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Screwed Tranny ??

Discussion in 'Truck & Equipment Repair' started by B&E snowplowing, Dec 9, 2009.

  1. B&E snowplowing

    B&E snowplowing Senior Member
    Messages: 159

    Hey all I have a weird problem. Went out plowing this morning, then back to the office were I parked the truck, at 5pm I got in the truck to drive home and I have no 2nd, 3rd, or 4th gear. I have reverse, and 1st but nothing else. I tried shifting manually and still nothing. 4wd still works great. I'm stumped. It is a 1995 GMC 2500 with the 4L80E tranny. This Tranny was rebuilt last winter, and since the rebuild I have done about 16,000 km. Checked the fluid it was full and red, and didn't smell burnt, and I have no check engine lights come on.

    Weird thing is, that it was fine this morning, then after sitting for 8 hrs, its screwed.

    Thanks for your input
    Brian
     
  2. ChevKid03

    ChevKid03 Senior Member
    Messages: 505

    I'd be calling the guy who rebuilt and to find out what's up. Must of come with some sort of warranty.
     
  3. carl b

    carl b PlowSite.com Addict
    from Ohio
    Messages: 1,330

    I'd put money on its just a relay
     
  4. Wildman_fab

    Wildman_fab Junior Member
    Messages: 9

    Yea sounds like you might have gotten the plug on the oustide wet or it fell off. I would be calling the guy.
     
  5. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    Wet NSBU switch and/or connectors on it. not uncommon for them to lose their weather sealing abilities as they age.

    Get a fresh one on there and check the connectors for water intrusion. Dielectric grease and then a coat of Fluid Film over the entire switch/harness. :nod:
     
  6. farmer1009

    farmer1009 Junior Member
    Messages: 25

    I had the same problem with my 92 suburban last year, and it ended up being caused by moisture freezing and seperating a connection. Of course three months later the tranny blew out anyways, but made it through the winter.
     
  7. B&E snowplowing

    B&E snowplowing Senior Member
    Messages: 159

    OMG thank you very much for the input, I'm thinking it must be the connector, because I let the truck sit for 5 hours while I went christmas shopping with the wife, came back and took it for a drive and it is shifting fine, so looks like I am crawling under the truck in the morning.

    Again thanks for the quick replys.

    Have a great season.
    Brian
     
  8. welded wrenches

    welded wrenches Senior Member
    Messages: 177

    shifted took a shiptt

    more like the 1-2 boost valve in the tranny valve body.valve stuck in the bore..that is a 4L60E ...other coroded wire plug terminal..
     
  9. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    He specifically stated the trans is a 4L80E. Have to believe he's aware of which trans the truck is equipped with.
     
  10. B&E snowplowing

    B&E snowplowing Senior Member
    Messages: 159

    I am positive it's a 4L80E.