4.10 Cruising rpm

SN90FiveOh

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Ok just wanted to know what peoples numbers were at 60 mph, 70mph and 80mph.
I had 3.73s in my 98 v6 auto and it screamed 3k rpm at 80 mph which seemed really high.I think that tranny was going out so anyone with 4.10s let me know what your numbers are like. Auto, Stick, 5spd,6spd. Whatever.
 

McCloud

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When I had 4.10s in my car, with my 4R70W and 315/35/17s in the back I was running approximately ~28-2900 rpm at 70 mph. At 80 mph I think I was ~31-3200 rpm.
 
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SN90FiveOh

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When I had 4.10s in my car, with my 4R70W and 315/35/17s in the back I was running approximately ~28-2900 rpm at 70 mph. At 80 mph I think I was ~31-3200 rpm.

Have you ever driven far like that? Ever had problems riding at high rpms?
 

the5.ohh

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I had 4.10s awhile ago, 5 speed 95 GT. At 50mph in 4th I was way past 3k. I couldn't imagine 60+ When it was auto with 4.10s it was around 2600ish. 5 speed at 60+ would be almost 3k plus easily. Way too high imo
 

lutter94

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These numbers aren't making any sense throwing them into an excel spreadsheet with all the ratios and such. I've entered my numbers into online calculators and they are matching up, idk.....

3.73 Gears in a 1998 4R70W @ 80 MPH (assuming 245/45-R17 tires, stock tire height) = 2734 RPM in 4th

4.10 Gears in a 4R70W @ 70 MPH (315/35-R17 Tires, same tire height as 245/45-R17) = 2630 RPM in 4th

4.10 Gears in a 4R70W @ 80 MPH (315/35-R17 Tires, same tire height as 245/45-R17) = 3005 RPM in 4th

4.10 Gears in a 95 T5 @ 50 MPH (same tire height as above) = 2683 RPM in 4th (1825 RPM in 5th)

4.10 Gears in a 95 T5 @ 60 MPH (same tire height as above) = 2189 RPM in 5th
 
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SN90FiveOh

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Cool. I like that whole layout. I think I'll be alright with 4.10s and I'm going to do a 5 speed swap later mainly for the extra gear on the highway and because this auto sucks.
 

lutter94

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The specs I found, 94/95 4th Gear is 0.667 ratio. The 94/95/Fox T5 has a 5th Gear ratio of 0.68. About 2% higher, so your RPM's will increase that percentage. However, if you got a T5 with the 0.63 5th gear, your RPM's would drop 5.5%.

4.10 Gears - AODE - 245/45-R17 @ 60 MPH = 2148 RPM
4.10 Gears - T5 - 245/45-R17 @ 60 MPH = 2189 RPM

4.10 Gears - AODE - 245/45-R17 @ 70 MPH = 2506 RPM
4.10 Gears - T5 - 245/45-R17 @ 70 MPH = 2554 RPM

4.10 Gears - AODE - 245/45-R17 @ 80 MPH = 2864 RPM
4.10 Gears - T5 - 245/45-R17 @ 80 MPH = 2919 RPM
 

Ferocious

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I run about 2600-2700 at around 70mph with my T45 and 4.10s. Most of the time I'm on the freeway i'm doing more like 60 and it juts a bit over 2500K.
 

lutter94

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Which t5 has the higher overdrive ratio?

The T5Z that Ford Racing sells has 0.63, Ford put 0.68 in the foxes and 94/95 GT/Cobra. There might have been 0.63 in some other fox trannies, but I don't think they have the same power limits.

Keep in mind the T5Z has the fox length input shaft. You'd have to swap to the longer input shaft to use a 94/95 bellhousing.
 

kb1982

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Tremec 3550 close ratio with .82 5th gear, 4.10 and 275/50 R15 MT ET Street Radials. These are the numbers from wallace racing which is pretty accurate.
Engine Speed (RPM) MPH 4.10 Gear MPH Gear MPH Gear
8000 RPM 179.81 MPHMPHMPH
7500 RPM 168.57 MPHMPHMPH
7000 RPM 157.33 MPHMPHMPH
6500 RPM 146.10 MPHMPHMPH
6000 RPM 134.86 MPHMPHMPH
5500 RPM123.62 MPHMPHMPH
5000 RPM 112.38 MPHMPHMPH
4500 RPM 101.14 MPHMPHMPH
4000 RPM 89.90 MPHMPHMPH
3500 RPM 78.67 MPHMPHMPH
3000 RPM 67.43 MPHMPHMPH
2500 RPM 56.19 MPHMPHMPH
2000 RPM 44.95 MPHMPHMPH
1500 RPM 33.71 MPHMPHMPH
1000 RPM 22.48 MPHMPHMPH

 

lutter94

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Tremec 3550 close ratio with .82 5th gear, 4.10 and 275/50 R15 MT ET Street Radials. These are the numbers from wallace racing which is pretty accurate.

Where did you find this? I was on their site, seemed a little dated, but a few simple calculators were matching mine. My numbers aren't matching yours, not saying they're wrong, just want to fix mine if I have a mistake somewhere......
 

kb1982

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Where did you find this? I was on their site, seemed a little dated, but a few simple calculators were matching mine. My numbers aren't matching yours, not saying they're wrong, just want to fix mine if I have a mistake somewhere......

Did you use the .82 ratio for the transmission. This isnt with the T5, but for a close ratio Tremec 3550 TKO 500/600. The same trans without close ratio has a .68 5th, with the exception of the 600, which is .64. Here is the websit for the calculator. They have another one, but it assumes a 1 to 1 trans ratio that most 3 speed autos are. http://www.wallaceracing.com/gear-speed.php
 

lutter94

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What are you using for tire height, I have 25.826"? Still not getting to match your 179.81 mph. I'm guessing we're not jiving there, since .82 and 4.1 are pretty fail safe...lol.
 

talltim

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I wish I had 4.10s! My mustang was for track only for a few years so I ran 4.30s. The recession happened and now Im trying to use it as a DD; considering 3.73s.
 

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