Bill-

I have an '03 TJ Sport (I6 w/30" Tires) with 3.73's. I average about
19 MPG, and have done so since new. I drive the s*it outta my rig
too, 48K miles in less than 2 yrs (purchased in 11/02).

I am like you and I don't do any really heavyduty off roading, but
when I want to find out where that logging road goes, I can without
any worries... It's my daily driver- 49 miles one way to the office
(I absolutely have to be able to get there- hence, the TJ). Although
I don't absolutely HAVE to start out in 1st gear, I just don't like to
feather the clutch that much in 2nd... I think you'll find the 3.73's
to be superior to the 3.07 for overall performance. 5th gear doesn't
have a lot of "pull" (it's not gonna snap yor head back ;-)) but it
holds it's own on hills pretty well.

My $0.02.

John


Mike Romain <romainm@sympatico.ca> wrote in message news:<4141D767.D7654D8A@sympatico.ca>...
> That figures. They don't care that 5th is only good with a tail wind as
> long as the mpg go down eh.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
> "L.W.(ßill) ------ III" wrote:
> >
> > Hi Bill,
> > The only reason for the three to one gear ratio is SMOG compliance,
> > in an attempt to get better gas mileage ratings, but because the engine
> > must work so... much harder to maintain traffic speeds it fails badly on
> > highway ratings, too. Dream wheels are at:
> > http://www.mysporttrac.net/calulator.htm
> > God Bless America, ßill O|||||||O
> > mailto:-------------------- http://www.----------.com/
> >
> > Bill Donovan wrote:
> > >
> > > Does anyone have any info on the difference in speeds at a given RPM (or
> > > vice versa) for each gear for the 3.07 vs the 3.73 axle.
> > >
> > > Also any comments re the the pros/cons of each would be appreciated.
> > >
> > > Thanks.
> > >
> > > Bill Donovan

 

Bill-

I have an '03 TJ Sport (I6 w/30" Tires) with 3.73's. I average about
19 MPG, and have done so since new. I drive the s*it outta my rig
too, 48K miles in less than 2 yrs (purchased in 11/02).

I am like you and I don't do any really heavyduty off roading, but
when I want to find out where that logging road goes, I can without
any worries... It's my daily driver- 49 miles one way to the office
(I absolutely have to be able to get there- hence, the TJ). Although
I don't absolutely HAVE to start out in 1st gear, I just don't like to
feather the clutch that much in 2nd... I think you'll find the 3.73's
to be superior to the 3.07 for overall performance. 5th gear doesn't
have a lot of "pull" (it's not gonna snap yor head back ;-)) but it
holds it's own on hills pretty well.

My $0.02.

John


Mike Romain <romainm@sympatico.ca> wrote in message news:<4141D767.D7654D8A@sympatico.ca>...
> That figures. They don't care that 5th is only good with a tail wind as
> long as the mpg go down eh.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
> "L.W.(ßill) ------ III" wrote:
> >
> > Hi Bill,
> > The only reason for the three to one gear ratio is SMOG compliance,
> > in an attempt to get better gas mileage ratings, but because the engine
> > must work so... much harder to maintain traffic speeds it fails badly on
> > highway ratings, too. Dream wheels are at:
> > http://www.mysporttrac.net/calulator.htm
> > God Bless America, ßill O|||||||O
> > mailto:-------------------- http://www.----------.com/
> >
> > Bill Donovan wrote:
> > >
> > > Does anyone have any info on the difference in speeds at a given RPM (or
> > > vice versa) for each gear for the 3.07 vs the 3.73 axle.
> > >
> > > Also any comments re the the pros/cons of each would be appreciated.
> > >
> > > Thanks.
> > >
> > > Bill Donovan

 

"Jerry Bransford" <jerrypb@***.net> wrote in message news:<L7s0d.81286$yh.30792@fed1read05>...
> Jeff, it sure reads like you're reversing how a 3.73 vs. a 3.07 would be
> described by anyone I know.
>
> Jerry
> --
> Jerry Bransford
> PP-ASEL N6TAY
> See the Geezer Jeep at
> http://members.***.net/jerrypb/
> "Jeff" <budda66f@aol.com> wrote in message
>
Maybe I am Jerry. But I know the 3.07 had a lot of top end
left in fifth gear and it would fly on the highway. The 3.73's made
my jeep feel peppy at low speeds. I think this is how it's supposed
to work. Am I way off?

Maybe the tire sizes had a lot to do with it as well. But my same
travel when I got my Dana 44/3.73 TJ required a lot more trips to the
gas station. I love it but it's a pig.

The 3.07 had those grizzly wheels and metric tires. They weren't the
real small ones, the medium sized factory tires. P29 or something, I
can't remember. I calculated
mostly highway MPG as almost 21 mpg! For a six banger that's good

 

"Jerry Bransford" <jerrypb@***.net> wrote in message news:<L7s0d.81286$yh.30792@fed1read05>...
> Jeff, it sure reads like you're reversing how a 3.73 vs. a 3.07 would be
> described by anyone I know.
>
> Jerry
> --
> Jerry Bransford
> PP-ASEL N6TAY
> See the Geezer Jeep at
> http://members.***.net/jerrypb/
> "Jeff" <budda66f@aol.com> wrote in message
>
Maybe I am Jerry. But I know the 3.07 had a lot of top end
left in fifth gear and it would fly on the highway. The 3.73's made
my jeep feel peppy at low speeds. I think this is how it's supposed
to work. Am I way off?

Maybe the tire sizes had a lot to do with it as well. But my same
travel when I got my Dana 44/3.73 TJ required a lot more trips to the
gas station. I love it but it's a pig.

The 3.07 had those grizzly wheels and metric tires. They weren't the
real small ones, the medium sized factory tires. P29 or something, I
can't remember. I calculated
mostly highway MPG as almost 21 mpg! For a six banger that's good

 

"Jerry Bransford" <jerrypb@***.net> wrote in message news:<L7s0d.81286$yh.30792@fed1read05>...
> Jeff, it sure reads like you're reversing how a 3.73 vs. a 3.07 would be
> described by anyone I know.
>
> Jerry
> --
> Jerry Bransford
> PP-ASEL N6TAY
> See the Geezer Jeep at
> http://members.***.net/jerrypb/
> "Jeff" <budda66f@aol.com> wrote in message
>
Maybe I am Jerry. But I know the 3.07 had a lot of top end
left in fifth gear and it would fly on the highway. The 3.73's made
my jeep feel peppy at low speeds. I think this is how it's supposed
to work. Am I way off?

Maybe the tire sizes had a lot to do with it as well. But my same
travel when I got my Dana 44/3.73 TJ required a lot more trips to the
gas station. I love it but it's a pig.

The 3.07 had those grizzly wheels and metric tires. They weren't the
real small ones, the medium sized factory tires. P29 or something, I
can't remember. I calculated
mostly highway MPG as almost 21 mpg! For a six banger that's good

 

When you switched to the 31s with your 3.73s (as I understood it you
were running smaller tires on the 3.73 axles before), did you adjust
your gas mileage comparison for the tire size difference? Because your
speedo and therefore trip odo will be off slightly...enough to hide
probably 2 or 3 mpg (depending on what your original tire size(s)
were).


budda66f@aol.com (Jeff) wrote in message news:<85392d89.0409140610.13a214eb@posting.google. com>...
> "Jerry Bransford" <jerrypb@***.net> wrote in message news:<L7s0d.81286$yh.30792@fed1read05>...
> > Jeff, it sure reads like you're reversing how a 3.73 vs. a 3.07 would be
> > described by anyone I know.
> >
> > Jerry
> > --
> > Jerry Bransford
> > PP-ASEL N6TAY
> > See the Geezer Jeep at
> > http://members.***.net/jerrypb/
> > "Jeff" <budda66f@aol.com> wrote in message
> >
> Maybe I am Jerry. But I know the 3.07 had a lot of top end
> left in fifth gear and it would fly on the highway. The 3.73's made
> my jeep feel peppy at low speeds. I think this is how it's supposed
> to work. Am I way off?
>
> Maybe the tire sizes had a lot to do with it as well. But my same
> travel when I got my Dana 44/3.73 TJ required a lot more trips to the
> gas station. I love it but it's a pig.
>
> The 3.07 had those grizzly wheels and metric tires. They weren't the
> real small ones, the medium sized factory tires. P29 or something, I
> can't remember. I calculated
> mostly highway MPG as almost 21 mpg! For a six banger that's good

 

When you switched to the 31s with your 3.73s (as I understood it you
were running smaller tires on the 3.73 axles before), did you adjust
your gas mileage comparison for the tire size difference? Because your
speedo and therefore trip odo will be off slightly...enough to hide
probably 2 or 3 mpg (depending on what your original tire size(s)
were).


budda66f@aol.com (Jeff) wrote in message news:<85392d89.0409140610.13a214eb@posting.google. com>...
> "Jerry Bransford" <jerrypb@***.net> wrote in message news:<L7s0d.81286$yh.30792@fed1read05>...
> > Jeff, it sure reads like you're reversing how a 3.73 vs. a 3.07 would be
> > described by anyone I know.
> >
> > Jerry
> > --
> > Jerry Bransford
> > PP-ASEL N6TAY
> > See the Geezer Jeep at
> > http://members.***.net/jerrypb/
> > "Jeff" <budda66f@aol.com> wrote in message
> >
> Maybe I am Jerry. But I know the 3.07 had a lot of top end
> left in fifth gear and it would fly on the highway. The 3.73's made
> my jeep feel peppy at low speeds. I think this is how it's supposed
> to work. Am I way off?
>
> Maybe the tire sizes had a lot to do with it as well. But my same
> travel when I got my Dana 44/3.73 TJ required a lot more trips to the
> gas station. I love it but it's a pig.
>
> The 3.07 had those grizzly wheels and metric tires. They weren't the
> real small ones, the medium sized factory tires. P29 or something, I
> can't remember. I calculated
> mostly highway MPG as almost 21 mpg! For a six banger that's good

 

When you switched to the 31s with your 3.73s (as I understood it you
were running smaller tires on the 3.73 axles before), did you adjust
your gas mileage comparison for the tire size difference? Because your
speedo and therefore trip odo will be off slightly...enough to hide
probably 2 or 3 mpg (depending on what your original tire size(s)
were).


budda66f@aol.com (Jeff) wrote in message news:<85392d89.0409140610.13a214eb@posting.google. com>...
> "Jerry Bransford" <jerrypb@***.net> wrote in message news:<L7s0d.81286$yh.30792@fed1read05>...
> > Jeff, it sure reads like you're reversing how a 3.73 vs. a 3.07 would be
> > described by anyone I know.
> >
> > Jerry
> > --
> > Jerry Bransford
> > PP-ASEL N6TAY
> > See the Geezer Jeep at
> > http://members.***.net/jerrypb/
> > "Jeff" <budda66f@aol.com> wrote in message
> >
> Maybe I am Jerry. But I know the 3.07 had a lot of top end
> left in fifth gear and it would fly on the highway. The 3.73's made
> my jeep feel peppy at low speeds. I think this is how it's supposed
> to work. Am I way off?
>
> Maybe the tire sizes had a lot to do with it as well. But my same
> travel when I got my Dana 44/3.73 TJ required a lot more trips to the
> gas station. I love it but it's a pig.
>
> The 3.07 had those grizzly wheels and metric tires. They weren't the
> real small ones, the medium sized factory tires. P29 or something, I
> can't remember. I calculated
> mostly highway MPG as almost 21 mpg! For a six banger that's good

 

No Bob, I just recently got the 31's last winter. I had my '98 since
winter of 97 and did these comparison of stock jeep vehicles.
3.07 w/ grizzlys vs. the 3.73 w/ 30" wheel package and Dana 44.

The 3.07 had way better mpg.

With the 30" wheel deal, the speedo was off from factory. That's how
it was back in '98. If you put BFG's 31" on, it's pretty much dead on
without changing a thing. Don't know how it is now.



magicclaw@mac.com (Bob) wrote in message news:<47b769ae.0409150544.7a9aeecf@posting.google. com>...
> When you switched to the 31s with your 3.73s (as I understood it you
> were running smaller tires on the 3.73 axles before), did you adjust
> your gas mileage comparison for the tire size difference? Because your
> speedo and therefore trip odo will be off slightly...enough to hide
> probably 2 or 3 mpg (depending on what your original tire size(s)
> were).
>
>
> budda66f@aol.com (Jeff) wrote in message news:<85392d89.0409140610.13a214eb@posting.google. com>...
> > "Jerry Bransford" <jerrypb@***.net> wrote in message news:<L7s0d.81286$yh.30792@fed1read05>...
> > > Jeff, it sure reads like you're reversing how a 3.73 vs. a 3.07 would be
> > > described by anyone I know.
> > >
> > > Jerry
> > > --
> > > Jerry Bransford
> > > PP-ASEL N6TAY
> > > See the Geezer Jeep at
> > > http://members.***.net/jerrypb/
> > > "Jeff" <budda66f@aol.com> wrote in message
> > >
> > Maybe I am Jerry. But I know the 3.07 had a lot of top end
> > left in fifth gear and it would fly on the highway. The 3.73's made
> > my jeep feel peppy at low speeds. I think this is how it's supposed
> > to work. Am I way off?
> >
> > Maybe the tire sizes had a lot to do with it as well. But my same
> > travel when I got my Dana 44/3.73 TJ required a lot more trips to the
> > gas station. I love it but it's a pig.
> >
> > The 3.07 had those grizzly wheels and metric tires. They weren't the
> > real small ones, the medium sized factory tires. P29 or something, I
> > can't remember. I calculated
> > mostly highway MPG as almost 21 mpg! For a six banger that's good

 

No Bob, I just recently got the 31's last winter. I had my '98 since
winter of 97 and did these comparison of stock jeep vehicles.
3.07 w/ grizzlys vs. the 3.73 w/ 30" wheel package and Dana 44.

The 3.07 had way better mpg.

With the 30" wheel deal, the speedo was off from factory. That's how
it was back in '98. If you put BFG's 31" on, it's pretty much dead on
without changing a thing. Don't know how it is now.



magicclaw@mac.com (Bob) wrote in message news:<47b769ae.0409150544.7a9aeecf@posting.google. com>...
> When you switched to the 31s with your 3.73s (as I understood it you
> were running smaller tires on the 3.73 axles before), did you adjust
> your gas mileage comparison for the tire size difference? Because your
> speedo and therefore trip odo will be off slightly...enough to hide
> probably 2 or 3 mpg (depending on what your original tire size(s)
> were).
>
>
> budda66f@aol.com (Jeff) wrote in message news:<85392d89.0409140610.13a214eb@posting.google. com>...
> > "Jerry Bransford" <jerrypb@***.net> wrote in message news:<L7s0d.81286$yh.30792@fed1read05>...
> > > Jeff, it sure reads like you're reversing how a 3.73 vs. a 3.07 would be
> > > described by anyone I know.
> > >
> > > Jerry
> > > --
> > > Jerry Bransford
> > > PP-ASEL N6TAY
> > > See the Geezer Jeep at
> > > http://members.***.net/jerrypb/
> > > "Jeff" <budda66f@aol.com> wrote in message
> > >
> > Maybe I am Jerry. But I know the 3.07 had a lot of top end
> > left in fifth gear and it would fly on the highway. The 3.73's made
> > my jeep feel peppy at low speeds. I think this is how it's supposed
> > to work. Am I way off?
> >
> > Maybe the tire sizes had a lot to do with it as well. But my same
> > travel when I got my Dana 44/3.73 TJ required a lot more trips to the
> > gas station. I love it but it's a pig.
> >
> > The 3.07 had those grizzly wheels and metric tires. They weren't the
> > real small ones, the medium sized factory tires. P29 or something, I
> > can't remember. I calculated
> > mostly highway MPG as almost 21 mpg! For a six banger that's good