200-4R Lock Up Question

[SlyFox]

Hey guys, I'm new to the board, and hope you can help me out. I have a 69 Chevelle with 350 and a 200-4R transmission. After much highly appreciated help from Bruce (WE4) as far as getting my governor sorted out, my car has run a best of 13.65 at 99.00MPH in the 1/4. Currently, I run the B&M Speed Control that locks the convertor only in 4th gear, and only above 60mph, which is adjustable via the Speed Control. Since I am only using the first three gears in the 1/4 mile, obviously I am not locking the converter while racing.

I am hoping to find a little more top-end speed with this combo and break the 100MPH barrier. To that end, I would like to experiment with locking the converter in 3rd gear, above a pre-determined RPM, maybe 4000 or so. Can anyone explain the lock-up wiring necessary for this? I'm basically a novice with electrical stuff, so a description in layman's terms would be much appreciated.

Thanks,
Mike Newby

 

[SlyFox]

Anybody???

 

[SlyFox]

Thanks guys, you've been a big help.

 

[MeanBuicks]

Maybe you should jump up and down & shout!

The operation of the solenoid is simple requiring only 12V & ground to apply. What you'll need to do is determine how to access your solenoid ground wire to force lock-up.

Not knowing how your wiring is configured, I can't give you specifics. If your fourth gear pressure switch is external then you merely need to splice into this wire before the pressure switch so you'll have access to ground. Then you can run your spliced wire to a toggle switch where you can manually ground the circuit in 2nd, 3rd or 4th gears. (This all assumes that 12V is always present on the positive solenoid wire.)

If your fourth gear pressure switch is internal, on the valve body, you'll need to make your splice in the pan, & run it to the case connector.

 

[SlyFox]

Greg, thanks, this is a big help. I believe the pressure switch is internal to my transmission, on the valve body, but this is enough to get me started at least. Thanks again.