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Path: utzoo!watmath!clyde!burl!ulysses!allegra!princeton!rocksvax!billj
From: billj@rocksvax.UUCP (Bill Jeffers)
Newsgroups: net.auto.tech
Subject: Re: harsh transmission engagement
Message-ID: <1646@rocksvax.UUCP>
Date: Thu, 5-Dec-85 10:57:13 EST
Article-I.D.: rocksvax.1646
Posted: Thu Dec  5 10:57:13 1985
Date-Received: Fri, 6-Dec-85 07:28:11 EST
References: <148400001@uiucdcsb> <1336@jhunix.UUCP>
Reply-To: billj@rocksvax.UUCP (Bill Jeffers)
Organization: Xerox: Henrietta, NY
Lines: 30
Summary: 

In article <1336@jhunix.UUCP> ins_aeas@jhunix.UUCP (Earle A .Sugar) writes:
>> 
>>   The automatic transmission of my '77 Plymouth Volare is producing a 
>> heavy thump when shifted from Neutral to either Reverse or Drive.
>> The harshness of the transmission engagement is roughly proportional to
>> the idling speed. The thump can jolt the car at cold idle speed (1400 rpm),
>> but is tolerable at hot idle (700 rpm). The level and quality of the 
>> transmission fluid has been checked out fine, the idle speeds are 
>> also alright.  Other than the stated problem the trasmission works fine
>> (no delay, no slippage). I would appreciate any pointer
>> to the probable cause of the problem. Thanks.
>> Kaihu Chen
>> {ihnp4,vonvex,pur-ee}!uiucdcs!chen
>The problem may be elsewhere in the driveline.  Worn U-joints on your driveshaft, 
>a worn differential, etc. may cause a clunk when the transmission is engaged 
>from neutral or park into drive or reverse.  
>
>Earle A. Sugar


This may also be normal. Automatic transmissions can object to being put in gear
at 1400 rpm (a little high). The cold idle speed can be adjusted but stalling 
problems may result. If it was my car I would adjust the cold idle down to about
1000 and try it. If stalling occurs tweak it back up. Anyone know what the 
service manual says the cold idle speed should be.

the slower the idle speed the smoother the engagement.


					Billj