Does my transmission mount have to move?

[F100builder]

Perhaps this has been answered a dozen times but I couldn't find a definite answer after searching. I'm installing a 390/C6 combo into my '70 2WD SWB which originally had a 240/3-sp. on the column. Are the 3-speed manual and C6 cross members the same? If not, can it still be used for a C6 and if so, does it need to move back in the frame? I could go look at my '69 with its 390/C6 but the previous owner never moved the engine towers back from the 240 location during its swap and the truck came with a spare cross member in the bed...I haven't really ever compared it with the one in the truck now.
I was just hoping someone knew off the top of their head. If not, I'll grab my tape measure and go get my hands dirty in the morning! Thanks in advance.

[Whateverman]

the crossmember is the same,you'll most likely hafta move it in my ol'pig i've had it mounted in a different spot for each different trans i've had (c6,c4,& np435)

[Brokenarrow]

Perhaps this has been answered a dozen times but I couldn't find a definite answer after searching. I'm installing a 390/C6 combo into my '70 2WD SWB which originally had a 240/3-sp. on the column. Are the 3-speed manual and C6 cross members the same? If not, can it still be used for a C6 and if so, does it need to move back in the frame? I could go look at my '69 with its 390/C6 but the previous owner never moved the engine towers back from the 240 location during its swap and the truck came with a spare cross member in the bed...I haven't really ever compared it with the one in the truck now.
I was just hoping someone knew off the top of their head. If not, I'll grab my tape measure and go get my hands dirty in the morning! Thanks in advance.

I did the same swap on my truck. If you mean the transmission crossmembers, they are different, one is offset & the other is centered. Either will work but you may have to drill new holes in the frame if you use the standard crossmember. Also these trucks have two different "humps" in the transmission tunnel. Mine has the small hump & the C6 is very close to the floorboard. It works but bolting/unbolting the transmission mount is a PIA . Here's a pic showing the difference in the crossmembers.

[F100builder]

Thanks for the reply and photo! I will be cutting the transmission tunnel out like a C6 truck and I have an extra C6 'hump' to bolt in place.

[Brokenarrow]

Thanks for the reply and photo! I will be cutting the transmission tunnel out like a C6 truck and I have an extra C6 'hump' to bolt in place.

It will work without cutting and the extra floorboard space is nice.

[F100builder]

I'm installing a floor shifter though and I'd like to have better access.