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Thanks! My initial contact with the dealer is that there will be at least "some" help on the cost. It goes in the middle of next week - we'll see what they say and go from there. I may end up calling GM, myself, as well.

Excellent point!!! Thanks again! It'll probably take me a week or so to get this done, but I'll be sure to post back when I find out.

Great memory, Ben! Sure enough, it was exactly as stated above. I couldn't get a sample since there was no drain plug and I wasn't really dressed for dropping a corner of the pan. But, I drove it around a bit and then looked at the stick again. I could definitely see a slightly milky/frothy...

I'll stop by her house on the way home today and drain some fluid out into a clear jar. I'll drive it around first so it mixes up well and I'm not just draining ATF since the water will float on top.

Mike, that's a good point! Ben - that's very interesting. I'll have to have a better look at the fluid. One thing did strike me as odd when I checked the level - and didn't think of it till now - the fluid was actually overfull and it was the pinkest tranny fluid I have ever seen. Was what...

It's got the inline-6. OK, so the plan of attack... -Pick up some Electronic Cleaner and clean the MAF (I assume something like Brake Cleaner would be bad?) -Test drive -If problem persists, check for hidden codes. I'll get that done over the course of the coming week and report back. If...

My grandmother has a 2005 GMC envoy (I apologize, I don't know the specific automatic tranny). It has approximately 15,000 miles on it. I borrowed it for a few days and noticed that the torque converter is acting up. Between 50mph and 70mph it is constantly "hunting" to lock-up. Sometimes...

You'd need to get down the equivalent of about 3.73 gears as that's right about where I turn. Whether you do that with an actual gear change or with tires, like Buddy mentioned, you are going to have a very noticeable drop in your towing power and the truck's "get and go".

Yeah, it is fun doing some math. In fact, I started playing with taking a given RPM and tire diameter and converting that to MPH. First factoring in gear and axle ratio to get tire RPM. Then factoring in tire radius and eventually converting from inches/minute to miles/hour. Granted, it's...

Would these calculators be of any help? Reading this thread just got me wondering and I started googling. Convert metric tire size to inches: http://www.4lo.com/calc/gearmetric.htm Then, use the next calculator... Find your RPM (at various speeds) with different tire sizes...

Ooops - let me back track a bit (in regards to my first sentence in post #43). I misread post #42 to mean that the RPM's jump not in relation to speed - my bad on that - reading too fast, I guess. Yes, if the RPM's climb proportionally to speed, it is locked. If they jump a few hundred...

OK, then you can confidently say the TC isn't locking as that's a physical indication. However, this also means that I'm out of the conversation as the others can offer better expertise than I can! :) I guess you're back to things like the brake switch and sticky solenoids? The only other...

Just for the record... I was wrong above... When at highway speeds and TC is locked, letting off the throttle drops RPM's to about 1,000, BUT tapping the brake DOES NOT drop the RPM's to idle. Dropping to idle (from tapping brakes) only happens when I'm going slower with the TC already...

Good point. BMX - do you have stock programming?

I'll try that on the way home... but I thought the "tapping the brake pedal" thing only worked when you were off the throttle completely? Meaning when you let off the throttle, the RPM's go to about 1,000 - then tap the brake and they go to idle? That's interesting that yours won't unlock...

That sounds about right - I don't think I've ever been able to get to actually lock (extremely light throttle) until about 49/50 - but sometimes I've noticed it stays locked as I slow down (but still under slight throttle) to around 48 (could be 46). I was wondering about the big gears, too -...

See post #15 - you don't have to "feel" anything for that one. Keep your foot into the pedal, just goose it a little - don't get off it and then back into it.

Another quick way to see if you are locked up: Around 60mph (to insure you should be locked up) and light throttle input (cruising on level ground)... "goose" the throttle about 1/2". You should see NO increase in RPM. RPM should only increase as your speed increases. I feel the lockup when...

I'm not 100% positive on this (maybe someone else can verify)... But, I think there's a switch on the brake pedal that if it fails, will prevent the cruise from working. Might be worth while checking that, too. But, that's probably in that wiring schematic, too.

Hmmm... That's both interesting and saddening at the same time. I wonder if there are any biodiesel retailers near me - I'm going to look for that. The shop put in a new lift pump as the one of the truck fried while they were testing. I was just about ready to buy a Walbro, too. Now, I...