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I remember reading in Four Wheeler a few years ago about a nice toy that get mounted off of the front output of the transfer case and connects to a shortened front drive shaft. It's purpose is to allow slippage between the front and rear wheels with a gear drive t'case.
From what I remember, it forced 30 million viscosity silicon rubber into irregular shaped chambers to allow as much power to be transfered as possible to a 50/50 split, but let things move independently at different speeds when needed.
If your truck has a full time 4x4 system your transfer case is not an NP205. From 1974 to 1079 Ford's full time 4x's used the chain drive NP203, which you can convert (with manual hubs etc.) to part-time. IMHO part-time is really the best option because then you wear parts slower and get better gas mileage just driving around on the streets.
1)I have an extra already to replace the one that's dying in the truck now.
2)Better reputation for strength, and the truck will be in 2 wheel drive 98% of the time, the other 2% will be during drag racing to keep me from having to put a few hundred pounds in the bed to keep the rear tires planted. So the part time case is the better fit, i just need to keep the drive line from binding up.
I was a little unclear about what you're looking for. I'll describe what I've been wondering about, and maybe it's the same thing. I've got a 98 Ranger 4x4. My stepdad has a 98 Explorer fulltime 4x4. So instead of a T-case, he has a differential. I'd like to have a differential for fulltime 4wd like he has for pavement and being able to turn, something with limited slip, but still like to be able to have 2wd and 4low. Is this what you're talking about? Also, what do you know about the differential's that the explorers are using?
Thanks,
Brian J Wilson
1998 Ford Ranger XLT 4x4 4.0L 5spd SuperCab. Off-Road Package, LS, 31's