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What happened ?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by SWAMPRNR, Dec 28, 2002.

  1. SWAMPRNR

    SWAMPRNR 1/2 ton status

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    Put manual hubs on 77 pick with a 203t/case. Now if the locks are not locked in the truck will not move.
    Never messed with a 203 is this normal ?
     
  2. Sandman

    Sandman 3/4 ton status Author

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    the case needs to converted to a part time case. the 203 is a full time case and has a differential built into it. Kind of like jacking up one tire on an open differential.
     
  3. BorregoK5

    BorregoK5 1/2 ton status

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    The 203 should still push the truck when in the 4 HILOC and 4 LOWLOCK positons but in 4HI and 4LOW the T-case will only spin the front shaft if it has not been converted to part time.
     
  4. Sandman

    Sandman 3/4 ton status Author

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    I'm guessing he didnt try this. /forums/images/graemlins/grin.gif
     
  5. BorregoK5

    BorregoK5 1/2 ton status

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    It happens to the best of us sometimes... usually after a long day of installing gear on a buddies unfamiliar truck. You can only hope you figure it out before you start taking it all apart again looking for a non existant problem. I hate it when that happens!
     
  6. Sandman

    Sandman 3/4 ton status Author

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    I ussually end up taking it all apart anyway because I dipped it up somewhere. /forums/images/graemlins/grin.gif
     
  7. SWAMPRNR

    SWAMPRNR 1/2 ton status

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    That solves that problem. Never used 203 before. Thanks
     
  8. Sandman

    Sandman 3/4 ton status Author

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    You bet. Good luck with it. /forums/images/graemlins/thumb.gif
     
  9. HarryH3

    HarryH3 1 ton status Author

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    Go to the main CK5 page, then scroll down to the tech article on Mile Marker conversion kits. It explains what happens in a 203 and how to convert it to part time. /forums/images/graemlins/cool.gif
     
  10. 3car

    3car 1/2 ton status

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    running a 203 in hi loc w/manual hubs w/o a kit will kill it.must convert to part time.better yet,if you can,swap it for a 205.its kind of a boat anchor.
     
  11. bigjbear

    bigjbear 1 ton status Staff Member Moderator

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    How,why? Never heard of it being a 'prob. Done it for up to two months at a time w/o anything going wrong.
     
  12. 3car

    3car 1/2 ton status

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    i dont remember exactly why,i read about it in 4wheeler,or 4wheel and off road.cant remember.they will wear inside and develop a clunk when you get on or off the gas,and eventually come apart.a actually bought a truck w/a 203 that had the front driveshaft removed.it had the clunk in it,but i didnt have it long enough to deal with it.trust me though,there is a conversion kit for a reason.if it wasnt needed,it would just be a set of hubs.
     
  13. bigjbear

    bigjbear 1 ton status Staff Member Moderator

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    The big plus to the kit is it saves gas and saves the front shaft ware. I don't see how spinning an unloaded shaft will cause damage. If you install the kit and don't use 4WD monthly it can cause damage due to oiling problems. The kit instructions even tell you this. Mags want to keep advertisers happy.
     
  14. 3car

    3car 1/2 ton status

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    i dont know,ive heard several times that you must convert to prevent damage.id do some research to make sure if i were you,but the 203 is a heavy high geared p.o.s anyway.
     
  15. 84_Chevy_K10

    84_Chevy_K10 Banned

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    Another newbie talking $hit.....

    Now I understand why pirate eats their young.
     
  16. 3car

    3car 1/2 ton status

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    newbie.ok,whatever.you have been around so much longer ,you are the king.and as for talking $hit,i tried to help,and ill bet this weeks check im on target about the conversion.my opinion on the 203 is my opinion(and that of most of the free world).they are good for the doubler,but we dont need 4:1 in florida to run trails or mud.
     
  17. BorregoK5

    BorregoK5 1/2 ton status

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    Your most definately entitled to your opinion but I disagree with you that an np203 is a piece of junk. The np203 is not a bad unit to have at all and can take just about as much abuse with its chain drive as the more popular np205 all gear unit. It has a lower ratio than the np205 while offering all wheel drive capabilities or part time capabilities with a kit. Your comment on the doubler usage is just another flexibility it provides. On top of that you get a cast iron case with fixed yolks. Given the choice I'd probably go with an np205 but the np203 comes in a close second above most every other offered in the 73-91 chevy trucks. Running your np203 in the hi loc position accomplishes the same thing the part time kit does and doesn't cause any long term wear when the front hubs are unlocked. What you don't get running this way is the capability to switch from 4wd (low or high) to 2wd (low or high) from the shifter as opposed locking and unlocking the hubs. Some part time kits for the np203 are nothing more than clips that keep the internal front to rear differential gears from opperating out of the LOC positions as opposed to eliminating them all together.

    Model --- Mode --- Drive --- Low Ratio
    NP203 --- Full-Time --- Chain Drive --- 2.00:1
    NP205 --- Part-Time --- Gear Drive --- 1.96:1
    NP207 --- Part-Time --- Chain Drive --- 2.61:1
    NP208 --- Part-Time --- Chain Drive --- 2.61:1
    NP219 --- Part-time/Full-Time --- Chain Drive --- 2.61:1
    NP228 --- Part-Time --- Chain Drive --- 2.62:1
    NP229 --- Part-Time/Full-Time --- Chain Drive --- 2.62:1
    NP231 --- Part-Time --- Chain Drive --- 2.72:1
    NP241 --- Part-Time --- Chain Drive --- 2.72:1
    NP242 --- Part-Time/Full-Time --- Chain Drive --- 2.72:1
    BW1305 --- Full-Time --- Chain Drive --- 2.57:1
    BW1345 --- Part-Time --- Chain Drive --- 2.74:1
    BW1350 --- Part-Time --- Chain Drive --- 2.48:1
    BW1354 --- Part-Time --- Chain Drive --- 2.48:1
    BW1356 --- Part-Time --- Chain Drive --- 2.69:1
    BW1370 --- Part-Time --- Chain Drive --- 2.69:1
    BW4404 --- All-Wheel Drive --- Chain Drive --- ?
    BW4405 --- ? --- Chain Drive --- ?
    Dana 18 --- Part-Time --- Gear Drive --- 2.46:1
    Dana 20 --- Part-Time --- Gear Drive --- 2.46:1
    Dana 24 --- Part-Time --- Gear Drive --- 1.86:1
    Dana 300 --- Part-Time --- Gear Drive --- 2.62:1
    Spicer 20 --- Part-Time --- Gear Drive --- 2.03:1
     
  18. bigjbear

    bigjbear 1 ton status Staff Member Moderator

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    OK, so no info to back up the claim? I "hear" stuff all the time but I am not going to believe it blindly.
     
  19. fourwheelerjeff

    fourwheelerjeff 1/2 ton status Staff Member Moderator

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    nice rebuttal mike /forums/images/graemlins/thumb.gif

    as many 203's are out there in old farm trucks that the help drives and abuses, i would think they are some pretty stout cases, i too, have heard of many people taking the full time hubs off and just replacing them with part time without the kit, and since they are so plentiful you can pick one up (not literally, they are heavy) for just about free /forums/images/graemlins/cool.gif

    maybe not the best, but not a p.o.s. in my book
     
  20. Sandman

    Sandman 3/4 ton status Author

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    I would rather have the 203 than the 208. I kept breaking those 208's. My 205 has held up fine though. /forums/images/graemlins/smile.gif
     

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