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Old Nov 29, 2005 | 07:47 PM
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Transfer case upgrade
I have a 75 Ford F150 300 6cyl, 4 speed standard trans with a one speed transfer case. I have a 205 from a 77 automatic C6 trans that I would like to swap onto the standard trans. Does anyone know what parts I will need to make the swap.

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Old Nov 29, 2005 | 08:29 PM
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Originally Posted by baily034
I have a 75 Ford F150 300 6cyl, 4 speed standard trans with a one speed transfer case. I have a 205 from a 77 automatic C6 trans that I would like to swap onto the standard trans. Does anyone know what parts I will need to make the swap.

Thanks.
are you sure of that, I don't think I've ever seen a one speed transfer case?
 
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Old Nov 29, 2005 | 08:31 PM
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From 73-79 there were only 2 options of transfer cases and both had 2 speeds, one was a NP205 part time t case, and the other was a NP203 full time t case.
 
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Old Nov 29, 2005 | 08:41 PM
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It's probably being stubborn and will not go into 4low
 
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Old Nov 29, 2005 | 08:45 PM
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some 73-74 F100s had a single speeds transfercases
 
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Old Nov 29, 2005 | 09:25 PM
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Just went and rechecked the tc I want to put in the 75 Ford and it is a NP 203. Sorry about any confusion.
 
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Old Nov 29, 2005 | 09:30 PM
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Actually I'm having a similar problem, and I'm pretty sure it's only the linkage. Not sure how to fix it, but I know if I go under the truck and switch it into 4wd then the t case works great.
 
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Old Nov 29, 2005 | 10:06 PM
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The tc in the truck now is a single speed. Only 2w high and 4w high, no low at all, that is why I am wondering if the NP203 would go in and what parts would be needed.
 
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Old Nov 29, 2005 | 11:31 PM
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Ok, you'd need a adapter from a standard tranny that came off of a NP203 also. Then you might need a 203 crossmember, and driveshafts.
 
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Old Nov 30, 2005 | 12:05 AM
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I have the 203 driveshaft from the automatic. The frame has the crossmember in place. The 75 has the driver side mount for the 203. Is there a spline shaft that goes from the output shaft of the transmission to the input shaft of the tc. Thanks for all your help.
 
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Old Nov 30, 2005 | 07:09 AM
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Do you have the model # of the one speed?
 
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Old Nov 30, 2005 | 07:09 AM
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Yes there is. The adapter between the tranny and t case are all different, whether they are manual or auto, 203 or 205.
 
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Old Nov 30, 2005 | 09:16 AM
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Originally Posted by EricJ
Do you have the model # of the one speed?
Its a dana-21, used from 69-74 F100's, not just 73-74
 
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Old Nov 30, 2005 | 10:13 AM
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Originally Posted by oldhalftons
Its a dana-21, used from 69-74 F100's, not just 73-74
That must have been a penny pinching move by ford, I've never seen one in my life on anything, hell even the crapbox bronco 2 my wife had was a 2 speed.
 
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Old Nov 30, 2005 | 10:56 AM
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A lot of OEMs used a single speed T-case in those days. Not too many people really had the need for a low range.
 
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