Transman, the transmission is built, but I don't know all the specs. I'll ask the guy who built it about that. I known it has hd clutches, kevlar bands, more oil to the overdrive, valve body mods, etc.

I went ahead and ordered the 20 to 120 psi switch from summit.
Maybe I should connect that to the 12 volt input wire, and then keep my two switches hooked up to the ground wires. Then get the switch adjusted so that it powers up both the overdrive and lock up at about 40 to 45 mph. Then keep my switches off and until I am ready to activate them. At least that would drop them out if I have to make a quick stop, or if I forget to. Thanks for all the help!

Transman, I talked the guy who built the trans today. He said the pressure has been increased, but he didn't know offhand how much. What do think would be a minimum pressure during deceleration using the exhaust brake? He mentioned putting a solenoid that somehow operated the cable to increase pressure when using the exhaust brake. That must be the devise you speak of. Where would I hook up a pressure gauge to test it? Thanks, Joel

Use the line pressure tap to monitor, passenger side of main case, center tap.

By increasing pressure I assume he means line pressure by adjusting the Allen head screw on the valve body.
But that won’t help you at closed throttle on the Jake hauling all that weight.

He is correct, adding a solenoid or driver motor to move the throttle pressure cable lever all the way back when using the Jake is the direction you want to take.

The later 48RE transmissions have a TTVA on them to accomplish this very thing for the same reason.

Also the Jake is much more effective when the lockup converter is on.

Thanks for that info. Does anyone have a link to a device like we were talking about to kick up the pressure when the brake is activated?

I also loved driving my 47RH-equipped 1st gens with OD and LU on toggles - puts me in charge of them. So what you're looking for is something speed-related that will 'enable' the LU circuit over a certain speed, like 15 mph or so, and disable (unlock) it below, correct? I don't know if this would work, but if you have a 4x4 (NP205) I think you can thread one of the slick B&M Converter Controllers (i.e 70244 - link below) onto the t-case speedo output and wire it to a relay, which could 'enable' your manual LU toggle at whatever speed you'd want. The controller simply outs 12v signal at speed 'X' - B&M markets the thing to control LU on a GM but it could be used to turn on 'anything'. You can dial in whatever speed you want. Buddy of mine uses two of them in-line with the mechanical speedo in his 87 Ramcharger to control both the OD and LU - all automagic, and all adjustable. Not sure it'll work for your 93, but if so then coolieo.

There's a couple different versions of the thing - the 70244 is for mechanical speedos and the other for electric - maybe you can make one of them work? I have an Atlas t-case in my 02 big block Dakota with a mechanical speedo and the I'm considering using one to disable LU in my 46rh.

https://www.summitracing.com/parts/bmm-70244

- Sam

https://www.xtremediesel.com/bd-power-pressureloc-transmission-kit

This was the one I saw “back in the day”….. but no longer made