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  1. Tim907356

    'Service Suspension System', 2010 Yukon Denali

    So I just changed out the rear shocks, after discovering the perforated air bags. My compressor would run whenever it was out of level, but it never threw a code/alert. Now, with the new shocks, they were actually working, leveling the load when we put weight on the rear. However now, maybe...
  2. Tim907356

    Towing a trailer with automatic leveling system

    I'm in a similar situation: 2010 Yukon XL Denali. I've been pulling a 4100# Travel Trailer for 6yrs. or so, and traded for a 6400# T.T., with a ~700# tongue weight. We drove it home for 2hrs. yesterday with the rear suspension waaaaay-low. The load leveling springs were undoubtedly too...
  3. Tim907356

    Transmission Stumble

    It's a 6L80E on the 2010.
  4. Tim907356

    Transmission Stumble

    This came from the LS-1Tech forum:
  5. Tim907356

    Transmission Stumble

    This is a 2010; to my knowledge there's no internal thermostat. It certainly doesn't work if it's there, as it ran at 80-95deg. on the last trip.
  6. Tim907356

    Transmission Stumble

    Bingo. The local transmission shop concurs as well. The thermostat is installed and ready for the 405mi. trek to Cincinnati tomorrow morning... And, which one of you is picking me up along the highway when it blows? ;) JK! Thanks for the help! Good to have experts around. Edit - it comes...
  7. Tim907356

    Transmission Stumble

    Well, after all the overheating was solved (a while ago,,,I know!) I just got back from Cincinatti, where the temps were 0-10deg. I came back during that snow event that shut down I-95, but cleanly, at least, down I-75. When I did the transmission cooler installation, I did not put the...
  8. Tim907356

    Weird smell when A/C is turned on

    I can see a Dorito stuck in my duct.
  9. Tim907356

    Aux Trans Cooler with Fan OPTIONS

    That's why we upgraded to the Denali aslo. We pull a 24' now, and want to upgrade to a ~30', probably around 9k. I was surprised to find issues with the tranny, as the 6sp was recommended for better towing than the 4sp in my 2004 Yukon XL, 5.3L. We put 20K worth of towing miles on that...
  10. Tim907356

    Tru-Cool Max 40k Transmission Cooler

    I hope you don't mind a post, but I just installed a TC 30K cooler, because it fit better between the beams, behind the lower grill. I left the rad. and external coolers in place, and plumbed it in series with the hose they provided; just cut the factory aluminum line and clamped the hose to...
  11. Tim907356

    Aux Trans Cooler with Fan OPTIONS

    I don’t have a problem with the hardware; the online shop I bought from was/is a nightmare; Five Star Transmissions. They messed up the order with flare! I took it to the shop to ha e diagnostics done and a filter change after the cooler install. They said the torque converter is going out. It...
  12. Tim907356

    Aux Trans Cooler with Fan OPTIONS

    I'll look at Circle D, but I'd rather avoid shared liability....no one will own anything if something goes wrong! True, if you consider that, "Top line out of the radiator is return to trans." omits that it flows through the cooler before the trans., which was the gist of my question.
  13. Tim907356

    Aux Trans Cooler with Fan OPTIONS

    I was hoping to keep it in the 130's, without towing. I know it'll increase on a heavy haul. It previously ran ~170-175F, but then up to 240 in the hills, with a 5000# trailer behind. I just got it out of service for a filter & fluid change. From the symptoms, the guy said the torque...
  14. Tim907356

    Transmission Stumble

    After the cooler install, I took it in for tranny service; change fluid/filter, and diagnosis. He said it all checked out fine. But then after some direct questions about the stumble, and overheating, he said the torque converter was going out; a common problem (at 130k??). He asked if I felt...
  15. Tim907356

    Aux Trans Cooler with Fan OPTIONS

    Yeah, this is uncanny timing. And good to see much of the same thinking on cooler/cooling mods. I had intended a TC 40k cooler, but the 30k barely fit between the chassis beams, so I'm glad I got what I got. I don't need a front tag in SC, so if more cooling is needed, I'll probably put a...
  16. Tim907356

    Aux Trans Cooler with Fan OPTIONS

    Well we are on parallel paths my friend! I have another thread on the same subject so I won't bore with the details found there: "Transmission Stumble". I am installing a Tru-Cool 30k auxiliary cooler inline with factory unit, behind the lower fascia. It will be passive though; no fans...
  17. Tim907356

    Transmission Stumble

    How do you know which transmission cooler line is the send line, and which is the return line???
  18. Tim907356

    Transmission Stumble

    Just an update; here's some pics of the installation. I cut through the plastic fascia behind the lower grill, and the lower bumper extension to create airflow. The cooler (tru cool 30k) mounted behind that. It's not plumbed in yet, as I didn't have any trans. fluid, but will be getting some...
  19. Tim907356

    Transmission Stumble

    I just returned from MD to SC: 550mi., not towing, and the stumbling condition did not change for better or worse. Max temp was 172. I have a tm cooler coming so I’ll prob do the cooler, fluid and filter at the same time. I already flushed and replaced coolant. I’m thinking about mounting the...
  20. Tim907356

    Transmission Stumble

    Yes. It shifted earlier and stayed out of 6th. I used it in the hills, but it didn’t change the overheating situations with either the engine or tranny.
  21. Tim907356

    Transmission Stumble

    No tech-2 but I’ll take it in.
  22. Tim907356

    Transmission Stumble

    It has the trans cooler, but the last time we pulled through the mountains of NC, it overheated to 240(max). The engine also overheated when this occurred. I’ve flushed the coolant, and have ordered a tru cool 40000, but it hasn’t arrived yet. I doubt the tranny has been serviced. Is that just a...
  23. Tim907356

    Transmission Stumble

    My vehicle is a 2010 Yukon XL Denali with 129k miles. I think I'm the first one to tow with it, but we bought it used from a street lot, so don't know anything about its history. The hitch looked new when we first hooked up our 5000 lb. travel trailer. It's only been towed 3 times. I'm on a...
  24. Tim907356

    Heatin/overheating??!

    Is there a thermostat in the trans. cooler circuit already, on 2010 Yukon Denali? The tru-cool units warn not to use them below 32F without one. Also, can you mount them upside down, with the fittings facing up?
  25. Tim907356

    Heatin/overheating??!

    Well on the two fronts, the moog kit came in and I changed links and bushings this weekend. I was a little disappointed with the links. It was the same basic design with even lighter plastic parts! The failure was the interior metal rod though, so at least it’s done and not knocking around...

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