[Mart54]

Need advice from someone very knowledgeable with trannys. I've read that a 700 trans has the 3rd & 4th gear pressure switches inside it already, I have a stock, 2004r ('86 T-Type,BRF), does it have the 4th gear pressure switch inside also?? Don't know if I need to buy a switch yet or not. And, do you know if the solonoid is a single or two wire style on this BRF model ?? Haven't dropped the pan yet, need to lockup 4th, with a dash switch. This BRF is unmolested.

Thanks,
Marty

[454 Rattler]

I can't help you but, I'm sure someone here will.

Welcome to HR.com

454 RATTLER

[S10xGN]

I'll ASSume you're using this in a non-PCM controlled vehicle.

The BRF has both 3rd and 4th switches, but you'll want a 700R 4th gear switch, as they are N.O. and close in gear (the 200R is N.C. and opens in gear). The TCC lockup solenoid has 2 wires (actually, if you buy a "stock" replacement, you'll get a 700R solenoid with spacers).

Outside, you just need a single switched "hot" (through the brake switch) to the case connector. Inside, from the connector to one leg of the TCC solenoid, then from the other leg to the 4th gear switch (grounds in 4th). You'll have lockup only in 4th gear, and it'll unlock when you step on the brake.

Russ

[Mart54]

Originally Posted by S10xGN

I'll ASSume you're using this in a non-PCM controlled vehicle.

The BRF has both 3rd and 4th switches, but you'll want a 700R 4th gear switch, as they are N.O. and close in gear (the 200R is N.C. and opens in gear). The TCC lockup solenoid has 2 wires (actually, if you buy a "stock" replacement, you'll get a 700R solenoid with spacers).

Outside, you just need a single switched "hot" (through the brake switch) to the case connector. Inside, from the connector to one leg of the TCC solenoid, then from the other leg to the 4th gear switch (grounds in 4th). You'll have lockup only in 4th gear, and it'll unlock when you step on the brake.

Russ

Thanks Russ; I like that idea of using the brake switch hot+ to wire in the pressure switch instead of just using an ign. hot. Makes good sense and have the unlock feature at brake instead of having to flip a switch all the time

Marty

[usmcsawgunner]

thats what those tranny's are designed to do (thru the brake light hot)

[Mart54]

Originally Posted by usmcsawgunner

thats what those tranny's are designed to do (thru the brake light hot)

One other question: with the brake switch lockup method, will the locked conv. unlock with downshifts to 3rd or 2nd without touching the brake first???

[usmcsawgunner]

that i dont know i think its only in 4th

[Mart54]

Originally Posted by usmcsawgunner

that i dont know i think its only in 4th

You'd think that when the 4th gear loses pressure, as in a downshift, the convertor should unlock??? Guess I'll find out soon enough! Thanks guys, for all the help & info.

Marty

Here's a youtube video of my car I took yesterday.

http://www.youtube.com/watch?v=j_TXmApWlQs

[S10xGN]

Originally Posted by Mart54

One other question: with the brake switch lockup method, will the locked conv. unlock with downshifts to 3rd or 2nd without touching the brake first???

If you wire it through the 4th gear switch only (like my above post), it'll unlock whenever it drops out of 4th gear.

Russ

[Mart54]

I will be wiring 4th gear switch this week. I got a 2 pin AC Delco switch for $7.95!!! at the auto parts.

[Mart54]

Just to thank everyone; 4th gear lockup is wired and working well. RPM drops 200 in OD now. Unlocks in 4th when downshifting. Wired a dash light in line, for quick notice if locked or not.

Marty

Originally Posted by Mart54

I will be wiring 4th gear switch this week. I got a 2 pin AC Delco switch for $7.95!!! at the auto parts.

[S10xGN]

Marty,

Glad it worked out for you! Nice touch adding the indicator light...

Russ

[Pure Hot Rods]

Hey guys, For future reference, the 2004R has a governor pressure switch that will work the same as the 4th gear switch and allow lock in 3rd if you have enough MPH, this make the lock up more like the factory but does not require a computer or additional wiring. The converter apply oil is blocked in 1st and 2nd so it will only lock in 3rd and 4th, works great. Just a heads up for the next go-round. Randy

[Mart54]

Originally Posted by Pure Hot Rods

Hey guys, For future reference, the 2004R has a governor pressure switch that will work the same as the 4th gear switch and allow lock in 3rd if you have enough MPH, this make the lock up more like the factory but does not require a computer or additional wiring. The converter apply oil is blocked in 1st and 2nd so it will only lock in 3rd and 4th, works great. Just a heads up for the next go-round. Randy

So how is it done? You will still need to power the solenoid someway.

[Pure Hot Rods]

Same as with the 4th gear switch, just useing governor pressure instead of 4th gear. Randy