Why an NP203???? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

84 400 · 12-04-2008, 11:26 PM

Well looks like I am dragging home a new project/beater. It is a 77 stepper with a th350 and np203. What is with this transfer case. 4lowloc4lown4hi4highlock. Why did GM use this instead of a 205 or 208? I don't see the advantage to this transfer case except in plowing snow. What is the differences between low lock and low and 4 high and 4 high loc? I am just unfamiliar with this transfer case. I know it is chain linked which is a weak linc but is there any other problems with these?

Also being full time 4x4 I am going to try and maximize my fuel econ. I know it is a fruitless effort but Was wondering what can be done. Does pulling the front D shaft realy give you any better MPG? I have seen conversion kits but I think for the cost of them I would be better off swapping to an np205 with new drive shafts and front manual lock outs. Can I run manual lock outs with the 203 and gain any MPG?

thanks for the info guys. Like I said I have never messed with one of these before and am learning as I go

84 400 · 12-04-2008, 11:41 PM

Feel free to remove this post as I found most of my needed info here

http://www.4wheeloffroad.com/howto/47538/index.html

12-04-2008, 11:26 PM	#1
84 400 Sb 400 club Join Date: Nov 2005 Location: NH / MA Posts: 2,746	Why an NP203???? Well looks like I am dragging home a new project/beater. It is a 77 stepper with a th350 and np203. What is with this transfer case. 4lowloc4lown4hi4highlock. Why did GM use this instead of a 205 or 208? I don't see the advantage to this transfer case except in plowing snow. What is the differences between low lock and low and 4 high and 4 high loc? I am just unfamiliar with this transfer case. I know it is chain linked which is a weak linc but is there any other problems with these? Also being full time 4x4 I am going to try and maximize my fuel econ. I know it is a fruitless effort but Was wondering what can be done. Does pulling the front D shaft realy give you any better MPG? I have seen conversion kits but I think for the cost of them I would be better off swapping to an np205 with new drive shafts and front manual lock outs. Can I run manual lock outs with the 203 and gain any MPG? thanks for the info guys. Like I said I have never messed with one of these before and am learning as I go __________________ 1984 chevy c10, built 400sb,.(SOLD) 77 K10 Project / daily driver "The Grinch" http://67-72chevytrucks.com/vboard/s...d.php?t=318363 1956 Willys Wagon (327 chevy) Project (Now Buick 225) 1980 Corvette L-48 4 speed 1992 Mustang GT built 5.0 5 speed 1985 C10 LWB Sold 1982 K10 SWB plow truck Parted out 1986 D30 M1028 fire brush truck Parted out

12-04-2008, 11:41 PM	#2
84 400 Sb 400 club Join Date: Nov 2005 Location: NH / MA Posts: 2,746	Re: Why an NP203???? Feel free to remove this post as I found most of my needed info here http://www.4wheeloffroad.com/howto/47538/index.html __________________ 1984 chevy c10, built 400sb,.(SOLD) 77 K10 Project / daily driver "The Grinch" http://67-72chevytrucks.com/vboard/s...d.php?t=318363 1956 Willys Wagon (327 chevy) Project (Now Buick 225) 1980 Corvette L-48 4 speed 1992 Mustang GT built 5.0 5 speed 1985 C10 LWB Sold 1982 K10 SWB plow truck Parted out 1986 D30 M1028 fire brush truck Parted out



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