Does this make sense?

[cleatus12r]

No biggie. Typically we don't change the tire size stuff for anything smaller than 33" tires since there is no speedometer correction in the chip.

[wood4heat]

I have seen some programmers that defuel on shifts. Seems like that would save a lot of wear and tear on the drive train, is that possible with a PHP chip on our trucks?

[cleatus12r]

The factory programming has a torque reduction strategy during the shifts. We keep this in place on the towing and daily driving tunes. The performance and race tunes do not have this feature...especially on the 02-03 trucks because of shifting concerns due to transmission hardware changes.

[wood4heat]

Originally Posted by cleatus12r

The performance and race tunes do not have this feature...especially on the 02-03 trucks because of shifting concerns due to transmission hardware changes.

Whenever you have time I would love to know what you meant by this. Especially since I have an '03. Should I be concerned or pay special attention to anything?

[cleatus12r]

Originally Posted by wood4heat

Whenever you have time I would love to know what you meant by this. Especially since I have an '03. Should I be concerned or pay special attention to anything?

The valve body spacer on the 02 and 03 trucks is different than the one on earlier trucks so it's easy to get a long, drawn-out shift on higher horsepower programs due to restricted flow problems. Sometimes, you'll get a flare and a bump too.

[wood4heat]

Originally Posted by cleatus12r

The valve body spacer on the 02 and 03 trucks is different than the one on earlier trucks so it's easy to get a long, drawn-out shift on higher horsepower programs due to restricted flow problems. Sometimes, you'll get a flare and a bump too.

I'm trying not to take up too much of your time here but is that what I could be feeling on the 2-3 shift occasionally? It doesn’t always happen but sometimes it feels like the clutch disengages just before the shift allowing the rpm’s to build momentarily and then hits firmly into third. Seems more prominent when there is a load on the truck. The truck continues to accelerate through it but the tach and speedo don't seem 100% matched up. It's so minor I not exactly sure it's not just my imagination but after the info you gave in an earlier post I thought it was possibly the stock torque converter clutch catching up with the modified valve body. I was hoping if there was something going on it would be corrected with your tuning.

Could this cause longevity problems with the higher hp tunes and is there something I could do to improve it?

Also thanks for the time and info you’re sharing. I really appreciate it.

[wood4heat]

I've had a hectic couple of weeks but did receive my chip. Almost a week later I finally got around to installing it. Only went for a short drive but WOW! The 80hp DD adds a nice bit of pep and the 120hp race is scary. It's such a drastic increase I don't trust the tranny to hold up to it. I was honestly afraid to go WOT on it, especially through the shifts.

Definitely happy with the tunes but might need some time to build my confidence in the truck.