Dismiss Notice

Welcome To CK5!

Registering is free and easy! Hope to see you on the forums soon.

Score a FREE t-shirt and membership sticker when you sign up for a Premium Membership and choose the recurring plan.

Interesting find: high gears in a 14FF...

Discussion in 'The Garage' started by thatK30guy, Jan 27, 2007.

  1. thatK30guy

    thatK30guy 1 ton status Premium Member

    Joined:
    Jan 12, 2001
    Posts:
    32,076
    Likes Received:
    55
    Location:
    .
    Whats the highest (numerically lower) gears you have found, seen or heard of in a 14FF?

    Last night while at a buddies shop, we decided to pull off the drums on his 1980 K20, which of course, came with the 10 bolt front and 14FF rear.

    I had owned this truck before I sold it and he got it later from the buyer I sold it to. We had all known from the PO that I bought it from that it had HIGH gears in it. So last night we decided for $h!ts and giggles, to pull the covers off and find out exactly what ratio they were. We were in a shock after the covers were removed.

    In the 14FF, the stampings on the ring gear showed 14 and 45. Did the math and came up with 3.22 ratio.

    In the 10 bolt, the stampings were 13 and 42. That came out to 3.24 ratio.

    Now the big question is: has anyone else ever seen or heard of this ratio in a 3/4, or even 1 ton?

    We were all standing around like fools, dumbfounded, with our jaws on the floor. We all agreed that we've heard of 3.42's and 3.73's but never heard of 3.22 or 3.24.

    Anyone else care to pitch in and elaborate? Would this kind of ratio be a super rare set that may be worth something on eBay? Opinions please....
     
  2. k204dr

    k204dr 1/2 ton status

    Joined:
    Aug 27, 2004
    Posts:
    463
    Likes Received:
    0
    Location:
    TN
    wanna sell those? i've heard of them but don't see them much. i've got a 3.42 rear in my truck.
     
  3. thatK30guy

    thatK30guy 1 ton status Premium Member

    Joined:
    Jan 12, 2001
    Posts:
    32,076
    Likes Received:
    55
    Location:
    .
    My buddy says that if he decides to scrap the truck, then he will give me the ok to sell them for him. We are still doing investigations on this odd ratio. He's a full-time mechanic and has never heard of this ratio for the GM 3/4 tons.
     
  4. nvrenuf

    nvrenuf NONE shall pass! Premium Member

    Joined:
    Jan 7, 2002
    Posts:
    13,073
    Likes Received:
    245
    Location:
    Mobile, Al.
    I've seen a set of 3.22's before in a Burb (can't remember the year), definitely rare stuff.
     
  5. 4xcrazy

    4xcrazy 3/4 ton status

    Joined:
    Oct 31, 2003
    Posts:
    9,471
    Likes Received:
    5
    Location:
    Olympia/Lacey, Washington
    how about a set of 2.29's in a car rear :crazy:
     
  6. bowtiepower00

    bowtiepower00 1/2 ton status

    Joined:
    May 11, 2000
    Posts:
    924
    Likes Received:
    0
    Location:
    AZ
    Yes, I have heard of 3.23's in a 14FF. 3.42's also. I would like to build a Burb or other rig, 2wd with a 4BT, NV4500, and 3.23's. I think you could really get some mileage from a setup like that.
     
  7. Russell

    Russell LB7 Tahoe Status Premium Member GMOTM Winner

    Joined:
    Jun 23, 2000
    Posts:
    7,922
    Likes Received:
    333
    Location:
    Fort McMurray, Alberta
    I've got a 10 bolt front with 2.56 gears in it, 41 teeth on the ring gear, and 16 on the pinion, yes I counted serveral times, lol
     
  8. Currank5

    Currank5 1/2 ton status

    Joined:
    Apr 4, 2006
    Posts:
    244
    Likes Received:
    0
    Location:
    South Dakota
    Those ratios are around. Not the most common esp. in a 14 bolt. RPO code GU5= 3.23 ratio. When i got my blazer i found out i had 2.73 gears. Wish i had checked that out when i got it but i was just happy to get a good deal on another blazer.
     
  9. big83chevy4x4

    big83chevy4x4 3/4 ton status

    Joined:
    Mar 22, 2002
    Posts:
    6,587
    Likes Received:
    0
    Location:
    Sheridan, Michigan
    a buddy of mine had 3.23s in a 3/4 ton axles, it was a 14bsf though. i always thought that 3.42 was the lowest in a 14bff.
     
  10. FOR MUD

    FOR MUD 1/2 ton status Premium Member GMOTM Winner

    Joined:
    Apr 6, 2006
    Posts:
    2,801
    Likes Received:
    387
    Location:
    Clayton Del
    I know the the lower the gear the higher the GVWR. Check the specs on the truck and see what it is.
     
  11. atho

    atho 1/2 ton status

    Joined:
    May 14, 2003
    Posts:
    1,115
    Likes Received:
    0
    Location:
    Wayne County, Ohio
    I saw a 80's 2wd suburban at the jy with a 3.23 14b ff. (the diff cover was off, gears were rusty)
     
  12. Hossbaby50

    Hossbaby50 3/4 ton status

    Joined:
    Sep 1, 2001
    Posts:
    8,972
    Likes Received:
    0
    Location:
    Peoria, AZ
    I remember a few years ago Ddraggoon said he had a 14bff with 3.23's in his Suburban.

    Harley
     
  13. Drey

    Drey 3/4 ton status

    Joined:
    May 8, 2003
    Posts:
    8,288
    Likes Received:
    0
    Location:
    Iowa
    im still anixous to tear into the 10 bolt on my K10...3.08s at least but it felt higher geared then another kids truck who had 3.08s, He thought I might have 2.80 somethings
     
  14. dyeager535

    dyeager535 1 ton status Premium Member

    Joined:
    Dec 13, 2000
    Posts:
    26,976
    Likes Received:
    189
    Location:
    Roy WA
    I have the 10 bolt 3.23 gears out of a 3/4 ton truck that was 14FF in the rear.

    Never seen any numerically lower thn that in a 14FF though. 14SF for that matter either.
     
  15. u2slow

    u2slow 1/2 ton status

    Joined:
    May 9, 2001
    Posts:
    2,217
    Likes Received:
    0
    Location:
    BC Canada
    I run 3.21 in the 14bFF in my Burb. Seems it shows up in bigblock trucks.
     

Share This Page