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<p>It's not uncommon to get problems selecting reverse or 1st, but
lifting the clutch then trying again (if nudging towards 1st or
2nd doesn't work) has worked for me on two cars over 30 years.
Not had a problem selecting 3rd or 4th ... but then I rarely do
that at a standstill! If the engine isn't running then you _can_
get failure to get it into any gear, or maybe have to try and
select all of them before things move enough.<br>
</p>
<p>Is it grinding when trying to select reverse but won't go in? If
so that's the clutch. That can also prevent selection of forward
gears but without grinding.<br>
</p>
<p>Have there been any problems getting it out of gear once it has
gone in? Any unpleasant noises when you have selected a gear and
are driving? If not then selector problems and gear set problems
are perhaps unlikely. Also if the problem is with all the gears
as you say i.e. all the fore and aft movements into reverse,
1st/2nd, and 3rd/4th then again selector problems seem less likely
as there are three separate rods and forks. The only common
points are where the remote extension engages with the three rods
which is accessed from the top of the gearbox i.e. a gearbox out
job. There is also an interlock plate which in that area which
engages with that end of the selector rods and I think prevents
more than one gear being engaged at a time.</p>
<p>I can understand the problem coming and going with the clutch if
sometimes the master cylinder is failing to pressurise the fluid
and move the slave piston, more so than something having come
loose inside the gearbox, with the possible exception of that
interlock plate.</p>
<p>PaulH.<br>
</p>
<div class="moz-cite-prefix">On 23/09/2024 23:09, S.Carr wrote:<br>
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<p class="MsoNormal"><span class="DefaultFontHxMailStyle"><span
style="font-size:12.0pt">My ’71 B/GT has suddenly
developed a gearbox problem—intermittently it will not go
into </span></span><span class="DefaultFontHxMailStyle"><u><span
style="font-size:12.0pt">any</span></u></span><span
class="DefaultFontHxMailStyle"><span
style="font-size:12.0pt"> gear, whether the engine is
running or not. A few minutes later it will work
normally, then later refuse to shift again. Any idea
where we should look for the cause? We assume the side
plate will have to come off. We need to fix the problem,
as I want to put the car up for sale before winter sets
in----<o:p></o:p></span></span></p>
<p class="MsoNormal"><span class="DefaultFontHxMailStyle"><span
style="font-size:12.0pt">Sarah Carr<o:p></o:p></span></span></p>
<p class="MsoNormal"><span class="DefaultFontHxMailStyle"><span
style="font-size:12.0pt">’71 B/GT in PA<o:p></o:p></span></span></p>
<p class="MsoNormal"><span class="DefaultFontHxMailStyle"><span
style="font-size:12.0pt"><o:p> </o:p></span></span></p>
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