Anyone have 4.30 gears and 35" tires?

Discussion in 'Lifted Suspension & Offroad' started by 4x4 350, Mar 19, 2017 at 3:06 PM.

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  1. 4x4 350

    4x4 350 GMFS Member

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    Hey Guys, Im looking into re-gearing my OBS Tahoe over the next few months. Im looking for real world opinions on running 4.30 gears with 35" tires. Ive run 35"s on my stock 3.73 gears for about 6 years but the truck is no longer my daily driver and im looking to do some upgrades. I am going to be installing a Detroit Truetrac in the rear axle so I figured this would be a good time to think about re-gearing. I dont plan on ever going larger then 35"s on my truck. Any places to go four wheeling are at least an hour or more of highway driving so I dont want the truck to be screaming on the highway. Thanks for your help guys!
     
  2. Matt_

    Matt_ Where's the van?!?!?!

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    I ran 4.88s with 35s on my gmt800 silverado and it was my commuter which saw a lot of highway. It also had 4.10s stock. With 4.10s my truck had trouble holding OD with the slightest incline (used to drive across NJ everyday). I don't think 4.30s would have been a big enough improvement, but know the 4.88s were spot on and the RPMs weren't anywhere near "screaming".

    Since stock trucks come with 4.10s, I think 33s warrant 4.30s and 35s get 4.88s to keep those vehicles operating in their prime towing range.
     
  3. 4x4 350

    4x4 350 GMFS Member

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    Thanks Matt,
    It is coming down to 4.30s or 4.56s for sure. Being from NJ any time I go on a trip I have at minimum an hour highway driving. At about 65-70 im just at 2000 rpms now. Honestly, Ive never had to re-gear a truck before so I am just trying to make sure I dont regret it. What you are describing with the 4.10s is how I feel with my 3.73s now. The truck can turn them around town ok, but off road I feel it could use some help. I saw that 4.30s are relatively new,so I haven't seen too many people with them yet.
     
    Last edited: Mar 19, 2017 at 4:23 PM
  4. Matt_

    Matt_ Where's the van?!?!?!

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    If you're in between, can't go wrong with 4.56s. They're tried and true and will be a solid improvement. Knowing how the 4.10s felt in my truck, I think you may be dissapointed with 4.30s, or at least 'underwhelmed'
     
  5. Irishboy02

    Irishboy02 GMFS Member

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    I'm also from Jersey so I feel the pain. I'm on 373 with my NBS on 36" toyo mt. Go 456 to stay right where you need to be. 488 May be too tall but 456 will be perfect

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  6. 4x4 350

    4x4 350 GMFS Member

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    Thanks for the feedback. I was kinda hoping someone had that exact combo. I wouldn't hesitate on the 4.56s if I planned on going bigger but im really happy with the truck as it is. Has anyone run Motive gears? I see that they are one of the only companies who makes 4.30 gears for our trucks. I had heard that they could whine once installed. Thanks for the help guys, just trying to find out as much as I can before I order anything
     
  7. Phildirt

    Phildirt n. fil-dert.

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    Almost everyone has said 4.30s are not what you need why are you hung up on that gear ratio? If you were planning 33s I'd still say 4.56 if you are going through the trouble of a gear swap. 35s it's an easy call.
     
  8. ogg

    ogg GMFS Member

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    I'd go 4.56s for sure. I wish I had 4.10s instead of 3.42s in my NNBS on 32.5" tires, I can't imagine rolling around on 3.73s with 35s behind a 5.7l.
     
  9. This right here.

    Go with 4.56 and call it a day.

    We have never used a 4.30 in any of our trucks running a 35" tire.

    Either a 4.56 or 4.88 when running a 37" and up
     
  10. Loudandproud

    Loudandproud GMFS Member

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    I'm running 4.88 with 33s as my daily. It's fun!
     
  11. 4x4 350

    4x4 350 GMFS Member

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    Thanks for the feedback guys! Didn't mean to push the 4:30 issue, just concerned about the highway RPMs. 4:56 looks like it should be pretty spot on for my use. Would someone with 4.56s, 35s and the 4l60e trans be able to tell me the approximate RPMs at 65-75? I'm just curious. Can't wait to get them installed with the true trac!
     
  12. sschup1130

    sschup1130 GMFS Supporting Member

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    Definitely do 4.56's with a 4-speed. There was a member on here that installed the RC lifts who was running 4.30's, but that was on a NNBS with the 6-speed. Can't recall the name, and I haven't seen him on hear for a year or so.
     
  13. Irishboy02

    Irishboy02 GMFS Member

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    4.56 at 70mph is approx 2150rpm on the 4l60e

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  14. HackMcMASTER

    HackMcMASTER the internet BADASS

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    Call Strange (1.847.663.1701) and order these
    RS01885456 unless you can get them to sell you a RS01885456US
    D3598G
    Should last you forever
     
  15. RedRiverado

    RedRiverado New Member

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    I have 35s, and I been rolling with stock 342s (it's horrible), having 456 and true trac installed tomorrow, I have the 6l80, is it gonna have a lot more power over stock or will it be closer to stock power again?
     
  16. Phildirt

    Phildirt n. fil-dert.

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    Massive power gains. Wheelies and what not.
     
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  17. RedRiverado

    RedRiverado New Member

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    Can't wait for my stock truck with 10" of lift to do wheelies, gonna be some witchcraft shit going on


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