A833 to SM465 swap questions?

[Joe Z]

I have a 2wd 81' c10 with a 66' 250 I6 and I believe if I remember correctly a 2.73 gear ratio. I have an A833 factory tranny in the truck and can't really afford a rebuild plus with the gears and older motor I can't use the overdrive now anyway (it had a factory 250 but died last year). I found a 2wd sm465 for sale and was wondering if anyone knew if it's a bolt in swap? Can I use the original drive shaft and crossmember? Will it have a similar or lower 1st gear?

I know I'll have to modify the floor but I swapped the cab a while back and I just have to make a new hump.
Thanks in advance for any help.