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Transmission slip? 2003 Z71

redneck54's Avatar
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Join Date: May 2011
Posts: 1

May 28th, 2011, 11:04 PM   #1  
Transmission slip? 2003 Z71

Hey guys, long time reader and first time poster here.

So here is the deal. I have a 2003 Silverado 1500 Ext Cab Z71 and yesterday I did an oil change on my truck. Currently I have about 257,000 kms on my truck and I switched from Castrol Syntec which is what I have been using since the truck was new, and switched from this to Castrol High Mileage. It was only an hour of driving later that I all of a sudden had some weird things happening. I was on my way home on the highway and the truck started to have fluctuating RPM's while I was in cruise set at 100 km/h (60 mph). It would fluctuate 2 or 300 rpms occasionally. Then my check engine light came on before I got home, and then when I got home and shut the truck off, went inside to grab my code scanner, and came out and started it and the check engine light was off. So I couldn't even pull a code. So now today I did some other maintenance stuff (rotors, brake pads) and took 'er out on the highway to check some stuff out. The transmission is not itself. In the city at first I noticed the truck was revving quite a bit higher before shifting gears then it was prior to my oil change. Then going out on the highway I was getting somewhat of a delayed throttle response and the RPMs were just not matching the speed. When I put the truck in cruise control the RPMs were all over the place, the truck wanted to keep revving up and revving up. So needless to say after doing hours of research I don't know what the hell is going on and I don't really want to go out and spend a bunch of money on new sensors and stuff just yet.

My main question really is, was it the oil change that would've caused this or is it just coincidental? Anyone had a similar experience, regardless of oil change first?

Any feedback is appreciated.

basilkies's Avatar
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Join Date: Jan 2011
Posts: 176

May 29th, 2011, 10:43 AM   #2  
There was something about a similar problem a month or so ago. In that case the transission was going bad do to some type of plastic sleeves in it. The solution was to rebuild the transmission at non dealer shop and use a metal replacement part for the plastic.

UBUGNME's Avatar
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Join Date: Aug 2014
Posts: 1

August 25th, 2014, 2:52 PM   #3  
I have the same problem as REDNECK54. I have a 2003 CHEVY SILVERADO Z71 I recently changed my sensors and it was still slipping so I changed the transmission also. Now that its changed it ran good for about 20 to 50 miles and it started to slip again. So I have no idea what else to do?

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