Just completed the tranny swap from an FMX to a year 2000 4r70w and high stall converter. I used a manual shift valve body and a racing converter sourced from the clickclick racing forums. It can be also adapted with an electronic controler if you want to retain auto shifting. I didnt want to mess with the electronics and tuning so took the easier route.
The 4r is 1" longer so the mount is farther back, the unusual thing is I was able to modify my existing crossmember and a few other things to make it work. And look semi stock appearing, even reused the original shifter and linkage.
I have a souped up cleveland and 4.10 gears and I got tired of driving on the highway at 3500 rpms while the mini vans passed me. The overdrive and electric lock up are the reason I chose this tranny.
The other reason was to have a 4000 rpm stall converter and be able to lock it up via a switch for cruising eliminating the slippage and heat that comes with it.
Here are a few pictures
4r70w from 2000 v-6 mustang with 4k stall converter
FMX is out
Chopped forward ear and front section off, this weakens the x member, so I added gussets and boxed it in from underneath. also reinforced the factory welds which are spot welds.
I slotted the holes as far as I could to allow more adjustability on the crossmember. Then I cut this bump off the rubber mount and flipped it which also gained some room then slotted the mount as well and used allen head bolts since the new holes are now close to the wall.
Here it is installed showing the wires that shft OD and lock up, I installed the switches on the forward wall of the ashtray so when I close the lid the car looks stock.
I changed the rear yoke to a 1350 series I found at a junkyard because the 71-73 use a funky and small yoke, this gave me more driveshaft options as well as strength. The yoke was the same lenght as the original so I needed a 50" center to center driveshaft. I got lucky and found one at the junkyard that was 50 1/4" long.unfortunately I dont know what ford vehicle it came out offor reference, maybe a truck with a larger tranny.
Last night I was buttoning up the drive shaft and was so desperate to run it but my muffler was hitting the driveshaft and I lost my patience to get it running. So I need a new muffler now.
I didnt like them anyways, so I will upgrade them soon.
I should probably make a list of parts needed for the swap and such before I forget