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4:10 or 3:73

Discussion in 'The Garage' started by d coenen, Aug 27, 2005.

  1. d coenen

    d coenen Registered Member

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    can someone school me on what gears to get for my blazer it has 35 s witha 350 and edelbrock intake holley carb and has 3:07 gears now. i noticed alittle power with the bolt ons but a buddy of mine said to go with lower gears. so i looked on ebay under 4:10 gears and showed all kinds of gears what should i look for and what is an alright price all i use my blazer is for is mud and driving up and down the creek bottoms.as you can tell idont know anything about gears.
     
  2. pauly383

    pauly383 Daddy383 Staff Member Moderator

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    If you are buying complete gearsets , I'd go with the 4.10's if you do highway driving without an overdrive . 4.56 with overdrive .

    Of course thats if I had coin to drop .
    I am using 3.73's since the complete axles were cheaper than regearing and they were local .
     
    Last edited: Aug 28, 2005
  3. moturbopar

    moturbopar 1/2 ton status

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    Hi, I have 3.73s with 33s and If I had to do it over again I would have gotten 4.10 maybe 4.56s.
     
  4. pauly383

    pauly383 Daddy383 Staff Member Moderator

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    Thats what I just said :confused:
     
  5. moturbopar

    moturbopar 1/2 ton status

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    Thats funny, when I started to reply there were no other posts. Someone called and didnt finish the reply till after the call. Weird how it came out almost the same :confused:
     
  6. cbbr

    cbbr 1 ton status GMOTM Winner

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    I run 4.10 with 35's and ino o/d. Very good combo.
     
  7. 4xcrazy

    4xcrazy 3/4 ton status

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    I am running 33's BFG M/T's with 4.10 gears and a 700r4, revs alittle high in 3rd on the highway, drops down a bit in O.D. personally, i would like to go back to 3.73's, but i definately like the low gears while off road.

    As far as a decent price on gears,,,it helps if we know what kind of diff's you are running,,, :dunno:
     
  8. 82K5_6.5L

    82K5_6.5L 1/2 ton status

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    check out 4wheel Parts for some gears, they are cheap (prolly not the best) but have a lifetime warranty.. get some 4.10's, they will make all the change in the world.
     
  9. Mad-Dog

    Mad-Dog 1/2 ton status

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    4.10's will turn 2829 at 70 mph and 4.56's will turn 3146 at 70 mph,
    I would run 3.73's with 35's on a street truck to turn 2574 rpm at 70 mph :bow:
     
  10. K30Blazer

    K30Blazer 1/2 ton status Premium Member

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    how did you figure this out? I am looking at the same thing right now. I just put 35's on my truck and currently run 3.42's with an OD. I am thinking 4.10's.
     
  11. Mad-Dog

    Mad-Dog 1/2 ton status

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  12. jmd4x4

    jmd4x4 1/2 ton status

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    I am going w/ 4.56 gears and running 36in tires. If you are not useing this for a daily driver then you should try to find some used gears. You can find them around $50 apease but you may have to get the carriers also.
    hope this helps

    later
    jmd
     
  13. Skigirl

    Skigirl 1/2 ton status

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    I have 4:10s in mine, (350 with a Th400 to np203) and I love it - I can also make good time on highway driving - I average 70-75 MPH with no prob.
     
  14. Greg72

    Greg72 "Might As Well..." Staff Member Super Moderator

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    I'd work it backwards....

    Do you have an overdrive gear? Calculate your highway speeds (and RPMs) with various gearsets and then choose the one that puts you in the correct RPM band for the highway speed you normally travel.

    It IS possible pick a gearset that won't allow your overdrive to stay in overdrive... (3.08s with 35's comes to mind! :D ) so it's not just a matter of picking the gearset with the lowest highway RPM. You want to make sure that your engine is able to produce decent power at the RPM you've chosen, to keep the tranny from downshifting out of OD all the time. For a SBC350, the target revs should probably be something like 2500....

    It's all tradeoffs of course...you can go a little "deeper" and spin some extra highway revs if you really want the low gearing for offroad.
     
  15. wildbilzrydn

    wildbilzrydn 1/2 ton status

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    I've got 35's and 3.73's. It has good cruising power at 70 mph, but I can still light em up in 2nd. I think its a good combo. If you plan on driving it all the time, I think 4.11's will cost you about 1 mpg. If your towing or in the mud all the time go with 4.11's
     

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