i have a 435/d-21 combo out of a 73 f150

i also have an 83 f150 300/435 two wheel drive truck



i am swapping in a ttb 4x4 front end in to the 83

i was thinking about using the 435/d21 combo so i can have basically an allwheel drive rig if i need it.
this is a tow rig and driver set up not offroader.

has anyone had any experience with these cases

i dont need a low range just occasional 4 wheel drive


any thoughts ....good or bad

 

That's a full time 4wd transfer case? If it is, poor fuel mileage is what they are famous for.

 

i was thinking it was 2 hi and 4hi
the stocker had hubs on the front.


i dont know ?????thats why im asking..lol

 

Ok, I found out the "435" is a New Process 4 speed tranny. Here's some info
http://www.novak-adapt.com/knowledge/np435.htm

Here's some info on the dana 21. Sounds like they like it and it's strong. But as you mentioned, it doesn't have 4 wheel low range.
http://www.novak-adapt.com/knowledge/model_20.htm

I don't know what you are going to use your truck for, but I have found myself using 4 wheel low on several occasions. But since the 435NP has a granny low, you will probably be alright, except possibly backing up, where you would not have the gear reduction.

Don't get confused though, and think it's "all wheel drive". It's just like any other part time transfer case, and you should not do much maneuvering on dry pavement with it locked in 4wd. The full time transfer case I thought you where talking about is more like a all-wheel drive system, and you can make sharp turns with it in 4wd on dry pavement.

 

basically i need 4 wheeldrive only in very limited situations....ie towing into certain off road parks.

other wise i dont need it.

a few years ago i was in colorado towing my buggy(rockcrawler) and got caught in the snow and hit 4 low and it was to much reduction for the amount of traction i had. I ended up runnin in 4hi and it worked perfect.Thats why i was thinking about the d-21...ie(no 4low)
it would be in 2 hi the rest of the time.

 

You may be ok then. And like I said, that tranny has a granny gear, so you will have a creep gear in forward if you ever need it.

The truck I had was a 302/c6 and the one time I really needed the 4wd low was when I was plowing snow with the company f250. I was trying to push the snow up in a big pile, and got it packed underneath to where it high centered the truck. So I had to go around to the parking lot and get my truck, and hook to the co pickup to pull it out of the snow bank. My truck was on dry pavement, and I held the gas pedal to the floor, and it would not pull the co. pickup out of the snow. No spinning or anything, it would just sit there and moan. Pulled it down in 4wd low, and it came right out. I also use it for pulling trees over and out of the woods, and stuff like that. It bascially makes the truck into a tractor