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What transfer case do I have?

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Old Dec 29, 2014 | 08:50 PM
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What transfer case do I have?

I have a 75 f100 4x4. The lever reads 2wd all the way forward then 4wd pulled back. That is how I always have locked in the 4wd. There is no hi or lo? It has the np435.
 
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Old Dec 29, 2014 | 08:53 PM
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I think I've read that a Dana 20 (found in some jeeps and early broncos I believe) don't have a high/low range
 
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Old Dec 29, 2014 | 09:30 PM
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Have you figured out what the gear ratios are in your axles yet?
 
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Old Dec 29, 2014 | 09:55 PM
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Sounds like a dana 20. You might have to pull back a little harder to hit N and the 4 Low.
 
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Old Dec 29, 2014 | 10:04 PM
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Not yet I ain't got out there and messed with her since being out for the holidays. Hopefully this weekend for sure. So you think I do have a 4lo? What's the the gear seletion? 2wd 4 hi N then 4lo?
 
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Old Dec 29, 2014 | 10:45 PM
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Full time 4wd transfer case that is probably a New Process 203.

NP 203 **** on left , NP 205 **** on right

Look at the front edge of the transfer case for a silver blue tag.

I do not think its a Dana 20...?
 
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Old Dec 29, 2014 | 10:46 PM
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I had a 75 like that about 25 years ago, if I remember right it had a dana 21 transfer case, they have a real thin case to them that liked to crack. I replaced it with a 205 after mine broke in half. I believe that there was just 2wd and 4wd in that one
 
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Old Dec 29, 2014 | 11:15 PM
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Are dana 21 worth a flip?
 
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Old Dec 29, 2014 | 11:27 PM
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Not in my experience, the 360 and 435 that were in mine were enough to split it in half and drop half of the case on the road.
 
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Old Dec 29, 2014 | 11:32 PM
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Is the shift pattern 2wd all the way forward then 4wd is pulled back?
 
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Old Dec 29, 2014 | 11:35 PM
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Old Dec 29, 2014 | 11:43 PM
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If you are going change it out I would recommend a NP205 they handle about any kind of abuse that you can throw at them. I had a NP203 they are okay but if you put too much power (for instance a 429 SCJ) to them they will explode too! LOL
 
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Old Dec 30, 2014 | 12:09 AM
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Thanks for the links, I have had people say that I was nuts when I tell them I had one of those!
 
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Old Dec 30, 2014 | 05:29 AM
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back in my day we called them an in-&-out box, they were either in 2wd or 4wd and that was it,no high no low and yes, seen 3 that i remember laying in pieces on the ground. Junk it and go with a NP205 and try to brake it.
 
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Old Dec 30, 2014 | 08:10 AM
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Ok I confirmed this mornin it's is a model 21. So I guess I need to get my hands on a 205. What all is needed for a swap. Was the 21 uncommon in these trucks?
 
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