Mike, My 2-3 shift (locked up) is very smooth. Only use it at WOT.
But yeah... OD switch is a different animal!

RJ

 

Rowland, That's good to know. I'll give it a try this spring.

I would like to know more about the OD switch? How does it work? Does it apply voltage?

 

My DTT installer did the OD switch and I wasn't there at the time to see how it was done. I've not even taken the time to follow the wires and see where it is wired in at.

 

once upon a time when my trans was all jacked up, I had no second gear and no overdrive. I looked at the schematic in the trusty chiltons book and wired up a temporary switch to the OD solenoid wire which is in the same harness as the lockup switch wire. I wired it to see if my solenoid was bad, or if it was wiring or something else. in fact I might just hook it up again for this reason.
for those of you that want to hook it up, its the only brown wire in the harness, and if you send a ground to it, it will go into OD. this is on a 95 btw.

 

On my '98, both the OD & TC solenoids are switched to ground, so it was a simple matter to wire a 3-position switch to manually control them.

 

In summer 06 i ran 10 flat in the 1/8 mile at are local track in B.C and i left my truck in OD with my bully dog on extreme mode, and about a 1/2 way down the track it would hit over drive and pull real hard, there wasent that many diesel's running but i won it for the diesel catogory. It was me and another fella with a 05 6 spd with edge programmer. he was 1 truck length behind me every run he got mad every time i beat him.

 

Oops i forgot to add that i was 4hi the whole track if i didnt i would break lose at the tree with a 12 psi launch on my poor stock tranny no wonder it dosent like to work half the time lol.

 

good thread guys, i have wondered this myself.