retraite wrote:
booster wrote:
... The Chevies with the 6 speeds appear to not have the overheating of trans and engine that the 4 speed versions are prone to.
We have a 2008 PW Lexor, so the same Chevrolet base unit as the 2010 RT 190 above. Ours has the 6L engine and the four speed transmission.
We've been towing an enclosed trailer - single axle, 3,5000 lb. GVWR - with no "overheating" issues. Ever. We did install an auxiliary ATF cooler complete with thermostatic fans. I also installed an ATF temperature gauge on the A pillar so I could keep an eye on the ATF temps, especially in the mountains.
A ScanGauge II lets me keep an eye on other values.
All that said, I wouldn't want to tow with the 4.8L engine, but, I'm fine with our combination. Both the 6L and the four speed are tried and true over a lot of miles by lots of users.
That is actually pretty surprising as most will overheat in the mountains even without a trailer. From what I have been able to find out, about the only way they don't have heat issues is if you have rpm high enough to get the torque converter to lockup, as it stay unlocked at most lower rpm/speeds. To have converter to lock in ours with 4.10 gears, I think you have 3.73, at full throttle, you have to be going 50mph in second gear, 68mph in third gear, and 87mph in fourth gear according to a copy of the PCM programming I made with an aftermarket tuner.