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Gears or intake and cam

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by bajaviking, May 29, 2002.

  1. bajaviking

    bajaviking 1/2 ton status

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    What would you guys do? I run 33/1250 tires with 3.07 gears and a stock 350 engine that runs great. I am trying to decide if i should do a cam and intake swap or change to 3.73 gears. What do you think would give me the most difference in power, I don't have money to do both at this time, what would you do first?
     
  2. arq

    arq 1/2 ton status

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    change to 3.73s. i think seventy4blazer has the D44/12Bolt set.

    ARQ.
     
  3. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Gears.

    Making more power won't help if the motor is lugging...

    Rene
     
  4. bajaviking

    bajaviking 1/2 ton status

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    Is 3.73 a good ratio for 33 inch tires, this is my daily driver also. I have a 700 tranny with overdrive.
     
  5. arq

    arq 1/2 ton status

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    if you have the over drive, you could go with 4.11s. IMO i would go 3.73s with 33s

    ARQ.
     
  6. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    With overdrive you can go deeper...4.10's or even 4.56's. 4.56's, 33's you'd be turning 2300 RPM at 70 on the freeway.

    The 700R-4 will love you for the deeper gears...

    Also with 4.56's you could step up to 35's one day without worry.

    Rene
     
  7. dyeager535

    dyeager535 1 ton status Premium Member

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    I'm with Rene on the gear choices...if 4.56's put you in the low 2000's RPM wise at 70, then go for them. You *might* be ok with 4.10's, but as I've found on my (apparently stock) 350, 2300RPM is this motors cruising "sweet spot" and I can pull 70mph up any grade at that RPM....not to mention, the acceleration for passing is pretty darn good too.

    Definitely in your case gears before cam/intake though.
     
  8. JIM88K5

    JIM88K5 1/2 ton status

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    I smell a re-gear cookin...
    Jim
     
  9. UseYourBlinker

    UseYourBlinker 1 ton status

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    I have currently 33's,700r4,3.73 gears...I like it. But when I add my 4" springs and go to 35's I should be ok untill I get some cash and change the gears yet agian!
     
  10. Blazinaire

    Blazinaire 1/2 ton status

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    Gears!! Not 3.73's!! If you are keeping 33's, get some 4.11's, if you plan on EVER stepping up, 4.56's are nice. I run 4.56's with the 700R4 and 35''s and love it, no lugging of the motor, and it can still keep up with traffic on L.A. freeways. I would say that 4.56's would be a bit much for a 33'' even with OD, but you would be happier with 4.11's than 3.73's.
     
  11. four_by_ken

    four_by_ken 1/2 ton status

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    Just mentioning something that no one esle has.

    What about a set of 3/4 ton axles with 4.10 or 4.56s already
    in them. A step up in strength and would end up beoign about the same price overall.

    Ken H.
     
  12. bajaviking

    bajaviking 1/2 ton status

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    As Jim said, I smell a re-gear cooking. After reading your posts I think i will go for the 4.10's. I was thinking about the axle swap but I just put a lockright in my rear diff. and I only have to pay for the gears( my mechanic friend will install them for me) so until I break my lockright I think I will stay with the old setup.
     
  13. aandpman

    aandpman 1/2 ton status Premium Member

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    So get a 14bff rear and toss the lockright upfront in yur 10-bolt.....Hey - its a thought..../forums/images/icons/crazy.gif
     
  14. Seventy4Blazer

    Seventy4Blazer 3/4 ton status

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    cam and intake. marv springer runs 35's with 3.73. he has a doubler for the trail. i am sure you will end up doing both in the end but i would go with intake and cam first. it will cost less if you do the work yourself.
    grant
     
  15. Seventy4Blazer

    Seventy4Blazer 3/4 ton status

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    oh, and yes, i do have a set i would sell for a 12 bolt and D44.
    and my room mate has a set of 4.10 he might part with
    pm me if interested
    grant
     
  16. RedDwarf

    RedDwarf 1/2 ton status

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    OK, I'm going to be the oddball. You will notice a big difference if you do some motor work. A strong 350 will pull 33"s with 3.07's all day and not break a sweat.

    Probably should do a ring job too while you're at it. Sure brought my old hoss back to life!
     
  17. Chris_T

    Chris_T 1/2 ton status

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    Gears Gears Gears. You've got a 700, so 4.56's are like running 3.20s with a TH350 .. You have to try hard to over-rev a 350 with 3.07 gears in it. Plus, with the added weight of the wheels and tires a little mechanical advantage at the tires and a few more rpm from a standstill will help. By far my 4.56 gears are the best all around mod for running bigger tires, wish I'd done it sooner.
     
  18. 90K5

    90K5 1/2 ton status

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    i have 4.11's and 33's and love them in the city...on the highway, I wish I had 3.73's though. I'm gonna be driving this thing to college next year - a 6 hour drive - and wish I had done 3.73's...if no highway, go 4.11's
     
  19. 84_Chevy_K10

    84_Chevy_K10 Banned

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  20. txbartman

    txbartman 1/2 ton status

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    Gears is the way to go. I ran 3.73s and 32s for years, but they wouldn't cut it when I stepped up to 35s. Installing the 4.56s was the best thing I have ever done on my rig.

    Having a friend install them is going to save you mega-bucks. But, watch, help, and learn. It will be invaluable to you. i would also agree with the axle swap. If you have the time and money associated with a swap, then put in a 14BFF rear and put your lockright in your front 10-bolt. However, I know this costs a lot more than just the axle. You will have driveshaft and u-joint concerns. You will also have to either convert the front to 8-lug or have to deal with 2 spares. You will also have to get new wheels with 8-lugs.

    So, if all that is too much to take on right now, just go with the gears. Watch and learn so you will know how to set them up. Then, at a later date, you could always swap in a 14BFF and install matching gears yourself (if it didn't have the right gears already).

    I know 4.56s are overkill for 33s even with a 700. But, you will go bigger. We all do! And then you will really be pleased with the 4.56s. Just saving you some time and money in the long run.
     

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