Hi all, I've got a 78 Bronco with a fresh 400 and rebuilt C6. The thing currently has the NP203 transfer case, & I was thinking about slapping in a NP205 that I have laying around. Are these my only two options?
I believe that all the tcases behind the automatics were 31 spline. I have used np208 and bw1356 in my Bronco with a c6. The np203 has a lower range than the 205 but the 205 is all gears no chain. The rest of them are all chain driven.
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DON'T BUY IT ..FAB IT!!!!
88 Bronco XLT 6.9 IDI, C6, Dana60 rear, 50 front, 3.55 gears, 33x12.5x16.5's. built by me becuase I just had to! Kentucky Chapter Member
since you have both cases i would go with a doubler build 203/205
Isn't a double system mainly used for rock crawling and so forth? I am planing on ussing this rig mainly for a camping rig and fun around old logging roads.
If that's the kind of off-roading you're going to be doing, maybe just throw the 208 in there and get yourself the extra low range. They used them for a long time in the 80+ Broncos and they're not exactly known as a weak point. Some see some pretty serious abuse with mudding and rock crawling.
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4bbl Holley 390 w/ Offenhauser DP intake. 4 speed Manual w/OD. K&N air filter, EFI manifolds, 2.5" exhaust.
3.00 rear end and 2000 RPMs @ 80mph!
i would run a doubler for sure even for those uses. the thing is you have a C6 auto so gearing is huge. you could run a 4.10's with 35" tires so your hwy rpms are decent and then when your out playing you will always have extra low gear options.
Basically, the NP203/205 doubler uses the range gear of the NP203 transfer case as an intermediate between the 205 and the transmission (think of it as a gear splitter if you will). There is a custom adapter needed to mount the NP205 and clock it in the right position so that the 205 does the 4x4 selection.
the above thread highlights this and has many pictures that show the 203 range gear on the front of a 205 transfer case. See the final pictures of what the finished doubler looks like.
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Stock 1978 F250 Custom regular cab 4x4 with 351M and 4 spd.
1991 Bronco silver anniversary, 5.8L EFI, E4OD swapped for C-6, custom trimmed rear fenders finished in rust.
2009 Fusion SE 2.3L 5spd Red/black cloth n leather
All right, now that I know all about the doubler, I must have one! I live in Oregon, does anyone have a clue as to were I could get the custom parts at? I have the NP203 and NP205 already.
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