OK, I'll add my 2p worth -
The most important thing to remember about the Laycock overdrive is
that it is hydraulically operated - it NEEDS to have the input shaft driven
in order to operate the pump! If you declutch on the upshift, you risk losing
oil pressure in the trans, and a slow engagement that is harmful to the
internal clutch surface.
On this same subject, when it comes to lubricants, you should avoid
ANY additives, hypoid oils, synthetics, and even most multi-weights. The
planetary gears of the overdrive spin like a centrifuge, and will separate
out many additives. I have used a straight 20 or 30 detergent oil for the
past 10 years, and so far, no ill effects.
And by the way, I do not use the clutch for upshift, and find that I seldom
need to downshift to 4th - usually I need to slow down more than that, so I
use the clutch, and move out of the 3-4 gate to deactivate the OD.
Jon Arzt Rootes2(at)aol.com
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