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Old 01-17-2013, 02:59 PM   #1
ahale2772
 
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NV4500 main shaft preload

can anyone tell me the proper pre load or endplay on an nv main shaft?

I'm told there is a secret to doing it the right way, yet my searching has turned up nothing.

would appreciate an answer asap, as the transmission is hopefully going back together tonight.

thanks in advance
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Old 01-17-2013, 03:07 PM   #2
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The factory spec is 0.002-0.006" end play, there should be shims at the rear bearing to adjust if necessary
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Why in God's name would ANYBODY want to take something with that collection of gizmos, wheelies, belts, string, plastic and obvious fall-offs out of the sight of land?
 
Old 01-17-2013, 03:09 PM   #3
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but is the factory spec what keeps them together? ive heard multiple times that "setting them up the right way" is what can help keep 3rd gear from blowing apart.
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Old 01-17-2013, 03:33 PM   #4
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This is a valid question that I am not 100% sure on. I have never done it on a truck with higher than stock-ish hp just the work hogs around the shop

I have always got it to .003" of endplay on the main and counter and haven't had any issues yet, just make sure everything is facing the right way like your synchros and collars and if you changed any bearings just double check your endplay cause new parts can change what you originally had.
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Old 01-17-2013, 03:42 PM   #5
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No amount of end play can save third gear failures especially when pulling in that gear.
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Old 01-17-2013, 03:58 PM   #6
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I do not expect it to, but if setting the transmission at 0 endplay makes it happier, then i aim to do that
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Old 01-17-2013, 04:47 PM   #7
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Closer to 0 the better
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Old 01-17-2013, 06:47 PM   #8
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The tranny shop told me with the Trans in neutral, one hand on the input you should be able to turn the output shaft. But it shouldn't be so tight that you couldn't hold the output with your other hand to stop it from turning.
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Old 01-17-2013, 06:51 PM   #9
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depending on where you got your parts and what shims you got..... Probably the closet you can get it is .003 maybe .002 if your lucky
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Old 01-17-2013, 07:24 PM   #10
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Quote:
Originally Posted by ILLINOISRAM View Post
The tranny shop told me with the Trans in neutral, one hand on the input you should be able to turn the output shaft. But it shouldn't be so tight that you couldn't hold the output with your other hand to stop it from turning.


That is pretty vague when you have .004" to play with, and there are way too many variables to really consider this the "correct way" of doing it.
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Old 01-17-2013, 08:36 PM   #11
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I think I'll be setting it as close to 0 as i can.

i went through this when building my last GRTRAG, went through a set of bearings in under 10k miles when i set it too tight.

not looking to do this one the wrong way
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Old 01-17-2013, 08:40 PM   #12
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Yes anything tighter than zero will cause premature bearing failure I know first hand
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Old 01-17-2013, 08:50 PM   #13
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gotcha, thanks
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Old 01-17-2013, 08:56 PM   #14
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[QUOTE=ChuMaDD;1988661]

That is pretty vague when you have .004" to play with, and there are way too many variables to really consider this the "correct way" of doing it.[/

True but I never said this is the correct way to set it up. Just if you set your preload right this is what you would find so if a person was in a pinch or hurry this would give you some idea if your close. I have broke lots of Trans set up loose, tight, spec didn't matter. The one in the puller was thrown together in a last minute Trans repair and it has lasted the longest so far.
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Old 01-18-2013, 03:43 PM   #15
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set it at .001! thanks for all the advice!
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