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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