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Chevy Silverado and GMC Sierra Transmission Problems

506 messages,  Last post on Dec 01, 2009 at 1:57 PM

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What is this discussion about? Chevrolet Silverado 1500, Chevrolet Silverado 2500, Chevrolet Silverado 3500, GMC Sierra 1500, GMC Sierra 2500, GMC Sierra 3500, Transmission, Truck

#320 of 506 Re: Transmission problems in my 2001 sierra [hcamaro] by fordfan_17 Jul 07, 2008 (10:27 am)
Replying to: hcamaro (Jul 06, 2008 7:08 am) if the trans will go into reverse but absolutely no forward gears the input sprag (forward) is probably blown or the forward clutches are smoked. have it checked by a trans shop but your description is a blown sprag
#321 of 506 thanks by hcamaro Jul 08, 2008 (4:34 am)
#322 of 506 by hcamaro Jul 08, 2008 (4:37 am)
what would cause somthing like this happen.? It did sit up for about 1 1/2 year. Replies to this message: fordfan_17 (Jul 08, 2008 3:53 pm)
#323 of 506 Re: [hcamaro] by fordfan_17 Jul 08, 2008 (3:53 pm)
Replying to: hcamaro (Jul 08, 2008 4:37 am) well during the stored time trans fluid can drain down and leave parts open to air since the trans has a atmospheric vent to keep pressure from building if parts started to rust in a year + time and then load put back on them the metal has deteriated and possibly rusted away enuff to let the input sprag fail...
#324 of 506 1500 Silverado HD Auto trans by 1500_v8 Jul 09, 2008 (9:04 pm)
My truck was rough shifting from 1st and 2nd gear(alomost jumping). Also it would idle too fast. i finally took is to the dealer and they said is was the Throddle positioning sensor. The part by itself costs $140. For a awhile there I was getting whiplash. They fixed it and now the truck shift smoother than ever. I thought the trans was going. Whew! I hope this helps.
#325 of 506 Chevy Suburban mystery transmission oil leak by mechman Jul 18, 2008 (7:00 am)
I was driving ~70 mph, noticed rpm fluctuation and pulled over. Discovered transmission oil leak but was able to drive home. Replaced lost oil. Wiped everything clean, drove truck at various speeds up to 55mph and various inclines. No leak can be found. Did this several times. Still cannot located leak. Transmission shifts fine.
#326 of 506 Re: 2005 SILVERADO TRANSMISSION PROBLEM [kylec65] by dmbills Jul 18, 2008 (3:42 pm)
Replying to: kylec65 (Jul 17, 2007 7:51 am) I've had two transmission problems with my 2005 Sierra in the last six months. In both cases, it wouldn't shift into third gear. GMC goodwilled the repairs despite the fact that the truck was beyond it's warranty. The first repair was goodwilled at 42K and the second at 54K.   That said, it's important to note that I'm a regular customer at the dealership. We have all of the maintenance for the truck and my wife's GTO done at the dealership—oil changes, new tires, unscheduled maintenance, everything. They made a point of mentioning that this was a factor in their decision to pay for the repair. They figure that it'll pay dividends when I purchase my next truck and, quite frankly, they're right. I'm fortunate to have a good dealer and I'll buy from them again. Replies to this message: imready (Aug 16, 2008 8:54 pm)
#327 of 506 GMC 2500HD TRANSMISSION by park079 Jul 21, 2008 (9:07 am)
Transmission jumps out of all forward gears, have not tried reverse. If motor is turned off, truck will not start; there is no power to anything. Battery has a full charge. Truck will start with a booster but transmission continues to jump out of gear. Does this sound like a Throddle Positioning Sensor or something else? What about the motor not starting; is this related to the transmission problems?
#328 of 506 1994 Chevy Silverado - Where do I start? by a760chevy Jul 26, 2008 (8:26 pm)
Hello, I just purchased a non-operational 1994 Chevy Silverado with an automatic transmission. I purchased this vehicle to learn about automobiles and will be attending a Intro to Automotives course at a local community college in the fall. But anyway, when I put the truck into drive and hit 10 mph or more, I hear a rattle (sounds like a loose bolt in a pan, between the transmission and rear axle. As I slow down it quiets the problem. I'm thinking about taking it to the local AAMCO station for a transmission test. Does anyone have any other suggestions. Thx Replies to this message: obyone (Jul 27, 2008 12:49 am)
#329 of 506 Re: 1994 Chevy Silverado - Where do I start? [a760chevy] by obyone Jul 27, 2008 (12:49 am)
Replying to: a760chevy (Jul 26, 2008 8:26 pm) Interesting situation. You bought a 14 year old NON-OPERATIONAL truck to learn on. I'd suggest you ask the instructor his/her opinion. You could take it to AAMCO but I don't think you'll like the result of the test nor the free quote that comes with it.

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