Question re: Transmission/back-up light linkage

[Paul P.]

I have a 1970 454 w/Muncie 4spd. I can't figure out the back-up light switch linkage to reverse gear and can't find the configuration on any manual I have or any parts providers' web sites - all they show is the parts, but not how they go together. Can anyone help? Thank you.

[Chuck S.]

Re: Question re: Transmission/back-up light linkage

I have a 1970 454 w/Muncie 4spd. I can't figure out the back-up light switch linkage to reverse gear and can't find the configuration on any manual I have or any parts providers' web sites - all they show is the parts, but not how they go together. Can anyone help? Thank you.

Got AIM?...See UPC M20, Sheet A5.

[Paul P.]

Re: Question re: Transmission/back-up light linkage

Chuck, pardon my ignorance, but I don't know what "AIM" is.

[Chuck S.]

Re: Question re: Transmission/back-up light linkage

Chuck, pardon my ignorance, but I don't know what "AIM" is.

Assembly Instruction Manual...it's a book of drawings the factory used to put these cars together; there's a dedicated edition for each model year. It's available at the NCRS store, and probably the most important "manual" you'll need if you're restoring a Corvette.

[Chuck S.]

Re: Question re: Transmission/back-up light linkage

While you're waiting for your AIM to arrive, I'll try to stutter and hand-wave my way through a description of the switch configuration for you...of course, you won't be able to hear the stuttering or see the hand waving :

The back up light switch bracket mounts at an angle to the bottom two cover bolts on the rear of the side cover. The switch mounts to the bracket with two screws with the switch arm UP. A wire link goes through the switch arm and is retained by a tiny cotter pin; the link then attaches to a round hole in the reverse shift lever, again retained by tiny cotter pin. When the reverse shift arm is shifted, the back-up switch is activated by the link rod.

[Paul P.]

Re: Question re: Transmission/back-up light linkage

Thank you. I'll go ahead and order one, but was hoping to get a picture or diagram of this particular linkage sooner. Thanks for your guidance.

[Robert S.]

Re: Question re: Transmission/back-up light linkage

This supplier's online catalog has one view of the backup switch linkage installed on the transmission. Go to page 216 in the following link.

http://www.youblisher.com/p/2303-No-Title/

The view is not as good as the AIM, but with Chuck's description, it may be helpful.

[Paul P.]

Re: Question re: Transmission/back-up light linkage

Thanks, that's the way I've been trying to install it (switch arm up) but the link seems to be about 1/8 inch too short. I know that can't be right, because, the SOB came off and I haven't changed anything. The main thing is the orientation of the switch arm itself. I didn' know if maybe it should be pointing down. I'll keep muddling through, but thanks.

[John H.]

Re: Question re: Transmission/back-up light linkage

Maybe this will help...

[Paul P.]

Re: Question re: Transmission/back-up light linkage

Thanks Robert, Chuck and John. John, although the photo doesn't appear to be the exact tranny, it's what I need.

[Tim S.]

Re: Question re: Transmission/back-up light linkage

Thanks for the pic!. That solved one of my problems