TFOD question

[fordpickupman]

We recently built a 12 valve with the following upgrades:

Balanced rotating assembly
Colt Cams Big Stick
4kgsk
60# valve springs
#5 fuel plate
TST AFC medium spring
4" down pipe to 5" exhaust
BHAF
Ported waste gate on the HX35
215 injectors
16.5* timing

We got a TFOD shift kit fir the 47re as well as a billet band strut, HD anchor, billet accumulator valve, and the BW solenoid.
In the instructions for the TFOD it has some options of springs depending on application. Some for a 12v and some for a 24v/gasser. The instructions refer to them as PT body (part throttle) and the other appears to be a governor but isn't labeled well. Since we changed the operating range and power band of the engine would we want to use the 24v/gasser springs? I want the trans to work with the engine like a matched pair.

The pickup is a '96 3500 4x4 with 4.10 gears and 33" tires. It won't tow often. It's also my wife's driver, so it won't get rallied too hard most of the time.

[YOUNG GUNS15]

Put the 12 valve one in.

[rockjeep73]

Originally Posted by YOUNG GUNS15

Put the 12 valve one in.

Curious as to why and what the difference is between the two springs.

[YOUNG GUNS15]

Originally Posted by rockjeep73

Curious as to why and what the difference is between the two springs.

If you look at them closely the 12 valve one is stiffer and made out of slightly thicker wire.

[rockjeep73]

I guess I meant what will be the difference in the trans/shifting with either spring.

[fordpickupman]

I went with the 24 valve springs in it. It seems to work well and the rpms are much better. I need to adjust it just a tad more. It shifts at 3200 when running it hard. I want it to run up closer to 4000 to utilize the range if the cam more. I'm waiting to see how 33" tires will affect it over the bald 31" tires.

The TFOD is a great kit. The instructions could use some more explanation on what certain decisions of mods will lake to performance.