Hello Jim; Perhaps this table from a Laycock paper will help.
--Scott Morris, Simcoe, Ontario, Canada; '60 MkI BN7, '62 MkII BT7
Laycock de Normanville Overdrives A-Type
Unit
Type
Ratio
Serial No.
Model
Year
Hydraulic Pressure
P.S.I.
Notes
R
E
F
A
SN 28
1292
Austin Healey 100-4
420 440
L
A
SN 28
1447
Austin Healey 100-6
470 490
L
A
SN 22
3009
Austin Healey 3000
470 490
L
A
SN 22
3087
Austin Healey 3000
470 490
L
REF:
L Laycock Overdrive - Section 1: Working Principles, Maintenance and Fault
Finding , Laycock Engineering Ltd, Undated
bluechip <bluechipracing@snet.net> wrote:
I have a sideshift gearbox /overdrive assembly I am trying to identify. the
gearbox number is 10771, the OD is 22/3009/005148. It has the long shifter with
the two bends, so I think it might be from an early 3000 mkII. None of my
reference books delineate the gearbox or OD numbers with respect to car model
or year. Any help would be appreciated. Jim Smith East Hampton, CT
J. Scott Morris - Keep Smiling, Murphy Lives
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