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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