I'm not going to argue with Dave as he has all that information right at his fingertips. So I have been mistaken about the compatibility of the pinion shafts and sorry for that.
Add info. After brushing up on my lack of knowledge, I found so far that those two type numbers ( 50A-J ( stumpy bell housing and 53A-J Short bell housing ) they have a reference to the layout type of the shift mechanism.
Ref; http://www.ashcroft-transmissions.co...od&productId=6
Ref; http://www.ashcroft-transmissions.co...atio_calc.html
Ref; http://www.freewebs.com/tmtransmissions/Different types of R 380
The manual boxes can be categorised as "Long Stick" as fitted to the Defender and "Short Stick" as fitted to the Disco.
If your serial number starts with any of the following then you have a longstick : 50A, 51A, 56A, 58A, 60A, 61A, 66A, 68A, 74A
If your serial number starts with any of the following then you have a shortstick : 53A, 55A, 63A, 67A, 69A, 73A
The longstick boxes come with the top casting that the gearlever and turret bolt to but you will need to remove the following from the old unit : the bellhousing and dowels, transfer case dowels, gearlever and turret and diff lock pivot bolt if fitted.
The shortstick boxes come with remote top assembly with reverse switch fitted but you will need to swap over the bellhousing & dowels, transfer case dowels, extension gearstick and diff lock pivot bolt.
The only exception to the above is the 64A and 65A, these come less bellhousing and less remote shifter.
Gearbox identification stamped on flat oval surface next to the drain bung.
The first two numbers (prefix) denote the vehicle model application.
The last letter (suffix) denotes the gearbox type.
DISCOVERY CODES:
Prefix 55 suffix G/H 200 TDI LT77. Prefix 55 suffix J 300 TDI R380. Prefix 59 suffix G/H V8 LT77. Prefix 73 suffix L TD5 R380.
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DEFENDER CODES:
Prefix 56 suffix G/H 200 TDI LT77. Prefix 56 suffix J 300 TDI R380. Prefix 68 suffix L TD5 R380.
I will have a look amongst my books and see where I slipped up on the teeth counts though. still searching
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