I have this switch now, It is used to break the circuit and deactivete the interlocking relay.
BTW FYI
Here is what I have learned so far:
Sumit racing has a cool device to connect to you speedo so you can adjust what speed it locks up. This one is for a mechnical Speedo, Go to B&Ms web site for a digital speedo:
http://store.summitracing.com/partde...188&part=12425
THIS Will answer questions about what is on the actual truck:
http://forums.chevytalk.com/forums/F...ML/002225.html
http://forums.chevytalk.com/forums/F...ML/002103.html
http://forums.chevytalk.com/forums/F...ML/002128.html
Good article on wiring a TCC for a TH700R4 should be similar for TH350C
http://home.twcny.rr.com/mcss/drivetrain.html
I have more, the news groups are full of stuff about this just go to google.com and search the groups for TH350C, TCC and that sorta stuff