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A type vs. J type overdrive

To: "Bob Rochlin" <r_rochlin@hotmail.com>
Subject: A type vs. J type overdrive
From: David Massey <105671.471@compuserve.com>
Date: Wed, 9 Jan 2002 07:39:42 -0500
Cc: "Triumphs" <triumphs@autox.team.net>
Message text written by "Bob Rochlin"
>    A couple of questions about overdrive I'd like to submit to the list:
1. Are A type overdrives and parts much harder to come by then J types?

2. Can the non-overdrive transmission remote control tops be drilled and
tapped for the inhibitor switches for either type of overdrive?

3. Are either type of overdrive tricky to overhaul?

4. Is it difficult to fabricate the transmission tunnel covers required for
an
overdrive transmission?
<

1)  I don't know.  What little parts shopping I've done has shown no
difference.

2) Yes.  I did this very same thing.  BTW the threads are metric (Don't ask
me what the thread is, I just took the cover and the switch to a machine
shop and he took care of it.  Just be aware that not all machine shops have
the metric taps.)

3) The two are about the same.  The J-type is a bit more simple.  The pump
is different and the there is no accumulator and there is no solenoid
adjustment.  But they both have the same tricky spline alignment issue -
that is the splines for the sun gear and the one way clutch must be aligned
before assembly.  If you can handle one the other will feel quite familiar.

4) No need.  The overdrive transmission will fit under a stock tunnel.

Cheers and good luck

Dave

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