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Transmission problem 1992 GMC C3500


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yutakaone01
New User

Jun 9, 2011, 1:40 PM

Post #1 of 9 (3532 views)
  post locked   Transmission problem 1992 GMC C3500  

I bought my truck about 2 months ago. I live on the big Island Hawaii. I noticed that at low altitudes My truck would shift into all gears. I live in the mountains, and so I travel from high to low altitudes every day. Coming down from the mountain in the morning my truck would shift hard into 2nd gear and then shift to 3rd with no problem. Then it will not shift into 4th, 5th or over drive.
When I get down the mountain and park for a bit then start and drive again it would shift fine into all gears. Now it always shifts as mentioned before. It shifts into 1, hard into 2nd, nice shift into 3rd and will not shift into any higher gears. I do have reverse. What should I do? I would like to do some work on it myself. I know how to use a multimeter and wiring schematics, but the manual I have does not go into detail about transmission trouble shooting. My fluid level is fine and no burnt smell. Fluid looks old and has lost most of its red color.


(This post was edited by yutakaone01 on Jun 9, 2011, 1:43 PM)


speed
User

Jun 12, 2011, 7:27 PM

Post #2 of 9 (3508 views)
  post locked   Re: Transmission problem 1992 GMC C3500  

so is the fluid a black color then? also need to know miles on vehicle, engine size, etc.





GM ASEP 26 SCC Milford ASE certified in Brakes and Electrical on Thursday April 5th 2012


yutakaone01
New User

Jun 13, 2011, 11:57 AM

Post #3 of 9 (3500 views)
  post locked   Re: Transmission problem 1992 GMC C3500  

1992 year and it has 265,859 miles. fluid is not black, but it is not deep red either. it is like redish brown. I bought it from a local auto shop. the owner of the shop put a used trans in it. 6.2 L diesel 2 wheel drive. 1 ton


(This post was edited by yutakaone01 on Jun 13, 2011, 11:58 AM)


speed
User

Jun 13, 2011, 6:56 PM

Post #4 of 9 (3491 views)
  post locked   Re: Transmission problem 1992 GMC C3500  

first suggestion is changing the tranny fluid.





GM ASEP 26 SCC Milford ASE certified in Brakes and Electrical on Thursday April 5th 2012


yutakaone01
New User

Jun 13, 2011, 7:09 PM

Post #5 of 9 (3488 views)
  post locked   Re: Transmission problem 1992 GMC C3500  

just change fluid, but I should not flush trans?


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jun 13, 2011, 7:50 PM

Post #6 of 9 (3485 views)
  post locked   Re: Transmission problem 1992 GMC C3500  

With that kind of mileage, i wouldn't touch the fluid. You could make it a lot worse doing that.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



jn hog
New User

Apr 24, 2015, 11:56 AM

Post #7 of 9 (1493 views)
  post locked   Re: Transmission problem 1992 GMC C3500  

I would drop the pan and see if theres any pieces parts in it or the filter, if the fluid is discolored it has got hot, best case would be to service the trans, but not flush it, you may spend more monry flushing it just to find out it's smoked.

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Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Apr 24, 2015, 1:03 PM

Post #8 of 9 (1486 views)
  post locked   Re: Transmission problem 1992 GMC C3500  

No, that would be just as bad. The issue is the new fluid full of detergent that will wash away the sludge that is helping seal the servos right now.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Double J
Veteran / Moderator
Double J profile image

Apr 24, 2015, 10:47 PM

Post #9 of 9 (1476 views)
  post locked   Re: Transmission problem 1992 GMC C3500  

Thread is 4 years old Hoss
I'm sure its been handled by now, one way or the other.

Have fun and join in BUT we request you only reply to current threads.

Closed.........






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