| [GMCnet] MPG with 3.7 gear ratio (403 engine, hilly conditions) [message #172599] |
Fri, 08 June 2012 14:44  |
Ek_Lektro
Messages: 167
Registered: March 2011
Karma:
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Senior Member |
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Maybe i should've used a different subject title for my post,
since it seems to have sparked the 'ole MPG thread... and making sure we're all grounded in reality :)
Even though a particularly trusted GMC mechanic had made the claim that one could get
12 to 14MPG with a 403 / 3.7 combo... I surely wasn't banking on this... though it DID spark my curiosity.
But this was only one part of the inquiry...
I was also checking into the much more serious financial concern
of keeping the transmission alive! ('cause if you do the math,
an extra 1 or 2 MPG would take a LOT of miles to pay for a tranny rebuild...
And... being able to climb hills more like my 455...
well, that'd be a hell of a bonus....
So i'm considering going from a 3.07 to a 3.55 as a bit of a happy medium,
and since 3.55's seem to be more readily available at OK prices.
Any words of advice against the 3.55??
Thanks Ray and Roy, and everybody for your replies...!
Greg
PS: we might not have much to brag about in terms of MPG,
but our solar array is recharging last night's usual battery drain
at 35amps right now... in the clouds!
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> I lived in the LA area for 35 years.I generally tow a boat or a car. In the early days it was always a boat. When I went from the 3:08 gears to 3:21 I picked up better fuel mileage and more pulling power. When I changed to 3:70 gears the mileage stayed about the same but the pulling power was even better. Now that I live in an even bigger Mountain state I'm sure the 3:70 gears would give an increase in fuel mileage over the 3:21 gears. It is no fun to be in low gear going 10 miles an hour an knowing if the pass gets any steeper you ain't going to be able to get over the top.
> --
> Roy Keen
> Minden,NV
> 76 X Glenbrook
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