I have a chance to get a 300 to replace a 300 in my project Budget (84) Bronco Build.
I want to build a "rock rig" that is somewhat capable. It has a 4spd now, would the 300 and proper gearing be enough for moderate rock/trail crawling.

The truck will be stripped down to minimum needs. A SAS is in the plans too.
What is available as far as tranny/TC gearing?

 

A 300 should be fine with the proper gears. 300s produce about 280 pounds of torque at low rpms. Probably the best gearbox for you would be the NP435 4-speed, which you can find in 70s and early to mid 80's trucks. With a 6.69 granny low gear, they are true beasts. In the 80s a lot of them came with NP203 cases with 1.98 low range, so the better option there would probably be a divorced NP208 out of a 78 with 2.62 low range.

 

NP 203 in the 80's? divorced 208? Stock 300 making 280 FT/lb? What are you smoking man?
I'm far too tired to adress this properly right now, but no factory 300 ever made more than 265 ft/lb, the 203 died with the 70's, and the 208 was never divorced.

 

Please fill us in on all the details of tcs and trannys.
My Bronco has a 300 with 4spd and 2spd tc.
I do not want to spend too much for a mild crawling machine, I just want to build up to do the job.
I plan to get some numbers off the tc and tranny to figure out what I got as far as ratios go.

 

x10......ahh yep

 

Not trying to be a smart A**, but can you then tell me what this hunk of iron is in my garage? I got a divorced transfer case out of a mid 80's F-250. I was told that it was a NP208 and the tag on it says 208. The case is iron, not aluminum, and it is chain driven, which really led me to believe it was a NP208. Now I'm curious as to what it really is.....

 

Really?....hmmmm….

Ive never heard of one….id like to see some pics….

 

I'll see if I can pull it out and get some pics of it. I've had it for a few years as I was going to use it in a 2wd to 4wd conversion project that I scrapped. All I know is the front output is on the drivers side and it's an iron cased, chain driven, HEAVY(as in weight!) transfer case. What else could it be, as all of the Borg Warner cases I know of are aluminum cased and the 205 is gear driven, so I logically assumed it was a rare find divorced 208. beats me.......

 

maybe its a 203....and it just looks like a 8?

put it in low and check the gear ratio.....

 

I just got some info from NumberDummy and my 84 Bronco has a NP208 with 261 ratio.
I just have to give him some info to find out what tranny I have - he said there can be up to 3 different 4 spds.
My 8.8 is a sad 3.08 open diffy.
No matter it is all going to be replaced.

 

It sounds like you have a 203. Did you pull it from the F250, or were you TOLD it came from the F250? Even if it was IN the F250, somebody could have swapped it there. I've known people who would swap in 203s because they have "high lock" and "low lock". These people can't be taught that "lock" is what real transfercases do when you shift them into four wheel drive...

I don't know of any divorced 203's however, so I'm a little stumped there. You have cracked it open and are certain it is chain-driven, yes? If not my money's on it being a 205, they made LOTS of divorced 205's in the 70's.

 

I cracked it open when I got it, that how I knew it was a chain. Also, I pulled it from the 250. I said earlier that it was a mid 80's F-250, but now that I think of it, I believe it was an like and 81-83. The truck had a 351M motor that my brother needed to replace a bad motor in his early 80's F-350. After he pulled the motor, I yanked the transfer case for the project I was working on and never finished it, so, there it sits in my garage under a bunch of other parts...

 

I do not recall any divorced t-cases after 77.5 trucks. This was the beginning of the married cases and high pinion front differentials. There were plenty of divorced 203 cases. All the full time 4wd highboys had them.
203's are easy to identify. Cast iron case, two sift levers located on the left side of the range box. These are mounted on an inner and outer shaft that appear to be a common shaft. This means that it looks like one shaft that sticks out of the case. The inner and outer shaft rotate seperately. These rotate and do not go in or out of the case like a 205. The other identifier, is the large aluminum rear output. This houses the differential inside of the case that makes a full time unit full time. Even if a part time conversion has been done, it wil still have this giant aluminim aluminum tailshaft housing.

 

post pics so we can figure it out....

 

Here is a truck with a 300 and granny tranny and dana 60s. I imagine S&H over the pond might co$t.

I think the 300 with a granny and 4.56 gears and even just a 1.96 transfer case will do fine. I think for rock crawling I might consider a C-6 though. I was always surprised by the low end torque in my I-6/C-6 vehicles compared to the 302.

http://atlanta.craigslist.org/bar/408653047.html

81 f250 fresh rebuilt motor inline 6 granny gear trans dana 60 front and rear just about everything on this truck is new complete new front end has light body damage (very light) was used as a hunting truck and to play in the mud ive never found anything i could hook to that it wouldnt move has 8 lug front and rear i hate camo paint but someone done a very good job on this one open to all trades will post pics tommorow ceadershack@yahoo.com