Strange gear ratio combo
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From: Mastic Beach, NY
Strange gear ratio combo
I just had my numbers off my dataplate deciphered on here and I was told I have 4.55's in the front and 4.10's in the rear, why would someone have ordered the truck with that ratio? The truck is a 74 f250 with a d44hd up front and a d60, np 203 divorced mount and a c6 auto. Oh and another question, is it true that all factory np203's were full time t cases? Thanks, Jack
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Joined: Feb 2009
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From: Plankinton, SD
I have the same 203 case in my 76 and it has a conversion to make it a 2wd. If you want this just punch np203 on google and you can find parts to do this. As far as the gear ratio I have never heard of this and would be very afraid of driving in 4wd. I just can't believe you can order a truck with 2 different ratios. I think 2 classics is right on. Something is going to break. Also if you work on the case put a new chain in it. I just bought one for 93 bucks and made one case out of 2. Both chains were bad and they seem to be a good part to change if you take it apart.
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Sounds to me like somone has switched out the gears in one differential or the other. Possible switched the entire axle. I am not dumb enough to make the statement that Ford never put those gears in there trucks, however I have never heard of them doing it.
It is common to find 1 number difference between the front and rear. I have worked on lots of trucks that had a 4:10 rear and a 4:09 in the front. Or a 4:11 rear and a 4:10 front.
It is common to find 1 number difference between the front and rear. I have worked on lots of trucks that had a 4:10 rear and a 4:09 in the front. Or a 4:11 rear and a 4:10 front.
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From: Mastic Beach, NY
He is the one who decoded this for me, thats why I KNOW I am right. My question is not whether numberdummy was right, it is, why would someone order this ratio, is there any benifits??? I have a lot of fun making people's heads spin when I tell them my gear ratio!!! LOL
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From: Rock Springs, WY, USA
with your NP203, it is a full time four wheel drive transfer case. beings it is, it has a spider gear in it similar to the spider gear in your axles. this spider is so that the front and rear wheels can turn at different speeds because, to go around a turn, your front wheels have to travel farther than your rear, and this would bind a normal T-case. this is also why this case has 4lo, 4lo-lok, 4hi, and 4hi-lok. the lok means the spider gear in the case is locked so that you have true four wheel drive. i would not advise putting your truck in lok unless you are off-roading where the tires can slip to unbind the drivelines. MY GUESS to ratio difference: lower gears are easier for the motor to pull, in the unlocked positions of the case, when mudding or in snow, it is easier for the motor to turn the front axle than the rear, thus, effectively pulling with the front tires through the medium to prevent fish tailing or getting stuck. possibly for a plowing application, which seems likely with the automatic trans as well.
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Don't listen to these naysayers, as they are unaware of the TRUE facts.
What you have was factory installed by FoMoCo, and your Warranty Plate AXLE code proves it.
24P =
24 = Dana 60 / 4.10-1 / non Limited Slip / 5300 lb. Rear Axle Capacity.
P = Dana 44-6CF / 4.55-1 / non Limited Slip / 3500 lb. Front Axle Capacity // Power Steering.
Decoded from the 1973/79 Ford Light Truck Parts Catalog / General Information Section ~ Warranty Plate Decode Charts / Rear Axle Ratio Codes, Page 61 / Front Axle Ratio Codes, Page 62.
What you have was factory installed by FoMoCo, and your Warranty Plate AXLE code proves it.
24P =
24 = Dana 60 / 4.10-1 / non Limited Slip / 5300 lb. Rear Axle Capacity.
P = Dana 44-6CF / 4.55-1 / non Limited Slip / 3500 lb. Front Axle Capacity // Power Steering.
Decoded from the 1973/79 Ford Light Truck Parts Catalog / General Information Section ~ Warranty Plate Decode Charts / Rear Axle Ratio Codes, Page 61 / Front Axle Ratio Codes, Page 62.