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Path: utzoo!watmath!clyde!burl!ulysses!mhuxr!mhuxt!houxm!whuxl!whuxlm!harpo!mls
From: mls@harpo.UUCP
Newsgroups: net.auto
Subject: 4 Speed Automatic 85 GM transmission
Message-ID: <2677@harpo.UUCP>
Date: Mon, 18-Mar-85 09:09:23 EST
Article-I.D.: harpo.2677
Posted: Mon Mar 18 09:09:23 1985
Date-Received: Tue, 19-Mar-85 06:03:00 EST
Sender: mls@harpo.UUCP
Organization: AT&T Bell Laboratories, Whippany
Lines: 23
Nf-ID: #N::72500007:000:1062
Nf-From: !mls    Mar 18 09:09:00 1985

I have an 85 Buick Park Lane that I bought April 84.  During the
summer it developed a vibration problem at 45 in speed3 and around 55
in speed 4.  The vibration started if I applied a slight amount
of throttle on a small grade the front end would vibrate.  If I pushed
further the vibration stopped.  I assume at that point the lockup on the
torque converter was removed.

Lat fall the dealer fixed the problem.  The gas mileage decreased
and the shifting between 3 and 4 gears was extremely smooth.  I determine
that the way the dealer fixed the vibration problem as not to allow
the torque converter to lockup.  I am presently returning the car to the
dealer.

Has anybody had any similiar problems?
The way I determined that the converter was not locking, was to
attach a lead to the TACH connection on the distributor and bring
it in the car and wrap the lead around an AM radio.  I got an
audible indication of the engine speed.  At 50 I varied the throttle
slightly and heard the pulse vary without a change in speed.

Irv McNair
ATT Bell Labs  Whippany