which trasmission valve body is recommeded?

[cleatus12r]

The valve body upgrade is simply to allow crisper, more positive shifting. It doesn't address any weaknesses inherent to the 4R100 transmission.....meaning it doesn't make the transmission any stronger. It simply allows a mechanical way of making the shifts occur more quickly without slightly increasing transmission line pressure electronically during the shifts.

If it wasn't clear (I have a habit of oversimplifying stuff sometimes) the valve body alone will not cause harsh upshifts. The valve body will cause neck-snapping shifts when combined with aftermarket tuning that increases transmission pressure during shifts......in which case we would leave the stock transmission tuning in place if you have a valve body upgrade.

[tomtom]

I had one installed before I got my PHP and it wasn't that harsh.

[cj45lc]

Thanks for the explanation Cody. The way mine shifts now is great IMHO so I'm gonna leave it alone unless someone can convince me otherwise. When I made my 3500 mile trip in Aug it shifted great & temps never got above 180-190 pulling 9-10k lbs & it was darn near 100deg crossing Kan.