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Drive shaft length w/ 14 FF

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by MudFrog, Jul 12, 2001.

  1. MudFrog

    MudFrog 1/2 ton status

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    Is anyone running a 14 FF on a stock height ride? I'm planning on going ahead and installing the axles before I lift the vehicle... is the pumpkin to long? In other words... will I have to shorten my drive shaft or is there enough play? I have an NP241 / 700R4.

    89 K5 Silverado
    <A target="_blank" HREF=http://mudfrog.rockcrawler.com>http://mudfrog.rockcrawler.com</A>
     
  2. woody9

    woody9 1/2 ton status

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    just crossed this bridge on a 91 suburban, but did that math a bit different.
    Measured from existing axle centerline to U-joint flange on old axle. (12").
    Measured from NEW 14 FF axle centerline to new U-Joint flange. (12").
    No lift. No problem. (so far)... outside of.... with the gear change that came with this, i'm turning the shaft a bit more now (3:54 -&gt; 4:10s) so i have some vibration around 50 & above. It goes to Ye Old Drive Shaft Shoppe tomorrow. Est cost of balance: $38.00 (if i remove it).
    Hope this helps
     
  3. MudFrog

    MudFrog 1/2 ton status

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    Hmm... I never thought of the balancing.... I'm going from 3.42's to 4.10's... thanks for the comment!

    89 K5 Silverado
    <A target="_blank" HREF=http://mudfrog.rockcrawler.com>http://mudfrog.rockcrawler.com</A>
     
  4. woody9

    woody9 1/2 ton status

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    oops.. yep that's what i came down from... (i miss my memory!)... it also gave a 20% diff in speedo! which, in performance terms, is (or in my case was) a wash), but doing an indicated 85 (pegged), I'm actually doing about 68.....
    Superlift has an adapter listed, i emailed the question, and they said for my year (91/350/700R4,241) that with the elec speedo, and gauge, there were 2 GM part nr's i needed. One is an adapter the other a module to go between (as I understand it) and you clip certain connections off depending on the config you have. Not really a problem, but.. i hate to see 120% of my miles now added on a vehicle with 150K already! it'll put it thru the roof! (and i gotta remember how to adjust it for maint purposes & speeding tickets!)

    But do love the 4:10 vs 3:42 ratio performance difference!!!!!!
     

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