drumdrew

I just inherited a '68 C-20 with stock 307 4-speed and only 73000 actual miles. I have driven it many times in the past but haven't crawled under to get the rear end ratio but it is the GM diff rather than Dana. I plan to do a mild build on the engine and probably add EFI. I would like to upgrade to T-5 tranny, to improve mileage, if this is a reasonable swap but am really unsure of what I may need. I am fortunate to have a salvage yard, close by, that specializes in '54-'90 GM trucks so parts availability should be good. I know the T-5 has been a great box for performance applications in the 70's and 80's but am unsure if it is a good fit for a truck that still pulls a trailer once in a while? I know many of you would just say dump the 307 for a 350 and move on but I want to keep the original engine as much as possible. Any great guru wisdom on this swap would be appreciated.