I have a floor shift E4OD automatic in my 89 Bronco. I have recently got a sweet deal on a M5OD with a new borg warner transfer case. I know what all I need to get for the trans swap except for the drive shafts. I'm having trouble finding info on that. I was able to find driveshafts for an 89 manual 5 speed on broncograveyard. I know the front is 37 and 1/4 and the rear is 26 and 1/2. My main question is what are the drive shaft lengths for the E4OD that are already on the bronco now?

 

Well I don't know too much, but according to O'reilly's for the 90s broncos (which I believe the 80s would be the same), the AUTO E4OD driveshaft lengths are:

39 1/2 for the FRONT with the E4OD (and 37 1/2 for the M5OD)
23 3/8 for the REAR with the E4OD (and 25 7/8 for the M5OD)