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4+3 installation woes

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Old Sep 6, 2006 | 08:43 PM
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Default 4+3 installation woes

For those that don't know, or remotelly care, my car was originally an automatic and I thought it would be fun to change it to a manual. Not just any manual but our beloved Doug Nash 4+3. I finally was able to get a mockup of where the shifter will mount on the trans tunnel. I did so based off of pictures from the shop manual as well as interior pictures from Corvette owners. I have to say the placement height wise for the shifter coming through the console plate is dead on. So once I was comfortable with the placement, I drilled a hole in the trans tunnel for the rear bolt on the brace that the pocket attaches to (The process went fine). I fabricated a temporary bracket made out of tin for the front two screws that go through the pocket and attach to it.

So I got everything bolted in place and attached the shifter rods to their designated attachments, or so I thought. Based off the shop manual, I can't tell from the illustrated pictures if I have the shift rods going to their corresponding levers.

I know for a fact that when standing on the outside looking into the interior, the 1st to 2nd shift rod goes to the lever closet to me. After that, does the 3rd to 4th shift rod go to the middle lever or the lever fartherst away? The reverse shift rod is the shortest and I currently have that one on the fartherst lever.

I'm thinking I have these incorrectly installed as pulled up on the reverse lockout button, pushed forward on the shifter and noticed that the reverse shifter rod moved nowhere.

Also, I've just been testing out the durability of the brace I made for the shifter assembly by going through the gears (well 1st and 2nd anyway, I can't get to 3rd or 4th because of probably incorrect rod placing). Would damage occur to these gears doing this? Sorry, manual trans noob.

I'll try to post pictures up tomorrow when it's daylight. Cheap digital camera won't allow for good night time photos.

EDIT: While I only have the 1st to 2nd shift at the moment, it feels pretty good!

Last edited by 1985 Corvette; Sep 6, 2006 at 08:51 PM.
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Old Sep 6, 2006 | 09:08 PM
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Which manual do you have?

If not, I can get out my manual and look it up
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Old Sep 6, 2006 | 09:20 PM
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Originally Posted by LD85
Which manual do you have?

If not, I can get out my manual and look it up

I've got the 85 shop manual. That big one that the dealers used for repair work or diagnosis. Very good investment to boot.
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Old Sep 6, 2006 | 09:49 PM
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does this help?

http://content.madirect.com/pdf/603709.pdf
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Old Sep 6, 2006 | 10:09 PM
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Originally Posted by LD85


Thanks for the link, LD85. That's pretty much the same picture I have in my shop manual only it's smaller. I'm gonna take pictures tomorrow and see if someone will host them on here. I'll take some pictures of the shift lever in a few of the shift positions and the location as well.
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Old Sep 6, 2006 | 11:28 PM
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"I know for a fact that when standing on the outside looking into the interior, the 1st to 2nd shift rod goes to the lever closet to me. After that, does the 3rd to 4th shift rod go to the middle lever or the lever fartherst away? The reverse shift rod is the shortest and I currently have that one on the fartherst lever."

Difficult to follow your description but I would say the 3/4 rod is closest to you (not the 1/2 rod as you describe), then the 1/2 rod, then reverse.
In other words, 3/4 is the longest rod and the farthest to the outside, then 1/2 rod, then reverse. The forward gears brackets are above the connecting bolt and the reverse rod is below the connecting bolt.
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Old Sep 6, 2006 | 11:54 PM
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Left to right, the shift plates go:

3/4, 1/2, Reverse

I pulled all the photos off my old computer that might help. I had some others of the trans tunnel before I removed it, but can't find them.

http://home.san.rr.com/khastings/4plus3/















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Old Sep 7, 2006 | 12:51 AM
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There's my 4+3 expert. I'm gonna need your help a lot in the future. Thanks for the pictures and AGAIN you solved a side problem. I got two springs that came with the whole shipment and I stared at them for the longest. One night sitting here studying the manual trans section of this shop manual, I figured out one spring goes with the reverse lockout pin inside the shifter.

I had another spring that that was larger and I had no idea what that went to. Then I saw in one of your pictures where it goes on the reverse pawl (hook shaped piece on the back of the shifter). It's not really clicking in my head what the purpose of that is just yet but that's not even listed here in this book.

EDIT: Your cutout of the transtunnel and mine are roughly the same size so I'm glad to know I didn't hack into it too bad. Looks so much easier with ZF, just drop it in and be done. Trying to figure out a type of box or something to hold the shift levers and shifter is killing me.
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Old Sep 7, 2006 | 12:57 AM
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Originally Posted by CentralCoaster
Left to right, the shift plates go:

3/4, 1/2, Reverse

I pulled all the photos off my old computer that might help. I had some others of the trans tunnel before I removed it, but can't find them.







[]

In that picture, is the the top lever for the reverse shift rod? The one closest to that stationary piece of the shifter that helps hold the shifter to the pocket.
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Old Sep 7, 2006 | 01:46 AM
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Originally Posted by 1985 Corvette
In that picture, is the the top lever for the reverse shift rod? The one closest to that stationary piece of the shifter that helps hold the shifter to the pocket.
Yes.
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Old Sep 7, 2006 | 04:54 PM
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Just checking to see if I got this photo posted.

EDIT: I removed it because it was WAY too big. How do you resize photos?
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Old Sep 7, 2006 | 05:43 PM
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Alright, second try. Let's see how these turn out.









Still messing around with image sizes in photobucket. Pardon the huge size of the pictures. It looks like I may have to adjust the brace for the shifter. Have the front of the pocket angle up more. Neutral seems like the shifter is too far forward where first gear should be.

Anyone have a picture of their working 4+3 in neutral?

Last edited by 1985 Corvette; Sep 7, 2006 at 06:00 PM.
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