You have a straight cam fitted.
If you have the sump Pan off as per the pictures then that's perfect for setting the cable correctly to suit your set up as you can see all three setting points and check that upstairs at the buisness end.
That will vary depending on the type of kick down cam fitted and type of cable ( long or short )
With a short cable and cranked cam the cable at rest would be around
55-60mm at rest
95-98mm to full throttle
110-114 mm to kick down ( full travel )
This is measured from the end of the threaded...
Do you have a BW35 or BW65?.
The 35 can be split from the bell house which makes it easier to remove ( and less awkward )
65 needs to come out as one.
Both can be removed from under the car just watch the fan on the radiator when you remove the box.
If your shifts are late and sloppy then the cable is too slack, if the shifts are harsh and early then the cable is too tight.
Just ensure the engine idle speed is set 600-650 rpm when warm ( lower if possible ) and your fluid level is correct.
Also worth checking the linkage as this has a...
Just check the front of the Sun shaft, when it hit the floor it might have dislodged the relief ball valve in the middle of the shaft itself ( worth checking its free moving anyway ) I doubt it came out but good to check it.
Plate colours and prefix code ( before serial number ) denote what that particular transmission is allocated too vehicle wise, it also denotes as you have mentioned different engine applications.
Each prefix code is allocated to a certain vehicle manufacturer and each prefix code / plate colour...
If that's your car pictured in the avatar ( Nada spec ) then my guess is you have a 9FU BW35 fitted, they do have a check valve spring in the valve body but the spring is very weak and just not up to the job especially if it has compressed over time as it's a really flimsy one.
Early BW35,s had...
Way to clean for it to be my thumb Harvey :)
Looking at the face of the sun shaft it is showing signs of wear, looks like the needle bearings are shot too.
Unusual for the front needle to wear badly it's usually the rear one that suffers most.
Be a good time to convert to dipstick and filler...
"There is an electronic version of the 4HP. I wonder "how electronic" is actually is. I had it on my BMW e34 5 series. It had a "sport" and "normal" selector but didn't appear to drive much differently to any other auto apart from the shift points."
That's the early type Peter...