Well my tire size is about 30's so wat would be good to lock my converter quicker

 

you are talking about lock up at full throttle right? you change that in the tune, not the gears.

 

I wanna lock it up when i hit my 4th gear

 

part throttle or full throttle?

 

Full throttle! !

 

Are you rocking the stock converter or a triple disk? I think you're looking for problems if you lock the stock coverter (or a single disk for that matter) at WOT, but I'm not an expert. Maybe someone will chime in.

As for the gears, 4.11 gets my vote with your tire size combo.

 

Its a 3600 multi

 

which transmission are you working with?

 

A 60e

 

how fast are you going when you hit 4th gear...and at what RPM?