A-Type solenoid is verticle & the J-Type solenoid is horizontal & both are
externally located on the driver side(lhd). Were the J-Type installed in an
early frame, the driver side(lhd) tranny mount would have to be cut back
slightly to make room for the solenoid(ask me how i know)
Todd
cd3705l
http://home.fuse.net/tristatetriumphs
>From: Timothy Holbrook <tjh173@yahoo.com>
>Reply-To: Timothy Holbrook <tjh173@yahoo.com>
>To: Timothy Holbrook <tjh173@yahoo.com>, 6pack@autox.team.net
>Subject: Re: Fwd: Re: Which overdrive A or J?
>Date: Tue, 10 Dec 2002 17:51:50 -0800 (PST)
>
>Typo in this email, sorry! The RELAY was only used on A types, as Todd
>stated. A SOLENOID is used on both units, but the J-type solenoid is
>(I believe) hidden inside the overdrive unit, whereas the A type
>solenoid is mounted on the side of the overdrive unit.
>
>The relay was used on the A type because the solenoid pulls a lot of
>amps during initial overdrive engagement, whereas the J type solenoid
>pulls less amps, so there is no relay needed.
>
>Both A and J type cannot be engaged when the gearbox is in reverse, or
>something will break.
>
>Sorry for the confusion!
>
>Tim Holbrook
>1971 TR6
>
>
>--- Timothy Holbrook <tjh173@yahoo.com> wrote:
> > Both A and J type don't like to be engaged on reverse gear (this is
> > prevented by the switches on the gearbox cover). Engaging overdrive
> > while in reverse gear will apparently break the gearbox casing. The
> > relay on the A type is used to engage the overdrive. There is one on
> > the J type too, but it is smaller and I believe it's within the
> > overdrive unit, rather than outside as on the A type.
> >
> > Tim Holbrook
> > 1971 TR6
> >
> >
> > --- Todd Bermudez <red_tr250@hotmail.com> wrote:
> > > From: "Todd Bermudez" <red_tr250@hotmail.com>
> > > To: rdowty@dowtyenterprises.com, 6pack@autox.team.net
> > > Subject: Re: Which overdrive A or J?
> > > Date: Mon, 09 Dec 2002 06:23:25 -0500
> > >
> > > Ron,
> > >
> > > I think you have some things backwards:)
> > >
> > > Either of the o/d trannys are bolt in. No frame mods have to be
> > > done. The
> > > early frames need to be modified to accept the j-type tranny as the
> > > frame
> > > mount is about 2" fwd of the later frame. The a-type allows o/d in
> > > 2nd,
> > > 3rd, & 4th & often it is said to be more robust, but it is getting
> > > harder to
> > > find & less reliable(so i'm told). The j-type allows o/d in 3rd &
> > > 4th &
> > > more reliable(so i'm told). The wiring is similar for both,
> > however
> > > the
> > > a-type required a relay. Reverse is no good for an a-type!
> > >
> > > I've managed to put a j-type in my TR250 with the help of a bracket
> > > from
> > > Rimmer, but again you won't need that on the late frame.
> > Everything
> > > you'll
> > > need you should already have with the existing tranny mount. Don't
> > > throw
> > > that stuff away!
> > >
> > > Good luck,
> > >
> > > Todd
> > > CD3705L
> > > http://home.fuse.net/tristatetriumphs
> > >
> > >
> > >
> > >
> > >
> > >
> > > >From: "Ronald A. Dowty" <rdowty@dowtyenterprises.com>
> > > >Reply-To: "Ronald A. Dowty" <rdowty@dowtyenterprises.com>
> > > >To: <6pack@autox.team.net>
> > > >Subject: Which overdrive A or J?
> > > >Date: Mon, 9 Dec 2002 04:00:16 -0600
> > > >
> > > >I am currently working on my 76' TR6 to be finished by Spring if I
> > > keep
> > > >hurrying. The rolling chassis should be done tomorrow and I have
> > all
> > > the
> > > >replacement panels bought if not installed on the body. The engine
> > > is
> > > >also ready. One of the two things I need are an overdrive and AC.
> > > I'll
> > > >ask the AC question later. I'm waiting for a guy named Roger
> > Bollick
> > > to
> > > >finish his article on installing one using Vintage Air parts. As
> > for
> > > the
> > > >overdrive I realize the J type was correct for my car but it was
> > > >originally a non overdrive car so the frame brakets need to be
> > > modified
> > > >where as the A type is mostly a drop in. The question is which is
> > > >better. I think the A type works in 3 and 4th gears and the J type
> > > only
> > > >works in 4th where I'd probably use it. I was going to keep
> > watching
> > > >eBay for a few months and if I could get one reasonably I was
> > going
> > > to
> > > >pick it up. I have a 70 parts car and a working non-overdrive
> > > >transmission from it as well as the one from the 76. I'm not super
> > > >worried about having a J because I have a later car. I'm buiding a
> > > daily
> > > >driver and I want it to have the best of both worlds like an early
> > > head
> > > >(actually my later one is just shaved to 9.5:1) and earlier
> > bumpers
> > > but
> > > >with some of the later improvements like the brake pistons (which
> > > are
> > > >usually upgraded on rebuilds).
> > > >
> > > >So which is better and why? I've never had an overdrive but the
> > > speed
> > > >limits here are about 20 MPH faster than the last time I drove my
> > > baby.
> > > >I need to be able to cruse at 70 just to drive from one side of
> > town
> > > to
> > > >the other on the bypass.
> > >
> > >
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