Author Topic: T-case removal problem  (Read 10791 times)

Offline Mario

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Re: T-case removal problem
« Reply #15 on: March 13, 2014, 11:41:49 PM »
I had a few other more pressing projects that needed my attention, but I finally finished this work.  I chose to rebuild the transfer case first since I had to disassemble it to get the TC input coupler off the transmission mainshaft.  I recently finished swapping mainshafts and replacing bearings in the NV4500 transmission.  From the photo you'll notice the condition of the splines compared to the installed new shaft.  I had a machinist cut off about 0.010" off the TC input surface that I damaged from prying on it.  In hind sight, I should have had more patience to wait for y'all's responses.  Thanks anyway!
Mario
Santa Cruz, NM
1972 C10 4x4 350 350TH NP205
1981 K20 355 NV4500 NP208 GM14SF GM10
2005 3500 Duramax Allison 5spd

Offline bake74

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Re: T-case removal problem
« Reply #16 on: March 14, 2014, 08:19:14 PM »
     So is it up and running again ?
#1: The easiest and most obvious solution to any problem is 99% of the time correct.
#2: There is no such thing as impossible, it just takes longer.
  74 k10, 77k10    Tom

Offline Mario

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Re: T-case removal problem
« Reply #17 on: April 16, 2014, 11:20:07 PM »
I've always had a real bad high speed vibration and noise, so I did a few things to remedy this while the trans and TC were down.  I added a CV joint to the rear drive shaft, and had it balanced.  I also had a bad rear pinion to drive shaft angle, so I had new main leaf springs made and re-arched the entire pack.  Then I had to figure out what height of block I needed and what angle I needed it at.  Then there were a number of incidentals that needed attention.  Anyway, today was the day that I started it back up, and went for a drive.  She ran GREAT!  I appreciate everyone's insight and knowledge sharing.
Mario
Santa Cruz, NM
1972 C10 4x4 350 350TH NP205
1981 K20 355 NV4500 NP208 GM14SF GM10
2005 3500 Duramax Allison 5spd

Offline bake74

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Re: T-case removal problem
« Reply #18 on: April 17, 2014, 07:30:15 AM »
     Glad that is is all back and working great.
#1: The easiest and most obvious solution to any problem is 99% of the time correct.
#2: There is no such thing as impossible, it just takes longer.
  74 k10, 77k10    Tom

Offline Greybeard

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Re: T-case removal problem
« Reply #19 on: May 02, 2014, 11:20:46 PM »
Normally a high speed vib is caused by incorrect phasing of the u-joints (assuming the balance weights haven't been scrubbed off somehow). Bad angles will cause a vib at any speed. However, if the phasing of the u-joints is off severely (like 90*) it may cause all sorts of problems but mostly it will jump on each rotation. The u-joints should always be lined up with one another. Even one spline off can cause noticeable problems.

One other problem I've experienced is a worn out slip. If the drive shaft can be moved sideways at the slip it won't rotate straight causing an out of balance condition although it is probably still in balance dynamically.

Just some hints to look for....YMMV
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