Quote:
Originally Posted by Crazygirl
All three said it was either the converter or front transmission pump. Either way, I'm looking at at least $1000 worth of further repairs...
I'm inclined to believe them, even if they've never driven it, because they rebuild all of their own transmissions, and would have no reason to lie to me.
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Just one opinion, but I would be inclined to dismiss the neighbor's diagnosis.
I rebuild my transmissions as well (including transverse). First, a converter problem would likely exhibit a lot of other symptoms. Those include noise, high temperature, slipping while IN ranges, metal pieces in the pan, and others.
Second, a "front pump" is a bit redundant, and may provide some hints about their level of knowledge of the 4L60/65. There is only one pump. If they believe there is a rear pump they probably haven't opened a transmission since the 1960s. Further, pump failures most commonly result in lower line pressure or foamy (air-entrained) oil, not higher line pressures. The symptoms of a harsh shift would not occur with lower pressure, but slippage and slow/long shifts would be apparent.
I'll stick with the original suggestion that the pressure control/valving would be the most common problem. Max defined that even further., but since changing the PCS also involved dropping the pan and changing the fluid/filter, there is a possibility that the valve spools are varnished/sludged and not otherwise damaged. In this case, running the fluid and changing it again after it has had an opportunity to clean things up could potentially help the condition.
There is also an equal chance that the valve body has the common wear, and reaming/sleeving it will solve the problem. If you DO decide to repair or replace the valve body with a remanufactured unit, be sure to replace the separator plate at the same time since its integral check ball seats do tend to take a beating over time and could contribute to shifting problems.
As Max indicated, driving it for a while with the harsh shifts should not be a substantial problem (20K miles), and may allow the clean oil to free up some sticky spools.
Incidentally, the transmission WAS refilled with Dexron 6 fluid, right? Dexron 3 is no longer permissible in these units.