Re: [AMC-list] M12 Trany

[Keith Evenson <epd@xxxxxxxxxxxx>]

Does anybody know what the stall speed would be on a factory M12? I  
have an 1800 on my 727.

Later, Keith



On Jan 13, 2010, at 10:00 AM, wrambler242@xxxxxxxxxxx wrote:

> My thoughts exactly.
> If the 390 is built to run in higher rpms and the converter is stock  
> it could be a case of miss matched parts.
>    May need to change the cam or converter. How do the dyno torque  
> numbers compare on the bottom end?
> Sent from my BlackBerry® wireless device from U.S. Cellular
>
> -----Original Message-----
> From: Ken Ames <ameskg@xxxxxxxxx>
> Date: Tue, 12 Jan 2010 22:58:24
> To: <epd@xxxxxxxxxxxx>; AMC, Rambler, Nash,Jeep and family<amc-list@xxxxxxxxxxxx 
> >
> Subject: Re: [AMC-list] M12 Trany
>
> AFAIK the M-12 has a 2.40:1 1st and 1.47:1 2nd gear.
>       The 727 has a 2.45:1 1st and 1.45:1 2nd gear.
>
> Aside from a difference in the stall speed on the converter (if any)  
> the other
> reasons for the quality of the launch could be the ignition and  
> carburetor
> setups. Although the AMX has higher power numbers, the low rpm power  
> could be
> off, accelerator pump could be bad, etc.
>
> Ken
>
>
> Quoting epd <epd@xxxxxxxxxxxx>:
>
> > In my 68 AMX I have the original M12 trany and in my 70 Jav.
> > I have a 727 and I am wondering what the differnce in the
> > gear ratio between the two is. My AMX has a rebuilt 390
> > putting out 380 hp and 470 trq. My Javelin has a rebuilt 360
> > putting out 325 hp and 380 trq. They both have twin grip
> > rear ends with 315 gears and in the Javelin I could burn the
> > tires off of it but with the AMX sometimes it kind of bogs
> > down and wont even break them loose. I am wondering if it
> > could have anything to do with the trany.
> >
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