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diesel, best ratio with 35's?

Discussion in '1982-Present GM Diesel' started by muddybuddy, Nov 10, 2006.

  1. muddybuddy

    muddybuddy 3/4 ton status

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    i know for gasser's 4.56s are perfect for 35's. ive got an '86 6.2 with 700r4 3.08's and 35's. after driving at higher speeds, that ratio sucks. instead of regearing my 10b's, im going to swap in 3/4ton stuff since this is going tobe a work horse (i dont have a trailer, its gona be for loads to dump, mulch, collecting car parts, you know the drill). im thinking 3.73s or 4.10s right? those are stock ratios so i could snatch a set up pretty cheap. what do you think? i dont really plan to go bigger than the current 35's.
     
  2. imiceman44

    imiceman44 1 ton status

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    I f you want the best economy and willing to baby the tranny when towing, go fo rthe 3.73
    If you want to play it safe go 4.10
    Both are stock gearings for the 3/4 ton so it would be easy and cheap.
    :D
     
  3. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    35's, 4.10's and the 700R-4 is perfect for a 6.2. Better power, and it puts the cruise rpm in the perfect zone for best fuel economy...1800 rpm at 65 mph.

    Rene
     
  4. william_7900

    william_7900 Registered Member

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    Is there enough torque at 1800 RPM's to climb small hills etc.. (typical highway driving) without having to downshift?
     
  5. diaric

    diaric Registered Member

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    x2 on 4.10's. 1800 is where a 6.2 wants to cruise for milage and 3rd is at the rpm for towing especially if TC locks up in 3rd
     
  6. Russell

    Russell LB7 Tahoe Status Premium Member GMOTM Winner

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    I'm lovin' my 4.56s gives the 6.2L a lot more guts, though it does start to cut into fuel economy.
     
  7. AJMBLAZER

    AJMBLAZER Better to be lucky than good. Premium Member

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    Wow, this thread was pulled back from the dead...zombie thread?

    I like my 4.56's with a TH400 and 38" tires. OD would be good though. Drives nice now but OD would make anything over 55-60 friendlier.
     
  8. william_7900

    william_7900 Registered Member

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    As I mentioned on another thread - I'm running 4.10's and 35's with an NV4500 (has overdrive) and at 65 mph I'm at about 2500 RPM's. My hope is that I can lower the RPM's and have more torque by swapping in a 6.5 diesel.

    Thoughts?

    William
     
  9. cegusman

    cegusman 3/4 ton status

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    I like my 4.88, 38.5's with a sm465 Highway rpm sucks but for wheeling it is perfect.
     
  10. AJMBLAZER

    AJMBLAZER Better to be lucky than good. Premium Member

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    You should be pretty good with the 35's and the NV4500 then. Nice around town torque but with the OD you won't be spinning it too fast. Not sure on the numbers though...these guys could figure it out. I don't even have a tach.
     
  11. Mikey von

    Mikey von 1/2 ton status

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    william, in 5th gear, with 4.10's and 35" tires you should be spinning at 1919 rpms. see here http://www.grimmjeeper.com/gears.html.

    I run 35's and 4.10s with a th400. I always feel I could use more on the highway.

    I want to run 35's, 4.88, and the NV4500.
     
  12. william_7900

    william_7900 Registered Member

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    Mikey von,

    My hope is to sell the NV4500 and put in a 700r4 when i swap in the 6.5. I bought this tranny new and i guess have 5k - 10k miles on it.

    Not sure what it is worth or if you want to buy it but thought i would mention it.

    William
     
  13. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Why would you do that? The 700R-4 is a piece of crap compared to the NV4500, and the OD ratios are almost identical.

    Rene
     
  14. AJMBLAZER

    AJMBLAZER Better to be lucky than good. Premium Member

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    I've considered it...for ease of installation and the wife might actually drive it...but dunno...rather have a stick...
     
  15. Jambi

    Jambi 1/2 ton status

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    The 700r4 can be built but it'll never be a NV4500 or a TH400 for reliability.

    If you are interested in the 700r4 you may want to check out this book over at the diesel page. It's got a section on a "performance" 700r4.

    If you are going to keep that 6.2 around you may want to check out there other books as well, good stuff.
     
  16. kennyw

    kennyw N9PHW Premium Member

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    But the money you will spend to "build" a 700R4 will equal if not exceed that of a NV4500 and still not last 35% the life of a NV4500.
     
  17. Jambi

    Jambi 1/2 ton status

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    Exactly :wink1:
     
  18. william_7900

    william_7900 Registered Member

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    Well, maybe you guys have convinced me to keep the NV... to be honest, i like an automatic but i may wait and see how the NV feels behind a 6.5 before making a decision.

    Can you guys believe those sorry Cowboys?

    William
     
  19. Jambi

    Jambi 1/2 ton status

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    Yes :haha:

    What really grinds my gears is how badly the Broncos got slapped around by the Chargers :doah:, I mean come on! The Chargers! :mad:
     

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