Thread: Gearbox box has 2 prefixes 41D & 42D

Originally Posted by Blknight.aus

If Im understanding correctly, the box would have originally been in the 42D spec they then changed out the parts to make it conform to 41D configuration so manually restamped it to the 41 prefix.

Hi Blknight. Yes, that is the gist of it. As Discorevy points out 42D was for the US market with interlock - it may be that the interlock was removed for the Australian market, hence 41D.

I assume the interlock is part of the external linkage and that the locking diff is still in place with no changes to diff components, but I won't confirming that for some long time.

Originally Posted by workingonit

Hi Blknight. Yes, that is the gist of it. As Discorevy points out 42D was for the US market with interlock - it may be that the interlock was removed for the Australian market, hence 41D.

I assume the interlock is part of the external linkage and that the locking diff is still in place with no changes to diff components, but I won't confirming that for some long time.

the interlock was a solenoid that when activated prvented you from shifting the Tcase, I think but cant confim that it would let you shift into neutral but not out of neutral.

My wife's Corolla requires a foot on the brake before you can move the shift - now I know what to call the mechanism. Sounds like something we could do without. Annoys me after coming from the Discovery 1.

AI Overview.
The Land Rover Discovery 2 has several interlock mechanisms, most commonly a shift interlock solenoid that prevents the gear selector from moving out of Park unless the brake is pressed and the ignition is on. Other interlocks include a transfer case interlock, which prevents shifting the transfer box lever unless the ignition is on, and a key interlock solenoid that stops the key from being removed unless the gear selector is in Park