I'm on the fence about of getting rid of the vacuum pump and installing a TM. The reason is the boost drops to zero sometimes when I'm climbing a hill, that mostly happens when it's hot out.
The boost acts like this 3-4 while cruising on the highway and if I put a load on it, it will spike to 10 then drop down to 6-7 and sometimes cut out.
I have a Westers reflash, took off the egr, maf sensor, and the map sensor. Relocated the fsd and have the psi, TT, ET gauges. So installing a TM and removing the pump would give alittle more room for the intercooler I'm going to install soon.
I did a lot of reading this weekend about this and some say the TM is the best way to go. if I go this way does the vacuum pump control anything else other than what I have eliminated? If boost goes up what about more fuel? I just need a little more power when I tow sometimes. The truck has 175000 on the clock I want it to last as long as it can.
Also the trans is stock and seems ok I see Transgo is the way to go but which one what is the difference between the 2 the sk 4L80E and the 4L80E HD2? Should I install 1 of them?

You removed the MAP? I'm pretty sure the computer needs that to see boost...

ya...how does the engine not throw codes/decide boost with no MAP sensor...

When I had the reflash done I ask to get rid of the EGR MAP and MAF Westers said ok. I still have the wire pluged in but I don't know if it is doing anything. The EGR and MAF or off the engine..
Here is what he replied
"You could get rid of the MAF, the MAPsensor (one at the firewall), and of course the EGR solenoid.
Just say the word, and we'll build you a nice calibration for this truck.
FOr faster responses...email lwester@telusplanet.net

Lyndon"

That's just plain strange. The MAP and MAF sensors provide the data needed by the computer to calibrate fuel delivery. Without knowing how much boost or air volume is entering the engine, how can the PCM decide how much fuel to inject? I suspect they are using the TPS and RPM to determine how much fuel to inject. That's a very poor way to maximize engine operation. They can probably get good performance, but fuel mileage is bound to be worse.

If you remove the vacuum pump, it shouldn't be an issue. Nothing else needs it to run. All of the HVAC controls are electric on your model. I did it and had no issues.

After installing a TM, you may want to put a #9 resistor on your PMD. It is a small difference, but it helps. Major fuel calibrations need to be made in the PCM.

Jake

The "map sensor on the firewall" you have described is called a baro sensor i do believe, so you still have a MAP sensor on your intake... or you should as that is helps the computer determine how much fuel to dump in the cylinders...

So guys, don't have a cow lol...