Wifey gave the nod for 4.56s!

Discussion in 'General Chevy & GM Tech Questions' started by kinson33, Apr 19, 2013.

  1. kinson33

    kinson33 New Member

    The lady and I made an agreement when we got married, anything over $100 has to be discussed. Obviously the rate will be negotiated as we move up but it's probably saved us some $$.

    ANYHOW, pretty stoked. Found a set with master install kit, front and rear axle for $500. Hopefully update y'all soon.

    One question. Will driving with the ABS light on until I get it tuned for the new gears cause any damage?
  2. TRPLXL2

    TRPLXL2 New Member

    First off WOW on the price, that is crazy suspiciously cheap lol!! I can't even get a Richmond ring and pinion for under $400.

    As for the ABS I can't really say for sure, but I just upgraded from 3.42 up to 4.10 and the only thing I noticed is the transmission shifts a little different, but I also have not been retuned as of yet.


  3. kinson33

    kinson33 New Member

    Yeah it's all name brand stuff. USA Standard gears and Koyo bearings with the master kit. Seller on eBay has over 10k positive reviews so it seems pretty legit.

    I heard that anything over 4.10 will set off the abs light but I haven't found a definitive answer as to what harm that can do to the truck, if any.
  4. SurrealOne

    SurrealOne Former Member

    > 4.10 will, indeed, trigger the idiot lights.

    I don't know about driving with them on, as I retuned mine in the parking lot the day I picked it up when the regear was complete. :)
  5. kinson33

    kinson33 New Member

    Yeah, I wanted to spread the cost some since a decent tune will be about $400, gears $500, then probably a few hundred for the labor on the front axle (don't think I'm up for that install).

    Not bad all in all though, just have to break it up so she doesnt flip out $$:gasp:
  6. kinson33

    kinson33 New Member

    just to add on, I've looked this guy up on other forums. Has a great reputation on a few truck sites. Ron's machining service
  7. JimmyA

    JimmyA Member

    How do you like the upgrade so far? What improvements have you experienced, rear torque (pulling power), MPG, less downshifting while slight uphill grades? I am near a gear change myself and would like to know, your thoughts. Thanks for any reply....
  8. kinson33

    kinson33 New Member

    Ordering them tonight, I take a lot of time before spending a few hundred (thrifty some say). I will definitely update as soon as they are in. I have been checking multiple forums for opinions on the 33" tire with 4.56 combo. You can order 4.10s factory with the 31" tire which is pretty close in effective gear ratio, so I feel comfortable with the setup.

    Also:

    I have called a few shops around town, all have said I won't do any damage to the vehicle with the idiot light on. Just an off speedo and lose the ABS system.

    One of the mechanics I spoke with said when he installed his lift that the instructions recommended disabling the ABS... anyone heard of that or is that just an old school mechanic?
    Last edited: Apr 23, 2013
  9. dsfloyd

    dsfloyd New Member

    Superlift sells both a speedo calibrator (part #33003) and an ABS calibrator (part #3400). I have the speedometer calibrator and it worked perfect (allows 2 settings by a switch), it is a hardwired unit. I do not have the ABS recalibrator as I do not have 4.56 in my truck currently (will probably go to it eventually since the truck is no longer a dd)
  10. kinson33

    kinson33 New Member

    Got your message, thanks David.

    I'll look into that, just got the gears in yesterday! Now its just a matter of finding a day off to get them installed... lame, I know.

    I've made a few connections through my work though and a mechanic shop down the street from me has a few guys that build their own rock crawlers, sound pretty knowledgable. Told me he knows how to calibrate the computer for the new gears and aftermarket tires. I'll see what he is asking for to do this.
  11. Marcus A.

    Marcus A. New Member

    4.56 gears and 33" tires is very close to 4.10 and 245/75R16(30.5"). If you put 32" tires its roughly a 4.23 gear. I've looked at putting 4.56s in my '03 3/4 ton burb. Let us know what it cost to have installed.
  12. kinson33

    kinson33 New Member

    I have a shop north of Denver that will do it for $250 on solid axles, and around $350 for the front. Sorry fell of the radar there, new job. Trying to get the gears done tomorrow or wednesday!
  13. pmackiniv

    pmackiniv New Member

    what gear size would you suggest for a 1996 GMC Yukon with a 6" lift on 35's?
  14. stchman

    stchman New Member

    Did you re-program the ECU to tell it about the new gears in your differential(s)? If no, you need to.

    - - - Updated - - -

    I would go with 4:10 gears.

    - - - Updated - - -

    IMO just doing what you talk about is not good enough. Hypertech, Diablo, etc. allow the user to program the ECU with tire height and axle gears. This will make sure the ECU shifts the transmission correctly.
  15. pmackiniv

    pmackiniv New Member

    What would be the best search to put into google to find 4:10 gears, and how much does something like that cost to get done?
  16. kinson33

    kinson33 New Member

    Most definitely.





    Respect your opinion, but disagree from prior experience.

    4.10's are a stock option with 31" tires, with 35's I would definitely do 4.56 to keep your engine at the normal operating range. You will notice bogging down especially when trying to pass people on the highway. Then to make up for it the truck will kick down a gear putting the RPMs over 3000.

    Make it easy on your engine and trans and do 4.56's with 35's. Probably get better fuel mileage too, not that we can do much for these trucks other than a 4bt swap ;)

    I know plenty of people happy with 4.56's even with 33's (setup I'm doing, still waiting on install...)

    - - - Updated - - -



    I picked up a used SuperChips (#2715) for cheap and it allows me to choose the gear ratio, tire size, and a few other basic power options. Not as good as some of the tuners you can find here, I just got lucky and happened to come across a used one that wasn't vin locked.

    - - - Updated - - -

    So far my cheapest quote for labor (from a reputable shop) is $1100. I'm waiting to hear from a guy who rebuilds axles for one my bodyshop clients. The garage owner races cars as well works on all sorts of chevys, unfortunately very booked up though. As soon as I can get a quote from him I'll know which way I'm going, only reason I'm holding out is b/c my bodyshop client told me the garage he uses might be able to do it for around $600... we'll see.
  17. stchman

    stchman New Member

    My 2008 Silverado had 3.73 gears and 275/55-20 tires (they are 32" tires) and had no bogging whatsoever. The acceleration was very good. So for 33" tires, 4.10 gears will give you quite a bit more torque. I would only put 4.56 gears if I had 35" or taller.

    Just my opinion.
  18. dsfloyd

    dsfloyd New Member

    I don't disagree with this. A programmer is still on my list. But at the time having the speedo correct was more important (when adding up costs), and with the 4.10s haven't noticed any shifting issues.
  19. kinson33

    kinson33 New Member

    We're on the same page.

    I've got 33's now. Not fearing the 4.56's with the 33's, but my next set of tires will be 315's (34.8") or 35's. Whatever I can find a decent deal on. If I get a company car might go with a body lift and try to squeeze 37's but I would be back at square one with that big of a tire and the gearing haha!
  20. kinson33

    kinson33 New Member

    Gears are in!

    Couldn't be happier with the setup so far. Only 100 miles on them, still breaking it in. Won't romp on it until I put some more miles on then get the fluids changed.

    Already love the difference on the highway, doesn't downshift at every incline anymore. With my 35's and the 4.56's I'm at roughly 2200 RPM at 70mph, finally have my passing power back.

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