On Feb 28, 6:38 pm, hammertc2...@yahoo.com wrote:
> On Feb 27, 11:08 pm, "Earle Horton" <a...@gracioso.usa> wrote:
>
>
>
> > The 3.73 was for improved gas mileage with the automatic. However, if you
> > put 4.11, 4.56 or even more reduction in it, you will probably get better
> > gas mileage and certainly betterperformance. This is because the "2.5L
> > Power Tech I-4 Engine" actually likes RPMs. Take note of your engine speed
> > on the tach at cruising speed, say 60 or 65 depending on personal style and
> > road conditions. You can afford to have that change to 3,000 rpm and keep
> > or even improve your current fuel economy. If you go over 3,000 you will
> > begin to lose.
>
> > For the math, say you are thinking of going to 4.56 axles and you are
> > currently turning 2,200 rpm at 60, which you find a comfortable speed. This
> > is just a guess. Your new engine speed at 60 after the axle change is going
> > to be 2,200 x (4.56/3.73) or 2,670 rpm, not too shabby. You won't be
> > passing that many people, but it should feel like aperformanceincrease.
> > If your lock-up torque converter is actually working, then you should be
> > able to rely on this calculation too, with no torque converter slippage at
> > highway speeds. An axle ratio change is pretty drastic in terms of expense,
> > but this calculation can show you what to expect. If you elect to change
> > the tire size, you multiply by the old tire size, and divide by the new tire
> > size, to get your new engine speed at a corresponding road speed. Don't
> > forget to have your speedometer adjusted if you try any of these tricks.
>
> > Earle
>
> > <hammertc2...@yahoo.com> wrote in message
>
> >news:1172631630.588048.251420@j27g2000cwj.googleg roups.com...
>
> > > On Feb 27, 6:58 pm, hammertc2...@yahoo.com wrote:
> > > > On Feb 27, 6:33 pm, The Merg <greg.merg...@REMOVEgmail.com> wrote:
>
> > > > > > You got 4.10 with an auto and 3.73 with a stick with a 4 banger in
> > '97.
>
> > > > > ??? This is backwards from pretty much every other year then.
>
> > > > > Scott in Baltimore wrote:
> > > > > >> The 3.73 gears are to make up for the torque converter slippage, I
> > think.
> > > > > >> The electric fan in mine "never" comes on while the vehicle is
> > > > > >> moving. Even
> > > > > >> in city driving or off road, 5 mph is enough to cool the engine.
> > That is
> > > > > >> why you get an electric fan. Of course, it is all wasted if you
> > don't
> > > > > >> set
> > > > > >> the thermostatic fan control properly. You can't blame the
> > > > > >> manufacturer for
> > > > > >> that. They do include proper instructions.
>
> > > > > >> Earle
>
> > > > > > You got 4.10 with an auto and 3.73 with a stick with a 4 banger in
> > '97.
>
> > > > I requested a build sheet from DC which may answer the "as build"
> > > > question.
> > > > I wonder if back in '97 era someone ordered a vehicle they had an
> > > > option to pick certain gearing via a 'package group' or something(?)
>
> > > > I just can't see someone spending $400 to $1000 to regear from 4.10 to
> > > > 3.73. Maybe they had to change both axles for some reason.
>
> > > Just checked and I received the build sheet. Looks like I have the
> > > stock gearing of 3.73.
> > > Here's a portion cut-n-paste from the build sheet:
> > > <snip>
> > > DGA - All 3-Speed Automatic Transmissions
> > > DGDS - 3-Spd. Automatic 30RH Transmission
> > > DHAP - Lock-Up Torque Converter
> > > DHNS - Command-Trac Part Time 4WD System
> > > DJJS - Dana 30/186MM Front Axle
> > > DMEP - 3.73 Axle Ratio
> > > DRJS - Dana M35/194MM Rear Axle
> > > EAAC - All Engines
> > > EPE - 2.5L Power Tech I-4 Engine
> > > <end snip>
>
> > > Also, evidently it had floor mats too. Who knew.:)
> > > TJ
>
> Thank you Earle and others. I think I know what I need to do. At
> today's gas prices any mod I do that actually increase mileage will
> payback in no time. Also, if I can get even close to stockperformanceby regearing it would be worth it. Even now my TJ is very
> drivable around town. I foresee my offroading to be mainly limited to
> the beach although no guarantees!
> I will start with the 4.0 throttle body mod first (relatively cheap)
> and see what happens. Then I'll add the cat-back..see what happens.
> Then I will regear....see what happens.
> I'll post results after each mod for reference.
> I kinda like Bill ------ post regarding the V8 or vortex....I'm
> considering that for when/if I blow-up the 4-banger or drive train.
> Y'all been a great help.
> Again, Thank you!
> TJ

Is there any way to figure how much torque I have at the wheels and
what it will be after a differential gear change? I'm only curious.
TJ

 

hammertc2000 wrote:

> Is there any way to figure how much torque I have at the wheels and
> what it will be after a differential gear change? I'm only curious.

google "rolling road"

The rest is all math.
http://www.blueink.com/CLASS/physcom1/gear.htm

--
DougW

 

hammertc2000 wrote:

> Is there any way to figure how much torque I have at the wheels and
> what it will be after a differential gear change? I'm only curious.

google "rolling road"

The rest is all math.
http://www.blueink.com/CLASS/physcom1/gear.htm

--
DougW

 

hammertc2000 wrote:

> Is there any way to figure how much torque I have at the wheels and
> what it will be after a differential gear change? I'm only curious.

google "rolling road"

The rest is all math.
http://www.blueink.com/CLASS/physcom1/gear.htm

--
DougW

 

Horsepower and Torque are measured at the engine. Gearing make that
power available over certain courses such as quarter mile, hill climb, or
high speed salt flats. A dream wheel for off-road:
http://www.rocky-road.com/calculator.html and:
http://www.oly4x4.com/gearratios.htm
God Bless America, Bill 0|||||||0
mailto:-------------------- http://www.----------.com/

<hammertc2000@yahoo.com> wrote in message
>
> Is there any way to figure how much torque I have at the wheels and
> what it will be after a differential gear change? I'm only curious.
> TJ
>



--
Posted via a free Usenet account from http://www.teranews.com

 

Horsepower and Torque are measured at the engine. Gearing make that
power available over certain courses such as quarter mile, hill climb, or
high speed salt flats. A dream wheel for off-road:
http://www.rocky-road.com/calculator.html and:
http://www.oly4x4.com/gearratios.htm
God Bless America, Bill 0|||||||0
mailto:-------------------- http://www.----------.com/

<hammertc2000@yahoo.com> wrote in message
>
> Is there any way to figure how much torque I have at the wheels and
> what it will be after a differential gear change? I'm only curious.
> TJ
>



--
Posted via a free Usenet account from http://www.teranews.com

 

Horsepower and Torque are measured at the engine. Gearing make that
power available over certain courses such as quarter mile, hill climb, or
high speed salt flats. A dream wheel for off-road:
http://www.rocky-road.com/calculator.html and:
http://www.oly4x4.com/gearratios.htm
God Bless America, Bill 0|||||||0
mailto:-------------------- http://www.----------.com/

<hammertc2000@yahoo.com> wrote in message
>
> Is there any way to figure how much torque I have at the wheels and
> what it will be after a differential gear change? I'm only curious.
> TJ
>



--
Posted via a free Usenet account from http://www.teranews.com

 

reviving an old thread...sorry for being tardy

Did someone say that you can attach the throttle body from a 4.0 to a
2.5 for more power? Is that true? Is it a bolt-on swap?

B

>> On Feb 24, 2:31 pm, "Earle Horton" <graci...@usa.com> wrote:
>>>> <hammertc2...@yahoo.com> wrote in message
>>>>news:1172344565.073873.112240@8g2000cwh.google groups.com...
>>>> Cat-back exhaust and 4.0 liter throttle body won't set you back
much,
>>>> especially since exhaust doesn't last forever. I found on mine
that the
>>>> mileage improved more than the power from engine mods. What you
>>>> really need to do is regear the axles.

 

reviving an old thread...sorry for being tardy

Did someone say that you can attach the throttle body from a 4.0 to a
2.5 for more power? Is that true? Is it a bolt-on swap?

B

>> On Feb 24, 2:31 pm, "Earle Horton" <graci...@usa.com> wrote:
>>>> <hammertc2...@yahoo.com> wrote in message
>>>>news:1172344565.073873.112240@8g2000cwh.google groups.com...
>>>> Cat-back exhaust and 4.0 liter throttle body won't set you back
much,
>>>> especially since exhaust doesn't last forever. I found on mine
that the
>>>> mileage improved more than the power from engine mods. What you
>>>> really need to do is regear the axles.

 

reviving an old thread...sorry for being tardy

Did someone say that you can attach the throttle body from a 4.0 to a
2.5 for more power? Is that true? Is it a bolt-on swap?

B

>> On Feb 24, 2:31 pm, "Earle Horton" <graci...@usa.com> wrote:
>>>> <hammertc2...@yahoo.com> wrote in message
>>>>news:1172344565.073873.112240@8g2000cwh.google groups.com...
>>>> Cat-back exhaust and 4.0 liter throttle body won't set you back
much,
>>>> especially since exhaust doesn't last forever. I found on mine
that the
>>>> mileage improved more than the power from engine mods. What you
>>>> really need to do is regear the axles.