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B&B Urgent help needed, lost reverse in 05 2500HD

Discussion in 'Chevy Trucks' started by flykelley, Feb 22, 2010.

  1. flykelley

    flykelley 2000 Club Member
    Messages: 2,127

    Hi Guys
    was stacking snow and went it put it in reverse and nothing, trans fluid not burnt, temps never over 200 degrees. I have it in the garage right now thawing out, snow is packed around the skid plate and I would guess the trans also. Going to look for broken wires or a pin pulled out out of harness. I do have all the rest of the gears, any ideas or thoughts?????

    Thanks Mike
  2. cubicinches

    cubicinches PlowSite.com Addict
    Messages: 1,415

    Broken reverse band...
  3. Mark13

    Mark13 PlowSite Fanatic
    Messages: 5,796

    That would be my guess also.
  4. Dewey

    Dewey Senior Member
    Messages: 438

    been there done that.... Broken reverse band...
  5. GreenDuramax04

    GreenDuramax04 Junior Member
    Messages: 28

    It could also be the NSBS (Neutral safety backup switch). Its located on the side of the trans around the shift linkage. Its happend to me before. Sometime snow/water gets into the connector.
  6. naturalgreen

    naturalgreen Senior Member
    Messages: 404

    yep read on nsbs
  7. lilweeds

    lilweeds PlowSite.com Addict
    Messages: 1,178

    Is it an Ally or a 4L80?
  8. 2COR517

    2COR517 PlowSite Fanatic
    Messages: 7,115

  9. flykelley

    flykelley 2000 Club Member
    Messages: 2,127

    4L80, trans
  10. lilweeds

    lilweeds PlowSite.com Addict
    Messages: 1,178

    Then it's probably the band.
  11. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    Easy positive identification test since you still have all forward gears Mike. Do you have full compression braking if you hold it in manual 1st, run it up to around 20 MPH and quickly back out of the throttle? If there's little compression braking in manual 1st then the rear band is broke. Thus no reverse either.

    You know what comes next.
  12. millsaps118

    millsaps118 Senior Member
    Messages: 702

    B&B what causes the reverse band to go while in D? Op said he was stacking and shifted to R and had nothing.

    Just looking for some clarification.
  13. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    Nothing, because it doesn't break until you engage it. But they'll do it so quick and cleanly on the initial engagement that you never even feel it apply and then break. Kind of gives you that :confused: feeling when they do.
  14. millsaps118

    millsaps118 Senior Member
    Messages: 702

    So basically the R band can go at any time regardless if your plowing or not. I could hop in my truck tomorrow morning and throw it in R and nothing......? That sucks!!!!
  15. flykelley

    flykelley 2000 Club Member
    Messages: 2,127

    Hi B&B
    My ass is dragging been plowing for about 18 hours and now this. This is why I posted this question to you, wanted to see if there was a easy way to tell if it was in fact a rear band broken. If it is a rear band do you suggest just replacing it or are there some other mods that should be done at the same time.??? Also anybody have a good rebuilder that is quick?
    Ya I know I want everything, but we have more snow on the way and really need to get this truck back on the road.

    Thanks for all of your help, too tired to do this test tonight but will do it first thing in the morning and will report back.

    Good Night Mike
  16. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    100% correct, it can let go at any time and with no prior indication that it's about to.

    And some just die no matter how well you treat them but it's still important to keep reverse abuse to a minimum as much as possible until it's time for a rebuild. Then it can be upgraded to a good quality band...so you can pound it all you want then. Or until the next weakest link lets go. :D
  17. IMAGE

    IMAGE Sponsor
    Messages: 1,747

    Where to you suggest buying upgraded 4L80 internal parts at B&B?
  18. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    How much usage does it have on it Mike? If it's been taken care of there isn't much else that would need done beside upgrading the band. Many guys jump the gun after breaking the band and want to rebuild the entire unit, but unless it's been pounded or has a ton of miles on it the rest of the internals will usually still be in like new condition. I've torn many down that all the wear parts still looked like new and simply replaced the band and re-installed it and it lived a long life.
  19. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    I purchase most of my trans parts through a local supplier Steve so I can't give you an exact place to go on the web but I'm sure there's many of them out there. However, when you're looking around try to find a genuine "ALTO" brand kit as they produce some of the best rebuild kits and many distributors sell them. Or at least try to find someone else's branded kit that includes ALTO's clutches and steels. If you're not aware ALTO is one of the biggest supplier of trans parts out there and much of their stuff is manufactured in the good old USA. You'll be starting out with good quality components then.

    Note: most kits don't include the front or rear bands so they have to be purchased separately in many cases.

    NICHOLS LANDSCA PlowSite Veteran
    Messages: 4,362

    Happened to my brother, pushed into a pile and went to backup at first he thought he was stuck no such luck.:cry: