| [GMCnet] Final Drives [message #360385] |
Sun, 29 November 2020 21:30  |
BobDunahugh
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
Karma:
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Senior Member |
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I'll break my silence for this one. All trucks that had a GVW over 10,000 LBS back then. Had 3:70, 4:10, or 4:56 differentials. To reduce the load on the engine/trans. The GMC motor home was in the luxury group. They wanted to reduce sound in any way possible. Yes. There is a little more drivetrain sound. So, I added some extra sound barrier.
Now the sound is lower than with the 3:07. I treat our GMC like Apollo 13. Failure is NOT an option. I'm for increasing longevity. I personally rebuilt my trans in 2004. That same transmission is now in our present 78 Royale. With about 140,000 miles on its clock.18 years. Never been towed. 403 that is always pulling a GVW from 17,000 to 24,000 LBS GVW. Yes. Even in the mountains out West.
Reality is. You'll be running a higher vacuum. Thus, better mpg's. Plus, less load on the engine/trans. The engine will have more coolant going to the radiator. The trans will run cooler. Because there will be more trans fluid going to be cooled. That's what I have out here on the great plains. Love it.
I'll go back to my hole now. Hope that all of you have a better 2021. And remember. You can't tell those around you. That you love them too many times a day.
Bob Dunahugh
78 Royale sense 2003
4 COPO Yenkos, and way too many convertibles.
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