| Re: [GMCnet] ~ Final Drive ~ [message #222395] |
Sat, 14 September 2013 09:43 |
Ray Erspamer
Messages: 1707
Registered: May 2007
Location: Milwaukee Wisconsin
Karma:
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Senior Member |
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Good Morning
Not sure if my new tach is calibrated correctly, but with the 403 & 3:70 last night on the way to our destination at 70 mph the tach said 4000 rpm. Seems high to me but the ole 403 seemed to like it and just purr'd along. I will check it with another tach when we get back. Thoughts on the 4000 rpm? I run the larger 245 tires so my 3:70 is more like a 3:55.
Ray
Sent from my Galaxy S®III
-------- Original message --------
From: Matt Colie <matt7323tze@gmail.com>
Date: 09/14/2013 8:18 AM (GMT-06:00)
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] ~ Final Drive ~
A Hamilto wrote on Thu, 12 September 2013 22:21
> Matt Colie wrote on Thu, 12 September 2013 19:46
> > ... from what I know, I would have to think that a 403 would love a 4.10. That would put road speed in the middle of the only 403 torque curve I have ever seen. ...
> What's "road speed"?
A,
Road speed is a term used loosely in automotive engineering to describe the velocity of a particular vehicle in its expected service. One would not use the same design speed for a Corvette that one might use for a C3500 chassis.
For most of us with old GMCs, road speed is probably 60~65, but if you have a twin turbo Cadillac, it might just be 80~85 and in that case, I thing a high numerical final drive might be ill-advised.
Matt
--
Matt & Mary Colie
'73 Glacier 23 Chaumière (say show-me-air)
Now with 4 working Rear Brakes
SE Michigan - Twixt A2 and Detroit
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Ray Erspamer
78 GMC Royale Center Kitchen
403, 3.70 Final Drive
Holley Sniper Quadrajet EFI System,
Holley Hyperspark Ignition System
414-484-9431
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