I am turning 33's with 3.31 gears....

5th at 65 is more like 1800 rpm for me. 2300 rpm gets me close to 70
mph.

As an experiment, I ran my Cherokee with P235's on it in 4th only on our
last trip into the bush. The last 24 hour gas station is exactly 200
highway km from my local fill and the Cherokee got exactly the same
mileage without having to shift into 5th and back down to 4th if I
wanted to pass or something.

It was easier to drive too. I only need a twitch on the gas pedal to
adjust for wind or a hill where in 5th, it takes the full throw to the
floor sometimes, then you have to think on down shifting, etc... More
work.

My odometers and speedometers are right on with each other and my GPS.
Well, my Cherokee is almost 0.1 km different on that 200 km run, we do
it often.

I have no issues in town. 3rd is good up to a 40 mph cruise for me and
keeps me in the 2300 range and the 'no speeding ticket' range where I
get decent city mileage. 2nd will haul out to 50+ mph at 4500 rpm if I
really want to scoot...
;-)

Same for off road, I seldom need or use 1st low, I drive mostly in 3rd
low, 2nd down hills.

Mike

Andy wrote:
>
> Hi Mike,
>
> Exactly my thoughts. Actually, my TJ with stock gearing is barely suitable
> for street use. My new thoughts are to change gearing soon after lifting
> and other mods.
>
> I believe my 5th gear is 0.79 (Overdrive ratio). So at 65 and a 3.73 gear
> set, and 33" tires, I will turn 1975 RPM.s. So fifth gear is out as Bill
> pointed out. In fourth I will turn 2469 RPM's and that fine.
>
> Now if I install 4.56 gears, in 5th I will turn 2414 RPM's. I like that and
> the fact that I will have all 5 gears available.
>
> I'm still looking into this but so far this looks the best. 4.10's will
> give me 2171 RPM in fifth. A little low.
>
> With 30" stock tires I turn a little under 2200 RPM's in 5th. Not much
> power there. At 2414 RPM I might like it and have 33" tires to boot. And
> that's at 65 MPH.
>
> This is fun!
>
> Andy
>
> "Mike Romain" <romainm@sympatico.ca> wrote in message
> news:3FA1286B.66837C36@sympatico.ca...
> > I get the best mileage running my 86 at 2300 rpm, 19 US mpg.
> >
> > If I use 5th, I drop well below 2000 rpm and then my gas mileage sucks.
> >
> > Mike
> > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > 88 Cherokee 235 BFG AT's
> >
> > Andy wrote:
> > >
> > > Thanks Bill & Gerald,
> > >
> > > I guess I'll stick with the ratio I have know and give up 5th like you
> say
> > > Bill. I don't particularly like it now at 2150 RPM's. Kind of weak in
> 5th.
> > > I see I will only have to go to 4.11 if I change the ratio. Fuel
> mileage
> > > should be OK and I can use 5th downhill. LOL
> > >
> > > Andy
> > > "L.W. (ßill) ------ III" <----------@***.net> wrote in message
> > > news:3FA05C62.ECF5226A@***.net...
> > > > Hi Andy,
> > > > You may see that you're just inside the chart at:
> > > > http://www.4wheelparts.com:80/Tirel_Gear_Ratio.asp Of course, you'll
> > > > have to forget about using the overdrive, fifth gear.
> > > > God Bless America, ßill O|||||||O
> > > > mailto:-------------------- http://www.----------.com/
> > > >
> > > > Andy wrote:
> > > > >
> > > > > I am building up my 01 TJ and have gotten super advice from the
> group.
> > > > > Right now I run a hair under 2200 RPM's (Approx), in fifth, with
> 3.73
> > > gears
> > > > > at 65 MPH. Rear diff is a Dana 44. I have 30" stock tires now.
> When
> > > I go
> > > > > to 33" tires will I need to go to 4.11 or maybe 4.56, or can I stay
> at
> > > 3.73.
> > > > > I don't think I should because my RPM's will be below 2000 at 65, I
> > > > > believe. Is my thinking correct on this? I will be mostly "on
> road",
> > > > > sometimes on long trips on the highway. But I want good off road
> > > manners
> > > > > also.
> > > > >
> > > > > Thanks
> > > > >
> > > > > Andy
> > > > > OTR Driver, home for a month.
> > > > > 2001 TJ Sport
> > > > > Dana 44 rear
> > > > > 3.73 Gears
> > > > > 5 Speed

 

Right!

I miss my 79 CJ7 with the four speed, T4 (I think) tranny. That would
crawl.

So I guess I will shoot for a 4.56 ring and pinion. That should give me a
good 5th and good gearing for off road in 4low.

Now all I need is cash! Thanks to all for assistance on this project. I
want to do it once, correctly.

Andy

"CRWLR" <beerman@yahoo.com> wrote in message
news:vq32dj9crdd1f@corp.supernews.com...
>
> "Andy" <trailrider2008@hotmail.com> wrote in message
> news:TCfob.48312$275.118426@attbi_s53...
> > Hi Mike,
> >
> > Exactly my thoughts. Actually, my TJ with stock gearing is barely
> suitable
> > for street use. My new thoughts are to change gearing soon after
lifting
> > and other mods.
> >
> > I believe my 5th gear is 0.79 (Overdrive ratio). So at 65 and a 3.73
> gear
> > set, and 33" tires, I will turn 1975 RPM.s. So fifth gear is out as
Bill
> > pointed out. In fourth I will turn 2469 RPM's and that fine.
> >
> > Now if I install 4.56 gears, in 5th I will turn 2414 RPM's. I like that
> and
> > the fact that I will have all 5 gears available.
> >
>
> Another thing you have not mentioned is that 1st gear with the stock
gearing
> is way too tall, meaning that slow speed travel is difficult to impossible
> without slipping the clutch. Going with 4.56s will let 1st gear work at
low
> speeds again.
>
>
>

 

Right!

I miss my 79 CJ7 with the four speed, T4 (I think) tranny. That would
crawl.

So I guess I will shoot for a 4.56 ring and pinion. That should give me a
good 5th and good gearing for off road in 4low.

Now all I need is cash! Thanks to all for assistance on this project. I
want to do it once, correctly.

Andy

"CRWLR" <beerman@yahoo.com> wrote in message
news:vq32dj9crdd1f@corp.supernews.com...
>
> "Andy" <trailrider2008@hotmail.com> wrote in message
> news:TCfob.48312$275.118426@attbi_s53...
> > Hi Mike,
> >
> > Exactly my thoughts. Actually, my TJ with stock gearing is barely
> suitable
> > for street use. My new thoughts are to change gearing soon after
lifting
> > and other mods.
> >
> > I believe my 5th gear is 0.79 (Overdrive ratio). So at 65 and a 3.73
> gear
> > set, and 33" tires, I will turn 1975 RPM.s. So fifth gear is out as
Bill
> > pointed out. In fourth I will turn 2469 RPM's and that fine.
> >
> > Now if I install 4.56 gears, in 5th I will turn 2414 RPM's. I like that
> and
> > the fact that I will have all 5 gears available.
> >
>
> Another thing you have not mentioned is that 1st gear with the stock
gearing
> is way too tall, meaning that slow speed travel is difficult to impossible
> without slipping the clutch. Going with 4.56s will let 1st gear work at
low
> speeds again.
>
>
>

 

Right!

I miss my 79 CJ7 with the four speed, T4 (I think) tranny. That would
crawl.

So I guess I will shoot for a 4.56 ring and pinion. That should give me a
good 5th and good gearing for off road in 4low.

Now all I need is cash! Thanks to all for assistance on this project. I
want to do it once, correctly.

Andy

"CRWLR" <beerman@yahoo.com> wrote in message
news:vq32dj9crdd1f@corp.supernews.com...
>
> "Andy" <trailrider2008@hotmail.com> wrote in message
> news:TCfob.48312$275.118426@attbi_s53...
> > Hi Mike,
> >
> > Exactly my thoughts. Actually, my TJ with stock gearing is barely
> suitable
> > for street use. My new thoughts are to change gearing soon after
lifting
> > and other mods.
> >
> > I believe my 5th gear is 0.79 (Overdrive ratio). So at 65 and a 3.73
> gear
> > set, and 33" tires, I will turn 1975 RPM.s. So fifth gear is out as
Bill
> > pointed out. In fourth I will turn 2469 RPM's and that fine.
> >
> > Now if I install 4.56 gears, in 5th I will turn 2414 RPM's. I like that
> and
> > the fact that I will have all 5 gears available.
> >
>
> Another thing you have not mentioned is that 1st gear with the stock
gearing
> is way too tall, meaning that slow speed travel is difficult to impossible
> without slipping the clutch. Going with 4.56s will let 1st gear work at
low
> speeds again.
>
>
>

 

"Andy" <trailrider2008@hotmail.com> wrote in message
news:sVgob.46841$mZ5.277402@attbi_s54...
> Right!
>
> I miss my 79 CJ7 with the four speed, T4 (I think) tranny. That would
> crawl.
>
> So I guess I will shoot for a 4.56 ring and pinion. That should give me a
> good 5th and good gearing for off road in 4low.
>
> Now all I need is cash!

DETAILS! they will get you every time.

 

"Andy" <trailrider2008@hotmail.com> wrote in message
news:sVgob.46841$mZ5.277402@attbi_s54...
> Right!
>
> I miss my 79 CJ7 with the four speed, T4 (I think) tranny. That would
> crawl.
>
> So I guess I will shoot for a 4.56 ring and pinion. That should give me a
> good 5th and good gearing for off road in 4low.
>
> Now all I need is cash!

DETAILS! they will get you every time.

 

"Andy" <trailrider2008@hotmail.com> wrote in message
news:sVgob.46841$mZ5.277402@attbi_s54...
> Right!
>
> I miss my 79 CJ7 with the four speed, T4 (I think) tranny. That would
> crawl.
>
> So I guess I will shoot for a 4.56 ring and pinion. That should give me a
> good 5th and good gearing for off road in 4low.
>
> Now all I need is cash!

DETAILS! they will get you every time.