93 F250 gear ratio

[EMD_DRIVER]

The door frame sticker on my 93 says Axle: C5. I learned that it's a 4.10 limited slip axle. Not knowing a whole lot about axles, I'd like to know if/how the front axle would work, when in 4WD.

Also... With the E4OD, what kind of RPM's should I be seeing around 70? Even after swapping solenoid packs, I still show 2,400RPM's at 70.

Thanks!
Gary

 

[Diesel JD]

Check this rpm calculator http://ring-pinion.com 2400 is pretty high but at 70 without O/D when I had the C6 in there and the 4.10s I would be over 3000rpm, yeah I think I crossed the 3K mark at 68mph actually, so it could be, I don't know how deep the E4's overdrive is, but that calculator should tell you

 

[EMD_DRIVER]

The link you gave didn't work, so I took the dash out of it.. Went to www.ringpinion.com and found it..

It looks like I'm running an extra 300-350RPM's at 70.

 

[Cat_Rebel]

I run somewhere around 2200rpm at 70mph with 4.10s & 31s with E4OD.

 

[reklund]

That difference in RPM can be affected by tire size too... What size of rubber is on your truck?

Ryan

 

[EMD_DRIVER]

235/85-16's Are what I have on it now...

Gary

 

[coletrain777]

235/85/16's are 31.73 inches tall.
An E4OD final gear ratio is .71

This means that at 70mph in overdrive you should be running 2158 rpms. Now of course the tire circumference will go down slightly because of the sidewall compressing under the weight of the truck, but this should get you close. I would think anything over 2250 either means that your tires are severly underinflated, your torque converter isn't locking up in overdrive, or your gears are something other than 4.10's. If you have 4.56's they would make your engine turn 2400 rpm's at 70 mph (sounds like maybe what you have). Anyway, there ya go!

The site I use for calculating tire height is:
www.wallaceracing.com/tire-aspect-calc.php

and the rpm calculator I use is:
www.csgnetwork.com/multirpmcalc.html

Hope that helps... Cole

 

[160k87F250]

That would work if there was a direct connection between the trans and engine (I.E. manual trans), but there is a torque converter, and there is slippage with a torque converter. I bet there is a difference of rpm when you are going up a hill at 70 mph compared to coasting down a hill at 70 mph. With a manual transmission vehicle, the rpm stays constant with the vehicle speed. (Does that make sense?)
John

 

[Darrin Tosh]

Also... With the E4OD, what kind of RPM's should I be seeing around 70? Even after swapping solenoid packs, I still show 2,400RPM's at 70.

Thanks!
Gary

That is actually about right, especally with the 235's

 

[Dsl_Dog_Treat]

That is actually about right, especally with the 235's

+1 to that.

Spinning the same thing myself with the same size tire with a 5 speed.

 

[zpd307]

i have the e40d, 235/85 tires, and 3.55 gears. at 70 i am turning about 2050 rpms. at 2,000 i am at around 67/68 mph.

 

[LCAM-01XA]

235/85-16s here as well, 4.10 gears, 60 mph at 2000 rpms, 65 at 2150, and 70 at about 2300 if I remember correctly, but I usually keep it at 1900 rpm and 57 mph and get 20 mpg.

 

[Cat_Rebel]

235/85-16s here as well, 4.10 gears, 60 mph at 2000 rpms, 65 at 2150, and 70 at about 2300 if I remember correctly, but I usually keep it at 1900 rpm and 57 mph and get 20 mpg.

How you keep from getting run over on MI highways?

 

[LCAM-01XA]

lol, I stick to the right lane, only thing that can hurt me is a big rig and those actually move at just that speed during the day so we form a nice line. The small vehicles don't bother me, if they want to play chicken they're more than welcome to feel my half a foot thick and a foot and a half tall rear bumper and 2" solid-piece steel draw bar