NP203 to part time?
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NP203 to part time?
I have a 78 FORD F150 with a NP203 transfer case, who makes a kit to convert it to part time as I would like to get just a little more fuel milage out of it. The rest of the driveline is just a 351M-C6, 3.50 gears and 33 12.5 15s. I'm most likely going to also drop my tire size down to a 31 10.5 15. That will be plenty big enough for what I do with it.
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NP203 to part time?
uriah, milemarker makes a kit ffor this. it is easy to do,but follow the directions closely. there are a load of needle bearings that fall out if you try to rush things along!!.
also replace the chain while your in there.lol.
also replace the chain while your in there.lol.
Cargo Master
Joined: Aug 2000
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From: SW Michigan
NP203 to part time?
uriah- what are you going to do with this truck, anyway? The parttime will help mileage some, but why not keep the taller tires, they will help too. Or maybe some new tires that are tall and narrow? DF
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NP203 to part time?
Well, it'll be street driven 50 percent of the time and offroading the other half as it has been since I've owned it. I mostly do a lot of trailriding in these here mountains of Kentucky. For what I do, I can do it well with a smaller tire and a little less ground clearance. I'm not one of these guys who puts a monster lift and 44s on a truck to run back and forth to the store, I like to go OFF ROADING. About the only other thing I'm doing to it is putting a limited slip up front and that's it. When you get in the really nasty off camber stuff, you won't need it:-)
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From: Gravel Switch, KY
NP203 to part time?
Uriah, What part of Kentucky do you live in? I am from Marion County in the central part of the state. I am not familiar with your transfer case, but isn't all that is needed for part time 4WD is
locking hubs to disengage the wheels from the drivetrain so the front axles and diff don't turn
while your T-Case is in 2WD?
DannyP
89 F-150 4x4 former EFI I-6 now carbed 351W, Edelbrock heads,cam,intake,carb.
MSD 6A, T-18 but looking for a ZF. 3.55's.
locking hubs to disengage the wheels from the drivetrain so the front axles and diff don't turn
while your T-Case is in 2WD?
DannyP
89 F-150 4x4 former EFI I-6 now carbed 351W, Edelbrock heads,cam,intake,carb.
MSD 6A, T-18 but looking for a ZF. 3.55's.
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NP203 to part time?
I'm down in SE KY, about 20 miles from Corbin, you know home of KFC... in Knox County.
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From: Gravel Switch, KY
NP203 to part time?
Yep, I don't know what I am talking about I reckon. I looked in JC Whitney where I saw these hubs and it also says something about gears. Does this mean the NP 203 just has 4L or 4H and no 2WD mode? I learn something every day.
DannyP
89 F-150 4x4 former EFI I-6 now carbed 351W, Edelbrock heads,cam,intake,carb.
MSD 6A, T-18 but looking for a ZF. 3.55's.
DannyP
89 F-150 4x4 former EFI I-6 now carbed 351W, Edelbrock heads,cam,intake,carb.
MSD 6A, T-18 but looking for a ZF. 3.55's.
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From: Gravel Switch, KY
NP203 to part time?
Oh, yeah I forgot. Uriah, I live about 2 hours away from you.
DannyP
89 F-150 4x4 former EFI I-6 now carbed 351W, Edelbrock heads,cam,intake,carb.
MSD 6A, T-18 but looking for a ZF. 3.55's.
DannyP
89 F-150 4x4 former EFI I-6 now carbed 351W, Edelbrock heads,cam,intake,carb.
MSD 6A, T-18 but looking for a ZF. 3.55's.
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NP203 to part time?
Correct. The NP203 is also chain driven. The shift pattern on the 203 is as follows...
Low Lock- Low- Nuteral- High- High Lock. When you are in high or low lock there is a 50-50 split between the front and back axles like about everything else. low range is also a pretty standard 2:1 reduction. The only thing I really like about the setup is the fact that I can kick into four wheel drive without having to jump out of the truck. Other then that, you wear everything out front faster as it is always turning unlike a parttime setup. I have a set of locking hubs (to install) but its kinda pointless as long as the
driveshaft and front diff is still turning. I'm also building a true woods truck and it will be fulltime, but not this one.
Low Lock- Low- Nuteral- High- High Lock. When you are in high or low lock there is a 50-50 split between the front and back axles like about everything else. low range is also a pretty standard 2:1 reduction. The only thing I really like about the setup is the fact that I can kick into four wheel drive without having to jump out of the truck. Other then that, you wear everything out front faster as it is always turning unlike a parttime setup. I have a set of locking hubs (to install) but its kinda pointless as long as the
driveshaft and front diff is still turning. I'm also building a true woods truck and it will be fulltime, but not this one.
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From: Gravel Switch, KY
NP203 to part time?
I am confused. What is the difference between low and low lock? I would tend to believe low and high sans "lock" would be where the front was disconnected from the powertrain, but without hubs to unlock the whole assembly still turns. I had a buddy that had a 79 F-250 and his seemed to be the same setup as far as the T-Case shifting options, but he had lock-in/out hubs. Am I still missing something here?
DannyP
89 F-150 4x4 former EFI I-6 now carbed 351W, Edelbrock heads,cam,intake,carb.
MSD 6A, T-18 but looking for a ZF. 3.55's.
DannyP
89 F-150 4x4 former EFI I-6 now carbed 351W, Edelbrock heads,cam,intake,carb.
MSD 6A, T-18 but looking for a ZF. 3.55's.
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NP203 to part time?
in lowlock. or high lock, you get a50-50 split front to rear. with low or high, you get differntial action from the transfer case from front to rear.
so, if you have non-locking front and rear axles, and full time transfer case, you can sit in the mud spinning one tire and going nowhere.
the transfer case acts like an axle differential to take power to front and rear in unequal portions.
so, if you have non-locking front and rear axles, and full time transfer case, you can sit in the mud spinning one tire and going nowhere.
the transfer case acts like an axle differential to take power to front and rear in unequal portions.
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From: Gravel Switch, KY
NP203 to part time?
I see says the blind man.....Thanks for enlightening me. So this is sort of the grandaddy to these All Wheel Drive cars out nowadays, where the front wheels pull some but not as much as the back or vice versa. Interesting.
DannyP
89 F-150 4x4 former EFI I-6 now carbed 351W, Edelbrock heads,cam,intake,carb.
MSD 6A, T-18 but looking for a ZF. 3.55's.
DannyP
89 F-150 4x4 former EFI I-6 now carbed 351W, Edelbrock heads,cam,intake,carb.
MSD 6A, T-18 but looking for a ZF. 3.55's.
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NP203 to part time?
The 203 is a full time T-case with a diferential in it that can be locked when needed, to act like a 205. Normal driving, all wheels have power, but permit slippage between axles for dry pavement driving. That is the reason for the Loc postion in both High & Low ranges. Bob
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NP203 to part time?
Looks like I'm gonna do a NP205 swap afterall. I just got done converting it and it don't work. Not happy. The parttime kit is simple to install, but I'm assuming I have a chain problem (even though it looked good) or the linkage is screwed up.
I'm gonna take the back of the case apart again in a few days and double check everything again. Might just be something stupid, but it is together correctly. I have high and low range but no four wheel drive. Any ideas?
I'm gonna take the back of the case apart again in a few days and double check everything again. Might just be something stupid, but it is together correctly. I have high and low range but no four wheel drive. Any ideas?