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Powerstrokin'
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847 Posts
Discussion Starter #1
I am looking at buying a 92 7.3 4X4 idi and want to know what the gear ratio
is. the guy who owns it doesnt know either. i took a picture of the axle tag wit
my camera but cant get pics on laptop. but if i can see correctly i think the tag

says V121D on the top and L(or1)55 10 2 1125 on the bottom.

and at 70 mph its runnin 2100- 2300rpms with 33 inch tires. Any help would be
greatly appreciated.


Thanks, Corey
 

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OBS junkie
Joined
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8,250 Posts
L means "Limited slip", L55 means 3.55 gears.
 

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OBS junkie
Joined
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8,250 Posts
This is 4.10 gears with 33" tires, converter locked & in OD.

 

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<---new toy
Joined
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856 Posts
I am looking at buying a 92 7.3 4X4 idi and want to know what the gear ratio
is. the guy who owns it doesnt know either. i took a picture of the axle tag wit
my camera but cant get pics on laptop. but if i can see correctly i think the tag

says V121D on the top and L(or1)55 10 2 1125 on the bottom.

and at 70 mph its runnin 2100- 2300rpms with 33 inch tires. Any help would be
greatly appreciated.


Thanks, Corey

look up Ford parts.com this works on a lot of Fords. search by VIN number it should have it in there. what is the tach on @ 70 MPH? 21 is 3.73 I think 4.10's are about 24 or 25
 

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Powerstrokin'
Joined
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847 Posts
Discussion Starter #7
Well thanks guys.. i appreciate the knowledge output. im pretty sure it has 3:55s in it. my pickup has 4:10s and wanted that dana 60 to match but i may beable to just trade, not sure yet. what do you guys think 4:10s would run at 70mph ridin on 35's?.. 2200 maybe??
 

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OBS junkie
Joined
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8,250 Posts
what do you guys think 4:10s would run at 70mph ridin on 35's?.. 2200 maybe??
Right around there, 4.10s & 35s is just about perfect, it puts you around a 3.73 & 31" ratio.
 

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Powerstrokin'
Joined
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847 Posts
Discussion Starter #9
Right around there, 4.10s & 35s is just about perfect, it puts you around a 3.73 & 31" ratio.
Alright sounds awesome.. thanks!
 
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