AMC Eagle Den Forum
The Shop => 4X4 and Driveline => Topic started by: acfortier on September 23, 2022, 07:43:24 AM
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Hey all, working on currently swapping out my slipping auto transmission in my '86, and was turning the TC, and it doesn't sound... great. I'm thinking it's a stretched chain--may just end up replacing it with another NP128/129 locally from a JY for $150.
Is my diagnosis correct?
https://drive.google.com/file/d/1Iy_F09f7BiygBVnW8j3VALKA5UOqcGfF/view?usp=sharing
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Sure that's not a NP129? I see a shift lever there. Try moving the shift lever fully one way or another, it could definitely make that noise if it's partially engaged.
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It's an NP128, came out of the '86 I have. Yeah, the lever was fully engaged. I actually just picked up another NP128 that sounds a lot better, so I do think it was a stretched chain.
But, this new NP128, no matter where the lever is (forward or back), the front and rear yokes spin...
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I was thinking of a 119, sorry. :)
Sometimes synchros can be a little sticky, but the torque of the engine helps release them. Put it in 2WD, hold the rear yoke fast, and try to turn the front yoke one way or another. If you want lots of leverage, put the straps on the yokes and use bars. It should release itself without too much effort. It's all mechanical, so if it truly is stuck, it would have to be a bad shift fork or synchro...
Edit: also maybe turning the rear yoke while moving the lever around could help it go.
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Ah, yeah--I guess this one is technically acting like a 119 anyways ;D
That's what I was thinking, too. Even if it's a bad shift fork, and it is stuck in 4WD, I'm not that concerned. Thanks!