3.73 gears or 4.10

70 is right at 2500.

i think 80 brings me up close to 3000 and the gas mileage starts dropping off quick at that speed. it would prolly be better with a full locking converter, instead of ford's steady state slip nonsense.
 
With the 4.10s I was at 2550rpms at 70 mph. With the 4.30s now, my rpms only went up by 200 rpms. (2750rpms) I hardly noticed the difference going from 4.10s-4.30s. Not sayin' 4.30s are the ultimate street gear or anything :shifty:
 
KStromberg said:
:steering < If I had a T56. :p
Click to expand...

amen.

3gears.gif
 
chris2523 said:
i think 80 brings me up close to 3000 and the gas mileage starts dropping off quick at that speed. it would prolly be better with a full locking converter, instead of ford's steady state slip nonsense.
Click to expand...

So you're running a stock TC with 4.10's? Just wondering how well that works. I thought I'd read somewhere before that the 4.10's with a stock converter didn't work well as a daily driver- something about "stoplight creep" or something. I'm wanting to run 4.10's (or 4.30's MAYBE) in my next Mark, so I was just curious how big of a driveability issue it is to drive it like that before I could eventually get around to the TC?
 
*Maverick* said:
So you're running a stock TC with 4.10's? Just wondering how well that works. I thought I'd read somewhere before that the 4.10's with a stock converter didn't work well as a daily driver- something about "stoplight creep" or something. I'm wanting to run 4.10's (or 4.30's MAYBE) in my next Mark, so I was just curious how big of a driveability issue it is to drive it like that before I could eventually get around to the TC?
Click to expand...

4.10 where 100% fine with stock converter when i ran it that way.
 
Cool! That's good to hear. It's been years since I read that on one of the forums I used to be a lurker on (I think it was the mainly Mark VII-site I used to be a member on or maybe it was one of the "other" Mark VIII sites). :shifty:
 
I've never heard that before and don't really understand what the reasoning for assuming that would be. I can say with a looser convertor there is less "creep".
 
gears

A re post~~~~
With 3.07s - 25" tire .70 od and 2000rpm you will be at 69.2 mph
With 3,73s that would get ya 56.99 at 2000 - a loss of little over 12 mph
2030 rpm = 70 mph with 3.07s
2160 rpm = 70 mph with 3.27s
2350 rpm = 70 mph with 3.55s
2470 rpm = 70 mph with 3.73s
2570 rpm = 70 mph with 3.90s
2700 rpm = 70 mph with 4.10s
2850 rpm = 70 mph with 4.30s
3000 rpm = 70 mph with 4.56s
3200 rpm = 70 mph with 4.88s
3400 rpm = 70 mph with 5.13s
3900 rpm = 70 mph with 5.88s
Looks like 373 will gain ya close to 500 rpm and 4.11 will gain ya close to 700.
Looks like either gear would be great - just lose 200 rpm with the 4.11s over the 3.73s so that ain't gonna kill ya and the 3.73s won't be too far off the mark<< couldn't resist the pun - especially if you already have them.
 
JAX.TRUX said:
A re post~~~~
With 3.07s - 25" tire .70 od and 2000rpm you will be at 69.2 mph
With 3,73s that would get ya 56.99 at 2000 - a loss of little over 12 mph
2030 rpm = 70 mph with 3.07s
2160 rpm = 70 mph with 3.27s
2350 rpm = 70 mph with 3.55s
2470 rpm = 70 mph with 3.73s
2570 rpm = 70 mph with 3.90s
2700 rpm = 70 mph with 4.10s
2850 rpm = 70 mph with 4.30s
3000 rpm = 70 mph with 4.56s
3200 rpm = 70 mph with 4.88s
3400 rpm = 70 mph with 5.13s
3900 rpm = 70 mph with 5.88s
Looks like 373 will gain ya close to 500 rpm and 4.11 will gain ya close to 700.
Looks like either gear would be great - just lose 200 rpm with the 4.11s over the 3.73s so that ain't gonna kill ya and the 3.73s won't be too far off the mark<< couldn't resist the pun - especially if you already have them.
Click to expand...

Nice quick reference chart! Thanks!
ThumbsUp.jpg
 
JAX.TRUX said:
A re post~~~~
With 3.07s - 25" tire .70 od and 2000rpm you will be at 69.2 mph
With 3,73s that would get ya 56.99 at 2000 - a loss of little over 12 mph
2030 rpm = 70 mph with 3.07s
2160 rpm = 70 mph with 3.27s
2350 rpm = 70 mph with 3.55s
2470 rpm = 70 mph with 3.73s
2570 rpm = 70 mph with 3.90s
2700 rpm = 70 mph with 4.10s
2850 rpm = 70 mph with 4.30s
3000 rpm = 70 mph with 4.56s
3200 rpm = 70 mph with 4.88s
3400 rpm = 70 mph with 5.13s
3900 rpm = 70 mph with 5.88s
Looks like 373 will gain ya close to 500 rpm and 4.11 will gain ya close to 700.
Looks like either gear would be great - just lose 200 rpm with the 4.11s over the 3.73s so that ain't gonna kill ya and the 3.73s won't be too far off the mark<< couldn't resist the pun - especially if you already have them.
Click to expand...

nobody's running a 25" tire. stock size is 26.6 275 40 18" 26.7"high makes a difference
http://www.markviii.org/LOD2/tirecalc/tirecalc.html
your at 2500rpm at 70 with 4.10
http://vexer.com/automotive-tools/speed-rpm-calculator
 
the1andonlygr81 said:
nobody's running a 25" tire. stock size is 26.6 275 40 18" 26.7"high makes a difference
http://www.markviii.org/LOD2/tirecalc/tirecalc.html
your at 2500rpm at 70 with 4.10
http://vexer.com/automotive-tools/speed-rpm-calculator
Click to expand...

Exactly. You have to factor in tire size. At stock height I run just a needle's width over 2700rpms at 70 mph with 4.30 gears. The 4.10s were right around 2500.

Thanks for pointing that out the1andonlygr81. I didn't even notice that on the chart. I just glanced at it as being there. So, in all reality the above chart is worthless to us MarkVIII guys running stock tire height because the data in the above chart is all skewed.
 
stock height tires

KStromberg said:
Exactly. You have to factor in tire size. At stock height I run just a needle's width over 2700rpms at 70 mph with 4.30 gears. The 4.10s were right around 2500.

Thanks for pointing that out the1andonlygr81. I didn't even notice that on the chart. I just glanced at it as being there. So, in all reality the above chart is worthless to us MarkVIII guys running stock tire height because the data in the above chart is all skewed.
Click to expand...

I doubt many people running gears are running stock tires -- it's just a reference anyway so thanks net for the thumbs!
 
25" is real short.

and many people run stock sized tires still. 245 50 17, or 275 40 18, or whatever.
 
JAX.TRUX said:
I doubt many people running gears are running stock tires -- it's just a reference anyway so thanks net for the thumbs!
Click to expand...

I run 4.10's with 18's and have kept the stock tire height, most people go with larger/taller tires, not shorter when adding gears/wheels, etc.

25" is short for the Mark which would throw the whole list off by a few hundred rpms, but as you said its reference anyway.

currently - 275/40/18 - 26.66" tall 10.82 wide

stock - 225/60VR16 - 26.62" tall 8.85 in wide

FWIW, i think I turn around 2500 rpms @ 70 also with 4.10s
 
JAX.TRUX said:
I doubt many people running gears are running stock tires -- it's just a reference anyway so thanks net for the thumbs!
Click to expand...

Stock tires no, but stock height, why not brosef? An even bigger question, why the hell would they run a shorter tire with a steeper gear? That makes no frickin' sense to me. Sounds like a half-assed way to knock up your gear ratio to me. If you want steeper gears, then buy them and have the car tuned for it. Don't put Cheerios on your car. And don't forget about the transmission shift schedule either. That can get all goofy too with shorter tires. Shifts can be too early. Learn anything yet?

So yeah, the 25" tire graph is skewed and worthless data. Don't question me because I know everything. :p
 
KStromberg said:
Exactly. You have to factor in tire size. At stock height I run just a needle's width over 2700rpms at 70 mph with 4.30 gears. The 4.10s were right around 2500.

Thanks for pointing that out the1andonlygr81. I didn't even notice that on the chart. I just glanced at it as being there. So, in all reality the above chart is worthless to us MarkVIII guys running stock tire height because the data in the above chart is all skewed.
Click to expand...

chris2523 said:
25" is real short.

and many people run stock sized tires still. 245 50 17, or 275 40 18, or whatever.
Click to expand...

im always here for my peeps. even at reference, 1.5" can make a few hundred rpm diff, or your lady very unhappy (if its 1.5"shorter) lol why go shorter? i'm going 285 40 or 295 thats 27":D:D
 
I'm running 245/45-17's and 275/40-17's, which @ 812 revs per mile, are actually a bit under 25". :p
 
DLF said:
I'm running 245/45-17's and 275/40-17's, which @ 812 revs per mile, are actually a bit under 25". :p
Click to expand...

That's just because you secretly want 4.30 gears like me but are too busy putting that damn Canton oil pan and windage tray on your car. :D

So what does that effectively put you at for a gear ratio? And don't say 4.10 liar! :p
 
KStromberg said:
That's just because you secretly want 4.30 gears like me but are too busy putting that damn Canton oil pan and windage tray on your car. :D

So what does that effectively put you at for a gear ratio? And don't say 4.10 liar! :p
Click to expand...

Near 4.30's, I guess. 2,719 RPM @ 70 MPH, 3,107 @ 80 MPH.

What rear tire do you use at the track?
 
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