Transmission tunnel help needed ! - Impala Tech
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post #1 of 4 (permalink) Old 04-09-2016, 05:36 PM Thread Starter
rcb
 
 
Join Date: Mar 2016
Location: Pittsburgh, PA.
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Transmission tunnel help needed !

New to this site ! Converting my 63 Impala from auto to 4 sp.
I purchased an original manual trans floor tunnel cover from a donor
car and want to cut out my floor to the correct size hole. Can anyone
supply me with the actual size and location of the floor opening ?
Many Thanks...
Bob
Pittsburgh, PA.
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post #2 of 4 (permalink) Old 04-10-2016, 03:16 PM
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Welcome to the Team!

Info like that is locatedin the GM copyrighted Assembly manual. It lists the information of where to cut the hole for the floor shifter referenced off the floor seam and a few bumps made to support the seats. I don't have a 1963 Impala or I could give you the dimensions as I bought said manuals for all of the cars I have owned. Your car uses TWO Assembly manuals; the 1962 year series of books plus a 1963-'64 supplement.

Hopefully someone who has performed this operation, or who has a a copy of the $25 each manuals can provide you with the dimensions.

Big Dave
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post #3 of 4 (permalink) Old 04-12-2016, 08:58 AM Thread Starter
rcb
 
 
Join Date: Mar 2016
Location: Pittsburgh, PA.
Posts: 5
 
Thanks Big Dave for the info... I have the assembly manual and it shows the location of one of the bolt holes for the tunnel cover
measured from the edge of the carpet. Since the mouse infested carpet has been removed, I can't get an accurate measurement.
Thanks again...
Bob
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post #4 of 4 (permalink) Old 04-12-2016, 12:00 PM
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Quote:
Originally Posted by rcb View Post
Thanks Big Dave for the info... I have the assembly manual and it shows the location of one of the bolt holes for the tunnel cover
measured from the edge of the carpet. Since the mouse infested carpet has been removed, I can't get an accurate measurement.
Thanks again...
Bob
Because the part of the shifter body where the handle attaches to it, needs to be basically centered in the 'hole' in the tunnel extension, locating that point from the interior of the car is risky.

One way to reduce the risk is to locate that point from underneath, using the actual transmission and shifter body, lifted into position, as a template. Mark, and drill a hole from underneath. From there cut a temporary hole in the tunnel (maybe 6"L x 4"w) for the shifter body to fit through.

Delay final cutting and installation of the tunnel until the transmission w/shifter body attached is in place. Fit the tunnel extension precisely where it belongs and mark the outline. Remove as much of the tunnel as you wish; making sure you leave enough steel to attach the tunnel screws.

I believe GM removed all the steel 'inside' the extension to avoid creating a pocket to trap water. Also, there is a water proofing 'seal' between the extension and the tunnel.

If you want to jazz it up a bit, you may make it look like my '63. That's a shifter plate from a '61 SS w/bench seats.
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