Transmission does not downshift to fi...

Transmission does not downshift to first when coming to stop

Posted in the Isuzu NPR Forum

Edward

Randolph, MA

#1 Sep 9, 2010
It's 2002 GMC W5500 (basically an Isuzu with a GMC badge) automatic that I just had serviced @ 60,000 miles. The shop flushed the transmission. Now it doesn't want to downshift into first when I come to a stop. It makes a vibration/grinding noise. Truck wasn't do this before. The shop also supposedly changed the transmission control module after I brought it back. I also noticed the J Brake is no longer engaging too. Any ideas? Thanks in advance.
Ed
sal

Glendale, AZ

#2 Jun 18, 2011
I have a 2001 gmc w4500 and it has the same problem. It does not down shift to first when I stop, not all the time though. When it does happen it shakes like crazy, do you know the problem?
Sweeperman

United States

#3 Mar 11, 2012
I have a 04 w4500 and it does the same thing, gets stuck in 2nd gear and vibrates severely, this is a replaced transmission in my truck. Is your transmission light on? mine comes on every now and then for about 5 days and abs light then goes away

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