NP242 Full Time 4WD feels like Part Time - Page 3 - JeepForum.com

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post #31 of 34 Old 09-19-2013, 07:02 PM
shaban
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1996 ZJ 
 
Join Date: May 2012
Location: Yarraville
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Actually, both axles are supposed to be the same, it's going to bind hard and overstress the drivetrain otherwise. All 4WD's have the same ratio back and front, and also thats why you're supposed to have all 4 tyres same size (at least on 249 tcase).

Check the tags with numbers on both differentials, first 3 numbers on second row tell the ratio (355 stands for 3.55, 373 for 3.73)

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post #32 of 34 Old 09-19-2013, 07:32 PM Thread Starter
kb9mfd
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1995 ZJ 
 
Join Date: Dec 2012
Location: Janesville
Posts: 148
Quote:
Originally Posted by shaban View Post
Actually, both axles are supposed to be the same, it's going to bind hard and overstress the drivetrain otherwise. All 4WD's have the same ratio back and front, and also thats why you're supposed to have all 4 tyres same size (at least on 249 tcase).

Check the tags with numbers on both differentials, first 3 numbers on second row tell the ratio (355 stands for 3.55, 373 for 3.73)
That is what I thought, but I heard different before. Both of them start with a 55 on the second line, They are rather hard to read. - Jeremy
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post #33 of 34 Old 09-20-2013, 12:34 AM
shaban
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1996 ZJ 
 
Join Date: May 2012
Location: Yarraville
Posts: 571
Well, you could use a metal brush to scrape these tags a bit if you want, often the first digit is under a bolt head.
Heres what my front one off an XJ said (it's a 3.55) :

52069199
3.55 610504-7

3.55's are somewhat unusual for ZJ's, they're mostly 3.73 as far as I know.

Heres one photo of a tag, not mine though:
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post #34 of 34 Old 09-20-2013, 06:33 AM Thread Starter
kb9mfd
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Quote:
Originally Posted by shaban View Post
Well, you could use a metal brush to scrape these tags a bit if you want, often the first digit is under a bolt head.
]
Well, being I can read the "55" I assume the 3 is under the bolt head. Both would be the same so I guess that is not an issue. From what I googled, the '95 with a I6 3.55 was the most popular, with 3.73 used in the V8 and towing packages. Maybe I will just have to take that TC apart and see if there is a reason it gets stuck in PT. maybe there is some uneven wear that causes it not to shift out when it is bound, or a spring is bad. - Jeremy
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