Picking up a Blazer( its a 79 by the way) this weekend with a NP203 with fulltime 4x4. Is this a good strong case, and can it be made not to have full time 4x4?


Thanks for the input! :confused:

It's not a bad t-case , in good shape it'll handle any small block.
Yes it can be converted to part time , seem's like the shaft replacement kit is the way to go.
By the way it's REALLY heavy!!!
Have fun

Yep, it is not a light unit, it's only a 140 pounds..
I have one in my 77 short bed and it works great.. I am running a pretty beefed up 400 small block and it has never made so much as a hick-up when I have been out..
I had it converted to part time for about 150 bucks at a local tranny shop and it helped with the milage big time....
I went from 7 to 12 just putting hubs and the part time kit it...
if you want to go to a 205 you need to change the drive shafts to match the new unit, so you might want to use it as long as it is working..
:)

Stongest half ton case was the 205.
Second strongest case was 203. It you take care of them you won't have a problem. They can handle a big block that is within reason. You could run 500hp through them
The shaft part time kit is the best but most expensive. stay with the Mile Marker kits. They are the only ones I have seen worth a crap, The Super lift kit is a POS.
When converted you MUST put the case in lock (leave the hubs unlocked on the street) about every 200 miles. Or wheel every weekend :)
The 203 was designed to oil by oil slinging off the chain. It has a resivior in the tailshaft housing that catches the oil and then pumps it into the tails shaft brearing. Then some of the oild goes up a gally in the shaft and lubes the upper chain gear bearings. If it runs dry you can fry the tail shaft bearings.
I plan to remove my lockright in the front and go back to full time for the winter months. It's super nice in snow and ice to have that extra traction.

Originally posted by Grim Reaper
Stongest half ton case was the 205.



Well not really my truck is a 1/2 tone well it's really a heavy half and it has the factory 202 witch is way stronger then the 205. but the 202 only has 2 to 1 low :(
and I really shouldn’t post this cuz it an IH

what makes a 202 stronger?
they look the same to me from 200-205

Originally posted by Chief Yelling Alot



Well not really my truck is a 1/2 tone well it's really a heavy half and it has the factory 202 witch is way stronger then the 205. but the 202 only has 2 to 1 low :(
and I really shouldn?t post this cuz it an IH
I guess I should have worded it "The strongest 1/2 ton case a Chevy was equipped with".
I'm not real up on the 202 but I thought it was the case that the 205 was evolved from. Gear drive 1.96:1 just like the 205.
205 ended up in a lot of stuff including fords, Dodge and Chevy. Not real up on my IH stuff. Tell us more Chief! I'm alwasy open to learning more including stuff on other brands.

Well I guess when 1970 came along they used the 205 cuz the 202 was over kill. In the early days from about 57 to 63 (I think) they used the 200 and 201 with were way to heavy for the pickup application (they should of been in a dump truck) for the 1/2 ton front axel it was a D-44 3/4 was a HD D-44 and 1 tone to 3 tone pickups/flat decks it was a D-70. Rear axel was everything from a 44 to a 60 to there own make of a FF. in 1968 the V-304 was made standard with 345 and 392 options. Their tranys varied from a 3 on the tree to a 5 speed on the floor most trannys were the T-98 4 speed with the granny low. If you had a 4X4 and wanted a winch they threw on a factory PTO winch that was good fore about 1200 LBS

Want to know more? :)

you might want to say what makes you believe that the 202 is tougher

Originally posted by mj
what makes a 202 stronger?
they look the same to me from 200-205
from what I have heard the gears are wider and I dont know if the 205 has it the same way but the 202's gears stay in the same spot and to shift it just moves a bunch of dog collers..... oh and the 202's gears are *all* hectical (teeth on a slant)

And from what I have also heard (from a reliable source) is the diameter of the shafts inside have a larger diameter then the 205 so I guess all in all it just a bigger unit


I'l see if I can find out more

Originally posted by Chief Yelling Alot

from what I have heard the gears are wider and I dont know if the 205 has it the same way but the 202's gears stay in the same spot and to shift it just moves a bunch of dog collers..... oh and the 202's gears are *all* hectical (teeth on a slant)

And from what I have also heard (from a reliable source) is the diameter of the shafts inside have a larger diameter then the 205 so I guess all in all it just a bigger unit


I'l see if I can find out more
Hmmm that's some pretty good stuff to know. I think the 202 may have been in some 60's chevy trucks also. There is one case that I know very little about on the Chevy but it does look like a 205. Then Chevy also ran a D20 (think that's right) in the late 60's till the 465 came. If it got the 465 or the TH350 or 400 it got the 205. Through 72 If it got the Saginaw 3 speed with colum shift it got the 20.
Thanks for the education Chief!