A518 vs 727

I've done this swap but didn't take any pics but will as soon as the ground dries out. I had enough parts from all the 727 I rebuilt and didn't have to by any thing. I also didn't need to rebid the overdrive unit. I did rework the valve body to shift better, I did this myself and didn't buy a kit. any way, the 518 I have is a lock-up unit and has to have the convertor for it. I was able to get everything for a guy changing over to a 4-speed in his truck. also get the flex plate. the 518 bolts right up to my 318 in my 81 dodge ram 250. now the trans mount and driveshaft is another matter. you have to fab that and have the driveshaft shortened. the kick down linkage fits as does the shift linkage. there is three ways to get it into overdrive. one, change over to computer controlled fuel injection(never could get that to work for some reason)the brain is suppost to shift it. two, there is a vacuum kit that puts it in overdrive automatically, I think someone already mention that. three, this is what it did before and after the fuel injection retrofit. install a fused lighted rocket switch on the dash in easy to reach and see place. now on the trans you have a male three prong electrical connection just behind the shifter mechanism, this is the overdrive solenoid. the middle one is grounded to the chassis and the other two is for overdrive and lock-up. these two are wired to that rocker switch you just installed. so now when you're out for a drive and get the trans in third gear reach up and push the rocker switch on. it will go into overdrive in a few seconds and drop the engine rpm 1000rpm's. now and this is what you always have to remember or the motor will tell you to do is turn the switch off when slowing coming to a stop.