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Originally Posted by hmcoleap
The T-case fluid will definitely cook at those speeds for long periods of time; if you must drive at those speeds, you will want to stop every few hours to let the truck cool off. An external cooler for the t-case could help that situation.
Slow and steady might be a better idea... 65 with fewer stops would be better for the truck and get you there in close to the same time - better fuel economy, too! (Yes, I said fuel economy while talking about a Hummer!)
I would be less concerned about the geared hubs, myself.
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what does hummer spec the t case fluid at?
is it synthetic, etc? if its not maybe using a synthetic would help.
why does the tcase fluid cook in a hummer at those speeds, but not anything else?
maybe we can "back door" a higher safe highway speed.
more efficient intercooler? better intercooling and turbo piping? as stated previously, a tcase cooler?
depending on how important it is to run say 75mph rather than 65mph, there may be more than 1 way to skin the cat.