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Turned out to be my fuel line from the filter to the IP was kinked really bad. I got a replacement from NAPA and took it for a good test drive this weekend and all is well.

Well I want to thank everyone for their input and help. I know more about my transmission now. I have narrowed it down to it being a fuel issue from post advise and after driving it this past weekend. I plan on changing my filter and depending on how it looks I will go from there.

It's a GL truck. It probably needs the fuel filter replaced. I will be doing that after this much needed rain passes through. I haven't gotten around to changing all the filters yet so I guess that's a good place to start.

I'd like to know more about how that linkage effects the transmission. I'll have to go find that thread you had mentioned.

I don't think its the fuel because it shifts down to 4th and stays there, no matter if I manually shift, let off on the pedal, shower down on the pedal. I would think if it was the fuel or air filter it would not idle well. I could be wrong, that is why I posted it up here so I could get some...

I checked my fluid and it looks really thin. Not too sure if it has DEX 3 in it. I figure that its 30wt. I'm not too familiar with what DEX 3 looks and smells like. My plan is to do a fluid change and go to DEX 3. I got a couple of numbers to shops that work on Allison transmissions so I'm...

I'm not too sure but I plan on checking to find out.

I don't think I have that setup on mine.

This was a slight incline that it never had an issue with before. Once I was on a flat straight away it wouldn't shift up to 5th and stayed at 45 mph. I downshifted to 4th then tried to get it to go to 5th but it seemed it just didn't want to, I could downshift lower but it just didn't want to...

I was on my way to a car show this weekend in the 923 and it seemed the transmission wasn't shifting correctly on the top end. I started out fine, it was shifting great, but after it got up to temp and I was half way there I was going up a slight incline and it seemed that I started losing...