4L60

[STEVE1103]

Have a 91 4L60 from Camaro in my 47 Chevy, have a kit for the lock up converter, the electrical conn is OK, but the sending unit has no place on the 4L60 to be installed (book said it was a 700R). Do you have to drill and tap the case , someone said to do it on the servo cover, anyone have any info on this conversion?

[SMOKEmUP]

What kit do you have?

To use the lockup wire the trans like this.

[clay]

I'm thinking you are talking about a pressure switch that goes inside the transmission. I tried a kit years ago that had a vacuum switch switch that would supposedly lock it up under high vacuum. It also had a manual lockup option that I used most of the time as I couldn't ever get the vacuum switch adjusted to work just right. It also had a switch to replace the factory switch (not sure why) that I'm assuming was located in a passage that gets pressurized in 3rd and 4th gear. Go ahead and drop the pan and it will make Smoke's wiring diagram make sense and you can actually follow the wires and see where they go. I have seen a kit that looks like it uses some sort of sending unit that installs in line with the speedometer cable and I would think it might be better able to be tuned to what you like but I never got around to using it as I stopped messing with the 200R4. Clay

[STEVE1103]

I have a kit from Rebel wiring co. The unit ( looks like an oil pressure sending unit) it is suposed to go in a plugged hole to the left of the servo cover, the 700R has this but the 4L60 case don't. There is a ground wire, a 4 prong electrical plug, and a hot wire.

[af2]

[10sec.et]

ok, im confused. do you have a 700R4 or a 4L60 ? if its a 4L60, arent they computer controlled ?

[clay]

[STEVE1103]

I am not sure about your diagram, where do you get the brakes part from, I took all computer stuff off engine, running a Blazer intake, carb and distributor. Is this in the pan, have not worked on an automaic trans in years. Last one was in Vietnam, that was an allison 6 speed, now you know how old I am!!! Us old guys need a little help with this stuff. Thanks guys!

[clay]

Hey, you're never too old to learn. I know on my S-10 it actually has the contacts inside the brake switch to control the converter lockup along with brake light operation which is what Smoke's diagram is showing - two sets of contacts inside a common switch. Power gets supplied through the toggle switch and then to the brake switch normally closed contacts and then to pin "A" on the 4 pin connector. Pin "D"supplies the ground for the internal solenoid that actually diverts fluid to control lockup. The brake switch in the circut makes the system work much better. Without it, the transmission will unlock the converter if you leave the toggle switch on when you come to a stop but it most likely won't unlock soon enough and you could get sort of a "chuggle" right before it unlocks. Don't let it intimidate you, once you get it you'll think it's really simple. Keep asking questions and you'll get it. Clay

[10sec.et]

[STEVE1103]

I know the case is different, I have a 700R in my garage, they look the same, but they are different. Was told by a good tranny guy that I can use the servo cover to install my sending unit, drill and tap or put in a bung. It will activate the converter, it has the fourth grear oil pressue need for this kit.

[af2]

This thread is competely useless without pics of the 47!

[STEVE1103]

Can't send my pictures, they are to big I think. Where do you pick up the brake in the diagram? Is this inside the trans? Thanks

[af2]

Pin A needs to go through the NC on the brake switch so it opens on braking. Before the brake switch is 12 volts on the NC side.

[squeeezer]