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| Re: [GMCnet] Power Drive [message #327194 is a reply to message #327193] |
Sun, 17 December 2017 00:05   |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma:
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On Sat, Dec 16, 2017 at 9:27 PM James Hupy wrote:
> 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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>> why don't you go back to 3.07 then tell me your experience.
some have done that but too proud to admit the mistake.
All the RV units that use chassis from suppliers run 4.11 /4.55 using the
same wheel and tire.GM , Ford and Chrysler know more than us
>
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> B
--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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