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T90 Rebuild Questions

Discussion in 'Early CJ5 and CJ6 Tech' started by Dgroshek, Jan 26, 2018.

  1. Dgroshek

    Dgroshek Member

    Rebuilding my T90a and have 2 questions. I bought the master rebuild kit from novak-adapt.

    1. My gear cluster does not have notches for the thrust washer I'm supposed to put between the gear cluster and the other thrust washer on the transmission body. What do I need here?

    2. I had a very tough time getting my inner synchro into the outer shaft with the panels in. Had to really use some force. The inner synchro goes forward and backward with two thumbs pushing relatively hard and both forward and bacl the inner shaft only sticks out about 1/8 of an inch and I cannot move it any further. To move it more, I'd have to take the springs out. Is this (with the springs in) how it should be?
     
  2. jeepstar

    jeepstar Well-Known Member 2024 Sponsor 2023 Sponsor 2022 Sponsor

    pics? I'd like to see the issues, and the end result/fix. have you contacted Novak? they have pretty darned good customer service. there are also quite a few rebuild videos on YouTube.
     
  3. Dgroshek

    Dgroshek Member

  4. Dgroshek

    Dgroshek Member

    Still working out my synchro. The customer service at Novak said to just grind down the teeth on the rear cluster gear thrust washer so it's flat.
     
  5. Howard Eisenhauer

    Howard Eisenhauer Administrator Staff Member

    Rick Stivers' T90 rebuild videos are now on youtube- there's a lot more in them than the document has- he does talk about reasons for what you're describing.
     
  6. Dgroshek

    Dgroshek Member

    Thanks, Howard. Those videos are pretty good. I built my synchro the same way he did in his video, except I didn't look for where the pawls were originally. I'll be trying this tonight. Hopefully that's it. Strange that that would cause it to bind as much as it is though
     
  7. Howard Eisenhauer

    Howard Eisenhauer Administrator Staff Member

    Check the springs as he suggests.
     
  8. Dgroshek

    Dgroshek Member

    Over the weekend I figured it out. The springs weren't the issue. I re-used the old pawls that were in good condition. No more binding.
     
  9. jeepstar

    jeepstar Well-Known Member 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Thanks for the followup
     
  10. skratch

    skratch Banned

    I had the similar problem when I rebuilt my T90, the rebuild parts from the Novack kit that included the syncro springs which were the flat type and were far to strong
    for the syncro tabs, enough that it locked up the syncro tabs. I finally put the wire type springs back in and no more problems.
     
  11. Jonbbrew

    Jonbbrew Member

    any first timers please speak up. Is it worth the fun vs hassle instead of paying someone $300 labor to rebuild a T90 with Novak parts?
     
  12. chris423

    chris423 Sponsor

    i did it and proved my son wrong . I can rebuild a transmission .LOL
     
  13. jeepstar

    jeepstar Well-Known Member 2024 Sponsor 2023 Sponsor 2022 Sponsor

    If you have the money, its always easier to pay someone to get the headaches for you.
     
    Last edited: Feb 21, 2018
  14. Dgroshek

    Dgroshek Member

    Do it yourself. Watch the video while rebuilding. Worst part is the needle bearings but if you cut conduit and a 3/4" steel bar its not too bad.
     
  15. aekdbbop

    aekdbbop Member

    I did mine for the first time just last year, have done a friend's since. Totally worth it to do it yourself. I thought it was fun :)
     
  16. Glenn

    Glenn Kinda grumpy old man Staff Member

    Time, patience and tools are the keys. If any of those are lacking it might be best to pay to have it done.
     
  17. TIm E

    TIm E Aggressively average

    My first transmission rebuild was my T-14 (68 CJ5). $300 seems like the right price for the amount of work involved, but it wasn't the cost so much for me as it was wanting to do it...to learn it. Watch a few videos, follow the FSM and you should be fine. I found it very rewarding.

    My old school machine shop guy happened to stop by and saw the freshly rebuilt unit sitting on the workbench, he went to inspecting, checking and measuring (likely hoping to teach me something knowing it was my first). Eventually he said, "Man, everything on this is spot on!" I said, "That's right."

    I was just being funny, but it was nice to have confirmation that following the instructions and taking your time can result in a good quality first time rebuild.
     
    Jrobz23 and Glenn like this.
  18. nickmil

    nickmil In mothballs.

    Customer brings in transmission. Tear down for no charge, clean, inspect. (About 1 1/2-2 hours invested at no charge). Give customer list of parts needed. Customer brings in a core transmission. Tear down, clean, inspect. Give customer list of parts still needed because core he/she brought in is a worn out piece of junk. Customer pissed because they were charged for teardown, cleaning, and inspection of transmission they brought in for parts. Would have been cheaper if they had just gone with original parts quote.
    I've had customers bring in 4 junk transmissions they expected torn down, cleaned, and inspected for free when clearly informed there would be a charge after the first one. Anyone wonder why I retired from this business?