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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>
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