-11-2018, 05:27 AM   #12
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I use and recommend East Coast Gear Supply's break in procedure

No more than 15-20 minutes on the initial run then cool completely

Then drive easy for no more than 50 miles at a time without a cool down cycle (25-30 minutes)

Vary speeds every 5-10 minutes

No towing 1st 500 miles

Change diff oil.

They have a tow break in procedure as well. They told me not to worry about that as it was designed for vehicles that were gonna a lot of miles and heavy weight. Not our Jeeps....

The above has worked perfectly for me through 4 regears.
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Old 10-11-2018, 08:02 AM   #13
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$2000!!!??? You got taken my friend.
No, that is a normal price in some parts of the country, including around here.
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Old 10-11-2018, 10:15 AM   #14
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Cost to re-gear for me $1000 to 4.10 gears - 35 inch tires. I did regret not going to 4.56...dont fear the gear!
$1000 for parts and labor is very low. Cost in my town is $600 to $700 labor per axle plus parts. I have checked with multiple differential shops.
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Old 10-11-2018, 10:29 AM   #15
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As the others have said - 500 miles with light to medium loading.
Also, I break em in with straight 90w non-synthetic. Change to 75w140 synthetic after that.
I also replace axle seals at this time also, since they are relatively inexpensive and easy to get them swapped since the axles are out. Same holds true for any U-joints that may be getting sloppy...


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$2000!!!??? You got taken my friend.
You’ve done a lot of gear swaps have you?
I know I have and the tooling alone is pretty costly, not to mention it being an absolute time consuming pain in the posterior all the while getting bathed in sulphur stinking hypoid gear oil, sometimes it has been overheated which makes it really extra-special.
But, we should really perform these services for free since we’re all part of the Jeep family and can pay the rent and buy tools with donated beer....
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Old 10-11-2018, 11:27 PM   #16
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$1000 for parts and labor is very low. Cost in my town is $600 to $700 labor per axle plus parts. I have checked with multiple differential shops.

Wow, guess I got lucky...normally Im the one that always pays more. Regardless its a GREAT mod, that and a pedal commander.

yes, done 3 gear swaps, well... I didnt do the work because I like a running jeep. Im guessing prices have gone up since my last one 18 months ago. Chinese parts arent as cheap as they used to be.
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Old 10-11-2018, 11:46 PM   #17
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Most all the R&P gears are made in South Korea.
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Old 10-12-2018, 08:51 AM   #18
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US Gear is based here in US and makes their gears here. Not sure if they are doing gears for D30 or D35, but I know they do D44 (Vette) and D60 as well as Ford 9”, Mopar 8-3/4”..

https://www.usgear.com/about/about-us-gear
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Old 10-26-2018, 07:45 PM
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Just picked up from the 500mile fluid swap and inspection. Everything went great and Im back to fwy driving.

Loving the 4.56 regear with 35's and 2in lift.

I would totally recommend 4Wheel Parts Van Nuys to anyone on this forum for re-gear work.
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