I have a '97 e150 conversion van. "Sometimes" the van vibrates on
acceleration. I assumed it was the tranny , but aamco checked it out and
said the tranny is fine but did not know the cause of vibration. The best
way I know how to describe it is --I get the same type of sound when going
over those "ridges?" as you slow up to a toll booth. I take my foot off the
peddle, then accelerate again and it's gone. Three mechanics so far have
been no help. I just know this will become a bigger problem with the family
in tow 500 miles from home:).
Any help would be greatly appreciated.
This is a common problem with the AOD-E transmission. The torque converter
couples the engine to the transmission has a clutch inside that locks the parts
together at ~40mph. This has the same effect as the clutch on a manual
After about 50k miles or more, it is common for the clutch to "shudder" when
This can often be corrected by flushing the transmission and using synthetic
let go, the converter clutch can fail along with the rest of the trans (in
cases). The first thing to do is service the trans, replacing ALL of the fluid.
see if the problem diminishes or goes away completely.
Your are probably right in your assessment of the problem
but, he should note that you call it an AOD-E transmission
and someone else may call it a 4R70W because it is in a
truck. It is the same animal with a different set of ratios
for the uninitiated. The diagnosis and correction remains
the same. He may get sticker shock when he sees the price
of the synthetic fluid but, it is still a bargain if it does
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