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New Front Crank. Seal Timing Chain

Discussion in 'Early CJ5 and CJ6 Tech' started by Speedybon, Aug 7, 2021.

  1. Aug 7, 2021
    Speedybon

    Speedybon Speedybon & Daisy

    Arroyo Grande...
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    Aug 2, 2021
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    So all the parts are clean and ready to install just waiting for the Gears Chain Tensioner Gude. So with that new front seal doing away with the rope seal that wants you to remove the housing that the front rope was in. With a better paint job. It's going to look better than it did I just hope it's quiet. Another thing what the deal with the new shift boot I got the holes did not align I made work where did I go wrong. It's a T90? in a 1968 CJ5 right.
     
  2. Aug 7, 2021
    FinoCJ

    FinoCJ 1970 CJ5 Staff Member

    Bozeman, MT
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    1968 with v6 would be T14 if OEM, if 4cyl then T90....the boot is slightly different between the two IIRC.
     
  3. Aug 7, 2021
    Speedybon

    Speedybon Speedybon & Daisy

    Arroyo Grande...
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    Aug 2, 2021
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    Thank you I am learning something every day. what is the difference is one better than the other. Also, I think I have 3.73s because this jeep seems really have tall gears. I working on the top and when it's done I start on the bottom. I will be more knowledgeable about the drive train then. Thanks for the information. Thank you for taking the time for the information.
     
  4. Aug 7, 2021
    Fireball

    Fireball Well-Known Member 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Pullman, WA
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    3.73 gears would be the most common for a factory V6. 4.88 was optional but not that common. With the 3.73s and a 3-spd the factory crawl ration isn't great for real offroading. That's why I'm getting a T18 truck 4spd ready to put in my 71.
     
  5. Aug 8, 2021
    FinoCJ

    FinoCJ 1970 CJ5 Staff Member

    Bozeman, MT
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    Both T90 and T14 are 3 speed with similar ratios....the T14 is synchronized in all three forward gears, whereas the T90 is not synchronized in 1st gear which can be a little annoying. They are probably about the same in terms of strength. Maybe the most important difference will be the D18 transfer case mating. T14 only mated to the large case single stick D18 and used 10spline output vs the T90 mated to the small case D18 with more common 6spine. Good info here:
    Novak Conversions :: Manual
     
  6. Aug 8, 2021
    Keys5a

    Keys5a Sponsor

    Florida Keys
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    Jan 23, 2014
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    4,191
    I use NOS surplus shift boots from the M38a-1 military jeeps. They fit the top of the shift tower and are very effective at keeping water out of the transmission, and they last nearly forever. I don't worry about sealing a boot to the floor plates.
    -Donny
     
  7. Aug 8, 2021
    duffer

    duffer Rodent Power

    Bozeman, MT
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    Sep 17, 2009
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    The way Jeeps were titled, one can not rule out a T86AA transmission in a 68 with the 225. I believe the T14 is stronger than the T90 and way stronger than the T86AA.
     
    FinoCJ likes this.
  8. Aug 8, 2021
    FinoCJ

    FinoCJ 1970 CJ5 Staff Member

    Bozeman, MT
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    John is correct - T86 was also a 3 speed option behind the v6 for the first year of production. I am also a fan of the T14 over the T90 but seems to spark some debate at times....assuming the PO has a v6/T14 combo, it is solid for most all use except lacking granny gear. A t86 usually becomes a problem when rebuilding as no parts a available (complete T90 guts can be used in a T86 case I believe to keep it running). Probably be helpful when the OP can get us a bit more info on the transmission.
     
  9. Aug 8, 2021
    Speedybon

    Speedybon Speedybon & Daisy

    Arroyo Grande...
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    Aug 2, 2021
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    That's funny because in your opinion do you think engaging the transfer case in 4 Low to drive around my 2 1/2 acres with the front hubs disengaged shouldn't hurt anything. It's funny that my 1968 V6 does not have a synchro first gear. so is it a T14 because the shifter boot everybody sells the holes did not align. I have the original owner manuals. I still concentrating on the top. I pust a Clutch in about eight years ago but then all I wanted was to get it back on the road
     
  10. Aug 8, 2021
    FinoCJ

    FinoCJ 1970 CJ5 Staff Member

    Bozeman, MT
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    It probably doesn't matter....but I'd just leave the hubs engaged all the time like the drive flanges were on earlier models and then shift the transfer case however you want.
     
  11. Aug 8, 2021
    duffer

    duffer Rodent Power

    Bozeman, MT
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    The T86AA is not syncro'ed in first gear. The short manufacturing life of the T86AA (1966-67) was due to it's equally short functioning life and warranty replacements. It does shift better than a T90. As James pointed out, service parts are largely nonexistent but you can use the case and replace ALL the guts with T90 parts. There should be quite a few threads on that topic if you do a search.

    And yes, you can run all day in 4 low with the front hubs disengaged.
     
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  12. Aug 9, 2021
    Speedybon

    Speedybon Speedybon & Daisy

    Arroyo Grande...
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    So what would guys recommend for a transmission. The T86 is working fine, but it would be nice to have a synchro 1st year or four-speed and who sells them. It is just for the street and a little country driving. I will leave what is there until there is a problem. It sounds like the T86 is junk. What is your guy's opinion? Are you guys sure that when new 225 came with nylon cam gear? I know the cars had them because of noise, so they must have bought AMC engines as Car replacements. I think the chains go because most jeeps only have driven short distances.
     
  13. Aug 9, 2021
    duffer

    duffer Rodent Power

    Bozeman, MT
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    I would just use the T86AA until it self destructs. If it only sees light to moderate use, it may last as long as you want to keep the Jeep. My CJ 5 still has its original T86AA. And similar to yours, it is titled as a 69-when I bought it.
     
  14. Aug 9, 2021
    FinoCJ

    FinoCJ 1970 CJ5 Staff Member

    Bozeman, MT
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    Unless you are looking wheel your jeep hard, just drive it as is - it might last forever, it might not. If it does die, then you can swap in T90 parts into the existing case and bolt it all back up just as it is, but still no synchro first. T14 was also used behind the v6, so you could find one of those and I *think* its pretty much a direct bolt in swap? Gives you synchro 1st. 4 speeds swaps start to get complicated...do your research before jumping into that and for many, it's not really any more useful for a putt around weekend driver.
     
    Speedybon likes this.
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