3joh

On my '69, my tranny is not down shifting when I jump on it. I understand there is an electronic kickdown switch. Where is it located? any pics floating around out there? is it adjustable?

Thanks!

Jeff

tigers123

It is up above the gas pedal. Usually the fuse is blown so check that. Get yoursel an aim manual and a wiring diagram. Thus harness also controlled the cowl induction solenoid.

3joh

would this be an inline fuse or is there a spot in the fuse box?

Jeff

3joh

I checked my aim manual for location and wiring...I don't have a switch mounted on the gas pedal. Bubba didn't think I needed one. Is the switch and bracket readily available? I'm going to make sure I have the wires still in place.

Jeff

tigers123

I've been told that chevelles use the same gas pedal switch arrangement. I believe the harness is still available from one of the catalogs or you can use a b and m or lokar electric switch mounted up by the carb. If somebody messed with your car before you got it [changed it from a manual to an automatic] it might not be there.

tigers123

this is from jegs http://www.jegs.com/webapp/wcs/store...10002_31808_-1

3joh

The harness is still intact under the dash, I will need the switch & bracket.

I adjusted the modulator valve (1 turn cw) and what a difference. The shifts are snappier when you are getting into the throttle. I will be adding a shift kit to improve the shifts when I am not shifting manually.

I am heading to a swap meet this weekend so I will keep my eyes open for the kick down switch. Does any one have a pic showing what the bracket looks like?

Jeff

goinbroke

The actual switch looks like this. http://www.ss396.com/mm5/merchant.mv...=TRANSMISSIONS

The mount for it is not removable, but built into the dash framework as I recall.......not 100% sure.
You can still get these kickdown switches from the GM parts house.

langlj00

See link:

http://forums.corvetteforum.com/show....php?t=1737591

Same kind of questions.

Although mine is now wiring and firing the dentent solenoid in the box it still doesn't kick-down

I'm thinking of dropping the pan and valve tray and giving it a clean out.

Questions:
1. Is this easy to do on the car (ie. do the steel ***** go everywhere) ?
2. While I'm at it is there any point in putting in a B&M shift kit ?

Anyone using the B&M - pros and cons ?

Jeremy.

jotto

Jeff

what is the modulator valve adjustment for and what difference did it make...

tigers123

I've been told the transgo shift kit is the one to have. Also modifying governor weight helps as well on shifts. But both of those I would have to seek out help with myself. I changed a lot of fluid and filters on those transmissions in my youth, but never did major work on them.

langlj00

The stock modulator does not have this adjustment.
An aftermarket bulb - such as the Art Carr one has an adjustment whereby you can change the shift point by a few miles an hour.

(Allen screw in the vacuum pipe - pull the vacuum, turn the screw, re-fit the hose).

Hope that helps Jotts........

Jeremy.


"The vacuum modulator regulates shift points according to engine vacuum to make the transmission upshift at lower rpm during part-throttle driving. On the left is a typical stock GM modulator. The modulator on the right is a typical adjustable modulator, and the middle modulator has a larger diaphragm that Auto-Rite says works well with engines that produce lower vacuum. Art Carr and B&M offer adjustable modulators for the TH350 that allow you to adjust the shift points within a 2- to 4-mph range."

3joh

in addition to regulating the shift points it went from a soft mushy feeling transmission to a crisp shifting operation. It is not quite as snappy as a shift kit but it definitely helped. If you take off the vacuum line on the modulator and look in the hole you will see an adjustment screw. (probably not on the standard modulators)

Jeff