Manual tunnel hump

[trailcarnage]

Hello y'all,

I'm in the midst of a first time build. I removed a 454/700r4 combo from my 1970LWB and am replacing it with a LT1/A883 combo. The A883 is a side loader 4-speed with an external Hurst shifter.

Tonight I pulled the floor covering to removed the tunnel hump only to find that it is part of the body. This leads me to 2 questions:

1) There is a nice bead stamped into the floor. Which line to I follow with the cut? A, b, c ,d?

2) What height hump do I need to clear the Hurst shifter? High or low?

[Gmc.guy]

I would try to fit it in the low hump first, Then if your carpet is good your already set.and the hole could be patched up later easily. If it doesn't work or if you do go with a high hump I would grab one first. Then mark it for the cut and the holes too for some j nuts or weld some up. I put a floor shifted 3 speed in my 74 years ago and it worked out with the small hump. I have since went back to t350.
But I am picturing the A833 similar to the Muncie's. Hmm.

[Gmc.guy]

I have a couple pics on my phone of a parts truck I have

[Gmc.guy]

Sorry. It prob doesn't help its bolted down still but I don't have it anymore to get anymore pics. This was a 71 if I remember right

[trailcarnage]

Cody,

If I understand correctly, you are suggesting installing the trans with the tunnel in its current state to see if it fits and then choosing a bolt in hump, correct?

As far as the A883, yes it looks much like a Muncie.

[weim55]

IF the A833 is one of the Chevy square body overdrives with the stock hurst mfg. shifter it will work with your low hump floor and a proper boot screwed to the floor. This is with the stock mounting of a first gen small block with the engine in the original stick transmission location. If your moving the engine mount arrangement around or the shifter placement is odd you might run into some clearance problems with the shifter and the front of the seat. Might want to mock up the engine- trans-shifter minus the shifter handle in the truck before you cut any holes and have a look exactly where the hole is gonna go.

Steve weim55 Colorado

[Gmc.guy]

You bet. I would try first. The big hump takes a lot of room that you would wish you had still.

[trailcarnage]

Right on folks! That is what I was hoping to hear.