Lock-up Kit

[PaulR]

This is for those that are running a 700r4 trans. Do you use a 4th gear lock-up kit. If so which one? Any pros to use the one offered in Jegs (besides price) over the Painless Kit?

Thanks,

PaulR

 

[coops]

This is for those that are running a 700r4 trans. Do you use a 4th gear lock-up kit. If so which one? Any pros to use the one offered in Jegs (besides price) over the Painless Kit?

Thanks,

PaulR

I use the Ron Francis lock-up kit due to the lack of vacuum.Rons kit uses a speed sensor and I maintain a pressure switch on the 4th gear output of the valve body and brake switch to interup the positive 12v to the lockup soleniod.That way I only have lockup in 4th gear,when my foot is not in it,or no lockup at speeds less than 45 mph.

 

[PaulR]

I use the Ron Francis lock-up kit due to the lack of vacuum.Rons kit uses a speed sensor and I maintain a pressure switch on the 4th gear output of the valve body and brake switch to interup the positive 12v to the lockup soleniod.That way I only have lockup in 4th gear,when my foot is not in it,or no lockup at speeds less than 45 mph.

Coops,

Thanks for the information. I'll check them out. I didn't think of them.

PaulR

 

[PaulR]

Coops,

Thanks for the information. I'll check them out. I didn't think of them.

PaulR

Coops,

Did you use a Ron Francis wiring kit with the lock-up kit? Just curious.

Thanks,
PaulR

 

[WEDRVIT]

This is for those that are running a 700r4 trans. Do you use a 4th gear lock-up kit. If so which one? Any pros to use the one offered in Jegs (besides price) over the Painless Kit?

Thanks,

PaulR

I use a button on the shifter. Lockup anytime you want 2nd, 3rd, or 4th real cool when you're cruising around town. Harley

 

[akitagandy]

I use a button on the shifter. Lockup anytime you want 2nd, 3rd, or 4th real cool when you're cruising around town. Harley

Could someone explain or send me to some good info on this lock up stuff? I would like to put an overdrive trans in mine but I don't know any thing about how to hook it all up

 

[coops]

Coops,

Did you use a Ron Francis wiring kit with the lock-up kit? Just curious.

Thanks,
PaulR

I just purchased speed sensor kit,neutral safety which attaches to tranny gear selector output shaft,manual brake switch,toggle,relays ect.I wire my own but have helped install their kits and others on friends street rods or muscle cars.Wiring kits anymore seem to be complete;descent in engineering,but I find it should be the responsibility of the person doing the wiring kit to know the scope of what he needs.Just like load calculations for a service, branch circuits,overloads,computing configuration even at the semi conductor level of everything we use or around us.AN EXAMPLE:I have ran a alternator supply conductor of awg#10 to as large as awg#4 depending on the accessories of the particular vehicle.The hardest part to me has and will always be the routing at which one takes to seperate a wiring job with a real wiring job that is not noticed or leaves one wondering....HOW DID HE DO THAT?To each his own ....lol

 

[coops]

Could someone explain or send me to some good info on this lock up stuff? I would like to put an overdrive trans in mine but I don't know any thing about how to hook it all up

Really there is not a lot to hook up.First I know of these routes ,may be more?,to go with.1 Manual or toggle lockup.2 Vacuum assisted;painless and others are preset and non adjustable,there are a few that can be found that if I REMEMBER correctly can be adjusted to as low as 6-8 inches.Most people go this route assuming their engine has mid to high vacuum.3 Would be a speed sensor.You can go to different lockup kit manufactures and get their manuals online,most also are associated with wiring kits.

In a nut shell,take a 12v+ through a normally closed brake switch contacts then to vacuum switch normally closed contacts"as engine rpm increases,vacuum decreases" Then through housing plug to valve body;which I have a pressure switch on 4th gear (meaning mine can only lockup once in 4th gear) then to solenoid.It is series circuit to where all have to be closed to work.

You can take it a step further,I have a manual(in case my speed sensor ever failed) auto selector switch on mine,did the electric fan the same way also.

Hope this helps

 

[Hotrod46]

Here's link that I have found helpful when dealing with a 700R4.

http://purplesagetra....o/700R4p1.html

In many cases, you don't need a rewire kit.

I wired the lockup in my T just like the diagram in that link. I can select lockup in 2nd, 3rd and 4th or just 4th only. I've wired 2 700's without aftermarket kits. One needed nothing but a rewire and in one I had to change one pressure switch. I pulled that switch from a junk trans I had on hand.

I stayed away from the vacuum switch on this build because I've had trouble with them "hunting" before. If they're not set just right for your engine, you get into a constant lock and unlock situation. I've never been able to find the adjustable ones in a wrecking yard.

You do need a way to unlock the converter when you hit the brakes. GM used a special brake switch in the early 700 installations, but you can do it with a 5 pole SPDT automotive relay. Use your regular brake switch to operate the coil on the relay and wire the Normally Closed contacts to the lockup circuit and the Normally Open contacts to your brake light circuit. The same fuse can handle both circuits that way (which is how GM did it in the beginning).

Mike

 

[PaulR]

Thanks for the replies gentleman. Learning more information..... Cool.

PaulR