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Tranny Fluid Change Completed

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intheburbs Enthusiast

intheburbs

Posted
Posted

You got a tranny cooler on that thing?

 

Of course; all 2500s have transmission coolers. But we were doing some slow, frame scraping fourwheeling in Canyonlands and the ambient temperature was over 100°, and I was also pulling the trailer on I-70 up Vail Pass and through the Eisenhower tunnel. A friend of mine is a transmission engineer at GM, and I picked his brain about temperatures and fluids. The limiting factor on transmisison temperatures is the fluid. Dexron VI can go up to 270° before any significant thermal breakdown begins. I wasn't worried.

 

My gauges as we approached the Eisenhower tunnel (pardon the blurriness - my wife was reaching over to take the picture):

20140713_164118_zpsb3c83ab0.jpg

 

2nd gear, 4000 RPM, 40 MPH, engine at ~220°, transmission at 230°. For 6-7 miles at a time. In my opinion, there's not much more abuse you can heap on a vehicle than the Eisenhower tunnel. 6-7% grades that go on for miles, altitude over 11,000 feet so you're losing well over 20% of your power in a normally-aspirated vehicle, and engine revs much higher than normal. The throttle wasn't floored, but it was close. Probably 3/4.

CapitalTruck Senior Enthusiast

CapitalTruck

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Posted

Man, I was just out there this past summer myself. You aren't kidding about noticeable power loss. I had a fully loaded (4 people+1 weeks luggage each) 1500 ext cab with 4.8 V8. Went up through Vail and then cut down into Moab, etc. Some of the most beautiful area I've ever seen. But yeah, its a screamer for trucks! You get into Capitol Reef at all?

intheburbs Enthusiast

intheburbs

Posted
Posted

No. We did Gemini Bridges and White Rim. We passed the turnoff for Metal Masher, but figured it probably wasn't a good idea in a Suburban. :noway:

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