First, I would at least inspect it before starting to rebuild it. Make sure it
is necessary.
There is a finite risk of damaging, losing, or otherwise ruining part or all of
the gearbox during a rebuild.
You would probably need new synchros, a rear oil seal, and at least the input
shaft ball bearing.
Needles for the countershaft bearings are also a good thing to get.
You should definitely get TWO of the special snap rings that hold the stuff on
the mainshaft.
NEVER re-use this snap ring!
And gaskets, of course.
But I think it is better to inspect and disassemble before ordering parts,
otherwise you will
either have wasted money buying unnecessary stuff, or have to make a second
order for more stuff.
Also, you may be able to mix and match parts from your old and new gearbox.
BTW, I find it very unlikely that adding GL-5 oil will suddenly cause both
synchros to fail.
But if that is all that is wrong with the old gearbox, why not simply rebuild
it instead of
getting and rebuilding a different one? At least take it apart for a
post-mortem and
for practice...
Doug Braun
'72 Spit
At 04:05 PM 2/12/2004 -0800, you wrote:
>Hi Everyone,
>
>Well, first things first...I think I found out why
>both 2nd and 3rd gear synchros went at the same time
>on my gearbox. When I replaced my clutch, I refilled
>my gearbox with GL5-rated oil...and as I've found out,
>that will deteriorate the brass and bronze in these
>old Triumph gearboxes fairly quickly.
>I've purchased a good used 3-rail 4-synchro gearbox
>from a '71 Spitfire MkIV. As a matter of course, I've
>decided to rebuild it before I drop it in my '70 Mk3.
>I haven't received it yet, so I don't know if it needs
>anything beyond ordinary service items for the
>rebuild. Is there a standard list of items one would
>buy before embarking on a rebuild?
>
>Thanks!
>
>Adam
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