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  • December 05, 2022, 07:28:40 PM

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Author Topic: NP128 stretched chain?  (Read 462 times)

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Offline acfortier

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NP128 stretched chain?
« on: September 23, 2022, 07:43:24 AM »
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

Offline Illeagle1984

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Re: NP128 stretched chain?
« Reply #1 on: September 26, 2022, 08:02:31 AM »
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.
It's getting crowded down here:
1973 Ford Mustang "Rustang"
1984 AMC Eagle Sedan "IllEagle" 183k
1984 AMC Eagle Wagon "Eagle 2"
1996 Cadillac Eldorado 178k
1998 Oldsmobile Eighty-Eight 239k
2002 Cadillac Eldorado Doral Edition
2005 Chevrolet Silverado 1500 179k

Offline acfortier

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Re: NP128 stretched chain?
« Reply #2 on: September 28, 2022, 03:52:18 PM »
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...

Offline Illeagle1984

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Re: NP128 stretched chain?
« Reply #3 on: September 28, 2022, 06:24:58 PM »
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.
« Last Edit: September 28, 2022, 06:28:21 PM by Illeagle1984 »
It's getting crowded down here:
1973 Ford Mustang "Rustang"
1984 AMC Eagle Sedan "IllEagle" 183k
1984 AMC Eagle Wagon "Eagle 2"
1996 Cadillac Eldorado 178k
1998 Oldsmobile Eighty-Eight 239k
2002 Cadillac Eldorado Doral Edition
2005 Chevrolet Silverado 1500 179k

Offline acfortier

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Re: NP128 stretched chain?
« Reply #4 on: September 28, 2022, 07:48:20 PM »
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!

 

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