Some parts for the drive end do interchange between the D4400 and D4600
Shaft 1F3753 does
Sleeves do not (D4600 is larger)
Pinion 6B1360 does
Latches do
Button does
The stop, plunger and springs do
The starter pinion control on the 8T is like that on the D4. Have to access from the clutch side.
Like OLD MAGNETsome parts are interchangable but not all and if I can help I should have these parts let me have the parts number than your looking