4.56 Gears

Discussion in 'Towing' started by Wheeler, Jan 2, 2020.

  1. Supercharged111

    Supercharged111 I'm Awesome

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    My 4.10 diffs in my 98 came from a TBI truck.
     
  2. b454rat

    b454rat I'm Awesome

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    Every 2500 6 lug I run across I look for 4.10s. Never found a set. There is a guy trying to sell a 95 rot box, he took a pic of the RPO codes and says GT5, but wont' sell the axles. I really only want the front, since regearing the rear is $125 for a new set.
     
  3. L31MaxExpress

    L31MaxExpress I'm Awesome

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    Look in the 4.3 2500 trucks.
     
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  4. Wheeler

    Wheeler Newbie

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    After you posted this, you had me researching... man that really seems like they put out some killer power.. I read a few articles about the 5.3 stock with just adding a procharger for towing & the hp/tq #s were very impressive...

    I'll be inquiring about this with the tuning shop I use...
     
  5. Madscientist

    Madscientist I'm Awesome

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    I have a 5.3 in my truck with the BTR stage 2 truck cam and some bolt ons. It runs extremely well with the 4.56. I do a fair amount of towing and it tows 6500 lbs in OD. I also have a supercharger off of the sts-v 4.4 northstar motor. im doing a fair amount of work to make an intake manifold for it but im not too far away from it.
     
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  6. b454rat

    b454rat I'm Awesome

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    I looked at those for the NV4500s and still didn't find any. Most had 3.73s, some even had 3.42s. Not a big deal, if DMV doesn't open soon so I can put it on the road, then gonna SAS it. Have 90% of the parts.
     
  7. cngodfather

    cngodfather I'm Awesome

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    I put 4.56 gears with 35" tires and I love it.
     
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  8. stutaeng

    stutaeng I'm Awesome

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    C/K 2500 came with 4.3/4.10? What years were these optioned? I thought C/K 1500s only came with up 3.73? Maybe the GMT-400 SS came with 4.10?

    OP, I thought the 383 with 4.56 would have plenty of power. At the end of the day, 7,000 lbs is not a ginormous load. You've already spent a lot of money on upgrades. I would not do a supercharger because you are running a 4L60e. Even though it's rebuilt, they are not known for taking a lot of power, unfortunately.

    Maybe a 7.4/4L80e would have enough power for you? Are the 8.1/Allison GMT-900 trucks available in your area? The 2500/3500 trucks are heavier and could pull a heavier load, just don't think they will be much faster, unless towing to the max. Maybe I'm wrong?
     
    Last edited: Jun 1, 2020
  9. 98chevy2500SS

    98chevy2500SS Specializes in Accessories 101

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    You are correct, 91-93 454SS's came with 4.10's, I believe the 90 454SS was the only year to have 3.73's.
     
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  10. Wheeler

    Wheeler Newbie

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    You are correct.. I've spent way more $$ than some will believe... I thought the 383 with 4.56 gears would be a beast.. (295/70/17 Tires too! 33.26") but it's just not what I expected. It does what I want but for the $ spent & how it pulls 7k up small grades in 3rd unlocking just surprised me.. so I want more.. I did keep the stock heads which maybe a hindrance.. I'm not sure. I don't want to go fast, especially now that I have the low gears.. Yes I know the 4L60e is a weak link. Builder told me not to exceed 500hp as that's all it will hold "as per his build"... I only put down 250whp & 322ft/lbs tq. I would like to see some more.. Larger heads & long tubes maybe? Positive Displacement Blower will do trick... I dunno... maybe I should just get a diesel....
     

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