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NP205 vs NP203

Discussion in '1969-1972 K5 | Suburban | Truck' started by clarkekent, Mar 6, 2002.

  1. clarkekent

    clarkekent Registered Member

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    Okay so my cousin lost the brakes on the '72 and headed into a guardrail on the Cross Bronx Expressway. He bent the chassis and cracked the transmission and transfercase. The chassis is being fixed right now.
    I can get an NP203 out of a '79 blazer at a reasonable cost - is the NP203 better or worse than the NP205? Is it longer/shorter? Same side drop? Advantages/disadvantages?
    Does anyone have an NP205 for sale at a reasonable price near NYC?
     
  2. Triaged

    Triaged 1/2 ton status

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    The 203 is not quite as strong as a 205 because the 203 is chain drive and the 205 is gear drive. The 203 is also a full-time 4WD case unless it has been converted to part-time. It is also a bit longer than a 205 but the front output is close to where the 205 is (because the 203 has a diff in it). If it is a Chevy the drop will be on the correct side.
     
  3. clarkekent

    clarkekent Registered Member

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    How's the 208? I may be able to get a t400 - NP208 setup.
     
  4. Triaged

    Triaged 1/2 ton status

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    the 208 has a lower lo range than the 205 or 203 (I think 2.8 : 1). It is an aluminum case and they usually do fine as long as they have a skid to protect them (if droping the t-case on rocks is something you would do). They arn't as strong as a 205 (almost nothing is!) but are lighter and have a good lo range.
     
  5. 4x4machine

    4x4machine Registered Member

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    sorry but this is slightly off topic, but what exactly do you mean by full time 4x4, the same full time 4wd like a subaru for instance? thanks, I am just a little foggy on what you mean.
     
  6. wrath

    wrath 1/2 ton status

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    203 t.case is a fulltime chain driven unit..without manual lockouts you have 4wheel drive all the time,with manual lockouts in the free position you wont have 4 wheel drive but your front driveshaft will still spin sending power to front axle..there's a part time conversion kit you can purchase to switch this from full time to part time..the 205 case is the highly desirable part time gear driven case and you'd be better off going this way.
     
  7. 4x4machine

    4x4machine Registered Member

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    What were they ever thinking making it full time 4wd? So with the manual lockouts in place, how much would the conversion kit cost to switch this from full to part time 4wd?

    oh yea, what years had this full time 4wd?

    Thanks
     
  8. NITRO

    NITRO 1/2 ton status

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    Hey trigad, your full of [censored]. I have a a 203 and so does my brother. They aren't full time.

    NITRO
     
  9. Triaged

    Triaged 1/2 ton status

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    But they were from the factory!
     
  10. 55Willy

    55Willy 3/4 ton status

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    Why is the word knowledge censored???? Dan is right 100%, a NP203 out of a chevy is a FULL TIME 4X4 t-case. ALL came from chevy with FULL TIME. as in no hubs, the case had a diff built in to transfer power between the axles until the driver selected the loc positions.
     
  11. wrath

    wrath 1/2 ton status

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    I think Milemarker makes a kit to convert to parttime but I'm not sure the cost ..I gave one away to a buddy of mine when I swapped to the 205.. If he's still got it I'll check today and post back into this thread..I believe GM switched to the 203 in 1973 and went to 1979 and then in 1980 they mounted 205 for that year then went back to the 203 and then started produceing the aluminum cased 208 in early '80's(<<not positive what year they started putting the 208's in)..
    Disclaimer: Don't take this as the Gospel cuz I'm just winging it from memory!! Wouldn't want to be labeled as full of (censored)..just tryin to help..
     
  12. Triaged

    Triaged 1/2 ton status

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    <blockquote><font class="small">In reply to:</font><hr>

    Why is the word knowledge censored????

    <hr></blockquote>
    LMAO!
     
  13. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    203 was used in auto equipped trucks from 73 to 79. 4 speed trucks got the 205 except for 74 when they backed the 4 speed with a 203. 1980 they discontinued the 203 and used the 205 in all models with all transmissions, 'cept they were all slip yoke 205's that year. 1981 was the intro of the NP208 and it was used behind the auto's and manual tranny's. Low range was 2.61:1 and they were all slip yoke. The NP241 replaced the 208 in 1990. (2.72:1 low range)

    Hope that helps somewhat.

    Rene
     
  14. GMCLegacy

    GMCLegacy 1/2 ton status

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    driveshaft lengths are all different, 205 will have the shortesnt front dirveshaft, the 203 is slightly longer, and the 208 is the longest frontdriveshat, the same goes for the rear in oposite order.......
     
  15. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    There are also two different 205 front shafts depending on the year. There is a flange front output 205 (later years) and a yoke front output 205 (early years).
    The flange front output is the stronger of the two...so if you have a choice go with the flange front output.

    rene
     
  16. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    Rene, 241's came out in 1989, and were the only manual speedo cable version, 1990 on they were electric speedos.
     

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