i have a 1993 crown vic with four wheel disc brakes, the problem iam having
i had the rear tires on jack stands to change u joints, when finished i put
it in gear to check my work and noticed the rear drivers tire was hanging
up. i took the tire off and noticed i had a wobble in my rotor, so i
changed the rotor,brakes, and caliper, to no avail. about 2 months ago i
had the spider gears replaced, iam stumped any advice? thank you.
thank you again. ihave another problem dont know if it is related. at about
45 mph i get a body shake for a few seconds it is not in steering wheel nor
is it from the front it feels more from the middle back. if i put it in
neutral it stops, or if i take my foot off gas it will stop. thought was
my u-joints so i changed them but that did not stop it.it dosent do it all
the time but seems to be getting worse. thank you for your help.
Sounds like torque convertor shudder.
Change the transmission fluid; drain the torque convertor, drop
the pan and replace the filter, refill with the correct fluid.
May take a few miles for the shudder to go away.
thank you for all your help. that was something we were considering doing
anyhow but didnt realize it could cause something like that. is it because
the dirty filter wont let the fluid through or what. please let me know why
you think it will make it do that. thank you again.
The torque converter shudder feels a lot like driving over rumble strips...
it doesn't happen on AOD transmissions but it does occur on 4R70W units.
The AOD has P,R,N,D,L and the 4R70W has P,R,N,D,2,1 and a button for
overdrive. I don't remember when they changed. If it is the newer one, use
Mercon V fluid per Ford service bulletin.
thank you it does have prnd21 with overdrive button on the end of the gesr
shifter. just curious whats makes it do that bad filter or bad fluid or
what and it does kind of feel like that rumble strip. thank you for your
That tranny uses a lock-up torque converter, the previous one did not. They
run a bit hot and the fluid expires in time. The shudder is caused by the
lock-up going on and off, kinda slipping - making the rumble strip effect.
Mine did it last winter after a "friend" got my car unstuck from a snow
drift. The new Mercon V fluid is semi-synthetic and is formulated
differently. Be sure to completely change the fluid by dropping the pan
(change the filter) and draining the torque converter. The last time I
checked, a Ford dealer will do the whole thing for a little over $100.
Regular fluid changes keep it at bay but some folks add a tranny oil cooler
I am glad to be helpful. There are a lot of helpful folks here. Most of
them know their stuff quite well. I am a shade-tree mechanic but I believe
in doing the job right. I have learned a lot just lurking and reading.
Just hang around and read after you get your problems fixed - it's a great
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