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<DIV>I have been using Valvoline VR1 Racing Oil 20w-50 in the engine of my ‘62
TR4 for several years and am now considering changing to Lucas Hot Rod and
Classic 20w-50. Does anyone have any opinions on the two oils and which one may
be more appropriate for a TR4? There appears to be more zinc and phosphorous in
Lucas and also possibly more corrosion protection.</DIV>
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<DIV>BTW several years ago I swapped out my original non overdrive transmission
in my TR4 for a TR6 overdrive one. Shortly thereafter I started having
intermittent shifting problems. I would attempt an up or down shift and found I
couldn’t get past neutral. I got several suggestions for the cause of the
problem from list members. The one that seemed the most likely to me based on
the symptoms I was experiencing was a problem with the shift interlock
mechanism. To confirm the diagnosis I replaced the top cover on the overdrive
transmission with the top cover from my original non overdrive transmission. I
expected the problem to go away. This top had given me zero problems in many
miles of use on the original transmission . The shift problem continued,
however, with this top on the overdrive transmission. I had trouble accepting
that the problem wasn’t in the top. I tried two more tops. They all failed in
the same way. I pulled the overdrive transmission and reinstalled the original
transmission. </DIV>
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<DIV>After pulling the transmission, it appears the problem is caused by the
reverse gear operating lever fulcrum pin (part 106448) that is threaded into the
inner side of the transmission case. It was threaded out too far and appeared to
be intermittently causing the reverse shift assembly to interfere with the shift
mechanism for the forward gears, causing the interlocks to activate . I’m
confident this will resolve the problem but I have not yet reinstalled the
overdrive transmission in the TR4. </DIV>
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<DIV>If anyone has a similar problem, it’s worth checking that pin to be sure
it’s within spec. Several members had asked me to let them know when ever I
discovered what the problem was. It’s been a long saga. </DIV>
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<DIV>If you have any views on the engine oils, please let me know.</DIV>
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<DIV>Thanks,</DIV>
<DIV>John </DIV>
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