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doubler kit...

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by vicar4437, May 13, 2000.

  1. vicar4437

    vicar4437 Registered Member

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    ok, so i like the 205, and i can double it with a 203.... any other cases i could match with a 205, and get close to the same results?

    please buy my truck so i can own a chevy... im not worthy
     
  2. BB454

    BB454 1/2 ton status

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    ????? Hope your exam papers are more complete than your posts mate. Could not make out what you're saying.

    BB454
    IF IT DOES NOT HAVE 8 PISTONS - IT'S BROKEN !
     
  3. 72junker

    72junker Registered Member

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    I think we're talking about the offroad designs transfer case doubler. You have to use the np203 gearbox, to which you attach an adaptor that looks like the back of a th350 or a 700. You can then use any case that will bolt on to these trannys, but the size of the case will effect driveshaft length and angle and other stuff. The offroad design site has a full brakdown of components and lengths so you can figure out what you want to use. The kit's about $700 and the custom shifters about $150, plus transfer cases.

    And I really really want that 4:1 low range.

    later

    Troy
     
  4. blazer72

    blazer72 1/2 ton status

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    you can all so make tha back of the 203 look like a t400 too. I have the first and I think the only one that behind a NV4500, We also used the T400 stile 203 this makes the doubler just as short as it can be I still have a rear drive shaft thats 23.5 inches long! This works fine and the angels are not bad at all. I also ended up with 7 motor mounts! It really nice to slow the Blaze down to a slow walk keeps from spilling my coke, plus you get the power to pull down a big tree 1st low is 6.34X2.01X1.98x3.73=94.2 to 1 I love this !!!!!!!
     
  5. titanic

    titanic 1/2 ton status

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    you can put the doubler on a 465 4-speed as well
     
  6. blazer72

    blazer72 1/2 ton status

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    You can put it on any thing the 203 will bolt to!!!
     
  7. laketex

    laketex 3/4 ton status

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    I don't know if you have this link, but offroad designs makes the doubler and has pretty good info on this on their web page.

    http:// www.offroaddesign.com

    hope this helps!

    [​IMG][​IMG]
    Durant, Ok
    '79 Blazer in progress
     
  8. Wraparound

    Wraparound Registered Member

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    Does a doubler allow for higher gearing and better mileage as well?
     
  9. blazer72

    blazer72 1/2 ton status

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    I left the stock 3.73 gears in mine and with the Overdrive 5 speed, 35 inch BFG A/T the motor turns 1800 to 2000 at 75 to 80 MPH, getting around 24 MPG. Thats the point of it! You can keep the higher gearing yet gear way down off road.
     
  10. Wraparound

    Wraparound Registered Member

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    Is this in your 72? I'd like to get my hands on a 5 speed. I like to drive fast and this granny four will kill me on mileage. The blazer is still in peices and I'm building it from the frame up and I want everything perfect.
     
  11. blazer72

    blazer72 1/2 ton status

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    I run the NV4500 both grany low and over drive Too!!! 6.34 low to .73 over drive much the same as the old 4 speed just has the over drive 5th.
     
  12. Thumper

    Thumper 1/2 ton status

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    ya, good idea and Id love to have it but $700.00????? Thats ludicrous! Waaay out of my price range.

    Mike


    <font color=blue>Thumper
    85 Fullsize Jimmy
    [​IMG]
    <font color=red>Lets Go Wheelin! </font color=red>
     
  13. blazer72

    blazer72 1/2 ton status

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    thats not bad when you find out that the NV4500 cost me about 2000.00
     
  14. 72junker

    72junker Registered Member

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    Hey Blazer72, are you running a suspension lift as well? I want to go 4" on the junker w/ the doubler kit th350,203 gearbow, 205 case and was wondering if I'll need custom shafts.

    Troy
     
  15. Mudzer

    Mudzer 1/2 ton status Author

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    I agree with ya Thump. I will have to shell out the cash though. I have way too many rocky hill climbs calling my name... I guess it is not as much as a good winch.



    <font color=red>Mudzer</font color=red>
    1978/91 K5 Blazer
     
  16. titanic

    titanic 1/2 ton status

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    You'll have to get new shafts custom made with any Doubler setup. I've got the 4-speed version and had to lower my 205 transfer to keep the original downward slope of the drivetrain toward the rear diff. about 1.5". Just thought some might want to know
     
  17. blazer72

    blazer72 1/2 ton status

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    You have to run a 1 inch body lift to get the doubler to fit and yes you must do a lot of work on drive shafts! The 205 moves back about 13.5 inches!!!! I dont run any lift other than the body lift. I used the stock front drive shaft with a jack shaft and a carrer bearing . this keeps the front drive shaft out of the cross member. the rear drive shaft is all of 23 and 3/8th long!!!!!! I can send you or any one some photos.
     
  18. blazer72

    blazer72 1/2 ton status

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    I all so changed the rear shaft to a CVC at the 205 end this way I could keep the 205 up as high as I could as it is the low point.
     
  19. 72junker

    72junker Registered Member

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    Photos would be appreciated, though I'm quite a while away from custom running gear, gotta get the basics working first. Gotta find the artice, but one of the mags used the doubler in "Project:Blazer" a few months ago and I think they came up 1 3/4" shorter than stock. Can't recall the setup, though. I'm sure 90% of people here know the article.
     
  20. Brady

    Brady 1/2 ton status

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    Blazer72 did you use the 4 speed adapter and 205 or the auto adapter and 205?I am wanting to put a doubler in my '73.My plan is to use the 4speed 203 with the auto 205 and adapter.This is a little shorter than the 4 speed adapter and 205.Also the '73 and up Blazers have a 2" longer wheelbase than the '72 and older Blazers.This helps alittle.Brady
     

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