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From: bccarty@whuts.UUCP (Brian C. Carty)
Newsgroups: net.auto
Subject: Re: 4 Speed GM Auto Transmissions
Message-ID: <216@whuts.UUCP>
Date: Tue, 6-Aug-85 11:00:54 EDT
Article-I.D.: whuts.216
Posted: Tue Aug  6 11:00:54 1985
Date-Received: Sat, 10-Aug-85 04:49:34 EDT
References: <2749@harpo.UUCP>
Organization: AT&T Bell Laboratories
Lines: 23

> Does anybody had any experience with the 4 speed automatic transmission
> used in Buick Park Avenue or Oldsmobile 85 cars.  I now have a second
> transmission in the car and at 8000 miles on it, there are problems
> in downshifting rom the overdrive to drive speed.  It does not happen
> all the time but it can be a very rough shift.  I believe it is down
> shifting from 4 to 3 without removing the lockup on the torque converter.
> The service manager claims that is the way it is supposed to happen
> but the 800 number for Buick claims the torque converter lockup
> is supposed to come off before the downshift.
> 

I think the service manager is correct.  The transmission is supposed
to be a regular 3 speed with torque converter plus an overdrive gear.
I've only had experience with this trans on one car (a rented Caprice)
and the shifting behavior confused me too at first, because I felt two
pulses when I shifted from 2 to D manually.  Either way, you would get
similar shifting behavior if the car was trying to downshift from 4th to
an unclutched 3rd gear.  I found it rather fun myself, but then I never
liked automatics that shifted meekly anyway.
-- 
	Brian C. Carty 		AT&T Bell Laboratories - Piscataway, NJ

		..!{ihnp4|allegra}!whuts!bccarty