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Old 09-10-2018
It'sBigAl  It'sBigAl is offline
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Default ZG Diff Ratios

I blew the diff in the front of my ZJ, we're fitting a new front diff. When they put it in they reckon the diff they took out was from a "diesel" and is somehow different to what they had to go in as a replacement (which is a ZG front diff)
Does anyone know what the actual situation is as I'm not aware of any diesel ZG Grands being out here. Are they saying I had a front diff from a diesel XJ Cherokee before? That has me pretty confused all things considered.

If it's true (bearing in mind this is the word of one guy who may or may not know what he's saying) what do I do to get my truck back on the road properly Apparently they think the new diff (or maybe the old one, I'm not 100% sure) has a 3.73:1 ratio. Is that what she likely had from new, or what should it have been from new, something else?
Apparently with the new diff in it's already been driven by the mechanic and he hasn't had any problems so that makes me think it's all the same and some "expert" is speaking out of his backside as much as anything.

If anyone can shed some light on this mess I'd be most appreciative!
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Old 09-10-2018
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I have a WJ so i don't know much about ZJ's.

You can obtain a build sheet from this link, just replace the VIN with your VIN and you should be good to go.

It will tell you what it was delivered with.

https://www.jeep.com/webselfservice/...G858A83Y539160

Usually there is a tag on the diff that specifies the correct oil and the ratio that may be of assistance.

Jason
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Old 09-10-2018
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Thanks, I have that a try. It says the rear is a 3.73 but nothing about the front. I'd suggest it's likely a 3.73 as well but I honestly don't know what to believe any more.
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Old 09-10-2018
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If it's out already, count the pinion teeth, and the ring gear, divide the numbers, done

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Originally Posted by It'sBigAl View Post
Thanks, I have that a try. It says the rear is a 3.73 but nothing about the front. I'd suggest it's likely a 3.73 as well but I honestly don't know what to believe any more.
110% has to be the same ratios back to front...... as someone else said, pop the cover and count teeth
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According to both my early and late model Jeep parts catalogues the diff ratio for ZG with Quadra Trac is 3.73. No diesel ZG's came to Australia from what I can determine, only XJ's.

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Quote:
Originally Posted by It'sBigAl View Post
Thanks, I have that a try. It says the rear is a 3.73 but nothing about the front. I'd suggest it's likely a 3.73 as well but I honestly don't know what to believe any more.
It will be a 3.73, no option but to be a 3.73 or you'll hear all sorts of interesting and concerning noises when you're in 4WD.

I'd say the mechanic is speaking out of his arse, but I have known to be wrong in the past.

Jason
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Old 10-10-2018
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Diesel ZG's exist and I suspect they have the same ratio as diesel XJ's, which is 3.73.
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What everyone's said seems to confirm what I've thought. Everything in this truck is as it should be, the diffs are standard ZJ diffs and standard ZJ ratios and some know all yet know nothing mechanic reckons that because they're the same ratio as what a diesel XJ is someone's done swaps. I know diesel ZG Grands do exist, but not here and I doubt someone would ever go to the hassle of importing diffs from one.

I'll go ahead and tell the mechanic to go ahead and finish it up for me then.
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