2003 Silverado LS auto transmission 1st gear problems - Chevrolet Forum - Chevy Enthusiasts Forums

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Old 08-10-2015, 07:45 PM
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Old 11-12-2008, 06:40 PM
Join Date: Nov 2008
Posts: 1
Default 2003 Silverado LS auto transmission 1st gear problems

Bought this vehicle back in '04 and it has always had a hard 'thunk' when shifting from 1st to 2nd and I thought, well, maybe it just shifts hard, but this weekend a new condition has occurred. Now it sticks in 1st gear and will stay there at very high rpms, unless I back off the accellerator and then pump the gas to coax it into shifting to 2nd. There are no problems once in 2nd, although the oil pressure gauge is pegged at max all the time. I've driven it about 8 hours since this first started.

Any suggestions or similar stories are appreciated. I'll bring it in if I need to, but if it is something like a pump or filter or anything else I may be able to save a few hundred dollars on by doing it myself, I'm game.

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Old 11-19-2008, 08:38 PM
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Default RE: 2003 Silverado LS auto transmission 1st gear problems

I have a 2004 silverado crew cab Z71 LS and it is doing something very similar. It has been shifting very hard from 1 - 2 and but only does it when driving with moderate power. If very light on the gas or very hard it doesn't do it. I just had the transmission serviced today (flushed) and it is still doing it. I have 68,000 miles on the truck and I am the second owner. I really like the truck but really hope my transmission is not going out....

I've searched the forum and can't find an answer - seen some similar questions but in higher gears.

Mine seems to be almost like a clutch slipping and then it engages really hard with a thump and only happens from first to second gears. It does seem to be getting worse.......

My wifes' 2003 2wd Tahoe LT is going on Friday to have the torque converter replaced but her truck was producing a high speed transmission slip code. I guess when it rains it pours..and I'm off on Friday for a 2,000 mile round trip hunting trip to Missouri....
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Old 05-13-2009, 01:14 PM
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Join Date: May 2009
Location: OBX
Posts: 8

1994 simular problems but now its stuck in 1st unless i manualy shift to 2nd. the anti lock brake light is also on. both things happened @ the same time. coincidence or re lated i have no idea.
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Old 05-13-2009, 04:18 PM
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cleaned the speed sensors on the front wheels and replaced the rear speed sensor and it was fixed!!!!!!!!!!!!!!!!!!!!!!

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Old 08-24-2009, 07:29 PM
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Join Date: Aug 2009
Posts: 1

i have a 2003 silverado and it does the same thing i have 50,000 on it just noticed it about 4k miles ago i have no idea wat it is almost like a shift kit
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Old 08-24-2009, 11:28 PM
lukemoore646's Avatar
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Join Date: May 2009
Location: Munden Kansas
Posts: 289

give your dealer bulletin #03-07-30-020, it is a harsh 1-2 shift tsb from chevy
Sometimes I wonder if engineers were put on this earth to make a mechanic's life misserable.

Co-founder of LO-maintenance:
The one stop shop when your tranny drops.
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