Chevy Silverado and GMC Sierra Transmission Problems

chrmdome

Greetings:

I picked up my 2007 Silverado K1500, 4x4 Crew on Friday, March 9th and noticed the same problem. Rough shift from 1st to 2nd. It had 5 miles on it when delivered. Now at 36 miles the shift is smooth. I attributed the rough shifting to incomplete trans fluid distribution. I have driven the truck at low speeds for last two days and am not noticing any rough shifting now.

Chromedome, San Diego

dustyk

The 4L70E and 4L80Es have new shift control assemblies and are now semi-adaptive. Your transmission was probably going through it's learn cycle. I think you'll find that if you ever disconnect the battery for a minute or two, it will do the same thing.

Dusty

pins

I have a 2004 Sierra, same thing with my shifting. I have had it in twice and same as you, I have been told this is normal. Love my truck!

oomag12

42,700 miles on all highway miles, no hauling or towing. Anyone else had any troubles with new "hydromatic" trannies???

october2525

My 2004 GMC Sierra 2500HD 4 x 4 looses power when my transmission temp gets between 180-200 degrees. It only gets hot on the hot summer days or when I tow my boat. There is also an unusual noise(higher RPM?) in the transmission when I take off after sitting a controlled intersection. I get my vehicle serviced on a regular basis. I have yet to take it into a dealer..any ideas?

oomag12

42,700.. easy on her, no hauling, no towing..all highway miles....just went, no warning. I did have a little ride on slush ice the day before she went, down shifted and upshifted from D to 3 maybe a dozen times. next day, slipping and serious grinding growl. perplexing indeed. My 97 Jimmy Z-71 v-8 4wd has been bullitt proof..I am knocking on wood. Any insight. 06 did start using a new trans type correct?? I have the v-6 vortec WT 4 sp auto 2wd. Uses the new VI fluid type.

iamlemko

06 Silverado, tranny shifts really hard from 2nd to 3rd gear in the automatic, or maybe it is just me......

likearock

Start saving your money for a new transmission, GM Will be of no help, Afterall this is normal according to their service notice.
I sold mine after getting tired of beating a dead horse trying to talk to G.M.
I took a gamble and bought a 2500 HD with a Duramax diesel and the Alison Transmission, I am very happy with this truck and the transmission is great. but will never buy another G.M 1/2 TON truck again.

Good luck

paisan

This is good to hear Likearock. I'm always worried about trans issues on any automatic trans.

-mike

bumperdude

i bought a new style 07 1500 w/the 6.0 vortex max package. the first gear always sounded like it had a whine but at 7,500 miles it has gone. bought it dec 05 2006. it came apart and gm said they will rebuild it. i wanted a new transmission but the warranty says rebuild. i will be taking them up on that new 100,000mile factory warranty.

catfish2

Besides the normal 4.8 Carbon Tap, my Truck runs like a clock. 200+ miles a day. 19-21 MPG. I have 190,000 miles on it now. For the last 10K miles I am experiencing a violent bucking at between 50 and 60 mph. It seems to only occur when I am cruising along, with or withour cruise control, and hit an upward grade. If I hit the brake it eases up. It also seems to disappear if I go in to passing gear. I also feel a gentle bumping at idle with my foot on the brake. Could this be a Tourque Converter problem? Chevy wants to do a Tranny Swap $2, :confuse: 500.00, but hasn't even checked it out. The Truck has been well maintained. Has anybody else had this experience?

mrahn

My Z 71 has 17,500 (+-)miles. Initially I took it in because it shifted rough out of first gear from the git-go. They reprogrammed the computer which did nothing for the shifting problem, but ever since occasionally when I start it up, it will be in four wheel drive. I have had it back two more times, the problem continues. I also am only getting about 14 mpg, and I drive about half highway miles. Something ain't right.

rmart30

rmart30

Ive got a 96 Chevy 1500 that just rolled over 100k. Went to the store this morning w/no problemns. Came outgot in truck and went to back out and had the awfullest noise from the tranny.
It sounds like when your brakes are completely worn and grinding metal to metal. It does it in rev, 1st, and in o/d but not the other fwd gears. I drove it back home 25 miles and it doesnt slip and shifts fine, just has the noise on take off and when it hits O/d...... anyone had this problem before?

oomag12

With the tranny fried at 42,700 and GM's best offer is half of repair costs, it appears buying GM might not be to intelligent. They(GM)know the legal costs equal or outway the tranny, so their not worried there either. I honestly have been a GM person my entire driving career. But, you know Toyota might not be a bad choice.

oomag12

Well, GM agreed to absorb half the cost of 3600.00 new installed tranny. I spent a week on the phone, and thats the best i could drag out of them. They know at that price, legal recourse by a single individual is not likely. Believe me, they really try to push you over the edge, they want you to go off and get belidegrent so they can justify denial of the claim. I did locate a salvage 06 trans with 2K for 1000.00 and its warranted for 2 years or 20K. I'm a lifelong GM guy, I have gone to bat for the brand countless times, but like the treachory of so-called close friend, i really stupid for it at this time. I let thier customer service folk know how i feel also. Thier CEO Waggoner, has corporate mission statement, that basically says Integrity and customer enthusiam were GM's top objective. What a joke. You can read it on thier site. I quoted him during negociations and i believe it helped to get them to cover half. Really, I don't believe i will ever buy a new GM product again. :lemon: :lemon:

bunn

Have 99 GMC 1500 4x2 w/5.3 and also have transmission problem. Took back to dealer where I bought the truck and they are saying $3000 to fix? (Dodge dealer)

obyone

The dealer doesn't usually fix transmissions, rather they send it out to a transmission shop locally who either repairs it or goes to the junkyard for a used one and overhauls it. So of the $3k you were quoted, a local transmission shop would probably quote you $2k to fix. Doing the math, I'd bet the Dodge dealer is charging at least $1k for his troubles.

Also figure it this way. What does a Dodge tech know about GM trucks?

jimsevers

My 2 cents...Unrelated to this specific issue.

I would be very reluctant to buy a used vehicle from a competitive dealer (GM from Dodge...Ford from GM, Dodge from Ford...etc, etc). Seems to me there is a strong possibility the person that traded in the vehicle changed brands for a reason, such as losing confidence in the brand he had due to a bad experience (Conquest sale). I'm not saying this is always the case, but it would have me suspicious. Just thought I'd share my opinion on this.

I agree that bringing it back to the dealer to have the trans fixed is not the most economical way to do it, unless you are trying to get them to back it up and cover some of the cost. Once they refuse that, I would hightail it to the nearest Transmission shop and have it done by specially trained transmission technicians.

dustyk

A certified transmission technician on any product would be qualified to work on just about any automatic, they just may not have the experience dealing with specific problems. In my experience, most dealerships needing to have a competitive model's transmission repaired would send it to an independent transmission shop, or slip in a certified off-the-shelf rebuild.

On the other hand technicians move around. I wouldn't be surprized if a current Dodge or Ford transmission technician hasn't had a TG350, TH400, or a 4L60/80 apart sometime in their life.

Dusty

obyone

Having it apart and putting it back together are two different things....

deleonc2

The P0700 code is the Transmission Control System- We have that code on our truck now. We have a 2004 GMC 2500 as well. If you go to Allisontransmission.com they have downloadable manuals to troubleshooting and stuff. Since our truck is over the 100,000 mile warranty, we are going to try to figure it out ourselves for now :-) Hopefully some of what I wrote was useful.

noobie1

I had this same DTC recently, but after the SES light went out I continued driving. Some time later, last Thanksgiving week, on a trip to a family gathering in Texas I got stranded in New Mexico for two days; only had Reverse and 3rd. The local dealer there couldn't get to it for a week so I opted for a very spendy haul to Texas. I expected the worst, bracing for a very hefty bill from the dealer there for a transmission replacement. Turned out to be the NSBU Switch (Neutral Safety Back-Up), $46.35 + Labor. What a blessed relief!

Now, rather last week, it returned, plus two more: P0843-Trans Fluid Press Sensor/Switch A Circuit High and P0875-Trans Fluid Press Sensor/Switch D Circuit High

I'm not sure what I'm going to do about, whether to fix it myself or let it slide. The SES light went out after three ignition cycles without diagnostic failure, and I don't drive it much any more, only about 200 mi. in the last 4 months, which may be a contributing factor. Probably the latter. I know if I were in Texas what I'd do; I'd take it back to the dealership that fixed it before. They were terrific, the rare exception; I can't applaud them enough for the way they treated me; Don Helm Chevrolet, Graham Tx.

-David

maness

07classic

I just got an 07 and it had the 5 year 100K warranty. was this new for 07? I would of thought the 06 had the same warranty but i didnt know for sure..

paisan

GM starterd the 5/100k for MY07

-mike

knofler

Have you tried replacing the fuel pump relay? It shouldn't cost more than like $12 for that model truck. If that's hanging up occasionally, it might explain your problem. Almost for sure if you've done any welding on the truck without first disconnecting the battery. Good luck!
Glen

litalow79

josel3

Am I mistaken or did I hear word that light duty chevy silverado will come out with a 6 speed transmission? If so any idea as to when they will be here?
thanks

chain1

My 06 silverado Z-71 has similar issues. When accellerating, I get a surging clear upto 60mph or better like the torque converter is slipping. It also acts as if I'm starting out in 3rd gear all the time. The only time it shifts worth a darn is when it's in tow mode.
This truck also has the 5.3 HO -12K on the truck and gas mileage has hit the floor. Went from 19mph on the hgwy to 15 max and maybe 10-13 in town.

catfish2

I posted here a while back about my Transmission bucking at between 55 and 65 mph, when ever I hit a small grade. It was the Torque Converter clutch pack. I did a total rebuilt swap. I then drove the truck to Florida and Back from Maryland. Top MPG was 20.2. Most though was 18 - 19 mpg. I was loaded down with drinking water and sodas and had the pedal to the metal. 75 mph most of the way. Averaged 66.4 mph. I think thats pretty good for a full size extended cab truck. It cost 2,250 at the dealer. Oh by the way, I have 195,000 miles on that truck and the fix came with a 5 year warranty. Thanks Jeff (Service Mngr.) from JBA Chevrolet, Glen Burnie, Maryland. You dah man.

skytop1

Chevy is not scheduled to get the new Allison 6 speed transmission until 2009. If you want this state of the art transmission, just purchase a high output V8 GMC and you will get it. The GMC division is essentially sharing most major components with the Cadillac division and as a 'premier' division will enjoy newly released technology first. The Allison 6 speed is a sweet dream to use.

mlemoine1

Guys,the allison is only for the duramax.The tahoes and 1500's are getting the gm 6 spd.

josel3

jlandon

jlandon

I recently bought a Bully Dog programmer and was running it in the performance mode on my 2000 Z71. Yesterday while driving it, all power going to the drive shaft was lost and there was a loud metal grinding noise. The transmission seems fine however since using this programmer when sitting idle then accelerating there is a slight delay in response then a jerk into first gear... it felt like the torque converter might have broke or some bolts may have sheared off from this over. When put into any gear including reverse when in idle now makes this grinding noise and it wont even sit in park. Any clue on any of this would be most helpful. thanks!!

mdsxs4

I think I would be nervous. I have a 2007 crew cab that the transmission went out at 17,000 and again now at 27,000. I don't pull any trailers or get in the mud. It is all highway miles. It is in the shop now waiting to be repaired.

tbarwick1

Hello all,
I am new here and this is my 1st post. I have hopes that someone in this forum can tell me what is the problem causing my 83 truck to not move in Drive or 2nd? It is full of fluid and it appears red and not burnt or brown. It has been changed within the last 10k miles. Could it be the modulator valve? It will go in L1 and Reverse and when put in drive you can feel it engage and try to move but it just kinda makes a whining noise. Same with L2. I thought I would ask before changing the modulator, fluid, and filter, and wasting the money, same. I may need it for a total rebuild which I am sure will be expensive. Any help or advice would be greatly appreciated.

djg5211

Hello All,
I just registered and did some searching and browseing but i didn't
see any posts with my exact problem so here it is....

Firstly, here's what i have:

2002 Silverado 4X4 Z71
Vortec 6.0 engine
4L60E Automatic Tranny
Mileage = 40,000

I just replaced the Sun Shell and i now have reverse etc. however,
i have slippage in 'D' which is present in 2HI and 4HI. No slip
in 4LO and no slip in reverse in any range.Before the Sun Shell
took a dump everything was okee dokee (well... Chevy okee dokee
with the normal clunks etc.) but no slipping. Fluid level is at
proper level and once it gets moving it will shift gears. If i
manually shift ie: put the gear selecter in 'FIRST' no slip. Now,
i assume that i must have missed something. I did pull the pan
back off and recheck everything underneath (replaced the VB gaskets
while it was out).

Now... I have been told a couple of different
things by a couple of techs but i don't want to say what they said
as i want some fresh views and then i'll compare notes.

Any input appreciated!!!
Dave

hambone5

i have 160,000 miles shifts fine when cold but when it warms up it no longer will go into gear any info would be greatly appreciated

david

tdscriner

i am new here. I need to know if a 4 wheel drive transmission will go into my 2 wheel drive truck? I have reverse, 1st & 2nd.

KCRam

Transmissions are interchangeable between 2 and 4 wheel drive. It's the separate transfer case that sends the power to the front axle.

kcram - Pickups Host

gmctruck

Sad to see GM is still having the same problems on the newer trucks over the last several years. I'm not really surprised, but where are the quality improvements GM?

GM asks me to pay 30k+ for a new truck that has similar quality issues to my already paid for '99 Sierra..... No Thanks GM!

marty97

Just bought a 97 Sierra 2500, 92M miles, checked out by a mechanic. Runs fine, but everytime I drive to my cabin, at about 100 miles into trip (same spot in road on MN 48 25 miles E of Hinckley, MN) ABS light comes on, speedometer drops to zero, then flutters, tranny slips/cluncks, and can only go about 30 mph. After a while everything returns to normal. We've run it farther distances on hot days, even pulling boat - no issues. Mechanic is mystified - no codes. I love this truck. Please help!

tdscriner

that does sound weird!!! Well we have a 98 Sierra with 160,000 miles & have gotten two suggestions. One is it needs a new tranny & the other is take to a mechanic & run a diagnostic on the tranny to see if it is the electric shift sensor. Either way it needs help. We only paid $500.00 for it so it is well worth fixing, the engine is a 350 vortec & it is sound. My husband works is a oilfield driller so it will be a work truck (maybe LOL) Hope this helps. Shannon

obyone

under that spot in the road....

If it is the tranny you could be looking at a $2K repair bill for a $500 truck with 160K miles.

shinychevy

My '05 Silverado Z71 came with 265/70/17's and I put on some 275/60/20's about a month ago. They are about 1.4" taller than stock. About a week ago, my truck started vibrating when slowing down, almost like it's not downshifting properly. Could this be caused by slightly taller tires? I put the stock wheels back on, but it still does it.

obyone

brake wear, throw off your odometer and speedometer readings, create harsher ride etc etc.

Why didn't you install 275/55 instead of the 60s? It would've given you the same stock height of the 265/70 profile thus unchanging your odometer and speedometer?

I seriously doubt that the changed caused any damage to the 4L60E. I'd leave the stocks on and take it into the dealer to check out if you're still under warranty.

Not sure if this will help but you could also try and unplug the battery for 30 minutes then reconnecting and trying it again.

shinychevy

Thanks Obyone, I knew it would throw off my speedo, but only about 2.6 MPH when I'm doing 60 MPH. I was going to use 275/55, but I bought a used tire & wheel package on Ebay. I didn't think it could damage the tranny, it worked fine for 3 weeks with the 60's. I've got an appt. at the stealership, and I do have a little bit of warranty left (about 500 kms). I'll try the battery thing, does that reset the computer somehow?

obyone

Yes unplugging the battery will cause the computer to reset and since its a 4L60E with the E standing for electronic, it should reset the trans as well.

The larger tire size does one other thing. It increases your warranty mileage period. Not by much but it does increase it...