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87 GMC 1500 Coming out of 4 High when Plowing

Discussion in 'Chevy Trucks' started by detailman, Feb 14, 2007.

  1. detailman

    detailman Junior Member
    from Va
    Messages: 14

    I just bought an 87 GMC 1500 when I am plowing it keeps coming out of 4 high grinds and whines have to stop and do it all over again will work again for a few minutes then it will do it again works fine in 4 low. Plowed for 8 hours straight first trip out started on the way home. Just replaced the hubs didnt fix it but glad to have manual ones anyway. Any ideas would be great. Not trying to spend a bunch of money for an easy fix if possible. Thanks for any help.
     
  2. Mudman78

    Mudman78 Senior Member
    from NJ
    Messages: 103

    The shift fork inside the transfer case has nylon bushings on the ends of the fork. Over time they wear out and fall off. The excess play causes the t-case to pop out of gear. My 87 Suburban used to drop itself into 4 low while driving down the highway :eek: . Wasn't very fun.
     
  3. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    Yea, nylon the shift fork pads can be a problem on a 208 but it might just need the shifter adjusted. The linkage has a threaded adjuster on it so it might be an easy fix.
     
  4. detailman

    detailman Junior Member
    from Va
    Messages: 14

    appreciate the info.
     
  5. THE05HD

    THE05HD Member
    from WI
    Messages: 74

    IF IT HAS AUTO HUBS ....... THAT COULD BE THE PROBLEM ALSO ?

    GOOD LUCK
     
  6. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    If you read his first post he already replaced the problematic auto hubs with manual one's. A defective hub wouldn't cause it to stay in 4lo but pop out of 4hi anyway but switching to manual hubs is a good upgrade on any truck regardless, so it was still money well spent.