ok so when you look at the tables in the PCM Via the DHP or the HP tuners, there are 2 tables\

so the 00+ dont have a Performance shift option like the earlier Bonnevilles...you need to Tuner to "Turn on" the Performance shift button Via the Tuner,.......although right now the the HP Tuners doesnot support the "Performance shift option" the DHP currently does

all you do is run a wire to Pin 21 of the PCM, and then provide a ground to activate the option, and the tables in the PCM

If you install the mechanical shift kit, the shifts with become more firm depending on throttle position.
If you simply increase the line pressure, the shifts will be firm even at light throttle applications. I find this annoying, particularly when downshifting.

I specifically told INTENSE not to increase my line pressure with the PCM because I have the mechanical shift kit.

I liked the Transceptor, that I lent to Shadd until he gets his trani rebuilt, because it can boost the line pressure by simply turning a dial for that bang screech racing mode......but I wouldn't want this for daily driving.

Cool I might have to give this a try...

I see this thread has been quite hijacked, so I'll jump on the bandwagon

So when you activate the shift mode, does it shift at a higher RPM normally or just at WOT? Just curious

I didn't highjack. I thought I answered his question.
Hans has a newer Bonner that does not have a shift button.

To change it electronically requires a PCM reprogram.
To change it mechanically requires mods to the transmission internals.

Just at WOT even with a performance shift button or with the PCM reprogramed to do it.

Hans,
My answer would be yes.
IMHO, the shift kit is better then the PCM changes because...
1. The shift kit will restrict the movement on the 1>2 and 2>3 accumulators meaning that they will be full of fluid and pressurized. To me, this means after the electrical part of the shift takes place the pressure will remain the same as compared to a quick shift then sudden decrease in pressure, because the accumulator is moving around because the fluid pressure can easily push and compress the springs inside the accumulator pistons.

2. I have made the adjustments to several cars in the PCM and in the case of part throttle shifts the electrical aspect of it will remain the same but the line pressure is not always coincindent therefore the quick shift with lower line pressure will make the shift feel kind of like a slap, it had its moment but no follow thru.

I like the use the perf shift for WOT changes only and standard to remain completely stock because you can use standard and the wife won't complain about the shift banging... :P with standard shift and standard programing its like no shift kit at all.
Actually.... I like to put the GM perf shift parameters in the standard table and mod the H*** out of the perf shift settings.

Again, I say to use an actual mechanical shift kit. Yes..

Everyone has posted the reasoning for it, I am on the band wagon with the mechanical shift kit. Different transmission in my car, but the principles are the same. Mechanical is the way to go.

Having both and the ability to loosen up the normal shift a bit is nice as Thomas has stated.

With your tuner and a shift kit..you'd have the best of both.

Thats what I have too, both.