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 Post subject: Bad t-case?
PostPosted: Mon Oct 06, 2014 2:50 pm 
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Rogue
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Joined: Mon Nov 18, 2013 5:12 pm
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Location: Michigan
So i've been trying out my 4x4 after reinstalling my tcase, it was recently inspected by a shop and check out good. When I switch 4x4 on it i get a lot of vibration under the seat and some noise, then once i get around halfway to 55 mph and whole car thunks to where I can see my shifter move and it drives fine after that. just today i was showing a friend the problem and I was backing out of a parking spot in 4x4 and it made a very loud bang that shook the car to where i thought the driveshaft broke, it still all looked normal underneath.
I just had two new CV shafts put in and new diff oil too. The drive shaft seems to be in sturdy and supposedly had new joints put by the last owner. Does this sound like it might be an internal issue? Before it was out it worked fine aside from having less than a pint of oil in it.

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Alpine sound system

And the vacuum gauge reads zero


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 Post subject: Re: Bad t-case?
PostPosted: Mon Oct 06, 2014 3:26 pm 
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Eagle

Joined: Thu Feb 07, 2013 6:43 pm
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I wonder if the gear ratio for the front and rear differential are different?

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 Post subject: Re: Bad t-case?
PostPosted: Mon Oct 06, 2014 6:14 pm 
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Javelin
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Location: Fayetteville, TN
I would make sure that the vacuum motor is putting it all the way into 4wd.


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 Post subject: Re: Bad t-case?
PostPosted: Sun Oct 12, 2014 9:24 am 
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Hornet
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Location: North Seattle sort of
If the front and rear are the same ratio and tires are the same size, maybe the chain is too sloppy. I recently tore apart a NP129 and have the internals for sale, including the viscous coupler.

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 Post subject: Re: Bad t-case?
PostPosted: Fri Feb 13, 2015 1:28 am 
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Rogue
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Location: Michigan
A little update. A few weeks ago I had the inner part of my driver side CV shaft break trying to get out of a snow bank in 4x4, luckily it didnt take anything out with it. I ended up taking the rest of the shaft out and rigged my Eagle to get to work and back that day and out of curiosity engaged 4 wheel drive. That vibration/noise issue wasn't there anymore. A week later with a new drivers side CV installed I tried 4 wheel drive again and the issue returned. So im thinking my diff or engine are misaligned causing that CV to bind? Even more odd sometimes I can be sitting in park idling and it sounds like the driveshaft to the front diff is disconnected and vibrating on the crossmember (sound right under the drivers seat or foot well). Nothing looks off or feels loose.

Is this an issue with cv angle or possibly something related to worn engine mounts?
Im kinda stumped

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'86 Eagle wagon limited
2150 carb
TFI coil
Omix valve cover
Alpine sound system

And the vacuum gauge reads zero


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 Post subject: Re: Bad t-case?
PostPosted: Fri Feb 13, 2015 11:11 am 
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Hornet
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Location: North Seattle sort of
If the front diff or motor was changed and bracket on pass side not swapped with it, the axle gets tipped.

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 Post subject: Re: Bad t-case?
PostPosted: Fri Feb 13, 2015 11:54 am 
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Javelin
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Location: manitowoc wi
carnuck wrote:
If the front diff or motor was changed and bracket on pass side not swapped with it, the axle gets tipped.


Never had that problem, and 2 of my eagles have the 4.0 engine block.

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 Post subject: Re: Bad t-case?
PostPosted: Sat Feb 14, 2015 2:14 pm 
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Rogue
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Posts: 55
Location: Michigan
carnuck wrote:
If the front diff or motor was changed and bracket on pass side not swapped with it, the axle gets tipped.


Neither of that was swapped. Only things changed were replacing the old original cv and transmission rebuild

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'86 Eagle wagon limited
2150 carb
TFI coil
Omix valve cover
Alpine sound system

And the vacuum gauge reads zero


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 Post subject: Re: Bad t-case?
PostPosted: Sun Feb 15, 2015 5:39 pm 
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Hornet
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Location: North Seattle sort of
Then I don't know how the angle changed unless something is bent.

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 Post subject: Re: Bad t-case?
PostPosted: Mon Feb 16, 2015 1:15 am 
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Rogue
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Joined: Mon Nov 18, 2013 5:12 pm
Posts: 55
Location: Michigan
Is the Axle supposed to have some flex? I did notice when I was tightening/loosening the bolts for the cv that the axle flexed forward and backwards caster wise but I figured thats normal. IIRC some rods that attach to the axle and diff that looked like a caster adjustment for it.

And for that matter could it just be the front driveshaft NEEDS to be filled with grease? Becuase a whole gob came out the the end when i pushed it back a little when I dissembled it to remove the tcase and tranny. I did put some more in when I put it together but didnt fill the whole shaft tube. I imagine the shaft would maybe keep the diff from flexing now.... :facepalm:

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My brand new 'old' CV

Image
And showing how the diff was flexing

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'86 Eagle wagon limited
2150 carb
TFI coil
Omix valve cover
Alpine sound system

And the vacuum gauge reads zero


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