I'm in process of rebuilding a 5HP24 to repair a defective A drum. The tranny has been on the bench for a couple of weeks now and the new parts arrived yesterday, so re-assembly starts over the next few days.
While reading up on the job, I've found a few posts which reference the torque converter and vibration issues which has me wondering if mine has a problem as well. I've had an annoying vibration for several years now that I've never been able to identify and have done all the usual things to try to remedy (balancing, new tires, replaced wheel bearings, bushings, etc but while some changes seem to improve things, have never had it go away.
The vibration comes on between 50 and 55 mph and often smooths out as speed gets to 70+ mph. Occasionally it is apparent at lower speeds, usually 30-35 mph. Travelling the same road (I live on Vancouver Island so we really only have 1 highway) the severity can vary day to day - some days worse than others, but never more than an annoyance, so road surface doesn't seem to be a contributing factor. Since starting around 2002, it progressed slowly for a few months, but hasn't gotten any worse for the last several years.
Until the A drum failed a few weeks back, I've had no symptoms from the tranny that caused concern beyond the occasional abrupt downshift or delay in upshifting from 2->3. However, where I live is hilly, so most of this I've attributed to the effect of the slope. There is no vibration or noise from the transmission at any speed & I have replaced fluid (using the part fill method) twice over the past 6 years using Esso fluid &, both times found nothing wrong with the fluid coming out or any shavings / debris on the magnets.
In a roundabout way, this brings me to my question - reading this info, especially a table in another posting showing that full lockup occurs by 57mph, about where my vibration really becomes apparent, makes me wonder if I have a problem with the torque converter (perhaps a bad lockup clutch), or something in the valve body that is inhibiting lock up. However, as I've had no other symptoms & it seems to have stabilized at the current state, rather than continue to deteriorate which I would have thought was a more normal failure pattern, I'm not in a rush to throw another $600+ at it on spec (which is what it seems a TC and valve body delivered would cost me).
Appreciate any input or thoughts that I can use to help finalise my decision and plans for re-assembly
Scott
08-04-2012, 08:25 PM
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