. . =3D=3D=3D=3D=3D =3D=3D=3D=3D=3D NP-208 Transfer Case HELP!! Group: alt.autos.4x4.chevy-trucks Date: Wed, Jul 7, 2004, 12:53am (CDT+5) From: snipped-for-privacy@verizon.net (Cheryl=A0and=A0Rob)
Had a clunking sound in my driveline downshifting from 2nd to 1st
it turned out that I have a 1 ton pinion youke and I put in the wrong universal joint; which was a little smaller and it allowed for some play; causing this "clunk".
Anyway I got the right u-joint and it seemed to quiet it down some, but it is still there somewhat.
The truck just jerks and continues to decelerate, making a banging noise.
The mechanic I took it to said that my transfer case chain might be loose.
Being a 208 I think this is gear driven and not bands...... anyway I was just wondering what I should expect paying for them to tighten the chain up a bit. I don't know of any other symptoms which would help in determining if it is indeed the chain or not; so ANY input is appreciated. I hope it doesn't cost that much, so if anyone has any ideas, PLEASE let me know
.. it is an 87 K-5 Blazer 350 TBI NP-208 transfer case w/ Yukon 4:56 gearing. 700R-4 auto trans as well....
THANKS IN ADVANCE GUYS!! =A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0= =A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0= =A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0= =A0 =A0=A0=A0=A0=A0=A0Rob
=3D=3D=3D=3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D=3D=3D Rob, do yourself a favor,
Ask around and find yourself a good, honest, transmission shop. Carry the truck in and let them take a look at it for free. They should be able to pinpoint the problem area for you without any guess work involved.
How many miles on the tranny?
Has anyone ever rebuilt the trans?
Is it making the downshift clunk on decelleration or during "kickdown" for passing?
How does the 3-4 shift feel?
anywhooo....
A 2-1 downshift clunk is a known symptom for a sick 700r4, and sometimes even on one that's just been rebuilt.......ooops. A clunk in the tranny is going to be accentuated throughout the driveline. Meaning if you have play in the rear end, transfer case, driveshaft, or mounting.......it's going to show up even more with a harsh downshift from the tranny. To put this in perspective, if the trans was shifting nice and smooth......then there wouldn't be any harsh forces at play to make the other areas in the driveline engage sharply. You could yank the driveshaft off and put the unit in 4 high and see if the clunk went away, but.....wouldn't it be easier to let someone else figure it out for free?
It wouldn't hurt to go get that free opinion, and unless someone is allowed to drive it, that's use to dealing with the symptom on a DAILY basis, all your going to get is guess's.
GUESS'S : Differential Driveshaft Transferr Case Trans mount Transmission
now..... do you actually want to keep crawling under that sucker?
MarshMonster ~this buds for me~ =3D=3D=3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D=3D