A343F reverse noise

Discussion in '80-Series Tech' started by Brian894X4, Oct 15, 2007.

  1. Beowulf

    Beowulf

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    Kyon,
    Good question. AFAIK, there have been no significant number of reports of any transmission damage or failures on the 80-Series A343F trannies; '97, '96, or '95. We don't know how many had the repairs in those TSBs done under the original vehicle warranty.

    I have a '97 and I have had (2 occasions) the noise in reverse. Stop, pull it out of reverse, back into reverse, and all is well. Kinda scary though.

    As for the poster saying he puts the transfer case in N to "fix" the problem... well, that has nothing to do with it. The issue is in the transmission, not the transfer.

    -B-
     
  2. landtank

    landtank SILVER Star

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    For me it became more and more of a problem as I added more weight to the truck and asked it to do more off road. It was happening more often and more severely as time passed. I'm not one to wait for a complete failure so I got on it as soon as time and funds allowed. I think the ODO was in the 175k range when the tranny was swapped out.
     
  3. Bear80

    Bear80

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    I took a look again and cannot find a TSB for the added check ball, at least not in the list here on 'mud. I would like to see what it entails and the part number for the check ball, even though I have no noise shifting out of reverse.

    Looking again at the serial #s I guess mine only needs the new o-rings but that is way not worth the work I think. If there is a TSB for shifting out of reverse noise and it's only a check ball that can be installed by pulling the pan and valve body I might try it.
     
  4. Beowulf

    Beowulf

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    Here is the TSB for the reverse to P/N "chatter". This is the "missing balls" TSB that C-Dan likes to gloat about.

    -B-
    TSB-1.jpg TSB-2.jpg
     
  5. Bear80

    Bear80

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    So it looks like only Aug-Oct '97 build dates and anything prior doesn't need it. Guess I've been incorrect all along about mine, it doesn't need any of them.
     
  6. jerseyfzj80

    jerseyfzj80

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    brian894x4 and landtank,
    I replaced my trans a 97 with one from a 96, (this after loosing all drive in my 97 trans well my new to me 96 trans has the the reverse shudder, I changed the trans fluid out for a fluid that allison uses in there trannies, this changeover has minimized the noise and lack of drive substantially contact me and I can give some info on the fluid.

    Colin
     
  7. Beowulf

    Beowulf

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    Colin,

    If you have a solution then post it.
    -B-
     
  8. Squash

    Squash SILVER Star

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    I have a parts list...
    Send me your e-mail addy and I will forward these numbers and hopefully the pictures will follow.


    B3 Brake return spring assembly and low coast modulator compression spring.
    A340E 96JR-25596
    A340F 96JR-46671
    A343F 96JE-06161

    "O"-Rings
    A340E 97AR-27196
    A340F 97AR-27976
    A343F 97AE-07106

    Old part # New Part # Part Name
    35068-30011 35068-50010 Spring sub ass,1st&reverse brake return
    90501-08088 90501-08169 Spring Compression for low cast modulator valve
    90301-99193 90301-99084 O-ring for outer brake piston
    90301-57188 90301-56007 O-ring for inner brake piston
    90301-68191 90301-67005 O-ring for inner brake reactive sleeve

    Looks like VIN # 04351-60090

    Tacomas & 4-Runners are included as well

    Thanks to Mr T for giving me the A442 bus tranny...
     
  9. lenross1

    lenross1

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    having the same issue with my tranny. i first noticed something was up when i was on incline in Drive and i would roll back. the same thing in Reverse as well (roll forward). i don't know if this is related or not. is it? i just changed my tranny fluid and notice the noise for the first time when i was in reverse and trying to climb. i put in low and had no problem but this was well after the 5 second L8shift was talking about.
     
  10. Jon Bartlett

    Jon Bartlett

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    Len, or others, what has been done to correct the problem? I have a 96 LX450 having difficulty going up grade in reverse. 4L works fine. Thanks,
    Jon
     
  11. lenross1

    lenross1

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    I just wait till reverse engages and it doesn't make the noise.. Not real helpful but it is what i do.
     
  12. Jon Bartlett

    Jon Bartlett

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    Thanks Len, Yours sounds a bit worse than mine. I have 141,XXX on the odometer and will keep tis thread informed if the issue persists, or grows. for now, I'll just use 4L when going up a grade in reverse. Thanks,
    Jon
     
  13. iptman

    iptman

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    Bumping this old thread. My serial number is 97DE07079 so outside of the 3 TSBs noted here. Has anyone else had this behavior and not been within the scope of the TSBs?
     
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