There is nothing wrong with the 4-synchro transmission (as you noticed), but
I don't understand why your mechanic is so sure that a used 4-synchro unit
will be so much more reliable than a used 3-synchro unit. While the early
unit has some known weaknesses, unless you do a rebuild you have no
assurance of longevity either way.
I believe simply replacing the 1st gear layshaft (or something like that) is
supposed to greatly improve the longevity of a used 3-synchro unit, while
still less involved than repairing the substantial damage that your current
unit has apparently suffered. I sympathize with your desire to keep things
original, and perhaps this could be a feasible middle course.
I went from 3-synchro to 4-synchro in my B, but only because I found an OD
tranny at a time when the engine was already out of the car. The best part
of the deal (besides the OD) is the new pre-engaged starter; the worst part
is that now I can't buy a carpet kit that fits the tunnel.
on 9/1/01 11:46 AM, jmc at firstname.lastname@example.org wrote:
> My 3-synchro transmission is near death. The pro says the only choice is
> a transplant. His suggestion: a 4-synchro OD unit. Rebuilding the current
> unit isn't worth it when you add up the parts and time. Swapping it out
> with another 3-synchro doesn't make sense either since I'll just end up
> in the same place a few years from now. But I prefer the 3-synchro for
> aestetic reasons (keeps the appearance original) and the fact that the
> shifter falls in a more comfortable position. But he had me check out
> another B that underwent the conversion and, I'll got to tell you, it was
> not as uncomfortable as I remember and the shifter felt silky smooth. I
> could get used to that. What is the collective judgement of the list?
> What are the pros and cons? Anyone make the switch and wished they could
> go back? And finally, If I decide to go that route, anyone have a
> 4-synchro OD transmission they'd like to part with? Thanks in advance for
> your sage advice.
> 67 MGB Roadster
> Now making loud can't-hear-the-radio noise in first, if I can get it into
'66 MGB GHN3L76149
If you're near Mountain View, CA,
it's the red one with the silver bootlid.
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