The transfer box has jumped into neutral almost every time I've taken Wallit for a drive, I'd looked at the linkage & gear lever to make sure that nothing was restricting the travel and all was OK.
A new transfer box detent plunger & spring came in the last consignment of spares from the UK.
Today I finally got round to pulling the seats out and having a look at the situation.
With the toolbox under the centre seat removed I removed the small cover plate on the transfer box and also the detent spring & cap.
Holding my finger on the detent plunger and changing from High to Low allowed me to feel the three detent positions.

Neutral & Low were OK, so was High but looking in the transfer box there was a little more movement left after the detent position to fully engage High.
I undid the clamp bolt on the selector fork and slid it forward a fraction (there is a cutout in the shaft the bolt locates in so very little movement available). Re-tightened the bolt and now at the detent position it had better engagement.
The detent plunger was worn at the end and the spring had been stretched at some point in it's life. The wire diameter was thicker than the replacement but it seemed to have about the same compression.
Here are the old parts.

So back together and off for a run (after filling in my logbook). Didn't get time to go far but no issues with dropping into neutral, need a longer run next weekend.
Colin
'56 Series 1 with homemade welder
'65 Series IIa Dormobile
'70 SIIa GS
'76 SIII 88" (Isuzu C240)
'81 SIII FFR
'95 Defender Tanami
Motorcycles :-
Vincent Rapide, Panther M100, Norton BIG4, Electra & Navigator, Matchless G80C, Suzuki SV650
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