The power Drive dose ZERO for the trans load.

> Is there a lock-up convertor for the 425?

There may be one that fits but the question is how would it be actuated!.??

Rick Michelhaugh, ME
--
1974 26' Canyonlands
aka "The General"
Clinton, TN
 
Sorry but no it doesn't matter if the torque converter locked or stalled. the numerically higher final drive reduces the torque on all transmission
components.

Rick M.

> Agreed totaly as long as the converter is locked, stalled, hydraulically combined (how ever you want to say it).....if your converter is not
> stalled the whole deal changes.
>

> > Gentlemen,
> >
> > Lets think about the torque from the other end.
> >
> > Torque requirements at the output of the final drive is the same for pulling a grade at speed X or accelerating at Y Gs no matterqq what
> > gearing is where in the transaxle. (F=ma)
> > Agreed?
> >
> > With a numerically higher final drive the torque on the output shaft reduced for the needed torque requirement. Period. Therefore the torque
> > on the gearset part of the transmission is reduced.
> > If you use the standard final drive and change the chain drive ratio, the torque on the gearset portion of the transmission is higher.
> >
> > Rick Michelhaugh, ME

--
1974 26' Canyonlands
aka "The General"
Clinton, TN
 
Does anyone have a power drive unit for sale?

Bob
--
Bob Broadwell
75 Eleganza II-Rebuilt performance engine, Manny trans, Manny 1-ton front end, 73 23ft with a side bath getting some updates-both living in Las Vegas
 
> > Is there a lock-up convertor for the 425?
>
> There may be one that fits but the question is how would it be actuated!.??
>
> Rick Michelhaugh, ME

Manny worked on that problem a number of years ago. I asked him about the possibility of a lock-up converter. He said it could be done using a Switch
pitch transmission. Would no longer have the SP option, but the lock-up instead. He gave up on the issue realizing that there wasn't enough to gain.
He felt that the TH 425 when rebuilt properly, with the properly set up converter would not gain enough to make it worth the trouble. JFWIW
--
Larry
78 Royale w/500 Caddy
Menomonie, WI.