Jump to content

Fresh Rebuild With Temp Problems

Austin Huff
 Share

Recommended Posts

Austin Huff New Member

Austin Huff

Posted
Posted

This may have been covered somewhere before and I’ve spent hours googling it, but I’m having what I think might be temperature troubles with my fresh rebuilt transmission. It’s a 2008 4.8 4x4 with the 4 speed and 3.42. My owners manual says normal operating temp is between 160-200. All summer long, it was nothing for me to hit 215-220 with no load. The shop had it in for a long time to try different things. They said they pulled the trans back apart and everything still looked new and they put another new torque converter in it, just in case. They said they added an additional trans cooler. They said they replaced a pump that pumps the trans fluid through the cooler and replaced the radiator. He eventually said he didn’t know what else to do to make sure everything ran cooler. He did all the work, except the rebuild, for free. That makes me think he was also worried that the temps on the transmission he rebuilt was too high. Now that he did all of that, it will run in the upper 190’s out on the road and go back over 200 (208 is the highest so far) at slow in town speeds and idling. The truck is lifted only 3 inches and has stock size all terrain LT tires, so I wouldn’t think that would cause much extra heat from working harder. I also don’t know if the only reason it’s now running in the 190’s instead of over 200 is because the temperature has dropped from the 90+ degree days down to the low 70’s. I also feel like the trans shouldn’t go over 200 from just sitting there idling. I prefer to drive with my windows down, but I have noticed it’ll stay a bit cooler, or cool down much faster at idle, if I turn the AC on and cause the fans to kick on. I planned to get slightly larger tires and/or maybe a small travel trailer and I’m worried that the temps will stay over 200 all the time with that, especially hot summer days. I don’t know if I should be worried about these temps or not. 

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing

  • Latest Articles

  • Posts

    • asilverblazer
      2015 Sierra Denali L86 cyl 5 misfire at idle

      By asilverblazer · Posted

      Compression test? Weird noises? Fuel trims?
    • asilverblazer
      Wow I'm in a pickle. (Broke down truck) and a story.

      By asilverblazer · Posted

      I suspect at some point in the near future, the hardware will be free and you pay a subscription to access the vehicle - alldata style.
    • parthery
      BAK MX4 EZ-Lift Install and Review

      By parthery · Posted

      I've been eyeing an upgrade to my tonneau cover for a bit now.  Intrigued by the BAK MX4 EZ-Lift with the torsion spring and went for the upgrade.  Thoughts and musings during unpacking, install and a few days of usage.   Once my order went into Realtruck, it took about 4 days to ship.  Unfortunately, FedEx Ground destroyed the box and contents and it was unusable upon receipt.  To Realtruck's credit, one email with pictures and an RMA was sent to me to send the first one back, and another unit was shipped out.  It arrived 3 days later, unscathed.   I opened the box and it looked like every other BAK MX4.   Biggest differences are the rails and retaining clamps, and of course the spring attached to the cover itself.     NOTE - if you are upgrading from a MX4 to the EZ-Lift, you will have to replace the rails.  The EZ-Lift rails have a notch cut in them to allow the new style retaining clamps to fit properly.  The new retaining clamps also have 2 knobs/carriage bolts and there are two tracks underneath the front panel. The strap clips are mildly different (more like the Undercover Flex clamps) in that the screws go in from the underside.  Personally I prefer these over the BAK clamps that use the nutserts that are a nuisance to install.  The remainder of the parts in the box (drain tubes, rail clamps, and bumper pads) are standard issue BAK.     I did not replace my front bed seal at the time because it seemed to be in decent shape.   BAK recommends shims on the GM trucks unless you place the clamps on the flanges about 1/3 of the way in from both the front and rear of the bed.  I shimmed the front and the middle, and initially placed the clamps equidistant.  This also turned out to be a mistake, because when I set the cover in place, the new style retaining clamps wouldn't clear the front clamp.   New style clamp inserted in the track:     And the issue which occurred because the front rail clamp was too far forward:     Once I removed the shim from the front of the bed, and slid the clamp back to the front flange, everything cleared fine.     The cover set on the rails without issue and I installed the strap clamps.  After I completed my adjustments, I pulled the pin to activate the torsion spring.  Mistake #3 on my part.  PULL THE PIN AS THE VERY VERY VERY LAST STEP!  The reason is, once you pull the pin, the torsion spring is activated.  If you have to loosen the front clamps and adjust the cover, the front panel will - by virtue of the spring, refuse to lay down.  The only way to get it to lay down so you can reinstall and tighten the clamps is to fully open the panel against the back of the cab, which will then allow the front panel of the cover to lay down and be tightened.  Not a big deal unless you haven't installed the foam pads yet (typically the last step) because minus the foam pads, you will need to place something between the frame of the cover and the back window so it doesn't get scratched.  The next time I install one I will install the foam pads before I pull the pin and activate the spring.   After using it for a few days:   The spring assist is great.  You literally can open it with one hand.  My shoulders aren't getting any younger and this was part of my motivation to swap out. The second panel latches and unlatches itself as you open and close the cover.  Neat in concept, however it took me a minute to get used to closing the cover and not hearing the "latching" sound that would tell me it was locked in place. The paddle handles are a huge upgrade and I wouldn't be surprised to see them become the standard across the Realtruck line.  They effectively eliminate the concern that a thief could coat hanger the cover open and get to the contents in the bed. I'm not sure why the very front panel on my cover has a different finish from the other 3 panels.  I have a request into Realtruck to find out if mine was not manufactured properly or if it was by design.   All in all I'm pleased.  Same level of protection, looks good, keeps stuff mostly dry (they all leak around the tailgate) and easy to install.
    • KARNUT
      PF63 Oil Filters Going Away?

      By KARNUT · Posted

      Thanks not an answer 
    • Tyler Gibbs
      PF63 Oil Filters Going Away?

      By Tyler Gibbs · Posted

      /facepalm

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...