They are both full synchro IIRC. The early ones were the only ones that were
not.
It doesn't have anything to do with the OD other than the shaft however, as all
of the synchros are in the tranny and not the OD.
I have the early type for my '70 B, (It is correct for the '70) and unless I am
mistaken it has the full synchro. The later ones only have OD on 4th gear, but
I don't know if that is when the color plate changed. I have it in 3rd and 4th.
On Wed, 7 Feb 2001, William T Snyder, II wrote:
> Thanks, list, for the replies to my questions on OD transmissions. Paul
> Tegler responded that the later Laycock (not the early type D) OD trannys
> had two different name plates. The earlier version had a black on
> aluminum label and the later (for the 18V engines) had a blue on aluminum
> label. He also stated that he thought the earlier version was a 3 synchro
> and not a 4 synchro model. He was not sure if the earlier version would
> properly mate with a later 18V engine (which is what I have) and
> suggested asking the list. What's your opinion?
> Bill Snyder
> 66 MGB
> 72 MGB-GT
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