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85 Dually 4x4 opinions??? any1?

Discussion in 'Truck & Equipment Repair' started by mountaindew5011, Oct 21, 2010.

  1. mountaindew5011

    mountaindew5011 Member
    Messages: 31

    ok so i bought an 85 dually 4x4good solid body except for front fenders. anyways it is always in 4x4 unless i unlike the hubs it has a 203 np transfer case. any1 ever heard of a 85 with AWD it has a 400 small block with a th400 behind it. any1 know any good or bad things about this truck for plowing it also has a meyer classic setup on it 8 ft. blade. 8ft. bed. thanks in advance Gary.:mechanic:
     
  2. 2COR517

    2COR517 PlowSite Fanatic
    Messages: 7,115

    203 in an 85 K30?
     
  3. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    If your engine and T-case specs are accurate neither the 400 small block nor NP 203 were still in production by the '85 model year. Good chance a prior owner swapped the entire drive line out of a pre-'80 3/4 or 1 ton truck.
     
  4. mountaindew5011

    mountaindew5011 Member
    Messages: 31

    np 203 case in 85

    if im correct the np 203 is always is 4wheel and the hubs are used to unlock it? correct me if im wrong? the hubs are spicer they just have 2 BIg solid gears that lock it in very tough looking and info on the spicer hub? likes or disllikes. seen that it has 14 bolt rear in axle and a 10 bolt up front?????
     
  5. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    Sure it's a 10 bolt? Never used a 10 bolt under a DRW truck. Dana's 60's have 10 bolts holding the cover on too you know but that doesn't constitute it as a 10 bolt...

    Yes the 203's are full time. Throw a part time kit in it and run it if it's in good shape.

    The Spicer hubs are about as robust as it gets.
     
  6. mountaindew5011

    mountaindew5011 Member
    Messages: 31

    it has a 10 bolt cover up front but i just changed the u-joints in the front axle and they had monster u-joints in them. SPicer hub was easy to take apart to. Just put a 6inch spring lift on the front today gottta wait till next month for the rear lol. the 4x4 shifter on the floor has no pattern on it. so i dont know if its in 4lo or what when im plowing
    thanks in advance b&b
     
  7. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    Definitely a 60 then...so you have the best there ever was. :drinkup:

    Snap an overall pic of the shifter and post it so we're positive it's a 203 and we'll get you informed on that one also..
     
  8. the_experience

    the_experience Member
    Messages: 75

    How many positions does the shifter have? Is the shift lever shaft round or square? That truck should have had either an NP208 or an NP205. Snap a picture of the back of the t-case.
     
  9. mountaindew5011

    mountaindew5011 Member
    Messages: 31

    np203 case

    payupits an all cast iron case it is to late now to take a pic here. i am gona try to find out what the shift pattern is before i plow with it. hearing a lot of bad things form fellow subs around here about the old skool chevys frame cracking habit!!!! behind the steering box and by the rear shocks>? ring a bell?
     
  10. mountaindew5011

    mountaindew5011 Member
    Messages: 31

    and the god awful lifter tick hopefully not a expensive replacement gona hope thats all it is?
     
  11. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    Throw a steering box brace kit on to avoid tearing the box loose. I like the ORD kits. Good preventative measure and requires a whole 20 minutes to install so they're fast and effective. http://www.offroaddesign.com/catalog/steeringkit.htm

    Never saw too many 1 tons broken at the narrow portion of the rear rails back then as most had a backup plate there so it was rare. But far more common they would tear a shock mount loose once in a while if really run hard and heavy.
     
  12. 2COR517

    2COR517 PlowSite Fanatic
    Messages: 7,115

    Tell us more about the tick......
     
  13. Stik208

    Stik208 PlowSite.com Addict
    Messages: 1,316

    2COR517 PhD in Psychology?
     
  14. mountaindew5011

    mountaindew5011 Member
    Messages: 31

    it ticks a lil from the top end after it warms up but has bout 35-40 oil psi. after operating temperature not a rocker "clatter" im thinking lifter. and figure why im in there get a cam and a double roller timing chain.
    ANY1 know if a loped idle would reduce engine life dramatically?

    The duallt has a th400 in it any suggestions to make it any better i.e- ext. cooler, shift kit?
     
  15. mountaindew5011

    mountaindew5011 Member
    Messages: 31

    B&B if im just plowing with the dually even though its lifted should i still consider the box brace?
     
  16. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    Definitely...even more so if it's lifted. Adding the weight of a snowplow and then twisting the rig around in driveways and/or accounts puts more stress on it than just about anything else you'd ever use it for. Money well spent.
     
  17. mountaindew5011

    mountaindew5011 Member
    Messages: 31

    i looked at the kit and it looks pretty straight forward for the install. kinda pricey but no one really sells it for cheaper that i can find!!
     
  18. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    Don't look at it as being expensive, look at it as being preventative. As once the box is torn loose and hanging by a thread the truck then becomes a 7500 lb paperweight dead in the water.
     
  19. mountaindew5011

    mountaindew5011 Member
    Messages: 31

    any word on the frames cracking around the rear shock theres a k5 blazer at my work on thejunk stack cause of frame cracks at all four corners????????????/
     
  20. Zigblazer

    Zigblazer Member
    Messages: 79

    I've seen many 400 small blocks swapped into later 80s trucks. The TH400 is stock for the truck, but it would have came with a Part Time NP205 t-case. I've never seen a NP203 case swapped in. I also have never seen a 10 bolt swapped in place of a Dana 60, but from the sounds of it you do have the Dana. If it has locking hubs the the 203 is definitely not factory. If it is a cast iron t-case you can tell the difference easily. Just lock the hubs and go to a gravel road to see if you can spin the tires in any of the t-case positions. If you can then it isn't the 203. Or you can unlock the hubs and try to move. It will only move in 4lo Locked and 4hi Locked, un-locked will just spin the front drive shaft if it is a 203 and not move. Un-locked makes it basically a differential between the front and rear driveshafts and power will go to the path of least resistance (which would be the front if the hubs are unlocked.

    NP203 positions are;
    4lo Lock
    4lo un-locked
    N
    4hi un-locked
    4hi locked

    NP205 positions are (4wd is always locked for the 205);
    4lo (locked)
    N
    2hi
    4hi (locked)

    Anyway the 70s and 80s Solid Axle 1-tons are about as good as you can get. The chevy's had the strongest Dana 60's built, that didn't have the mass problems the newer ford and dodge dana 60's have now. The 1-tons didn't have the problem of cracking the frame at the steering gear or ripping off the shock mounts that the 1/2 tons or 3/4 tons did. Unless you had much larger tires or a large lift They actually used a heavier frame than the 3/4 tons unlike today's trucks.

    I just got my '87 1-ton a couple months ago, and got it all fixed up mechanically. I have $3,500 into it and it is running great now. It should be a great plow truck, especially since I only plow my driveway and my neighbors occasionally.

    If you have any questions about it let me know, the 70-80s chevy trucks are the ones I grew up loving. Which is why I built my '73 3/4 ton in high school, and searched to find an 87 1-ton to plow with, I like how the fuel injected trucks start in the winter and they only used the Dana 60s in a couple years with fuel injection.