V10 overdrive
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Freshman User
Joined: Sep 2009
Posts: 30
Likes: 0
V10 overdrive
ok newb here and have a question. i have a 99 v10 f350 crew cab 10" lift with 38.5 tires. ya its a monster. heres my question this thing hates over drive never stays in but only runs at about 2500rpm at 75 is this normal for the 10's?
Lead Driver
Joined: Sep 2003
Posts: 5,844
Likes: 5
From: Albuquerque
If I had to guess...You might be running 3.73's. So...going to the 4.88's will certainly keep your tranny happy.
I always recommend http://www.ringpinion.com/ .
Good luck...
biz
More Turbo
Joined: Jan 2009
Posts: 530
Likes: 2
From: LI, NY
Use this to help figure out what ratio you want: Gear Ratio Calculator
1) Find out what ratio you have (easiest to hardest)
a) read tag on rear
b) read tag on front axle or stamped # ( see Dana Bill of Materials ) and send me your BoM #
c) Divide ring gear tooth count by pinion tooth count
2) Run calculator for actual ratio & OEM tire size - record both direct drive & overdrive results.
3) Run calculator for possible ratios & current (or desired) tire size - record both direct drive & overdrive results.
4) Heavy tires may need higher RPM than OEM. If in doubt ask!
5) Make sure ratio you want is available for both axles!
1) Find out what ratio you have (easiest to hardest)
a) read tag on rear
b) read tag on front axle or stamped # ( see Dana Bill of Materials ) and send me your BoM #
c) Divide ring gear tooth count by pinion tooth count
2) Run calculator for actual ratio & OEM tire size - record both direct drive & overdrive results.
3) Run calculator for possible ratios & current (or desired) tire size - record both direct drive & overdrive results.
4) Heavy tires may need higher RPM than OEM. If in doubt ask!
5) Make sure ratio you want is available for both axles!
Trending Topics
More Turbo
Joined: Nov 2004
Posts: 713
Likes: 5
From: Minneapolis, MN
1) Find out what ratio you have (easiest to hardest)
a) read tag on rear
b) read tag on front axle or stamped # ( see Dana Bill of Materials ) and send me your BoM #
c) Divide ring gear tooth count by pinion tooth count
a) read tag on rear
b) read tag on front axle or stamped # ( see Dana Bill of Materials ) and send me your BoM #
c) Divide ring gear tooth count by pinion tooth count
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Hotshot
Joined: Mar 2007
Posts: 10,101
Likes: 40
From: Pa
FWIW at 75mph I am well over 3k rpm in 3rd (1:1) with 3.73s and 33's. I think if you regear the truck to 4.88s you will be much happier with the way the truck performs. The 99' NonPI motor isn't as much of a revver as the PI 2v and 3V is so you might be better off with 4.88s. 4.88s and 38.5" tires will give you an effective ratio of around 4.05 and 5.13s and 38.5" tires is around 4.26.
https://www.ford-trucks.com/calculat...re_sizes/a-er/
https://www.ford-trucks.com/calculat...re_sizes/a-er/
Hotshot
Joined: Mar 2007
Posts: 10,101
Likes: 40
From: Pa
Like I posted up above 4.88s with 38.5s will be about 4.05 gears and 5.13s will be about 4.26. (with stock 32" tires) Going with 5.13s will give you the most power to the ground but they will be really turning at 70mph and making some heat. I'd recommend getting a finned aluminum cover for the rear diff either the 08' ford diesel cover or a mag hytec to keep heat down. I would get ahold of Teamudd here on FTE he has a lots of experience with big tires and gearing on the V10 trucks and he could tell you better than I could as far as the pros and cons of the two gearsets.
https://www.ford-trucks.com/forums/member.php?u=278144
Heres his site http://team-mudd-racing.com/
https://www.ford-trucks.com/forums/member.php?u=278144
Heres his site http://team-mudd-racing.com/
Posting Guru
Joined: Jun 2005
Posts: 1,268
Likes: 8
From: central Louisiana
are you running 2500 rpms @ 75mph in D (3rd gear)? if so then YES you have 3.73's ( i would put money on it)! on OD (4th you'd be at about 1700rpm @ 75mph.......)
the V10 isn't afraid of rpms'....... your focal point is around 2000-2300 rpm's the closer you get your cruising rpm's to the sweet spot the better the drive... my excursion cruises at 2000 rpms at 60mph with stock tires and factory 4.30 gears.
with 4.88's you'll be at about 1800rpm's @ 60mph , 2300rpm's @ 75mph
with 5.13's you'll be at about 1900rpm's @ 60mph , 2400rpm's @ 75mph
with 5.38's you'll be at about 2000rpm's @ 60mph , 2500rpm's @ 75mph
now these are just estimates, but its a darn close area of where you'll be at. personally i'm a 60mph cruiser....... i cruse 60mph towing or empty so that is the mph i focus on and determine what rpm i'd be at.
(by the way thanks DKF)
the V10 isn't afraid of rpms'....... your focal point is around 2000-2300 rpm's the closer you get your cruising rpm's to the sweet spot the better the drive... my excursion cruises at 2000 rpms at 60mph with stock tires and factory 4.30 gears.
with 4.88's you'll be at about 1800rpm's @ 60mph , 2300rpm's @ 75mph
with 5.13's you'll be at about 1900rpm's @ 60mph , 2400rpm's @ 75mph
with 5.38's you'll be at about 2000rpm's @ 60mph , 2500rpm's @ 75mph
now these are just estimates, but its a darn close area of where you'll be at. personally i'm a 60mph cruiser....... i cruse 60mph towing or empty so that is the mph i focus on and determine what rpm i'd be at.
(by the way thanks DKF)