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Found a 14bff ...

Discussion in 'The Garage' started by Winter Hill Gang, Oct 20, 2005.

  1. Winter Hill Gang

    Winter Hill Gang Registered Member

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    with 3.73 gearing in it. I can get both front and rear ends out of this truck and that is drum to drum in the rear and rotor to rotor in the front.
    The donor truck is an '89 3/4 ton. From what I can tell, these should more or less bolt right up to my '85 jimmy.
    #1- Am I correct in thinking this?
    #2- Are 3.73's ok with 35" tires? (the truck has OD)
    #3- Do I need to purchase the front end complete, or can I just make do with the 10b I have now in the front and re-gear it to match the back?
     
  2. RootBreaker

    RootBreaker 3/4 ton status Premium Member

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    well this all depends.. I sold a pickup trailer yesterday to a friends bro... for $200.. had a 14bolt ff with 3.73's.....

    14bolts can be had around here for $50-$100 but this was a trailer..

    and he needed 3.73's so if he found one and it wasnt right... then $120 for gears, extra for labor and rebuild kit.. so for a drop in axle for $200 good price..... as he will re-sell the trailer and get his money back...


    how much can ya get the axles for?
    I say go for it...... :wink1:
     
  3. Winter Hill Gang

    Winter Hill Gang Registered Member

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    they are not that cheap, believe me.
    $1200 canadian for the set.
    That is the approximate going price everywhere up here. I wish I could get an axle for $200. :mad:
     
  4. Winter Hill Gang

    Winter Hill Gang Registered Member

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    ok, just picked up the local tri-ad and found an axle set for $400. I'm the happiest dude at work now. :D
    its got 4.10's in it.
    with 35" tires, what is that going to do to my RPM on the highway.
     
  5. RootBreaker

    RootBreaker 3/4 ton status Premium Member

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    nice score!!!!

    4.10's are good...

    you can go here..
    http://www.thedirtforum.com/rpmcalc.htm

    I put in 17.5 for ya on tires (1/2 of height)
    65mph & 4.11's and came up with
    2558rpms
     
  6. Winter Hill Gang

    Winter Hill Gang Registered Member

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    that doesn't seem too bad RPM wise. Its got a cammed 307cu.in. pushing it.
    Looks like I'll have a project next weekend. :D

    you guys sure are helpful!
     
  7. chevyin

    chevyin 1/2 ton status

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    Just thought i would toss in my 2cents, when doing the 14ff change in our 73 you have to move the spring perch and shock mounts .
     
  8. Winter Hill Gang

    Winter Hill Gang Registered Member

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    Is this something I will most likely have to do on my '85?
     
  9. Emmettology 101

    Emmettology 101 3/4 ton status

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    3/4 ton 14FF's have the smae pech width and shock moutns as your 85. 1 ton 14ff's have different perch widths and shock mounts. They will need to be moved.

    So if they are 3/4 ton axles, you're good. If the rear is a 1ton, then you need to do a little work.
     
  10. Winter Hill Gang

    Winter Hill Gang Registered Member

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    thanks.
    its from an '80 3/4 ton pick up.
     
  11. Kyle89K5

    Kyle89K5 1/2 ton status

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    Seriously bro, 4.10's and an OD w/ 35" tires, in my opionion, is the minimum. 4.56's are better, 4.88's are great. The difference in my truck after the switch from 4.56 to 4.10 was a relief. The truck was almost bearable to drive. Remember, you're gonna be dragging a HELLUVA lot more weight around than stock. Start saving for gears or a new tranny ;)

    KP
     
  12. RootBreaker

    RootBreaker 3/4 ton status Premium Member

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    did you say that backwards? you are contradicting yourself.... :haha:

    I have 4.56's and that is a max for me or i wont be doing any highway driving....

    i know someone that had a truck with 4.88's and 44's.... he went to 4.56's and liked it so much.. he said.. he would runout of gear with the 4.88's and the 4.56's were great..... but he had a stick ...

    antother guy I know had a ford on 44's.... 5.13's and automatic.. when NJ changed their lift laws... he took the body lift off leaving him with 12" lift and 38's and said the 5.13's were killing him.. he went to 4.56's and said that was the best gear....

    so all yall that keep recommending above 4.56's..... what gives???? do we really need them that low? guess some do and some dont..... if ya a mudder... you want high hp and alot of wheel spin... 5.13's will give ya less top end...... :crazy:
     
  13. Kyle89K5

    Kyle89K5 1/2 ton status

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    Nope, I said what I meant to :D

    With 4.10's I was hunting gears all over the place. Spent most of my highway time in 3rd to keep from hunting gears. Couldn't pull any kind of grade without a downshift. With 4.56's it was MUCH more bearable, 4.88's would have made me MORE than happy. The 700 likes to spin fast, getting the RPM's up a little doesn't hurt anything. I honestly thought that since I had 31's and 3.73's then 4.10's and 36's would net me at least decent miliage since the RPM's would be lower, WRONG on my part. The truck had to work it's ass off to maintain a decent speed, since being at a lower RPM, I was out of my trucks powerband (stock 350)

    Now remember, this is with an OD tranny. With a 350/400/465 all 1:1 at the top end, knock that down, 4.56's would have been perfect, 4.10's bearable, 3.73's a royal PITA LOL
     
  14. RootBreaker

    RootBreaker 3/4 ton status Premium Member

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    gotcha... cool.. I keep on fergettin bout yall overdrive punks :bow:

    all I know of about overdrive is what I can "DRIVE OVER"!!!! :haha:


     
  15. you from winnipeg?

    is your truck red
     
  16. 4xrick

    4xrick 1/2 ton status

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    with od you are bettter off with 4. 10s I and i just happen to have a set for sale. $350 but i am in seattle wa. not sure where your at but pm me if you are interested. i am all one ton now and no need for the 3/4 ton stuff anymore. I also have a 14bff with 373 gears in it for $100
     
  17. 89GMCSuburban

    89GMCSuburban 1/2 ton status

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    4.10's will be bearable. I have 4.10's with 36's and it's alright. I could ask for a little more with all the hills around here, but when I need it, it runs almost 3,000 RPM with OD off at 70. In OD, it goes down to about 2200 RPM. Cool stuff that you found the axles. Get the axles, have some U-bolts made, order some spring plates from LMC, and get a conversion u-joint at an auto parts store and call it a day!!
     
  18. darkshadow

    darkshadow 1 ton status

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    you said tri-ad, and canadian, must be from my neck of the woods, where you from what is your ride?
    welcome to the forum, be sure to check out the north forum, its wear canadians dont post much lol
     
  19. Winter Hill Gang

    Winter Hill Gang Registered Member

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    Right now I'm near London,ON. which is where I work.
    I just picked this truck up a few weeks ago. We had one way back when, when I was out west, and I just wanted another for old times sake. That and they just look soo badass. :D
    But as you can tell, it's a project vehicle.
     
  20. Winter Hill Gang

    Winter Hill Gang Registered Member

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    nope. I'm far from the Peg man. :D
     

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