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Re: [GMCnet] Sudden Transmission Failure [message #310175 is a reply to message #310174] Thu, 10 November 2016 02:35 Go to previous messageGo to previous message
Bruce Hart is currently offline  Bruce Hart   United States
Messages: 1500
Registered: October 2011
Location: La Grange, Wyoming
Karma:
Senior Member
Here is the trouble shooting manual for the THM 425 transmission

http://www.bdub.net/manuals/THM_425_Trouble_Shooting.pdf

My transmission filter intake pipe had fallen out causing the symptoms you
described.



On Thu, Nov 10, 2016 at 12:49 AM, Ken Burton wrote:

> Well, the first thing to do is to determine if it is really the
> transmission failing.
>
> The first thing I would do is check the trans fluid level.
>
> The the second thing I would look at are the 6 bolts (per side) that hold
> the drive shafts to the final drive still there. Those things are heavier
> than grade 8 and if they are not torqued to 70 Pounds or so they will fall
> out leaving you stranded. I have been out on two different Black List call
> over the years that when I arrived I found all of the bolts on one side
> missing. So start it and put it in nay gear and go look underneath to see
> if
> one 1/2 of the axle shaft (on both sides) is turning and the other side is
> sitting still.
>
> The third thing I would look at is to see if the problem is in the shift
> linkage. Without the engine running and the wheels blocked so it will not
> roll, have someone shift the gear shift through various gears while you
> watch to see if the shift linkage is indeed moving the shift lever on the
> trans.
>
> If all three of the above are good, come back here and we will give you
> some more ideas.
> --
> Ken Burton - N9KB
> 76 Palm Beach
> Hebron, Indiana
>
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>



--
Bruce Hart
1976 Palm Beach
Milliken, Co
GMC=Got More Class
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Bruce Hart 1976 Palm Beach 1977 28' Kingsley La Grange, Wyoming

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