I'm afraid I'll have to disagree with the first paragraph of
your post.
The overdrive unit is connected to the transmissions OUTPUT
shaft, not the input shaft. The pump you speak of has no relationship
to engine speed or transmission INPUT shaft speed. It is however
DIRECTLY related to the transmissions OUTPUT shaft speed. As we all
know, the output shaft is connected via the drive shaft to the rear end.
Therefor, it's the forward movement of the vehicle which operates this
pump. As long as the car is moving forward at an adequate speed, there
will be fluid pressure to engage the overdrive unit.
Rich
> ----------
> From: Rootes2(at)aol.com[SMTP:Rootes2(at)aol.com]
> Sent: Tuesday, April 29, 1997 3:32 PM
> To: alpines(at)autox.team.net
> Subject: Re: Engaging overdrive
>
> 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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