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09-10-2018
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Senior Newbie
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Join Date: May 2016
Posts: 84 What Jeep do I drive?: ZJ
Likes: 2
Liked 19 Times in 14 Posts
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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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09-10-2018
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Rock Munki
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Join Date: Aug 2009
Location: Castle Hill, NSW
Posts: 2,136 What Jeep do I drive?: WG
Likes: 11
Liked 300 Times in 245 Posts
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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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09-10-2018
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Senior Newbie
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Join Date: May 2016
Posts: 84 What Jeep do I drive?: ZJ
Likes: 2
Liked 19 Times in 14 Posts
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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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09-10-2018
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Established Member
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Join Date: Jul 2015
Location: Adelaide
Posts: 2,079 What Jeep do I drive?: WK2
Likes: 2,508
Liked 991 Times in 632 Posts
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If it's out already, count the pinion teeth, and the ring gear, divide the numbers, done
Sent from my SM-G930F using Aussie Jeep Offroad mobile app
__________________
I drive over stuff!!!!
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09-10-2018
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CrawlerStar
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Join Date: May 2017
Location: Victoria
Posts: 454 What Jeep do I drive?: XJ
Likes: 259
Liked 86 Times in 64 Posts
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Quote:
Originally Posted by It'sBigAl
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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110% has to be the same ratios back to front...... as someone else said, pop the cover and count teeth
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09-10-2018
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Newbie
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Join Date: Jan 2012
Location: Victoria
Posts: 34 What Jeep do I drive?: ZJ
Likes: 0
Liked 4 Times in 3 Posts
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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.
Denis.
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09-10-2018
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Rock Munki
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Join Date: Aug 2009
Location: Castle Hill, NSW
Posts: 2,136 What Jeep do I drive?: WG
Likes: 11
Liked 300 Times in 245 Posts
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Quote:
Originally Posted by It'sBigAl
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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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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