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700r4 'clunking' noise: question/opinions

Discussion in 'The Garage' started by la_blazer82, Apr 18, 2005.

  1. la_blazer82

    la_blazer82 1/2 ton status

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    I searched for prior posts and found lots of threads on the 700R, but didn't see anything in particular to my issue.

    Whenever I shift into Reverse or Drive, I get a 'clunking' noise, but the tranny seems to shift half decently. There doesn't seem to be any slipping in Drive, except that the shifts are not really smooth. I just bought and towed some new bikes (3 dirtbikes, 1 quad) over the weekend, and now whenever I shift into R or D, the clunking is much louder and I can hear some additional noise like gears engaging.

    I recently swapped axles, currently 3.73 on 14bff (am supposed to swap to 4.56 this week), and am running on 35s. New conversion u-joint for rear d-shaft to pinion. I did not change the t-case to shaft u-joint.

    Could this be a u-joint problem, or the tranny taking a dump? If tranny, is it better to rebuild, buy one from junk yard, or save up and get a Bowtie?
     
  2. randy88k5

    randy88k5 1/2 ton status

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    Im not the best in diagnosing auto tranny problems by any means, but I would check the basics first. I would make sure your throttle valve cable is adjusted properly. Make sure trans mounts are good. Make sure fluid looks/smells good and is topped off. Check driveline stuff like ujoints. Then start researching internals. I dont have my 700r4 book nearby, so I wouldnt even venture a guess as to internal problems. Hope someone else can help out more.

    Also when you tow, make sure your in D and not OD.
     
  3. 1979jimmy350

    1979jimmy350 1/2 ton status

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    check your u-joints they could be causing this
     
  4. mouse

    mouse 1/2 ton status

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    What transfer case are you running?
     
  5. la_blazer82

    la_blazer82 1/2 ton status

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    Thanks for the tips Randy!

    I'm running a 700r4/NP208 combo. I haven't engaged the t-case in at least five months due to the axle swap and the mismatched gears (4.56 up front/3.73 on 14bff - am swapping gears in the next weeks).

    I don't have any tranny fluid leaks, no smoking, very slight slipping but this is the original tranny (I think)
     
  6. vortec

    vortec 1/2 ton status

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    play in the rear end can also make a similar sound. on a fairly short wheelbase truck, it can be a bit tough to differentiate that from the trans. on my '94 pickup, i was getting a similar sound, a few years ago, but after greasing the slip yoke, it went away completely.
     
  7. 89GMCSuburban

    89GMCSuburban 1/2 ton status

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    I second either the slip yoke or backlash in new axle.
     
  8. la_blazer82

    la_blazer82 1/2 ton status

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    The problem is that this 'clunking' noise was occurring even before I swapped out the 10 bolt for the 14bff. It just seems to have gotten a bit more porfound recently.

    How do you check for backlash? I recently greased every zerk I could find under the Blazer. To grease the slip yoke, do you actually have to remove the d-shaft and grease the slip yoke, or through the grease zerk?
     

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