| Re: [GMCnet] Powerglide [message #230600] |
Thu, 21 November 2013 01:29 |
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hnielsen2
Messages: 1434
Registered: February 2004
Location: Alpine CA
Karma: 0
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Senior Member |
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Terry
I run 3:70's in the final drive pulls the grades very well.
First time coming out of Denver on I-70 west bound up to the Eisenhower tunnel I think I could have walked faster.
The Eisenhower tunnel is at just over 10,000 feet.
We had stock 3:07 with a messed up Rochester carb.
Next trip 3:70 and Howell TBI up to the tunnel at 55 MPH.
As for gas mileage I can't tell the difference.
I think it's about the same?
As the bumper sticker reads "Life is not about the MPG's"
Thanks
Howard
Alpine Ca
74 Canyon Lands
Not quite stock.
All is well with my Lord
> On Nov 20, 2013, at 22:08, Terry <mrbullitt@verizon.net> wrote:
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>
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> I'm pretty sure the PO did not change the diff, so it probably has the 3.07 in there. Don't the 3.70s cut the mileage a little? I like the low RPM torque of the 455 and it's quiet going down the road. When I get it raised up again I will look for the tag on the cover (if it has one). I was hoping for a governor modification or possibly a fluid additive. I've used the Lucas ATF additive in Fords and Chryslers with surprisingly good results in increased power transfer and shift timing improvement. It also slowed down a leak at the shift shaft where the seal was stiff from an exhaust leak heating it up. Haven't needed to try it in any GM transmissions yet.
> --
> Terry Kelpien
> 73 Glacier 260
> Smithfield, Va.
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