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TH 350 rattle

Discussion in 'The Hokey Ass Message Board' started by Rev. Whitewall, Jul 6, 2010.

  1. Rev. Whitewall
    Joined: Jun 8, 2010
    Posts: 39

    Rev. Whitewall

    Well I've done a search here and found little on topic. Admittedly, I'm not a tranny guy. Here's my head scratcher...

    -slight rattle 1st and 2nd gear
    -rattle increases a little in 3rd
    -after you really get into it at highway speed, rattle gets pretty bad
    -shifts fine, no slipping
    -if I slip it into N while driving, rattle stops
    -i drove with the floorboard hump off and with a stethoscope found the noise to be coming mainly from the passenger side of center- close to the bell housing (not on the bell housing)

    I wouldn't think this would be a vacuum issue since it shifts fine. My best guess is some type of worn gearing. I've never torn apart a TH 350. I'm just seeking some direction before I yank this thing out and dive into it.

    Any tranny guys have any ideas? Thanks in advance.
  2. F&J
    Joined: Apr 5, 2007
    Posts: 13,223


    maybe loose torque converter bolts or cracks in the flexplate.
  3. carcrazyjohn
    Joined: Apr 16, 2008
    Posts: 4,844

    from trevose pa

    Where is your timing set at .Just another possibility .
  4. Rev. Whitewall
    Joined: Jun 8, 2010
    Posts: 39

    Rev. Whitewall

    bump for the morning crew.

    Thanks fellas

  5. Ratfink749
    Joined: Nov 16, 2008
    Posts: 89


    This would be the first place I'd look. The only other thing I can think of in a 350 that might rattle would be the one way roller clutch housing that is usually held back by the "case saver" clip. It resides about mid-way down the transmission. To me it would just "clunk" rather than rattle though. (If said clip was broken or missing)
  6. onlychevrolets
    Joined: Jan 23, 2006
    Posts: 2,307


    Thats where I'd start looking, I've built a few hundred 350's but never because they had a rattle...check the converter bolts.
  7. davey_shumard
    Joined: Jun 28, 2010
    Posts: 151


    Had a 71 C10 that had a strange rattle much like the one you are talking about, it ended up being a cracked flexplate.
  8. Rev. Whitewall
    Joined: Jun 8, 2010
    Posts: 39

    Rev. Whitewall

    Thanks fellas. I'll check it out this evening.
  9. sawzall
    Joined: Jul 15, 2002
    Posts: 4,728


    I had a similar issue and know it wasnt loose or cracked parts

    likely something inside
  10. bobkatrods
    Joined: Sep 22, 2008
    Posts: 685

    from aledo tx

    Being it goes away in neutral i am going with, loose torque converter or cracked flexplate around mount holes
  11. Imwalkin
    Joined: Jul 29, 2004
    Posts: 539

    from Tucson, Az

    I had a rattle in my chevy truck. It only did it when I was loading it (taking off from a light, passing or pulling a hill). Ended up being the U joints. Not what I expected.
  12. wildearp
    Joined: Oct 24, 2007
    Posts: 522

    from tucson, az

    I had a shift shaft touching the exhaust that caused some wierd noises. Trans guys said it was the rear end. Rear end guys said it was the trans.

    I should have just got under there and looked for myself...........
  13. Rev. Whitewall
    Joined: Jun 8, 2010
    Posts: 39

    Rev. Whitewall

    Well, I checked the flywheel and torque converter. Tight and no cracks. Now, its rattling the same in N as well. What would be spinning and causing a rattle while in gear AND N, but NOT in park or while in gear at a stop?

    I have the opportunity to put in a 700r4. It's gonna take a little minor fab at the mount and a shorter driveshaft, but all very doable. I guess I'll need to figure out how to bypass the electronics, if it's even possible.

    Aggrevation is setting in.:confused:

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