Axle / differential question.
Sit. Stay.
Joined: Oct 2001
Posts: 18,308
Likes: 20
From: Washington State
Listen just go 60mph in OD. If you're turning around 1700 you've got 3.73's. If it is turning 1950 or so then you've got 4.30's.
...or choose your own speed here using .71 as the transmission ratio & 31.6 as the stock tire size. (if your tires are stock)
http://www.angelfire.com/space/slr/RPMCalculator.htm
Save the jack for changing tires.
...or choose your own speed here using .71 as the transmission ratio & 31.6 as the stock tire size. (if your tires are stock)
http://www.angelfire.com/space/slr/RPMCalculator.htm
Save the jack for changing tires.
Junior User
Joined: Dec 2006
Posts: 93
Likes: 0
Sorry folks if that's incorrect information... I received from a gear manufacturer when inquiring about replacing my gears looks like we (Excursion Owners) need to be careful out there as aftermarkets are giving out incorrect information. I seem to always be told that the excursion is the same as the superduty... apparently not true. Glad I haven't ordered the gears yet. Thanks for all the clarification.
Junior User
Joined: Dec 2006
Posts: 93
Likes: 0
Assuming your truck is still stock you can also supply ford with your VIN number and they'll supply you with a build list. Found that mine had 4.10 gears and a limited slip. I requested mine trough the ford.com website.
Senior User
Joined: Nov 2006
Posts: 425
Likes: 1
From: Brooksdale, ON
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Cargo Master
Joined: Mar 2005
Posts: 2,790
Likes: 24
From: Mount Royal, NJ
The following is copied and modified from another site:
s 415b
301030b29
S = Sterling differential
415 = Model number
B = Revision identifier
I am assuming that the 4, as in 430 was rubbed off or covered. That would make for the following :
430 = 4.30 Gear ratio. If it was limited slip, the number would contain the letter L, as in 4L30
103 = Ring gear size. 10.5 inches. (Does it really say 103 or could it be 105?)
ob29 = Build date
--0 = Last digit in year of manufacture. In this case, 2000
--b = Month of manufacture. A=January, B=February, C=March, etc.
--29 = Day of manufacture
s 415b
301030b29
S = Sterling differential
415 = Model number
B = Revision identifier
I am assuming that the 4, as in 430 was rubbed off or covered. That would make for the following :
430 = 4.30 Gear ratio. If it was limited slip, the number would contain the letter L, as in 4L30
103 = Ring gear size. 10.5 inches. (Does it really say 103 or could it be 105?)
ob29 = Build date
--0 = Last digit in year of manufacture. In this case, 2000
--b = Month of manufacture. A=January, B=February, C=March, etc.
--29 = Day of manufacture
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