I just got the NP205 in, with a new driveshaft. This is coming from a 203. So, when either going from no throttle to moderate throttle (in low rpms) or from moderate throttle to no throttle, there is a pretty bad knock. Also does it going from park to reverse or from reverse to drive. It does it in either 2H or 4H. Please note that I don't have a front driveshaft on yet. Could this be part of the problem? I'm almost positive it's coming from somewhere near the transfer case. Feels like there is slack there but I can't isolate the problem. Also, it has a rebuilt t350. The new driveshaft has spicer yoke etc. and the 205 has new seals and hardware as well. By the way, there was no such knock with the 203. Maybe it's normal, but it sounds a little excessive to me and I don't want to ruin any of these new parts! Thanks for any insight.
CK5
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Harsh knock when letting off gas...NP205
- Thread starter wy4tt
- Start date
RustBuket
1/2 ton status
New ujoints as well? Could be diff gears giving up.
Yep, new u-joints as well. Pretty much everything is rebuilt or new. When in park and no pressure is on the drivetrain, I can roll the driveshaft back and forth about half an inch or so. The clank seems to come from the area between the txfr case and trans. My buddy's does it as well (mostly same setup) but his driveshaft doesn't have quite as much slack in it. Maybe it's normal?
I'm going to guess you have a bad drive sleeve. They pretty commonly wear out the splines which would give you a clunk sound when getting on or off the gas.
Thanks for the replies guys.
4x4High, is the drive sleeve an expensive replacement? I'm not sure what it is. It's in the txfr case? Also, can driving it like that cause damage to other hardware? Thanks again. I'm new at this, so your advice is a big help.
4x4High, is the drive sleeve an expensive replacement? I'm not sure what it is. It's in the txfr case? Also, can driving it like that cause damage to other hardware? Thanks again. I'm new at this, so your advice is a big help.
big83chevy4x4
3/4 ton status
the drive sleve is what connects the transmission output shaft to the transfercase input shaft. this was also the same thing i thought of after reading your post.
i think you can get a new one for around $75, sometimes ive seen them on ebay for $50 or less.
i think you can get a new one for around $75, sometimes ive seen them on ebay for $50 or less.
FWP
CRS
Did you replace the 203 with a 205, or did you do the doubler thing? What else did you change besides t-case config?
FYI, the 205 has ALOT of gear slop. If there is ANY driveshaft angle issues, you WILL hear it in the 205.
FYI, the 205 has ALOT of gear slop. If there is ANY driveshaft angle issues, you WILL hear it in the 205.
Replaced the 203 with the 205, no doubler. Had the 205 setup for a t350. It already had a 4" lift. The entire driveline is pretty much replaced (14ff, D60, driveshaft, etc.) As I mentioned before, there is no front driveshaft on right now.
TrcksR4ME
1/2 ton status
Do the 27 spline drive sleeves get that much slop in them? I thought this was more of a problem with the 10 spline sleeves 
I have a 30 year old NP 205 for a th350 and when I took the adapter apart the drive sleeve had no visible wear.
__________________
'77 K5, Warn M8000, 402/350/203, 44/14bff, 4"/36" Irok's
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I have a 30 year old NP 205 for a th350 and when I took the adapter apart the drive sleeve had no visible wear.__________________
'77 K5, Warn M8000, 402/350/203, 44/14bff, 4"/36" Irok's
http://www.krazyk5.com
http://community.webshots.com/user/trcksr4me
http://community.webshots.com/user/trcksr4me2
FWP
CRS
Ah, so now your driveshaft is longer right? The 205 is much shorter than the 203. That means your driveshaft angles changed. Might want to look into it.
It's longer. It fits snug. The slop sounds like it's between the trans and the 205, apparently where the drive sleeve is. It's not on the rear of the 205, u-joint, etc. Not sure if that has anything to do with the angle or not though.
FWP
CRS
Rob(therobzilla) and I have been through hell a couple years ago trying to figure out the cause of the 205 case noise (similar to what you describe). It's the wierdest damn thing, you can have perfect parts throughout the drive train, and it still makes racket. Driveshaft vibration at or near coast would transfer into the 205 gears. The solution was a rear CV driveshaft.
In searchin for the Solution, I found an old post on Pirate, in which Jess (HAD) replied, saying gear slop and bad angles. Too bad I skipped right over it, I should have payed attention, it would have saved Rob an I whole bunch of headaches.
Good luck!
In searchin for the Solution, I found an old post on Pirate, in which Jess (HAD) replied, saying gear slop and bad angles. Too bad I skipped right over it, I should have payed attention, it would have saved Rob an I whole bunch of headaches.
Good luck!
27 spline is going to be much stronger than a 10 spline, so realistically it should have much less wear over the same period of time/use.
Drive sleeve is still a dumb idea IMO (and GM's apparently, since they quit using them later on in production) but if you have one, I'd not worry nearly as much about a 27 spline one as I did my 10 spline.
Drive sleeve is still a dumb idea IMO (and GM's apparently, since they quit using them later on in production) but if you have one, I'd not worry nearly as much about a 27 spline one as I did my 10 spline.
garlicbreath
1/2 ton status
It's prolly ok, but have you gone back and retightened all the crossmember and t-case mounts?
