hello, quick gear qeustion
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Senior User
Joined: Jan 2010
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From: fl
hello, quick gear qeustion
this is my first post, been trolling around the web, cant seem to find the info i need, I just bought a 79' f250 lwb single cab, 351m, c6, dana 60 rear, 44 front, can anyone tell me the available gear ratios for this truck? any help would be great thanks
Zombie Survivalist
Joined: Feb 2009
Posts: 14,809
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From: Rock Springs, WY, USA
well, 4.10s were an option, and as far as i know, and this is basically an educated guess, you probably dont have anything lower than about 3.55s in your truck, based on that it is a 4x4. what is your tire size (preferably in inches) and your engine RPM at 60 mph?
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Senior User
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From: fl
hmm dont know no tach, their 235/75/16's, i think thats like a 30x9.5x16, ill have to see, i was really jw what they offered, im hopein to do a 4" spring lift an 35s in the near future, if i have to re-gear it, ill just bite the bullet
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From: fl
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Zombie Survivalist
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Fleet Mechanic
Joined: Feb 2007
Posts: 1,326
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From: Middle TN
If there is no traction device in the differential (probably the front axle will not have one), Jack up one wheel and leave the wheel on the other side on the ground.
Put the transfer case or transmission in neutral and engage hubs.
Have a friend turn the drive shaft exactly one turn. It's best to put a chalk mark on it for reference.
You can then count the number of turns and partial turns that the jacked-up wheel turns.
Then divide this number in half. (Very important)
This will give you the approximate ratio.
This will not work with traction-loc, locking devices or both wheels off the ground.
It's been many years since I have use this but try it and see if this gives you the number you are looking for.
Put the transfer case or transmission in neutral and engage hubs.
Have a friend turn the drive shaft exactly one turn. It's best to put a chalk mark on it for reference.
You can then count the number of turns and partial turns that the jacked-up wheel turns.
Then divide this number in half. (Very important)
This will give you the approximate ratio.
This will not work with traction-loc, locking devices or both wheels off the ground.
It's been many years since I have use this but try it and see if this gives you the number you are looking for.
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 784
From: Simi Valley, CA
Usually, all that's listed is the rear axle ratio, weight capacity and whether it has Limited Slip or not.
1959 thru today: If the AXLE code begins with a letter = Limited Slip / With a number = no Limited Slip.
FTE has AXLE decoders, but these are not always accurate.
