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Binding problem with Trany and t-case. (T-90)

Discussion in 'Flat Fender Tech' started by strayduck230, Mar 7, 2012.

  1. Mar 7, 2012
    strayduck230

    strayduck230 New Member

    Tumwater, WA
    Joined:
    Mar 4, 2010
    Messages:
    21
    Hey all,
    I have another T-90 trany that I am putting with my same t-case I have had for quite some time (dana 18 ).

    The issue: Both fit nicely together, as they should... but when I tighten the lower left bolt on the back of the t-case to the transmission (looking at it from the rear), I can not turn the input shaft... it locks it up. I tightened all the bolts evenly, but this one is a bit touchy and locks everything up. :cry: I loosen it up and things turn.

    Any help is appreciated. Thanks!
     
  2. Mar 7, 2012
    Mike S

    Mike S Sponsor

    Cameron Park Ca.
    Joined:
    Oct 6, 2009
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    811
    Is it possible that the bolt is too long, and hitting a gear inside the tranny?
     
  3. Mar 7, 2012
    strayduck230

    strayduck230 New Member

    Tumwater, WA
    Joined:
    Mar 4, 2010
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    21
    I tried putting washers behind the bolt but it didn't seem to make a difference, I could try a couple more, But they are the same bolts I pulled out. And it worked fine before.
     
  4. Mar 7, 2012
    BC3Jeep

    BC3Jeep Electric Bill

    NW Illinois
    Joined:
    Oct 8, 2009
    Messages:
    47
    Is it possible that there is a distortion on the face of the new Tranny that is causing a bind at the very end of torquing??? Is it just one bolt that causes the issue or is it the final tightening of all???
     
  5. Mar 7, 2012
    nickmil

    nickmil In mothballs.

    Happy Valley, OR
    Joined:
    Sep 23, 2002
    Messages:
    12,529
    Was the transmission rebuilt? Is it possible someone put the reverse idler gear in backwards and the bolt is hitting that? The gear is recessed iirc but I'd have to look at one to be sure.
    Try tightening up all the other bolts carefully and see if it only that bolt.


    Sent from my iPhone using Tapatalk
     
  6. Mar 7, 2012
    Howard Eisenhauer

    Howard Eisenhauer Administrator Staff Member

    Tantallon, Nova...
    Joined:
    Nov 22, 2003
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    8,102
    Shouldn't make a difference- I ran mine in backwards for years after chipping a tooth on it.

    H.
     
  7. Mar 7, 2012
    oldtime

    oldtime oldtime

    St. Charles,...
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    Aug 14, 2006
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    3,466
    Binding is a common occurance if the countershaft / reverse idler shaft lock plate is not correct.
    The correct plate is inserted from the top side and does not extend below either of the the two shafts.
    The lock plate must fit completely into the transfer case casting recess intended for that purpose.
     
  8. Mar 7, 2012
    strayduck230

    strayduck230 New Member

    Tumwater, WA
    Joined:
    Mar 4, 2010
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    21
    The only thing that was changed in the transmission was that I put a longer shaft in it for the Buick V6 conversion. I am back to thinking that it is something to do with that bolt specifically... like it is to long for example. It seems to be that one that makes the difference. I'll try the simple thing first!
     
  9. Mar 7, 2012
    jeep2003

    jeep2003 Well-Known Member

    Upstate NY
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    May 30, 2006
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    poke something in there to see how deep it goes
     
  10. Mar 7, 2012
    strayduck230

    strayduck230 New Member

    Tumwater, WA
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    Mar 4, 2010
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    That is what I have researched. That is what I will be checking next! Thanks.
     
  11. Mar 7, 2012
    Warloch

    Warloch Did you say Flattie??? Staff Member

    Falcon, CO
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    Mar 4, 2003
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    I have fixed 3 or 4 for folks with this exact issue over the years.
     
  12. Mar 8, 2012
    strayduck230

    strayduck230 New Member

    Tumwater, WA
    Joined:
    Mar 4, 2010
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    21
    it seems that this problem is fixed. In the guide here: http://www.willystech.com/wt/T90RebuildGuide/T90rebuild.htm
    It mentions 2 different length bolts, "there are 2 different size bolts to hold the T-case to the transmission, 1" & 1 1/8". They warn that improper assembly can lead to gear damage and leaks. They want the two 1" bolts in the lower left and lower right."

    Now, my next issue with this little project, sometimes I can shift through the gears fine with no major hang-ups, and then it will literally be "stuck" in 2nd gear, doesn't matter if I am stopped, shut off, or anything. It acts stuck. mehh When I get it out, (some how) it will barely go into 3rd. Almost like it is "getting lost" in between 2nd and 3rd gears. Not much grinding to speak of, just not going. Down the road it will work fine for awhile, then repeat itself again... :?
    I am hoping this could be related to the shift tower, I have never done anything to it. It has gotten a bit worse over the past week or so.

    I tried to explain this as clearly as possible. Oh the joys of the hobby. :rofl:
     
    Last edited: Mar 8, 2012
  13. Mar 8, 2012
    strayduck230

    strayduck230 New Member

    Tumwater, WA
    Joined:
    Mar 4, 2010
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    I have been reading a lot about synchros. But it would grind a lot more if that was the case? Anyway, I will need to get back into it when I get back in a few days. As always, suggestions and help is much appreciated!
     
  14. Mar 8, 2012
    Mike S

    Mike S Sponsor

    Cameron Park Ca.
    Joined:
    Oct 6, 2009
    Messages:
    811
    I dont know if this will apply to your tranny or not, but the symptom sure reminds me of a problem I had many years ago with a 4 speed in my old 64 Chevelle.

    There are 3 little spring loaded tabs that keep the syncro slider in place, and one of mine had gotten damaged, and would jump out of position. These are inset into the main shaft, work on the inner surface of the slider.

    If your tranny has something similar to these tabs, it might be your problem.

    Nick---where are you when we need ya buddy???

    These are what I am talking about.

    [​IMG]
     
    Last edited: Mar 8, 2012
  15. Mar 8, 2012
    strayduck230

    strayduck230 New Member

    Tumwater, WA
    Joined:
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    ^^^^ That is very similar. I will have to take a look at that when I open it up again.
     
  16. Mar 8, 2012
    strayduck230

    strayduck230 New Member

    Tumwater, WA
    Joined:
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    Just went for a drive in the jeep for a test run before I hit the road for the weekend. For fun, I tightened my clutch cable, (it was really loose) to see if that had an effect. Not really. haha

    But, it only got hung up in 2nd one time when I first started driving. Then a bit later (one time) it was a bit slow going into 3rd. Then it was shifting pretty normal like an old t-90. As stated above, I think it has something to do with the spring loaded tabs on the main shaft. It is like sometimes when I shift to 2nd, it "goes to far", thus getting out and going to third is really hard.

    Sorry, I am thinking while typing. Will know more after the weekend.
     
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