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Chevrolet transmissions & drivetrains repair questions and answers

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  • wdrakek
    wdrakek - 1999 Chevrolet Silverado 1500 - Transmissions & Drivetrains - 12/5/2013
    Where is the transmission test port on a 99 Chevy Silverado z71 located for the use of a transmission temperature sensor
    I'm hooking up an aftermarket transmission temperature gauge and need somewhere to screw in the sensor included with the kit
    0 answer
  • kevin_tsa
    kevin_tsa - 2006 Chevrolet Malibu - Transmissions & Drivetrains - 12/3/2013
    Why is my car having trouble accelerating at speeds over 40mph?
    Low speeds seem to be normal. RPM's do not seem to be in sync on hwy. It will get up to speed, but takes longer once the vehicle is at 45mph plus. The first time this was noticed was yesterday, after the car had been sitting for nearly a month. It was raining, ...
    • CVO
      10/16/2013 CVO
      The check engine light doesn't have to be ON to store a fault code.

      Check the vehicle for fault codes to see if there are any sensors were involved to the malfunction of the engine.

      1.Local auto parts stores such as Autozone ( not in California) or Advance Auto parts will scan and retrieve any diagnostic trouble codes ( dtc ) stored in the powertrain control module for free of charge..

      2. has the code reader for less than $16.25 dollars + shipping
      Autel MaxiScan MS300 CAN Diagnostic Scan Tool for OBDII Vehicles

      3.Re-post the dtc's in here " answer question " for further assistance.

      Note: we need the dtc's to identify the sensor, there are a dozen different sensors to operate the car.

      Visit this site and see all the different sensors.
    • kevin_tsa
      11/26/2013 kevin_tsa
      dtc for this read is 90420.
      11/26/2013 CVO
      P0420 Catalyst System Efficiency Below Threshold (Bank 1)
      Check for exhaust leaks at the manifold, pipes, catalytic converter. Repair as required. inspect the downstream heated oxygen sensor (HO2S), replace it if necessary.
      Replace the catalytic converter, it was clogged.
      If you need to replace the catalytic converter that you replace it with an OEM unit. Second choice would be a high-quality replacement part.
    • kevin_tsa
      12/2/2013 kevin_tsa
      What would the estimated labor time be on replacing the catalytic converter?
      12/2/2013 CVO
      See this for an Auto repair estimates
    • kevin_tsa
      12/3/2013 kevin_tsa
      I am being told by the repair shop that the catalytic converter needs replaced. However, they are saying that I must use the GM cat or else my check engine light will stay on if I use any other brand. This is because all GM models comply with California law. I can't see spending 1500.00 on a job that could easily be done for 500.00 or less. Can I use a cat other than GM and be able to reset the engine light?
    • HouseCallAuto
      12/3/2013 HouseCallAuto
      I would not hesitate to use a Walker 16469 replacement catalytic converter or Dorman 674889 which seems lower in price, which in this application is actually the exhaust manifold combined with an integral converter. I see these online cheap enough. either will work fine. $500 or less at a shop I doubt. Pay $275 to $375 and do it yourself and then it comes out under $500. if a shop does it there will be normal markup of parts (that is how this business works, perfectly ok) so parts (dorman for example) will cost customer about 30% more than their cost (estimated) and labor will be about 2 hours. maybe you will come in under $750.
      12/3/2013 CVO
      Maitre HCA. Merci.
  • AutoMD Member
    AutoMD Member - 2005 Chevrolet Silverado 1500 - Transmissions & Drivetrains - 12/2/2013
    Any recalls on my truck ?
    My truck has only 51,000 miles on it. I bought it brand new. I have never receieved any Recall Notices through the mail. I am seeing alot of TBS listed for it. Does the dealer repair the TBS as a recall? Thank you
  • AutoMD Member
    AutoMD Member - 2007 Chevrolet HHR - Transmissions & Drivetrains - 12/2/2013
    I am working on the drive train I need to know how to remove output shaft (short) and install seal kit
    It has 91,000 miles on it I have removed the cv joint
    0 answer
  • Rick
    Rick - 2006 Chevrolet Tahoe - Transmissions & Drivetrains - 11/30/2013
    Transfer Case Output Shaft Seal Leak
    We have replaced the rear output shaft seal 3 times now and it is still leaking. Could this be caused by the bushing/bearing being damaged. There is no play in the rear drive shaft when it is installed, there are no nicks/splinters on the transfer case shaft ...
    • HouseCallAuto
      11/26/2013 HouseCallAuto
      Maybe when you removed the first seal you gouged the aluminum with the screwdriver blade where the metal wall of the seal has to make a seal against? Beyond that...I'm out on this one.
      11/26/2013 Rick
      When we replaced the seal the last time we checked the housing and saw and felt no nicks/gauges. Thank you for trying.
      11/27/2013 Rick
      An additional note, would the bushing keep oil from entering the area where the rear output shaft seal is?
    • HouseCallAuto
      11/27/2013 HouseCallAuto
      I think your best strategy now is to stop at a dunkin donuts and get 4 large coffees and a dozen donuts and then go immediately to a transmission only repair shop with the questions that neither you or I know for certain. Many of these shops actually do transfer case rebuilds themselves and they will be familiar. As a former shop owner for 25 years, coffee and donuts breaks down any barriers to receive good advice from professionals.
    • Maize
      11/27/2013 Maize
      Is it leaking from the rubber seal or from the outside of the seal where it's pressed into the housing? (If it's the seal itself there WILL be oil on the rubber - if no oil on the rubber then it's definitely leaking from the housing). If the housing is leaking and if it's not obviously cracked or otherwise damaged, try putting silicone sealant around the outside metal of the seal before installing it, being careful not to get any on the rubber seal itself, of course. If it's the seal that's leaking; the causes are: Improper installation, drive shaft out of balance, bad u-joints (causing out-of-balance), or internal transfer case bearing failure (hopefully not this!). Unless you can feel a vibration in the vehicle at highway speeds, out-of-balance is probably not the problem. Are you SURE you're not damaging the seal at installation? It's very easy to do on that vehicle! BTW - the bushing is NOT designed to keep oil out of the area; on the contrary, it's designed to allow it IN. The bushing is not your problem. If it was THAT badly worn; you would feel play in the installed driveshaft.
    • Rick
      11/30/2013 Rick
      Wanted to say thank you to every one. We went out and bought a GM rear drive shaft seal and found out that there is a big difference between GM and National brand from Advanced Auto. It now is not leaking and has a much tighter seal around the drive shaft which is where it was leaking from. Hopefully this will help someone else in the future.
      11/30/2013 HouseCallAuto
      Drop National a note and print this thread and send it to them. Maybe they will send you a credit of some kind......and maybe they will fix the defective seal design.
    • HouseCallAuto
      11/30/2013 HouseCallAuto
      Wow, interesting. I guess I would have done the same thing after 3 seal replacements and knowing that the shaft and case was OK. Good work!
  • AutoMD Member
    AutoMD Member - 2001 Chevrolet Blazer - Transmissions & Drivetrains - 11/25/2013
    Blazer 4WD not working!
    Hello everyone. My 01 Blazer's 4WD is not working. When I push the 4WD button I can hear a motor down by the transfer case making the sound like it's engaging but it never does. The light on the switch in the cab shows that it is engaged but its not. I already ...
    • HouseCallAuto
      11/25/2013 HouseCallAuto
      Most times the encoder motor is the cause. The 4wd transfer case control module is able to set fault codes but you need a reader that can access them. Knowing the fault code makes diagnosis simple,
  • bobbimorgan88
    bobbimorgan88 - 1999 Chevrolet Blazer - Transmissions & Drivetrains - 11/23/2013
    Could i need to place my front right hub ?
    I"m hearing a "thud" kind of noise coming from right front tire
    • HouseCallAuto
      11/23/2013 HouseCallAuto
      No a thud is not typical of a bad wheel hub, this will need to be diagnosed by looking at the suspension and steering by someone that is a mechanic. Thud is a vague term, kinda takes me nowhere as far as advice.
  • Rick
    Rick - 2006 Chevrolet Tahoe - Transmissions & Drivetrains - 11/23/2013
    The output shaft seal is leaking from the transfer case
    We have replaced the seal two times and it is still leaking. Where to go from here? Thank you
    • HouseCallAuto
      11/22/2013 HouseCallAuto
      Then the shaft has a rough spot that makes contact with the seal (damages the new seal) or the output shaft bushing is worn and allowing too much shaft movement beyond the working diameter of the seal. Changing the bushing I know little about as that is a sub-assembly I usually leave to a tranny shop or someone specifically familiar with disassembling a transfer case.
      11/23/2013 Rick
      The shaft has no rough spots, when we had it out we made sure of that. There is no play in the output shaft prior to replacing the seal. Which is why we don't think it is the bushing. Any other suggestions?
    • HouseCallAuto
      11/23/2013 HouseCallAuto
      Check the vent hose on the TC. Maybe the unit is building up positive pressure and helping to push out fluid. Make sure the correct fluid was put in and not overfilled. It is either Dexron III trans fluid iof it has Stabilitrak and if it has the other which is just 4 wheel drive (automatic transfer case) then it takes Auto-Trak fluid, GM part # 12378508
      11/25/2013 Rick
      Checked the vent hose, replaced the seal for the third time and is still leaking.
      11/25/2013 HouseCallAuto
      incorrect seal part number used maybe? Confirm
      11/26/2013 Rick
      not the incorrect seal, I have double and triple checked on this. Thank you for trying, any other suggestions? I really don't want to pull the transfer case and pull it all apart if I don't have to.
  • Rick
    Rick - 2006 Chevrolet Tahoe - Transmissions & Drivetrains - 11/22/2013
    I have a leak on transfercase,rear seal.I have replaced seal and it still leaks. there is no slop or movement in driveli
    The transfer case output shaft seal is leaking, we have replaced the seal two times already and are not having any luck. Please assist!
    0 answer
  • AutoMD Member
    AutoMD Member - 2002 Chevrolet Trailblazer - Transmissions & Drivetrains - 11/21/2013
    Transmission fluid leaking from cooler line connections. Is there an external sealant that I can use to seal the leak?
    The connectors are old and are not moving, so I can't get them off to replace at this time. I want to buy some time to get up the money to take it to the auto shop, but would like to stop the leaking if I could - at least with a temporary fix like a metal sealant ...
    • HouseCallAuto
      11/21/2013 HouseCallAuto
      No don't bother trying because it will not work. 37 years in this business, I know.
  • DEN
    DEN - 2001 Chevrolet S10 - Transmissions & Drivetrains - 11/20/2013
    My 2001 chevy s10 6cy 4.3 is stuck in 4wd what is the problem and how do you fix
    • Paulo
      11/20/2013 Paulo
      4x4 high or low? May need to switch to neutral while stopped, then try again.
    • HouseCallAuto
      11/20/2013 HouseCallAuto
      The fix for this "most times" is a new transfer case, however, it could be a stuck encoder motor on the outside of the transfer case.
  • johnsmith
    johnsmith - 1997 Chevrolet S10 - Transmissions & Drivetrains - 11/20/2013
    I just recently had a seal installed in my front differential, and now the 4wd won't engage.
    I recently had a seal installed on the front differential on my 97 s10 pu and now 4wd won't engage in 4hi. The light comes on but it wont engage. What are some of things that could result in this problem? The dash switch lights up and sounds like it switches. I ...
    • Paulo
      11/20/2013 Paulo
      Possible cause: Electric transfer case solenoid under car unplugged.
  • AutoMD Member
    AutoMD Member - 2005 Chevrolet Suburban 1500 - Transmissions & Drivetrains - 11/12/2013
    When trying to accelerate the vehicle dogs out and wont increase speed or rpm until I release pedal and go again...
    150000 miles Had it in to professional auto body whose diagnostic tool shorted out every time it happened so they are unable to give me definite answer.
    • HouseCallAuto
      11/12/2013 HouseCallAuto
      Obtain your own OBD code reader from amazon for $17 with shipping. Takes minutes to read fault codes. Update the post with the code number.
  • AutoMD Member
    AutoMD Member - 1997 Chevrolet Camaro - Transmissions & Drivetrains - 11/9/2013
    Transmission is stuck in second gear
    Transmission is stuck in second gear and I do not know how to fix it. How do I get it out of second gear?
    0 answer
  • AutoMD Member
    AutoMD Member - 2007 Chevrolet Avalanche - Transmissions & Drivetrains - 11/4/2013
    Why would the engine suddenly idle rough, and transmission shift hard from 1-2, and 2-3?
    Vehicle has 79,000mi, had oil change and fresh gas the night before. Next morning while sitting idling after about a 45 mile drive, it started running rough, the Check engine light came on, followed by the 'Stabilitrac Off' indicator, followed by the 'Service ...
    • Calderons Automotive
      First get the check engine light scanned. See what the codes are. Autozone will scan it for free.
      Calderons Automotive
      11/4/2013 AutoMD Member
      Thanks, couldn't wait as it turns out. It ended up being 2 leaking fuel injectors.
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