Two-fold question - I did a little searching online, and some people have had similar experiences with this, but they had other symptoms- missing a gear, or hard shifting, things ...

starspangled6.0 · by **starspangled6.0** [OP] » Jan 19 2012, 3:51am

nitro wrote:It's good to hear that your fluid was off. But from the sound of it, it may be to late. If i understand your post right you said it was fine in the cooler weather, but got worse after it warmed up outside today. Sounds like the trans is slipping. So when it warms up the clutchs are slipping and not allowing it to go into overdrive. 4.10 gears wont have any effect on what your explaining is wrong.
So first question is do you have a tranny temp gauge.
Second if so what does it read when its not going into overdrive.
Third try putting it in to third gear and drive around. You should be able to watch the rpm's drop by 100 or so when you get to cruising speed between 30-40. That will tell you if the TQ is locking up.
GM does not have clutch bands to adjust. Thats because they can build a trans right the first time unlike ford and dodge.
Hope this helps you.

I did a little searching online, and some people have had similar experiences with this, but they had other symptoms- missing a gear, or hard shifting, things like that. My problem is there aren't any other problems- it shifts like a dream, and there aren't any tranny-related codes. The tranny temp gauge doesn't move much at all on the freeway, regardless of speed. The only time (in the winter) that I can get it up to 190-200* is in hard city driving. I think it's obvious that something's wrong, but I don't want to hand it off to a mechanic who charges $100\hour to diagnose it all day long. Hopefully I'll find something soon... thankfully, there aren't any other issues with it (right now, at least :shock:

).

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starspangled6.0 · by **starspangled6.0** [OP] » Jan 19 2012, 11:38pm

I checked the truck manual today, and it said one of the reasons the CEL will flash and then go off is in case of a misfire. I did pull a p0300 code once, which is for a random misfire. Any connection?

Goldfish · by **Goldfish** » Jan 19 2012, 11:52pm

In my S-10 I had back when, the MAF was dirty from an aftermarket air intake being greased too much and getting the MAF gooped. Maybe try cleaning that (carefully, they are sensative and small wired) and see if that does anything? I thought my tranny was going out because of it. It would mis-shift, slip, and do all sorts of funny things.

Now, that being said, on my 99 Silvy I'm having weird trans shifting things going on as well. If I WOT it, it slips at the top of 2nd gear, and when I'm going easy with it, when it tries to go into overdrive the RPMs flutter (that's the best way I can describe it, the RPMs bounce around like it can't pick a gear or wont stick into the next gear). It also had problems staying in overdrive when I was towing my boat or my dad's snowmobile (I know, I know, towing with overdrive, but it's a tiny 14 aluminum boat and a single snowmobile on a small trailer).

starspangled6.0 · by **starspangled6.0** [OP] » Jan 19 2012, 11:59pm

Hmmm... as far as I can remember, it did fine, even when towing my 2000# trailer at 70 MPH this summer. In August, I put the programmer on, and after that, I can't remember it ever being the same. I have recently cleaned and re-oiled the air filter, as well as the MAF and throttle body, but I haven't had any other issues regarding a bad cleaning job. I took the programmer off, and it has been a little bit better, but the problem still exists.

I had the transmission flushed and filled with AMSOIL fuel-efficient ATF in the fall; would that have anything to do with it? I doubt it, but I'm just trying to check everything here.

Goldfish · by **Goldfish** » Jan 20 2012, 12:01am

You also have the HD, mine is the normal one. What trans is in the normal one, anyways?

starspangled6.0 · by **starspangled6.0** [OP] » Jan 20 2012, 12:10am

4L60E or 4L65E. I've got the 4L80E.

starspangled6.0 · by **starspangled6.0** [OP] » Jan 21 2012, 3:01am

Another strange twist... Yesterday, I bled off a little more of the ATF, since it was overfilled. I didn't have time to test it out, but today I took the truck and plow down the freeway, up to 65 MPH. It held the speed just fine, no issues with the TC at all. Going down, the truck was just getting warm, and the tranny temp needle barely moved off of 100. Going back, I had come from a plowing job, so the tranny temps were more like 160* (15* outside air temp), and again, it held the speeds just fine.

nitro · by **nitro** » Jan 21 2012, 11:45pm

I'm at a lose with this one.

starspangled6.0 · by **starspangled6.0** [OP] » Jan 22 2012, 12:15am

So am I! Nothing really makes sense. Since I can't find anything broken, I can't fix anything, so we'll just wait and see...

Scooter06 · by **Scooter06** » Jan 22 2012, 12:19am

You could always fix it til it is broke, then you'll know for sure what's wrong

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