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???early or late 77???

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Old Mar 3, 2008 | 09:44 PM
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levi18175
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From: Commiskey, In
???early or late 77???
I have a 77 F-250, long bed std cab. 4wd 4sp 400. I'm not sure of the axles at this point, as I am new to the high boy game, but a die hard Ford fan by heart. I was wondering if their was any way to identify my truck as a pre or aft 77.5. I am wondering soley for suspension upgrades. Also, how do I know which axles I have, and transfer case. I keep reading about the p203 and the 205. What is the difference, and how do I determine which one mine is.

Oh, it has a divorced transfer case.
 
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Old Mar 3, 2008 | 09:49 PM
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the shift pattern on the 205 is like this
4lo
n
2hi
4hi

the 203 pattern is like this
lo loc
lo
n
hi
hi loc

the 205 is gear driven and the 203 is chain driven
 
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Old Mar 3, 2008 | 09:50 PM
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oh yea the 203 is on trucks that were full time 4 wheel drive and the 205 is for the part time 4 wheel drive
 
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Old Mar 3, 2008 | 09:56 PM
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divorced transfer case i believe is pre 77.5
 
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Old Mar 4, 2008 | 01:19 AM
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Thanks for the info, I don't believe that I have a 203, I will have to take a look. I just got the truck, and I haven't had time to tear into it.

What about axles?
 
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Old Mar 4, 2008 | 01:28 AM
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1977: No "High Boys" were made after serial number Y20,001 (the last 6 digits of the VIN).
 
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Old Mar 4, 2008 | 08:10 PM
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The odds are pretty good you have a Dana 44hdf low pinion in front and a Dana 60 in the rear with a four speed (np435) you will have the np205 part time transfer case. 203's were full time and only behind automatics .
 
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Old Mar 4, 2008 | 08:19 PM
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203 was used behind 4 speed too. i know a guy that has a 77 high boy with a 4 speed and a 203 from factory he did the conversion to part time his self. he bought the truck new off the lot
 
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Old Mar 4, 2008 | 08:25 PM
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mine in a early 77, divorce t case, low pinion 44hd, 351m, 4 speed, 205, 2 1/4 wide rear springs
 
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