Green hornet
Veteran Member
I just completed a 4 speed swap in my 70 (see new 1970 owner in project progress). In doing so I looked all over this site for the cut out placement for the shifter and shifter hump. I found a lot of people asking the same question but no real answers. I would like to share how I went about it with photos to help others doing the same procedure.
The first thing I did was make two reference lines on the trans hump. I drew a center line between the front and rear mounting holes for the A/T shifter and one line connecting the front mounting holes. With the shifter attached to the trans I jacked it up as close to the floor board as I could and drilled a small pilot hole (see nail in the photo)
The pilot hole is 2 inches left of the center line and 2 1/4 inches down from the top reference line. I then made a 2 1/2 inch hole saw cut. That allowed me to raise the trans so the shifter would stick through the floor.
I then centered the shifter hump over the shifter and transferred the opening to trans hump. I then cut the opening. This allowed me to raise the trans further and install the cross member.
I then fine tuned the opening to make sure the shifter had enough clearance. The final opening was 4 3/4 across the trans hump x 4 1/2 along the center line. With the shifter in neutral I centered the shifter hump front to back using the hole for the shifter boot in the shifter hump and a small level left to right.
This information is just a guide to help anyone with this procedure. The dimensions may be a little different for your car. Hope this helps. I had a fun time making this swap and it was well worth it.
The first thing I did was make two reference lines on the trans hump. I drew a center line between the front and rear mounting holes for the A/T shifter and one line connecting the front mounting holes. With the shifter attached to the trans I jacked it up as close to the floor board as I could and drilled a small pilot hole (see nail in the photo)
The pilot hole is 2 inches left of the center line and 2 1/4 inches down from the top reference line. I then made a 2 1/2 inch hole saw cut. That allowed me to raise the trans so the shifter would stick through the floor.
I then centered the shifter hump over the shifter and transferred the opening to trans hump. I then cut the opening. This allowed me to raise the trans further and install the cross member.
I then fine tuned the opening to make sure the shifter had enough clearance. The final opening was 4 3/4 across the trans hump x 4 1/2 along the center line. With the shifter in neutral I centered the shifter hump front to back using the hole for the shifter boot in the shifter hump and a small level left to right.
This information is just a guide to help anyone with this procedure. The dimensions may be a little different for your car. Hope this helps. I had a fun time making this swap and it was well worth it.
