Also sounds like your T/C isn't locking up until you hit high gear which would also cause that condition....

How much is a t/c lockup switch and whats the difficulty on instaling? i am mechanically inclined but ive always been a gas motor guy

When should the T/C lock up without a switch? Just in O/D?

Usually it'll lock in third as well, helps keep heat down and builds speed much quicker.

I installed a T/C lock switch in an 04', was a simple as tapping into a wire on the tranny harness and running it through a toggle to ground with a certain ohm resistor inline. Don't remember which wire though offhand, IIRC it's in one of the stickies/FAQ's.

I will have to pay attention to mine, I will be towing for the first time with it next week after all the work that went into it.

I've read 2 sides to the t/c lock, some say its the best, and others say its a disaster waiting to happen! don't really know what to believe, I've also heard of people leaving the switch on in every gear.. what would you gain from that? id imagine it would be good for towing.and work well with an exhaust brake.??

In all my research, I've decided not to do a lockup switch until I have a billet input shaft. All the research I've done says you run the risk of snapping a factory input shaft with a lockup switch.

As far as will the tranny hold up to a boost elbow, some afc mods, and 4k gov springs, in my experience its a no.... Mine didnt. You may have better luck, but I noticed as soon as my boost and torque increased, my tranny started slipping. And this was after my goerend torque converter and valve body. The new stock clutches in the tranny failed shortly after.

if you USE your turck i recommend NOT HAVING THAT DARN SWITCH! its like shifting a manual without a clutch at WOT! BAD BAD BAD for everything YES you will get going faster, faster but man its bad for stuff. just dont do it unless you are on the strip. its super easy to do. one wire and a toggle switch. but its not worth the tranny rebuilds

and a stock VB will only allow it to shift from 3 to OD correctly . it will SLAM if you try to lock it up right off the bat

or just turn it on/off? I installed it for the dude for trailer hauling as it was kicking in and out of T/C lock and heating up.

That's a resistor that you can buy, that will fix your OD lockup...