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driveshaft and 14B FF

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by CaptCrunch, Nov 26, 2001.

  1. CaptCrunch

    CaptCrunch 1/2 ton status

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    Basically I'm pondering going to a 14B FF out back but heard that the 14BFF has about 2 more inches of pinion thus I'd need to shorten my current shaft... so can anyone confirm or falsify this? I'm not really looking to shell out anymore money into this shaft. If it is the case I may go fixed yoke if I can find one and a one ton CV from Jess. Thanks in advance

    -Mikey
    1987 Chevy K5 Blazer- 350 TBI
    <a target="_blank" href=http://coloradok5.com/gallery/captcrunch>http://coloradok5.com/gallery/captcrunch</a>
     
  2. wakedog

    wakedog 1/2 ton status

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    Hey mikey hows it goin?? Driven with only 2 wheel drive was fun day. ( We got like 8inches of snow). Well for the drive shaft then i dont think it needs to be shorten, at least on mine it didn't. Because with the lift you need it lengthened but then the 14b evens it out. Where you thinking of using your slip yoke cv out back??

    <a target="_blank" href=http://www.bigredjimmy.iwarp.com>http://www.bigredjimmy.iwarp.com</a>
     
  3. CaptCrunch

    CaptCrunch 1/2 ton status

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    hahaa! You too huh? I was also stuck w/ 2wd only [​IMG]. Dumb axle shaft up front... grrr. Yeah I found a sweet deall on a 14B FF rear and was debating on keeping the slip yoke. It has an inch of yoke showing and it is almost the same size as the stock shaft. I normally would just get it shortened an inch, but already got enough into it and I really want to go with one of Jess's One Ton CV's and a non-slip yoke case. I dunno though... I'm not looking to shell out 1500 bucks for a 241, tailshaft kit, and CV. I will have to make up my mind by tomarrow.


    -Mikey
    1987 Chevy K5 Blazer- 350 TBI
    <a target="_blank" href=http://coloradok5.com/gallery/captcrunch>http://coloradok5.com/gallery/captcrunch</a>
     
  4. BorregoK5

    BorregoK5 1/2 ton status

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    I'm making the same upgrade that you are. The pinion is 2" longer than a 12 bolt and will take up the slack of a 4" lift with a stock driveshaft. If you 4" shackle flip your truck on the same driveshaft it loses another 1/2" to 1" and may prove too long. Its a good time to take advantage of the larger yolk on the 14b and get a 1 ton spicer or saginaw style CV with a slip yolk or compatible transfer case yolk. I've seen CV shafts for $190 + $38 for a larger tcase yolk... decent strength - no vibration.

    I started with nothing and I still have most of that left! - <a target="_blank" href=http://www.echobit.com:81/k5/> Pictures</a>
     
  5. CaptCrunch

    CaptCrunch 1/2 ton status

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    Normally I wouldn't care but cash is really tight for me right now and I have a 700R4 and 208 case... so basically I have no real good or cheap way to convert to a non-slipe yoke. At this point I really don't want to shell out 1500 bucks to go to a one ton CV and non-slip yoke converted 241. [​IMG] I also don't want to loose my recently redone 700r4 either (Love that OD and steep 1st gear). I was talking to a member w/ a converted 208 but even that would be a rather spendy deal.

    The more I hear and look the more I seem to be looking to keep my beefed 12B

    -Mikey
    1987 Chevy K5 Blazer- 350 TBI
    <a target="_blank" href=http://coloradok5.com/gallery/captcrunch>http://coloradok5.com/gallery/captcrunch</a>
     
  6. ftn96

    ftn96 1/2 ton status

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    Mikey, maybe someone will come along with a good deal on a 241 for ya, then get the conversion and the shaft from Jesse. You WONT be dis-appointed.
    Might want to talk to Steve. I know he's planning on a TH400 and a doubler. Maybe he can sell you his 241.

    Surgeon General's Warning:
    Viagra and steroids may be harmful to your spouse![​IMG]
    <a target="_blank" href=http://www.nashvillek5.freeservers.com>www.nashvillek5.freeservers.com</a>
     
  7. CaptCrunch

    CaptCrunch 1/2 ton status

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    [​IMG]Actually Chaz88k5 has a sweet deal for a 208 converted case last I heard and I would probably go that route if he has it. But I'm still looking at a grand to convert over... since you were on the edge for a while you think the fixed conversion was worth it?

    -Mikey
    1987 Chevy K5 Blazer- 350 TBI
    <a target="_blank" href=http://coloradok5.com/gallery/captcrunch>http://coloradok5.com/gallery/captcrunch</a>
     
  8. OFFRDK5

    OFFRDK5 1/2 ton status Premium Member

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    So I take it if you stay at stock height and goto a 14bff you have to change the driveshaft? Or will it work?!?!

    SK-15
    J**P...it's whats for dinner!
    Roads? Where we're going, we don't need any roads!
    If it wasn't for bad luck I would have no luck at all!!
     
  9. BorregoK5

    BorregoK5 1/2 ton status

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    If you stay at stock height and swap in a 14b, your pushing your luck without shortening your driveshaft.

    I started with nothing and I still have most of that left! - <a target="_blank" href=http://www.echobit.com:81/k5/> Pictures</a>
     
  10. CaptCrunch

    CaptCrunch 1/2 ton status

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    That's kinda what I'm wondering.... at least w/ a slipe yoke (Because you have to worry more about the shaft being too long and bottoming out). Anyone? Bueller... bueller... [​IMG]

    -Mikey
    1987 Chevy K5 Blazer- 350 TBI
    <a target="_blank" href=http://coloradok5.com/gallery/captcrunch>http://coloradok5.com/gallery/captcrunch</a>
     
  11. ftn96

    ftn96 1/2 ton status

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    HELL yes it was worth it. No regrets!
    It was by far the easiest mod I have ever done. I feel totally confident that I aint gotta worry about the rear shaft falling out of the truck now. SMooth, let me tell ya about smooth,
    Can you say Cadillac? Even at speeds up near 90, smoother than 2 month boy's arse!!!!
    Did I mention, PURDY? [​IMG]

    Surgeon General's Warning:
    Viagra and steroids may be harmful to your spouse![​IMG]
    <a target="_blank" href=http://www.nashvillek5.freeservers.com>www.nashvillek5.freeservers.com</a>
     
  12. wayne

    wayne 3/4 ton status

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    I have a little over 5" of lift in the rear (flip, 1" zero rate, plus the 14ff gives a little lift over a 10 bolt) and the stock rear shaft in my 89 with a th700/241. The shaft is about a 1/4 to 1/2" out farther then it was with no lift and the 10 bolt.

    See <a target="_blank" href=http://coloradok5.com/gallery/Waynes-Toy>Project Mighty Mouse</a> here.
    <font color=blue>Wayne<font color=blue>
    <font color=blue>Happy Trails<font color=blue>
     
  13. CaptCrunch

    CaptCrunch 1/2 ton status

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    Thanks for the input wayne... so you did notice a bit more lift from the 14B? Wasn't sure if that was just the d60 fronts and one ton models or not. You think maybe a 1/2" gain?

    Thanks guys. Wes is gonna help out by taking some measurments on one of his 14B's and gonna compare them all the way arround. I think that is gonna have me SOL though [​IMG]. There are just too many variables... among then being what else has been done to the truck like shackle flip, tcase drop etc. If I end up doing the swap I will definetly update what the results were.

    -Mikey
    1987 Chevy K5 Blazer- 350 TBI
    <a target="_blank" href=http://coloradok5.com/gallery/captcrunch>http://coloradok5.com/gallery/captcrunch</a>
     
  14. californiak5

    californiak5 1/2 ton status

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    I don't know about the 3/4 ton 14B, but the one that I have off of a 1 ton is exactly 1 inch difference then my 12B. That is from the center of the axle tube to the top of the spring perches. The same is true on the D60 compared to my D44 front.

    I know you were not looking for this info, but I thought I would just throw it out there. [​IMG]

    See Ya,
    Keith

    <font color=green>Born to Drive My K5</font color=green>

    <a target="_blank" href=http://coloradok5.com/gallery/californiak5>CaliforniaK5's Pictures</a>
     
  15. wayne

    wayne 3/4 ton status

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    I never did measure the difference from a 10 bolt to a 14ff but just going by the diameter of the tubes would give some lift and also if you get a 14ff with the stamped steel perch instead of the cast perch there is about a 1/4" difference between them the stamped being taller. Just another note and someting I forgot to mention is my t case is dropped 2".

    See <a target="_blank" href=http://coloradok5.com/gallery/Waynes-Toy>Project Mighty Mouse</a> here.
    <font color=blue>Wayne<font color=blue>
    <font color=blue>Happy Trails<font color=blue>
     
  16. thatK30guy

    thatK30guy 1 ton status Premium Member

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    Mikey, I went out and did the measuring between the 10 and 14 bolt axles laying outside. The results are surprising!! [​IMG]

    There is no difference as far as the length of the pinion sticking out forward between the two. Both have the u-joint caps at the same distance as the other.
    Now while I did not measure to compensate for the spring perch height, the rest of the measurements were dead on.
    So it comes to my conclusion that you CAN reuse the same stock rear driveshaft without doing any modifications as far as shortening goes.


    Hope that helped and settled some doubts. [​IMG]


    I'm not picking my nose...I'm just pointing at my brain!! [​IMG]

    <a target="_blank" href=http://coloradok5.com/gallery/thatK30guy>The K30 Collection</a>
     
  17. CaptCrunch

    CaptCrunch 1/2 ton status

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    Thanks keith... I was pondering that info as well [​IMG]

    -Mikey
    1987 Chevy K5 Blazer- 350 TBI
    <a target="_blank" href=http://coloradok5.com/gallery/captcrunch>http://coloradok5.com/gallery/captcrunch</a>
     
  18. CaptCrunch

    CaptCrunch 1/2 ton status

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    Thanks a ton Wes... I really appriciate it. Did you measure off your K30 and Blazer? I hopefully gonna get a chance to go check this bad boy out tomarrow if the roads aren't too messy.Thanks again for everyone's help.

    -Mikey
    1987 Chevy K5 Blazer- 350 TBI
    <a target="_blank" href=http://coloradok5.com/gallery/captcrunch>http://coloradok5.com/gallery/captcrunch</a>
     
  19. woody9

    woody9 1/2 ton status

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    I'll vouch for what Wes said. Did an 80 14FF in my 91 sub with a 10Bolt... check, rechecked and checked again, and only 'change' was using the NAPA 447 U-joint. Length was 'dead-on' for the drive shaft. (1 piece BTW)
     

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