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Chevy Silverado and GMC Sierra Transmission Problems

503 messages,  Last post on Nov 10, 2009 at 5:28 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

#452 of 503 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 503 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 503 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 503 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 503 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 503 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 503 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.
#460 of 503 In reply to the 1996 Z71 Tranny problems by ruftoyzdawtr Jun 18, 2009 (10:16 pm)
Sounds like it wasn't rebuild, OR it wasn't done right. something could be clogged or not hooked up all the way. Price a new one, but before buying one, price how much it would cost to have a shop tell you EXACTLY whats wrong, if it needs to be rebuilt/replaced then ask how much they would charge. Usually a little cheaper to have it rebuilt, but I wouldn't advise you to tell the shops you talk to that it has supposedly already been rebuilt. Most shops WON'T touch a tranny thats already been reuilt, they will say you need a whole new one. Good luck. Replies to this message: jcc1958 (Jun 19, 2009 12:38 pm) jcc1958 (Jun 19, 2009 2:35 pm) jcc1958 (Jun 19, 2009 2:36 pm)
#461 of 503 Re: In reply to the 1996 Z71 Tranny problems [ruftoyzdawtr] by jcc1958 Jun 19, 2009 (12:38 pm)
Replying to: ruftoyzdawtr (Jun 18, 2009 10:16 pm) thanks I guess the guy knew it was bad he didnt return my calls or emails.I wonder why at times it will go in gear and go about 10 feet or so then stop pulling at all when it does this is makes a hissing noise as i said then you can turn it off then start back up and put it in gear as soon as you do and it will go again for about 10 feet then when that noise starts making that noise it will stop again.I hope its not the tranny I sure would hate to spend that much on it to get it running.I didnt realize that chevy and gmc trans were so bad to go out.I did price a new one they said around 2,000.00 for the trans and labor. Thanks

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