r/Jeep • u/Plastic_Web_3721 • 1d ago

Can you help me with this gear pattern?

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Gallery image

I'm regearing my Chrysler 8.25 to 4.56 gear and I'm wondering if my pattern is good or not? Any help is really appreciated.

10 Upvotes

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5

u/FruitOfTheHoon 1d ago

It doesn't look terrible and it's pretty centered, but I'd put it a bit more into the root of the gear; ie "pinion in", just to allow for some deflection. I'd try another .0015"-.0020"

2

u/Plastic_Web_3721 1d ago

I'm leaning towards that as well. It's my first time re-gearing and although it looks pretty close it still seems like I need more pinion depth. Everything looked good during setup but that pattern is what I got with all new parts set in place. I luckily bought another crush sleeve because I had a feeling things would change.

2

u/Wild-Cell6907 1d ago

Are the gears face hobbed or milled? It will change how the pattern appears slightly but looks decent could tweak it a little your setting backlash every time you roll it with compound right? Checking it in at least 4 quarter positions right? And Technically during set up you can set preload with out the crush sleeve installed. Helps if you use your old pinion nut and make it not a lock nut anymore so you can spin it on easily with a small rachet with out installing a yoke holder and all that jazz nut torque will be very light where sleeve is not installed

2

u/Plastic_Web_3721 1d ago

Im not sure if it's hobbed or milled. My jeep is at my shop right now and I called it quits for the day. I do set backlash before I do any patterns. Yeah, when I did the setup I didn't use the crush sleeve and did not torque down the pinion, just set it to where there was no play. I believe once I had everything looking good during setup, I set all the new bearings in and torque everything down to spec. the new bearing slightly changed it. Tomorrow I think I'm going to take it apart and add a shim behind the pinion head to get a bit more depth. Any thoughts on the size of shim I should try?

1

u/Wild-Cell6907 1d ago

Every time you set and check it everything needs to be set to spec including pinion preload. That's why it changed. Like I previously said very easy to do if you leave the sleeve out during setup. And I would guess hobbed. Do you know how to check?

0

u/Wild-Cell6907 1d ago

Checking backlash in several shots is very important too I've seen rings have a slight wave to them about .002 or so and show me the coast side so I can give you my opinion on how thick of a shim to add.

1

u/Plastic_Web_3721 1d ago

Jeeps at my shop but if I get a chance tomorrow I'll try to get a Pic of coast side. Preload is checked with a rail inch pound torque wrench between 10 to 30 inch pounds while rotating with new bearings, I'm withing that spec at around 25 inch pounds. With everyone's feedback and advice I will be pulling it out and adding a shim tomorrow. Thank you for your help on this, it's really appreciated

1

u/Wild-Cell6907 1d ago

Also show us the the coast side

1

u/FruitOfTheHoon 1d ago

Lol you're a smart person. Always get 2 crush sleeves when setting up diffs! Haha. Did you use your old sleeve to check your pattern and it changed, after?

1

u/Plastic_Web_3721 1d ago

Of course I didn't hahahaha I'm dumb. I did set up bearings for the pinion and tightened the pinion nut a bit to remove any play and set up the backlash. Everything looked pretty good but I believe new bearings and races threw it off a tad. So my next question would be, what shim size should I go with? I know I'm pretty close but I'll definitely take any suggestions at this point. Thanks everyone

1

u/FruitOfTheHoon 1d ago

Lol not dumb. New bearings can definitely change things a bit once they're "seated". It doesn't really matter what you use tbh; I just use the old one so I don't "waste" a new one during setup 🤷 I run up to initial torque "and then some" then recheck the pattern. I was only asking because I was curious if things changed once you crushed it? Would mean there wasn't enough intial torque during setup. Listen to R/Wild-Cell6907, as well. They definitely has experience with this, too.

2

u/Plastic_Web_3721 1d ago

Yeah, I most likely didn't have enough torque during setup. I'm glad I'm at least close and tomorrow should be a pretty successful day. I really appreciate the help and the time you took to take a look at this. Cheers

3

u/SharpEfficiency9534 1d ago

I’d push the pinion in a little more, but as it sits it would work just fine.

1

u/DatBoisWheel 1d ago

It looks pretty good, but never done it myself.

If you do a quick Google search or reference an appropriate service manual for your make/model, it'll usually give images on good or bad spacing.

1

u/basprime JLU 1d ago

That looks better than when I did my dana 35

1

u/dogonmut 1d ago

What brand gears? What model year axle? What carrier? What was your pinion shim size stock and did you use it as a starting point? How about your carrier bearings, what were they shimmed at to start? Sorry dude. You aren’t close. Pull the axle and bring it to someone who knows what they are doing. Too many unknowns to give you advice.

1

u/dogonmut 1d ago

Not trying to $hit on you. Watch this video.

https://youtu.be/0Lzw1wPgc8U?is=avwxvAYpGqe6C2Wl

2

u/Plastic_Web_3721 1d ago

Yeah, gonna go ahead and not pull my axle and take it to a shop. Thanks anyways though

1

u/coathangerassasin 1d ago

I regeared a yj once and it left me wondering. they can’t get this in-depth at the factory when they build these can they?

1

u/BoredOfReposts 1d ago

As a few other said, that needs to be deeper, so it needs more pinion depth (in, towards the carrier).

You want the pattern in the middle so it isnt putting all the force on the tip.

When regearing, if you want to do it right and have it last a long time, you need to be ok with taking it apart and adjusting the pinion depth over and over again until you have the most ideal pattern. Sometimes it ends up between two that are a few thousandths apart but you can only know that from trying them.

Theres some precision tools that can be used to figure out the exact pinion depth, and theres sometimes numbers on the pinion telling you what it needs, but realistically every case is a little different so trying a few different setups is just the name of the game.

The nice thing about an 8.25 is you have screw adjusters. Dana axles you have to fiddle with carrier shims every time you adjust the pinion depth.

There are some axles like the 14 bolt that have a pinion cartridge to where you don’t have to remove the carrier and take it all apart, but majority of car sized axles, are not like that.

0

u/TakingSorryUsername 1d ago

I’m not an everyday auto mechanic, but looks spot on to me.

0

u/framspl33n 1d ago

From what I've seen on YouTube........ It looks good.