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| Re: [GMCnet] Power Drive [message #327193 is a reply to message #327192] |
Sat, 16 December 2017 23:26   |
James Hupy
Messages: 6806
Registered: May 2010
Karma:
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Senior Member |
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The TM 425 was originally designed to move a 4000 pound car. We are asking
it to move a 12,000 pound motor home. The same old formula, F x D = Torque
applies in both situations. The motor home is at a three to one
disadvantage weight wise to the cars. Thus, the power drive and different
gearing in the final drives. Manny T sells the power drive and builds
transmissions too. Good guy, knows his stuff. Good friend to the whole GMC
community. The power drive is hell for strong, like the rest of the TM-425.
I wouldn't worry about it.
Jim Hupy
Salem, Or
78 GMC ROYALE 403
On Dec 16, 2017 8:53 PM, "Bill Wevers" wrote:
> Sounds like you have a good set-up.
> Most people prefer final drive ratios between 3.50 and 3.70.
> The power drive is equivalent to having 3.50.
> The 3.21 will bump it up to 3.66 equivalent.
>
> With the 3.07 gears, the carburetor power enrichment circuit
> kicks in a lot because of the low manifold vacuum.
>
>
>
> --
> Bill Wevers GMC49ers, GMC Western States
> 1975 Glenbrook - Manny Powerdrive, OneTon
> 455 F Block, G heads
> San Jose
>
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