transmission and gearing questions

[72c10lover16]

I have a 72 c-10 350 4b with an automatic trans behind it and i also just bought a 69 chevy c-10 straight 6 with a 4 speed. I was hoping to put the 4 speed in my 72 eventually but i was wondering how that would work out. some people have told me the gearing may be to low im not sure though.
Please let me know anything you know

[mrein3]

Both transmissions have the same final gear. 1:1. The only difference is that the auto will have some slip in the torque converter resulting in a slightly higher rpm on the highway when in high gear. That is why manuals get a bit better mileage than an auto with all other things on the truck equal.

The 4-speed may have a much lower 1st gear depending on the particular 4-speed you have.

[72c10lover16]

so the swap should work fine. does it matter what rear end i have in it.

[mrein3]

Originally Posted by 72c10lover16

so the swap should work fine. does it matter what rear end i have in it.

Switching from an auto to a straight stick in your truck, without changing rear end gears or tire size, will drop your highway RPMs slightly. The slight drop will come from not having a torque converter slipping like you have in your auto right now.

[72c10lover16]

so when i go to swap them everything will function properly?

[cdowns]

do lots of research on the swap such as changing crossmembers linkage etc// in my opinion a step backward

[72c10lover16]

is there anything else i need to know for this swap? what about driveshafts? i should be able to put the 69 one in my 72 right. thats after i switch the trannys.