I know this is an old post but I just did the conversion.
electric to mechanical.
- Housing adapter
-Tail shaft gear
-tail shaft gear clip
And seals.. if your are bad
-Pull out the drive shaft
-Remove tail housing of 700r4.. 4 bolts
-Remove electrical sesnor from tail housing
-Pull sendor from output shaft, little heat helps here.
Install plastic gear on output shaft with clip... don't for get clip...
- install tailhousing back on to trans.
-install mech gear and adapter back into tail housing.
-turn trans to make sure gears are meshing.
- install speedo cable....
you may want to make sure you have the correct ratio (before you order parts) or your speedo will be off..
do a google search for 700r4 speedo gear ratios there are quite a few sites out there.