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How strong is NP208? Need Slip-Yoke Eliminator?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by rich, Sep 6, 2000.

  1. rich

    rich 1/2 ton status

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    Hey.

    I just bought an '84 K5 with an SM465 and NP208. I'm thinking of swapping this into my '76 K5 (strictly off-road, regularly abused). Of course I love the SM465, and I like the 2.6:1 Low Range of the NP208, but I'm worried about it's strength.

    1) How much abuse can the NP208 take? My '76 has a stock 350 and I'm running 33" tires with lockers front and rear, and I plan to go to larger tires at some point. Do I need to worry about breaking the NP208?

    2)I have a 4" lift. Would I need to get a slip-yoke eliminator (SYE) kit for this T-case and get a telescoping driveshaft? Who makes a SYE kit for the NP208?

    Thanks!

    Richard
    '76 K-5 Blazer
    '90 K-5 Blazer
     
  2. tom

    tom 1/2 ton status

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    Rich,
    I can't help much, but recently bought a '91 with sm465 and 241 case (nearly identical to 208). With advertised 2 inch lift that is actually more like 3.5", the driveline is OK without the yoke adapter. U-joint angles are 13 degrees. Don't know about the strength yet, but the truck has 170,000 and the case is still tight. What bothers me is the amount the t-case hangs down. By the way, the case was dropped 1 inch with spacers between the cross member and the frame.
     
  3. Grim-Reaper

    Grim-Reaper 3/4 ton status Author

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    SHould be fine as it stands. I know 2 people who are running 208's in oler trucks and both are pretty tough on equipment. One is in a 72 Blazer and I knick named the guy Nuetral Drop. He thinks nothing of holding 3000 rpm and going reverse to drive without lifting and he hasn't managed to break it yet and he runs double ARB's. He has a built 327 thats pushing 400hp. He loves poping wheelies in the truck...not kidding he hits about 6 inch bumps and carries the front wheels 10-20 feet at a time (Henry S BigJbear). Another bud has one in his 76 short bead again double locked. Never had a problem. The key they tell me is to keep them serviced. Another plus is they have a 2.6 to 1 lowrange. the 203 has 2:1 and a 205 has 1.9:1. Both the 203 and 205 are concidered much stronger cases true but if your getting a good deal I would go for it. I'm looking at swapping a 700r4 and a 208 into my wifes 79 right now.

    Diging it in the dirt with my K5's
    Grim-Reaper
    http://grimsk5s.coloradok5.com/
     
  4. AZK5

    AZK5 1/2 ton status

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    An NP205 is a slip yoke eliminater for an NP208. Seriously the NP208 is fine for what you're doing. If you want, get something to plug the opening in the NP208 in case you break a rear driveshaft.
     
  5. 90K5

    90K5 1/2 ton status

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    I think the strenght of the 208 is underrated. The only weaknesses are the alum. housing, the slip yoke and if it gets low on fluid it gets messed up. Just keep it filled up and put a skidplate on if you dont have one. My 241 does i dont know about 208s. Make sure your driveshaft is the right length and that the slip yoke still has pleanty of travel and it should be good.

    90K5
     
  6. drivelineman

    drivelineman 1/2 ton status

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    try calling 337-527-1044 - ask for glen he might be able to help- the buis is called bayougeep -
     
  7. bosifus

    bosifus Registered Member

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    I have a 208 behind my truck running right at 300 hp and 35 in Remingtons and I have thrashed it pretty good, the only thing I have not replaced is the transfer case. I would definately make sure to get a skid plate on it though.Aluminuminum is soft...
     
  8. Emmettology 101

    Emmettology 101 3/4 ton status

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    I have beat my 208 pretty good for about 7 years now.

    HAve you found out if they make a slip yoke eliminator kit for the 208?

    Mike [​IMG]
    See <font color=green>EMMETT</font color=green> -&gt; http://emmett.coloradok5.com
     
  9. Donovan

    Donovan 1/2 ton status

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    I was at my brother house tonight and his friend had a 85 Dodge Ramcharger. The T/C is a 208 with a Fixed yoke. I don't know if the bolt pattern on the rear housing is the same but it was diffenently a fixed yoke. So if you guys get bored look into the Dodge 208.

    Donovan
     
  10. rich

    rich 1/2 ton status

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    Thanks for all the help guys!

    I'm going to get my parts K5 test-driveable this weekend and evaluate the condition of the SM465 and NP208. If they're solid, then I'm using them in my '76 without a SYE.

    Donovan - I just read last night that Ramchargers were made with 2 possible T-cases - an NP203, or else an NP207. Maybe that fixed-yoke NP208 you saw was an NP207? There's a RamCharger in my neighborhood, so I'll check it out this weekend.

    Later!

    Richard
    '76 K-5 Blazer
    '90 K-5 Blazer
     
  11. Donovan

    Donovan 1/2 ton status

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    No the T/C in the Dodge was a 208D. Which the d stands for is Dodge I believe. I think that the 207 came in the Mini Blazers/S10 trucks and Cherokee's. It is the little brother to the 208. So if you need a fixed yoke take a look. I don't know how many splines?

    Donovan
     
  12. Does anyone know the years Dodge ran those transfer cases?
    What all did they come in?
    Thanks.

    IF IT AINT BIG IT AINT BAD!!!!!!
     
  13. Donovan

    Donovan 1/2 ton status

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    It was probably just like the chevy. Probably from 80-87 in the 1/2 and 3/4 ton trucks and Ramchargers. Maybe not the 3/4 tons that could have been a 205 in them. Just have to look around I guess.

    Donovan
     

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