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New gears

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by flyndragons, Jun 6, 2002.

  1. flyndragons

    flyndragons Registered Member

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    ok guys, now I'm looking at gears. I'm thinkin about 4.56's. I hear they are great for runnin 35's but I was wondering if 4.88's wouldnt be better for it. I've got a 350 and a 700r4.

    What do ya think guys?
     
  2. muddysub

    muddysub 1 ton suburban status Staff Member Moderator GMOTM Winner

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    i've got 36" TSLs and i'm going to 4.56s but i don't have OD. with OD i think you'd be just fine. mudbogAD runs 4.56 with 35"s but he don't have OD either. if it were me i'd go for it and get 4.56s. do you plan on going to a bigger tire someday?
     
  3. flyndragons

    flyndragons Registered Member

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    But wouldnt 4:88's be better? I'm just curious. I figure if I'm gonna do it, I'll do it right the first time.
     
  4. Swanson52

    Swanson52 1/2 ton status

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    How you use it would dictate wether or not to go with the 4.88's. If you have it on the road often, go with the 4.56's. Conversely, if it is mostly a off-road rig, get the 4.88's. AND-if you're like most of us-you probably will be getting bigger tires later, and already having the 4.88's would save some hassle.
     
  5. little79k5

    little79k5 1/2 ton status

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    4.56's to me would be a good choice. i wouldnt run 4.88's unless you are going to run a 38"-40" tire.
    there is nothing better about 4.88's over 4.56's, it depends on what your doing with it. im gonna be running 4.56's on 38.5" tires here soon because mines a daily driver. 4.88's would be overkill for 35's

    keith
     
  6. Diesel Dan

    Diesel Dan 1/2 ton status

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    I running 4.56s with a 4L80E. After driving the truck 600 miles thru the mountains in PA, I don't thing 4.88s would be all that bad. IIRC, the 700 has a taller OD the the 4L80E also. Rough calculations put RPM @2500 @70.
     
  7. Blazinaire

    Blazinaire 1/2 ton status

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    What axle's do you have? My $.02 : If you have 1/2 ton axle's, they can't handle a tire that is so large as to require 4.88's. So if you are planning on going to a bigger (like 37''+) tire that would need 4.88's, wait untill you get one ton axle's to go to 4.88's. Also I have noticed that in my front 10 bolt, the pinion gear is about as small as I would allow (4.56) and they only get smaller after that. If your rig is a daily driver I wouldn't go with anything lower than 4.56's and 35''s with OD, this is the setup that I run.
     

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