front differential gear ratio question
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New User
Joined: Dec 2002
Posts: 8
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From: Lombard USA
front differential gear ratio question
Hello fellow enthusiasts.
I have installed a '79 F-350 4x4 axle on a '90 E-350 van and I need to verify the gear ratio.
I have not been able to find a tag on the axle housing and have a number from the ring gear. The problem is that I am not sure what this number is stating.
12 13 73 DANA 620108A A30D304-10
Can anyone tell if this gives me enough information to determine the ratio?
I have installed a '79 F-350 4x4 axle on a '90 E-350 van and I need to verify the gear ratio.
I have not been able to find a tag on the axle housing and have a number from the ring gear. The problem is that I am not sure what this number is stating.
12 13 73 DANA 620108A A30D304-10
Can anyone tell if this gives me enough information to determine the ratio?
Post Fiend
Joined: Nov 2001
Posts: 14,947
Likes: 6
From: Topsfield, MA
front differential gear ratio question
It looks like 3.73, but never use 4wd if the axle ratios arnt the same, they must be within 1% of eachother. An easy way to get an idea as to what it is, get the front tires in the air and put a mark on the driveshaft so you can see it from the tire. Turn the tire once, and if the shaft turns 3 and 1/2 times it's around 3.55. If it's between 3 and 1/2 and 4, it's probably 3.73. If it's more than 4 times, but less that 4 and 1/2, it's probably 4.10s...etc etc.
Primary rig is Green Thunder:
95' F-150 XLT 4x4, 302, 5 spd, MSD 6A, Flowmaster Exhaust, Sunroof, Clear corners w/ Diamond headlights, CD player with 2 10" subs and some 32" BFG Muds
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Check out my Gallery for a look-see.
Justin - One Happy FTE Member
Primary rig is Green Thunder:
95' F-150 XLT 4x4, 302, 5 spd, MSD 6A, Flowmaster Exhaust, Sunroof, Clear corners w/ Diamond headlights, CD player with 2 10" subs and some 32" BFG Muds
.Check out my Gallery for a look-see.
Justin - One Happy FTE Member
Posting Guru
Joined: Dec 1999
Posts: 1,903
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From: Copley, OH
front differential gear ratio question
>It looks like 3.73, but never use 4wd if the axle ratios
>arnt the same, they must be within 1% of eachother. An easy
>way to get an idea as to what it is, get the front tires in
>the air and put a mark on the driveshaft so you can see it
>from the tire. Turn the tire once, and if the shaft turns 3
>and 1/2 times it's around 3.55. If it's between 3 and 1/2
>and 4, it's probably 3.73. If it's more than 4 times, but
>less that 4 and 1/2, it's probably 4.10s...etc etc.
If it's an open diff, you need to jack up only one wheel on on the axle and turn it 2 revolutions and count the driveshaft revs. If it's a limited slip you jack up both wheels and turn them through 1 revolution.
>arnt the same, they must be within 1% of eachother. An easy
>way to get an idea as to what it is, get the front tires in
>the air and put a mark on the driveshaft so you can see it
>from the tire. Turn the tire once, and if the shaft turns 3
>and 1/2 times it's around 3.55. If it's between 3 and 1/2
>and 4, it's probably 3.73. If it's more than 4 times, but
>less that 4 and 1/2, it's probably 4.10s...etc etc.
If it's an open diff, you need to jack up only one wheel on on the axle and turn it 2 revolutions and count the driveshaft revs. If it's a limited slip you jack up both wheels and turn them through 1 revolution.
Freshman User
Joined: Nov 2002
Posts: 45
Likes: 0
From: Newtown PA
front differential gear ratio question
Have you driven the van in 4 wheel yet? If so, and your truck isn't dead yet, just look at what the rear is. Has to be the same.
Dan
'95 F150 Eddie B
Heavy Duty Springs
32 BFG AT KOs
3.73's w/ trac loc rear
smittybilt push bar w/ 2 KCs
clearance lights and custom fogs
System One racking
"A mean work truck"
Dan
'95 F150 Eddie B
Heavy Duty Springs
32 BFG AT KOs
3.73's w/ trac loc rear
smittybilt push bar w/ 2 KCs
clearance lights and custom fogs
System One racking
"A mean work truck"
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