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Chevy Silverado Problems



  • ryanbabryanbab Posts: 7,240
    What other fluids satisfy all gm's standards? None. I know its pretty much a rip off but i am a play it safe kinda guy.


    I have almost 17,500 on my truck. No problem with rear axle. Just preventative maintenance

  • obyoneobyone Posts: 8,065
    told you to use would have met all of GM's standards? doh! I used lubriplate 75-90w when I changed mine. Is it better than what GM has betcha. Same goes for most aftermarket petroleum products. BTW, lubriplate is specified by GM as a lubricant to use on the door hinges, etc.

    As far as warranty, I think the dealer and GM would be hard pressed to prove that the oil you used in your rearend caused its failure. Same as the fram filters....they may be crap but no one can prove that it caused an engine to fail.
  • abc246abc246 Posts: 305
    Has anyone had the driveline resonate or rattle when towing or hauling heavy loads in overdrive with the torque converter locked when engine is lugging before a shift? Problem happens in 3rd also under the same conditions. This truck is a V-6 auto 4x4 reg cab.

    I think it is the driveshaft, but not sure. When using tow/haul mode when towing over 60 mph the truck will shift in OD unless I keep it in 3rd. When towing about 5000 lbs the truck sounds like a piece of junk when the engine is running at low RPMs with locked torque converter and the truck is under heavy load. Is there a TSB on this?

    If there is a TSB I hope they do not reprogram the transmission to unlock the torque converter earlier because this will generate more heat in the transmission. Anytime the torque converter is open it is slipping and generating heat, but I could see GM doing that.
  • abc246abc246 Posts: 305
    Is this a good idea? Does GM void the warranty if you use one? I connot find a cooler that has the correct fitting to the radiator. For some reason, none of the half ton trucks come from the factory with one.
  • ryanbabryanbab Posts: 7,240
    sounds like what my truck is doing at about 35mph. I was told there is no fix. This after taking it in twice.

    I did kinda fix it but not totally. I set my HPIII for shiftfirmness so it doesnt lug between 30-40mph as much but it still does.
  • rayt2rayt2 Posts: 1,208
    Ryan, You do not void the warranty by using other mfr's. products, remember that federal law quoted here quite a few times? I don't recall the name, but I'm sure one of our fellow readers here could quote it for you. The Vehilce manufactorers are trying to create a monopoly by telling you this and they are dead wrong. It's like telling me if I buy a product made by Menards and don't by their replacement parts for a repair I void the warranty...baloney! Thats why you have Aftermarket Parts Mfr's. Assoc. so everyone gets a piece of the pie!

    Obyone is correct, go to PepBoys, AutoZone, NAPA, CarQuest etc. or whatever parts store you have in your neck of the woods and get the 75w-90 gear lube you need, save a few bucks and take your girlfriend out to the drive-in movies, the rest is up to you.

    Ray T.
  • ryanbabryanbab Posts: 7,240
    I know it wont void my waarranty unless they can prove it. And if something does happen they can say it doesnt meet a spec (i forget which one it is) and wont cover it.

    There is a specification which mobil 1 etc does not meet.

    How bout i spend the extra money and take the gf out and have piece of mind we are going to make it there and back?

  • rayt2rayt2 Posts: 1,208
    is generated more with the tranny hunting back and forth for a norm under the driving conditions/load carried. If your hauling heavy loads why would you even think about running in overdrive, put it in 3rd Tow/Haul mode and leave it be.
    As for an oil cooler you must not have the factory tow package because it comes standard w/oil cooler otherwise you may have to get the OEM from dealer since you have run into problem locating aftermarket.

    Ray T.
  • rayt2rayt2 Posts: 1,208
    You sure don't have much faith in your Chevrolet product do you, since when is a dealer going to send your tranny fluid out for analysis upon a failure??? if your rearend blows in that truck I'd say you need some driving lessons from Skip Barber.
    But like Oby says dealers couldn't survive without people who think like you, but whatever floats your boat and makes you happy, good luck on this one now.

    Ray T.
  • ryanbabryanbab Posts: 7,240
    Dealers dont come up with the specs for our trucks. They dont print them in our owners manual either
  • obyoneobyone Posts: 8,065
    Moss-Magnuson Act prohibits the dealer from doing exactly what you're saying.

    What specifically doesn't Mobil1 meet in terms of specifications? What about Royal Purple? Lubriplate? Who do you think makes that special GM gear oil? ain't GM.

    That's all for sense in beating a dead horse...or jackass in this case....hehe

  • ryanbabryanbab Posts: 7,240
    getting so worked up over this?
  • dch0300dch0300 Posts: 472
    When I call my dealer about getting the diff. fluid changed on my 2001 Z-71 with a locking diff. he quoted me a price of around $155. He said that included $90 for the synthetic fluid, $10 for an additive, and $55 for the labor. Do you have any idea what is this additive is they are talking about?
  • ryanbabryanbab Posts: 7,240
    Tell that dealer if he puts that additive in the rear end of your truck you will beat him with a baseball bat. Only the pre 99 trucks use that stuff. Everything else sound right.

    Seriously why dont you do it yourself and save some money?

    Check this out

    Looks pretty easy only thing i am worried about is putting the fluid back. Looks tricky


  • ryanbabryanbab Posts: 7,240
    i am changing mine hopefully on sunday so ill let you know take pics and such

  • obyoneobyone Posts: 8,065
    SPECIAL GM fluid....but the guy at the dealer synthetic? Life sure is tough on these major projects....hehe
  • ryanbabryanbab Posts: 7,240
    Went to "my" dealership. Got 3 quarts and a gasket.

    All ready to go now. THis guy tried to argue with me. He like you NEVER have to change the rear end fluid. Ok whatever dude. I was like well your gonna lose a big sale. He shut up quick

  • jaguar0027jaguar0027 Posts: 387
    Where do you guys get all the info/pics on the maintenance for your Rado's?

    I agree with oby and ray. Synthetic is NOT going to void your warranty. If Chevy told you that that is BS!

    My 2 cents anyway...

  • ryanbabryanbab Posts: 7,240
    Synthetic is what you are supposed to use in the rear end.

    Gm says the fluid you use has to meet certain specs. If it doesnt meet the spec its no good in my book

  • obyoneobyone Posts: 8,065
    Exactly, what specs doesn't Mobil 1 meet?
  • ryanbabryanbab Posts: 7,240
    I do not have my owners manual handy but there is one that mobil one, redline, and royal purple do not meet.
  • ryanbabryanbab Posts: 7,240
    I too am getting ready to change the rear diff lub in my 2500HD. Here's what I have found out. GM part# 12378261 is produced by Texaco; Texaco's part# is 2276. This product is NOT available to the public; i.e. we can't buy it. Following is an email that I recieved from Eaton:
    "Eaton Torque Control Products produces the locking differential that is available under the GM G80 option code. American Axle & Manufacturing produces the axle assembly that our product is installed in. The lube is specified by GM and as such all of our validation testing, as well as AAM's,was done using the 2276 Texaco product. Other products that meet GM's requirements probably exists, however we have not validate any. I would stick with the recommended lube."
    Following is an email that I recieved from AMSOIL:
    "GM part 9986115 is Castrol Syntorq which our recommended replacement is our AMSOIL Series 2000 75W90 Synthetic Gear Lube."

    This is very interesting because I talked with Castrol's tech line and they said that they do NOT have a product to satisfy GM spec 9986115. Valvoline, Mobile 1, Pennzoil also said that they do NOT have a product to satisfy spec 9986115.
  • 4x4man4x4man Posts: 222
    I'm not ready to change my diff fluid yet, but you have two part numbers listed for the lube in your post above, which one is it?
    In the beginning you state it is GM part# 12378261, then the email from AMSOIL states GM part 9986115. Anyway, trying to keep up (with the discussion that is)

  • mledtjemledtje Posts: 1,123
    Is the lubricant required for the NV4500 5 spd manual trans behind the 6.0L engine. The trans even has a tag on it stating warranty is void if any lubricant other than Castrol Syntorq is used.

    Probably not a problem behind a 6.0L, but the same trans has been used behind Dodge Cummins Diesels and that may be the issue. The Cummins can put out more torque than the 6.0L (duh) and the trans may need that lubricant to survive at max rated torque.

    Ryan, what does that have to do with your final drive?

    Mike L
  • obyoneobyone Posts: 8,065
    but a part number. If they don't know what it is, how can they tell you whether it meets it or not. I would have told you the same....I don't what that number is so our product can't meet it.

    I too am curious as to what the first part of your post have anything to do with the second part? Other than get people confused? There is a difference between the trans and the rearend if in case you didn't know. One is located in front of the other and they don't take the same fluid.
  • abc246abc246 Posts: 305
    The V-6 is rated to tow 5300 lbs with 3.73 and auto with no extra coolers. I am do not know what the V-8s can tow without the trans cooler. I am not sure why they differ. Does the V-6 use the extra radiator capacity for the trans?

    I tow with this truck much of the summer. I read somewhere that GM did not like add on trans oil coolers and my void the warranty if there is a trans problem. I am not sure if I should add one.

    My Blazer manual states that full trailer towing (5600 lbs) requires no extra coolers also.
  • rayt2rayt2 Posts: 1,208
    Trannys, why do you think they put a temp gage for trans fluid in the 2500 rado w/6.0L engine?? I would have liked to had that option for the 5.3 when I bought my Y2K 2500.
    I had the first model year production Chevy Ext. Cab 1500 in 1988 w/the 4.3 Auto/2WD V-6. I added a trans cooler because it is recommended for towing no matter what the GVW rating. If you buy a new Rado these days w/optional factory tow package it comes with a trans oil cooler, now why would that be ??? Think about it.........HEAT !

    Ryan.. what you were charged per quart for GM's special rearend tonic ??? We are not trying to ride you on this or get all worked up, just trying to educate you on the finer points of auto mechanics so as you don't get taken to the bank everytime GM says "ya gotta use OUR products or you will void the warranty" Learn from your elders my boy there's a lot of experience talking to ya on this forum, god I never thought I'd ever see myself as an elder....

    Uhhhhhh it's time for a Corona, now where's those damn limes.

    Ray T.
  • ryanbabryanbab Posts: 7,240
    $26 a quart

    Cost to the dealership is like $19 something a quart i heard

    Get this i had the gasket in my basement my moms like whats that gasket for? I was like for my truck she goes oh i could have gotten you one for free from work. Thanks mom

  • obyoneobyone Posts: 8,065
    When you mentioned Corona, the first thing that came to my mind was what I was thinking of cigar size and not beer until I read the lime part...hehe.

    Now I understand why Jed Clampett was a millionaire selling Texas crude for $26 a quart.

  • minikinminikin Posts: 389
    No 1/2 Chevy ton trucks come with oil coolers? Mine has one; part of the towing package. And I know it's there 'cause I've had the grille out; hard to miss. Also hard to figure how GM could void a warranty for an add-on cooler if it was done even half-assed right.
    -- Don
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