New gears (final drive)

[darren paget]

Hi Arch. When I talked to Jim Kanomata in Rayne, he said that the mileage
shouldn't change, or at least, be minimal. I still am trying to decide what to
change first. Go to the four bag system or change to the 3.55 that Jim sells.
Darren

> GMCers
>
> I do not want to start a fire storm but I do have a question. Has anybody
> put in different gears and got better mileage? If so what did you put in?
> I honestly thought some of the new gear ratios would have lead to better
> mileage. I honestly cant say that I have heard that they do. Just looking for
> info not a fight.
>
> Take Care
> Arch 76 GB IL

- --
Darren Paget
76 Experimental
Another Fab Day
http://www.TZEplus.com

 

[bob mclaughlin]

Arch,
I'm with you on the gear ratio change. I don't think it's needed. The 3.07
seems real flexible to me and, quite frankly, the 4.6 ratio I get with
shifting to second doesn't provide all that much more get up and go. It's
nice for climbing those 45 mile and hour hills without overheating but it
takes a set amount of horsepower to travel at any particular speed, incline
and wind condition regardless of your gear ratio. That's the biggest
determinant of gas mileage.
Bob McLaughlin

- -----Original Message-----
From: owner-gmcmotorhome
[mailtowner-gmcmotorhome]On Behalf Of Gcbr
Sent: Saturday, May 13, 2000 10:39 PM
To: gmcmotorhome
Subject: Re: GMC: New gears (final drive)

In a message dated 05/13/2000 10:03:17 PM Central Daylight Time,

> Hi Arch. When I talked to Jim Kanomata in Rayne, he said that the mileage
> shouldn't change, or at least, be minimal. I still am trying to decide
what
> to
> change first. Go to the four bag system or change to the 3.55 that Jim
sells.
>
Darren

Well, if there is no mileage change then this project has mover way down
on my list of things to do. I know some of you have stated that you can
now get away from a stop sign much faster. Well, after 5 years of driving
a 2.2 liter engine pulling a 6000 pound motorhome this 455 feels real strong
to me. Heck I can spin the wheels on my gravel driveway if I am not careful.

Take Care
Arch

 

[james bolick]

Arch asked: Has anybody put in different gears and got better mileage? If
so what did you put in? I honestly thought some of the new gear ratios
would have lead to better mileage.

I put in Marvin Peck's 3:46 gear 5 years ago, no increase in gas mileage, I
just get up and over the mountains faster.

Jim Bolick
'73 Painted Desert