Question about 2002 GMC Sierra 1500
In my 2002 gmc sierra 1500 4.8l my trans seems like it will not shift into 2nd gear. first gear revs up to around 3000 rpms before shifting and will not shift at wide open throttle. all the other gears are fine and trans fluid is filled. seems like it just skips 2nd also when i pin it what i believe is to be in 3rd gear it will skip 2nd and go straight to first. i have no idea what it could be. feedback is appreciated
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Posted on Jan 02, 2017
SOURCE: hard shifting
U may have a dirty valve body passage, have u changed the trans fluid and filter in the last 60,000 miles,. if no do and use the new GM Dexron VI trans fluid, it has greatly improved shift characteristic's and has the best detergent property out there to keep the trans clean. I have personnel experience with this fluid in my 96, I was amazed.
Posted on Dec 24, 2008
This has a 4l60e trans. There is no "passing gear cable" it is all electonic. I would recomed making sure the filter did not fall down into the pan. When you removed the old filter there should have been a fitting on the end of it like the one you installed with the new filter a rubber seal set up that slips onto the snout of the filter. These usualy don't come out when you pull the old filter out you have to remove them with a tool.(a pic will work if you are careful) I have seen this happen before where a person did not remove the old fitting and this allowed the filter to drop into the pan.If you did change the fitting out I would still check to make sure the filter has not dropped. If the filter is ok then you have another problem. There is a switch on the driver side of the trans that the shifter linkage is connected to this may need to be adjusted. It is not hard to adjust but I recomend getting yourself a chilton or haynes manual from a local parts store for about $20 It will be a big help for ya.
Have a great evening.
Posted on May 01, 2009
SOURCE: When my 2001 GMC Yukon
this sounds like the pressure valve is going bad on third gear. cheap fix try Lucus transmission additive to increase the pressure.
To do it right go to a good transmission shop an have it serviced and flushed.
Posted on Sep 27, 2010
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