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post #1 of (permalink) Old 10-09-2002, 06:36 PM Thread Starter
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NP208 low range sounds

Is a NP208 supposed to make a whining sound when in low range? It sounds similar to what hypoid gears sound like when run backwards (man trans in reverse). I expected noise, but not this much. I mean, at say 5mph it's definitely louder than my exhaust.

My truck has probably never been in 4low before. When I gutted the floor this summer there was still assembly lube where the shifter would go if put in 4low.

I've only seen NP241s and NP205s in action, and neither of them are as noisey as mine. I'm just curious if I should be looking for a new transfer case. In 4high it doesn't make any noise unless I'm on dry asphalt (duh).
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post #2 of (permalink) Old 10-09-2002, 06:44 PM
 
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Re: NP208 low range sounds

The one in my big truck whines in 4lo, but not that loud. I mean, at 5mph you can definately hear it in the cab, but doesn't sound abnormally loud to me.

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post #3 of (permalink) Old 10-09-2002, 07:20 PM
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Re: NP208 low range sounds

my NP208 is quiet also, little noise nothing severe.
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post #4 of (permalink) Old 10-09-2002, 09:05 PM
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Re: NP208 low range sounds

id check the fluid right now, might be low, or somone tryed to put it in 4low on the move and ground up the gears some, but id get the 30 mm socket out and the 1\2 ratchet and take off that check\fill bolt on the back of the t-case and check the fluid. wish the you best of luck with it.
post #5 of (permalink) Old 10-09-2002, 09:26 PM
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Re: NP208 low range sounds

now that you bring it onto me, there is a oil additive that you can try to "quiet" the noise, cant remember what it was, but if i think of it i will post it. [img]images/graemlins/wink.gif[/img]
post #6 of (permalink) Old 10-10-2002, 07:02 AM
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Re: NP208 low range sounds

They whine in low range, it is normal.
post #7 of (permalink) Old 10-10-2002, 08:19 AM
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Re: NP208 low range sounds

both my 208s I ran and my 241 I have now make a whine in lo range. I wouldn't be too worried. You might pull the fill plug then stick your finger in the case adn see how tight your chain is. Make sure it has lube too. The biggest cause of failure on these is lack of lube.
post #8 of (permalink) Old 10-10-2002, 02:15 PM Thread Starter
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Re: NP208 low range sounds

I was just curious because mine seems a bit too loud. I expected noise and a fair amount but I didn't think it'd be that loud.

I imagine the chain is a little sloppy but you can't even hear the transfer case in 4high when traveling at 45mph. The lube gets checked pretty regularly since I have a leak between the case havles behind the torque bar.

Since we're on the subject of breaking things, just how strong is a NP208? Will my transfer case or transmission fail first? I'm talking doing something like driving up to something 12" tall and trying to power over it. I know my transmission can handle it but can my transfer case?

I've never had a NP208 apart before but I've had a 231 apart and they look mighty wimpy inside. Granted, the 231 is for s-series but I imagine they're comparable.

Yeah, I'm paranoid. I don't need to be breaking my transfer case.
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post #9 of (permalink) Old 10-10-2002, 02:19 PM Thread Starter
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Re: NP208 low range sounds

GM recommends a pint of 80w.
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post #10 of (permalink) Old 10-10-2002, 02:22 PM Thread Starter
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Re: NP208 low range sounds

I check my fluid about every two weeks because I leak some between the case halves behind the torque bar. It might have been abused before since it was about a quart low when I got it and the transmission was a quart over.

I don't think it'd ever been in 4low. There were no marks from it ever being there and that slimey grease GM uses to lube things during assembly was in the track where the shifter would go. Not to mention when I first got it you couldn't put it in 4low because everything was so dry the lever wouldn't move to the right.
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