Replacing a 3.8 manual w/ a 3.8 auto

[voteaustin]

Same year, 99/00, same housing
no need for the 01 and newer engine mounts,
but what will i have to change about the auto engine to keep my standard gear ratios?
again, VERY new to the mustang engine....

also, if anyone knows where to get a NEW radiator for the 00 3.8?

 

[klotzstang]

Same year, 99/00, same housing
no need for the 01 and newer engine mounts,
but what will i have to change about the auto engine to keep my standard gear ratios?
again, VERY new to the mustang engine....

also, if anyone knows where to get a NEW radiator for the 00 3.8?

If you are talking about the rear end gears, you can use what you have.
But you are stuck with the transmission gears, the manual is a 5-speed, and the automatic is a 4-speed.

Any radiator shop will sell you a new radiator. To switch to an automatic, just add a transmission cooler, larger than standard anyway.