Gear ratio
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Laughing Gas
Joined: Oct 2019
Posts: 949
Likes: 109
From: Fowler Colorado
Gear ratio
I know there’s bunch of threads on this but I have a couple issues. My driver door was swapped with another truck so I can’t get the axle number. Truck is a 1996 f-350 with a ZF5
at 65 in 5th I’m at 2000 rpm
can anyone give me ideas on what rear end ratio I have? I have 285/75 tires all around so my speedo is slightly off but not much. I think 65 on the speedo is actually like 67 or something like that
at 65 in 5th I’m at 2000 rpm
can anyone give me ideas on what rear end ratio I have? I have 285/75 tires all around so my speedo is slightly off but not much. I think 65 on the speedo is actually like 67 or something like that
Lead Driver
Joined: May 2009
Posts: 6,804
Likes: 703
From: Tobyhanma, PA
Should be a combo. It usually indicates stock ratio and if it was limited slip.
Here's a site thats been linked before. Shows my diff as a 3.55 Limited slip. Not sure thats accurate lol.
Decodibg ford axle tags
Here's a site thats been linked before. Shows my diff as a 3.55 Limited slip. Not sure thats accurate lol.
Decodibg ford axle tags
Hotshot
Joined: Dec 2012
Posts: 11,267
Likes: 1,651
From: Las Cruces New Mexico
You probably have 4.10 judging that I have 3.55 and 305 55 20( 33") I run 2000 rpm at 75mph
One way to check is to mark one of your drums and back plate and pinion yoll to diff housing then turn the yolk by hand and see how many turns it took to do a complete turn om the drum if it turned 3.5 turns you have 3.55 if it took 4.turns 4.10. Pretty accurate in telling what gear you have and a good way to find gear rations on axels.
One way to check is to mark one of your drums and back plate and pinion yoll to diff housing then turn the yolk by hand and see how many turns it took to do a complete turn om the drum if it turned 3.5 turns you have 3.55 if it took 4.turns 4.10. Pretty accurate in telling what gear you have and a good way to find gear rations on axels.
Logistics Pro
Joined: Mar 2007
Posts: 4,577
Likes: 837
From: knoxville, tn
Probably 3.55 gears. Your description is pretty close to how mine behaves at similar speeds. I am also running 285s
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Hotshot
Joined: Dec 2012
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From: Las Cruces New Mexico
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