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NP273 Chain Slack

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Old May 11, 2019 | 07:31 PM
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NP273 Chain Slack
Posted this in the transmission forum with no luck. Anyone know the spec on the amount of allowed chain slack in a transfer case? I’ve got a bit of deflection. I’d like to take care of it now if necessary. Thanks!
 
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Old May 11, 2019 | 09:42 PM
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that doesn't seem too bad, but i can't find any documentation or spec either.
 
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Old May 12, 2019 | 08:29 AM
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It’s very odd that I can’t find a manual for these....

Thanks for the response! I’ll think on some more, but a 75 chain seems like good insurance.
 
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Old May 12, 2019 | 09:36 AM
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Originally Posted by EXSwap
It’s very odd that I can’t find a manual for these....

Thanks for the response! I’ll think on some more, but a 75 chain seems like good insurance.
You already have it apart, so I agree and would do the same. Post a pic of the new one installed
 
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Old May 12, 2019 | 11:16 AM
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Originally Posted by Flyboy1100
You already have it apart, so I agree and would do the same. Post a pic of the new one installed
Will do! I’m gonna try to do a “how to” specific to changing the input shaft, but other stuff will be covered as well.
 
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Old May 12, 2019 | 07:01 PM
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Originally Posted by EXSwap
Will do! I’m gonna try to do a “how to” specific to changing the input shaft, but other stuff will be covered as well.
Git 'r done! I'm living vicariously through you until I can get back to my conversion project here also!
 
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Old May 12, 2019 | 08:13 PM
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The factory manuals have complete tear down and rebuild info. Have you looked there for the chain tension specs? My manuals are up at the farm, or I would look for you.
 
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Old May 12, 2019 | 09:22 PM
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Originally Posted by Nicmike
The factory manuals have complete tear down and rebuild info. Have you looked there for the chain tension specs? My manuals are up at the farm, or I would look for you.
Not much you'll find there guys.

From my 2003 MY Excursion Ford factory manual set, section 308-07B contains no notice of tension, Step 34 only mentions 'Install the drive sprocket, the driven sprocket, and the drive chain as an assembly.'
 
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Old May 12, 2019 | 09:57 PM
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So, it is either "you like what you have" or "buy a new one"....no tensioner device.
 
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Old May 12, 2019 | 10:11 PM
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Definitely no tensioner. And from what I’ve read, the chain getting loose and getting into the case is the major cause of grenaded transfer cases. I’ve looked several times for a rebuild manual as they normally have a spec like this, to no avail. I don’t have the ford shop manuals, but sounds like they wouldn’t be much help....I wonder if Allstate gear would tell me.
 
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Old May 12, 2019 | 10:12 PM
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Originally Posted by Nicmike
The factory manuals have complete tear down and rebuild info. Have you looked there for the chain tension specs? My manuals are up at the farm, or I would look for you.
i looked in mine, didn't see anything
 
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Old May 13, 2019 | 09:35 AM
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Thanks for the additional info guys!

I also wonder if maybe @Mark Kovalsky or @pirate4x4_camo would know of a source for the spec. Gents, any insight?

In any case, new chain ordered today. Hopefully I'll have it by end of week and I can get this thing out of my garage and to the X for mockup and eventual install. Still lots of work to do!!
 
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Old May 13, 2019 | 09:48 AM
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factory manual would have been my suggestion and that didnt pan out.

the only thing i have ever done to a chain drive Tcase is blow them up and replace it with a junkyard unit. chain drives are like Bic lighters to me

all my T-case rebuilding or modifying experience is with gear driven units.
 
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Old May 13, 2019 | 10:15 AM
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Originally Posted by pirate4x4_camo
factory manual would have been my suggestion and that didnt pan out.

the only thing i have ever done to a chain drive Tcase is blow them up and replace it with a junkyard unit. chain drives are like Bic lighters to me

all my T-case rebuilding or modifying experience is with gear driven units.
Part of me knew that would be the case...

Thanks!
 
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Old May 13, 2019 | 10:48 AM
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you already have a new chain enroute so install it but that one doesnt look bad to my eye.

if I was rebuilding one and really wanted to know the spec rather then use my eyecrometer and guess i would call these guys.

https://torqueking.com/product/50255...-ford-gmc-ram/
 
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