1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

14 bolt FF compatibility

Discussion in 'Differential & Driveline' started by redneck_reed78, Jun 27, 2020.

  1. redneck_reed78

    redneck_reed78 Full Access Member

    Posts:
    148
    Likes Received:
    32
    Joined:
    Sep 14, 2015
    Location:
    Spring Valley WI
    First Name:
    Braden
    Truck Year:
    1987, 1991
    Truck Model:
    R30, Suburban
    Engine Size:
    350
    Is everything identical between a 14 bolt FF from a 87 C20 and from a 1998 truck?
     
  2. AuroraGirl

    AuroraGirl Supporting Member Supporting Member

    Posts:
    1,392
    Likes Received:
    733
    Joined:
    Sep 8, 2019
    Location:
    Northern Wisconsin
    First Name:
    Taylor
    Truck Year:
    1980
    Truck Model:
    K2500
    Engine Size:
    5.7
    i believe 1998 or there abouts rear disc was an option/maybe standard, so some differences in hardware already on. also consider gear ratio... also consider LSD, etc
     
  3. yevgenievich

    yevgenievich Full Access Member

    Posts:
    3,964
    Likes Received:
    1,543
    Joined:
    Mar 1, 2014
    Location:
    Texas
    First Name:
    Viktor
    Truck Year:
    1991
    Truck Model:
    V2500 burb
    Engine Size:
    5.7
    Spring perches different location. But shock mounts seem to actually line up fairly well. Just put a disk brake version of a 14bolt FF in 85 gmc
     
  4. Vbb199

    Vbb199 B-rate Hillbilly Customs Supporting Member

    Age:
    26
    Posts:
    2,726
    Likes Received:
    3,061
    Joined:
    Jan 12, 2018
    Location:
    Salisbury NC
    First Name:
    Vince
    Truck Year:
    91, 89, 87
    Truck Model:
    91 Blazer V1500- "K5ton", 87 K10 Suburban, 89 Suburban R1500
    Engine Size:
    502, 350, 350
    99.5-06 would've marked a difference in axle housing, larger tubes, slightly different shaped pumpkin, disc brakes, perch locations change.
    Axle shafts, carrier and all stays the same.

    IMO they're the more diserable of all of them, with a little bit of fab work, you can make your own perches and swap them into anything.
    Overall they're just beefier than the early models with drums.


    As far as the 98, perches change locations I believe.
     

Share This Page