Re: 727 to 518 swap...

[farna@xxxxxxx]

On July 20, 2005 Jim B wrote:

> A: The A500 is not terribly strong stock, but can be modded somewhat. (Jim
> Mantle knows a lot more about that than I do. Especially since I haven't
> done any Mopar trans rebuilding in almost 20 years) I was thinking maybe the
> 5 or 6 speed version of the Lexus AW trans, IF the Jeep AW4 bellhousing fit.
> A few other ideas came to mind. An adapter plate to use a Jeep Aw4 bell on a
> Chev O/D trans (like 700R4) or the Buick nailhead trans adapter for AMC. How
> about an adapter plate and valve body to attach the tailstock of the 518 to
> a 727 (with correct valving tubes built in)?

Yeah, there is an adapter from Advance Adapters for a Chevy trans to AMC engine. I don't know how Lexus gets 5 or 6 speeds -- there has to be a different valve body and I would think gearing. The AW4 isn't a three speed with OD added to the back -- it's a four speed trans with fourth gear having a high ratio. At least it is shifted that way -- there is no way to "add" OD to a lower gear in the Jeep valve body. It may be constructed as a three speed with an additional planetary set for OD, I haven't looked that close at the specs. Or Lexus could use a looser torque converter and use lock-up as another "gear". 

The trans controller is built into the engine computer on 96 and later models. Using a Toyota controller has other problems than just the likelyhood that they are built into the engine controller. The Supra version I looked at had an electronic gizmo (probably a stepper motor?) in place of the TV cable. Obviously it was computer controlled. The separate controller may be an 87-95 Jeep exclusive. 

I like the tailstock adapter idea, but I'm willing to bet there is n demand since it would really only affect AMC people. Mopar guys can swap the 518 in directly, of course. 

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