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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

#450 of 506 Re: Tranny problems [mikesquid] by txredneck May 20, 2009 (1:23 pm)
Replying to: mikesquid (May 14, 2009 12:00 pm) I WOULD GUESS THAT IT IS THE SEAL AND THAT IT STARTS TO LEAK WHEN IT GETS HOT. I HAD A CAR THAT DID THAT AT ONE TIME. ADDED SOME LEAK SEALER FOR TRANSMISSION AND IT QUIT. IT TOOK IT A COUPLE OF DAYS BUT HAS BEEN GOING NOW FOR SEVERAL MONTHS WITH NO PROBLEMS. I AM NO EXPERT BY ANY MEANS BUT THIS DOESN'T COST MUCH AND I WOULD THINK IT WOULD BE WORTH A TRY.
#451 of 506 Re: 2003 Chevy Silverado ginding sound before and after trans replacement [hoookup] by txredneck May 20, 2009 (1:27 pm)
Replying to: hoookup (May 19, 2009 5:21 pm) IT COULD BE A LOT OF THINGS BUT SINCE YOU REPLACE THE TRANNY AND IT DIDN'T HELP I WOULD LOOK AT U JOINTS, BEARINGS, OR MAYBE EVEN THE BRAKES. WOULD HAVE TO NARROW IT DOWN AS TO WHERE IT IS COMING FROM TO TELL ANYTHING MORE.
#452 of 506 2001 2500 HD Duramax HELP! by ruftoyzdawtr May 23, 2009 (9:20 am)
I have an 01....we bought it about 2 months ago and it has been in the shop for the last month, we can't figure out whats wrong with it. It has an allison tranny, computer was reading bad tranny codes so we had the tranny rebuilt, had GM re-flash the computer. It didnt work, It was putting itself in limp-mode. Going to about 40 mph then shifting into neutral. It's still doing it even after the tranny rebuild. EVERYTHING in that tranny is new. Have tried a lot of things, replaced switches, rebuilt torque converter, etc. nothing has worked...still is in fail safe limp mode. Any one know anything about this? maybe give me some suggestions on what to check around for?
#453 of 506 Any info by bob261 May 28, 2009 (2:46 pm)
I have a 2000 Chevrolet ext cab 4x4, i have had the transmission rebuilt and now it will only go into 1st and reverse. The pump as been replaced and the valves all check. any ideas?
#454 of 506 2004 GMC Sierra Ext SLE 5.3l by 04sierraz71 May 28, 2009 (10:02 pm)
I bought a 04 Sierra with 110km on it from a dealer in Edmonton. It passed inspection and was delivered to me last night in calgary. Sometime today I was coming around a corner and I punched it a little bit, all of the sudden I heard a major CLUNK. Then it started reving like crazy. Now my truck won't move in D or 3rd, I had to limp home in 2nd gear. Super pissed because I now have to take it into the shop and I haven't even had it for 12hrs. Dealer was semi helpful in arranging a local mechanic, but I am worried it may happen again. And from all the posts in these forums my confidence if definitely hanging by a thread. Any thoughts as to why my truck moves like a castrated dog.....??? Replies to this message: saintal (Jun 27, 2009 6:37 pm) jcc1958 (Jun 27, 2009 8:49 pm) txredneck (Jun 29, 2009 5:01 am) harvey12 (Aug 03, 2009 7:08 pm) and 2 more...
#455 of 506 key removed when not in park gear by chuck1940 May 31, 2009 (3:14 pm)
My wife managed to turn our GMC Sierra 2001 automatic off and removed key when not in park gear. Now key will not turn, everything is locked up unable to get gearshift in park or to move shift in any way or to start vehicle.
#456 of 506 Re: Auto Transmission clunk [sonny24] by grantorton1 Jun 08, 2009 (8:32 pm)
Replying to: sonny24 (May 13, 2009 5:12 pm) I have a 2001 sierra bought it with 34,800 miles on it. Noticed a clunk every nopw and then. 35,200 on it the tranny went CLUNK and tranny was done......... no forward gears. $1800.00 + enjoy I did.
#458 of 506 Trans Problem by 94chevy Jun 10, 2009 (7:59 pm)
I have a question about my trans, I have a 94 Chevy pick-up with 300,000+ miles on it (yes with the same trans and engine that has never been open) eitherway here is my problem. I have the 4L60E model trans and it is not licking the converter in in its over drive gear (yes it is full of fluid) It did this to me once before and I found that it was the brake light switch, yeah I know sounds wierd but it made since and it was the problem, now I have replaced it again and thats not it this time, I have traced all the wiring that I can find with no breaks or loose wires that i can find. these trans are pretty simple and short of pulling that trans out I am sctatching my head. its probably somthing simple that i am not thinking of. Any ideas?
#459 of 506 1996 GMC Z71 tranny? by jcc1958 Jun 18, 2009 (8:55 pm)
I bought a 1996 GMC Z71 automatic ,the guy told me it had a rebuilt tranny and only had 5,000 miles on it.It did good on the way home but I didn't even make it home with it.First thing I noticed is I was going up a small hill and it started jerking some.I almost got it to my sons house but all gears went out of it so I put it in reverse and was backing up to get in his driveway and it stopped working.Well last nite I got in it and i drove it around the house a couple of times.I would have to put it in gear as soon as it started then after driving just a couple of feet it would stop again no gears and it would make this hissing noise sounds like an air hose to me.I cut the truck off and it would start again and go a ways then nothing again. Now I dont know for sure that it was rebuilt. I hate to have to buy one.Anyone else have this problem? I need Help Thanks in advance.

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