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3.08 to 4.56 Gear swap?

Neutril

By Neutril
in Engines & Drivetrain

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LongrangeLauber Senior Enthusiast

LongrangeLauber

Posted
Posted

Well, thing is, they ordered all the parts thru aftermarket vendors. And the vendor said not to do it because it's not worth it and it won't even last as long as my 3.08s. Which only lasted 12k miles. Lol. They also said if they did it they couldn't put a warranty on it, actually nobody would because of the housing. They can put a warranty on 3.73s and its OEM.

 

 

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I don't see how the housing will decrease the life of the gears. Maybe not enough fluid getting to the gears to cool them properly?

 

 

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Neutril Enthusiast

Neutril

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To match the angle of the drive shaft, they apparently had to angle the axle up to match the driveshaft this the gear oil isn't lubricating properly. And also they'd have to dremel the housing to fit 4.56s. So that could also do harm later down the road.

 

 

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Neutril Enthusiast

Neutril

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AAM is the manufacture of these axles and they have an aftermarket 4.10 ratio.

 

RT

So I looked into AAM. And I have to say, it answered all my questions in a matter of minutes. I have the 12 bolt 9.5" rear end in my '14 Z71 Double cab, and the lowest gears I can get are 4.10s. Anything past 4.10s and I would have to have to get the 14 bolt rear end. So 4.56s are out of the question, but 4.10s should do me justice for now. Thanks again guys.

 

 

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Front Runner Enthusiast

Front Runner

Posted
Posted

To match the angle of the drive shaft, they apparently had to angle the axle up to match the driveshaft this the gear oil isn't lubricating properly. And also they'd have to dremel the housing to fit 4.56s. So that could also do harm later down the road.

 

 

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Not saying they aren't telling you the truth but if that's the case, but why aren't other 6 inch lifted trucks having a problem with diff gears not being lubed properly and failing because of driveshaft/diff angles? I know some lift makers had that issue when they first released their 6 inch lift for 2014+ trucks but they have since corrected the problem. Since, I haven't heard of any issues.....

 

Am I off base?

ccdies Enthusiast

ccdies

Posted
Posted

im going to be ordering 4.88 from Rons machine shop, check them out, they have the complete rear kit for $1095, I haven't looked up the front yet

  • 2 weeks later...
ccdies Enthusiast

ccdies

Posted
Posted

I like how mine sits as well, but 35s with a 3.08 literally means my transmission doesn't know it has a 6th gear and I barely see 5th. Lol

 

 

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i know what you mean, i ordered every thing for the front and rear and itll be dropped off on the 18th for install, cant wait, i went with the 4.56

Neutril Enthusiast

Neutril

Posted
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i know what you mean, i ordered every thing for the front and rear and itll be dropped off on the 18th for install, cant wait, i went with the 4.56

What did it cost you?

 

 

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ccdies Enthusiast

ccdies

Posted
Posted

What did it cost you?

 

 

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Parts alone front and rear tru-track, $1597.80 plus $50 for shipping, labor is another $900

ccdies Enthusiast

ccdies

Posted
Posted

Front Diff

4.56 Gears $213.60

Carrier Case $137.05

Master kit $122.00

carrier locks $28.78

 

 

Rear Diff

4.56 Gears $198.00

Master kit $195.93

Pininon yoke $83.68

Pinion seal $13.58

Diff cover spacer $60.00

True track $545.18 or Dura Grip $490.45

Parts total for dura grip $1543.07

Parts total for Tru track $1597.80

Neutril Enthusiast

Neutril

Posted
  • Author
Posted

Front Diff

4.56 Gears $213.60

Carrier Case $137.05

Master kit $28.78

 

Rear Diff

4.56 Gears $198.00

Master kit $195.93

Pininon yoke $83.68

Pinion seal $13.58

Diff cover spacer $60.00

True track $545.18 or Dura Grip $490.45

Parts total for dura grip $1543.07

Parts total for Tru track $1597.80

I went with 4.10 gears since I have 3.08s right now. I'm having Da Drop Shop here in midland Texas install it all. They priced me $2k for parts and labor.

 

What ratio do you have right now?

 

 

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ccdies Enthusiast

ccdies

Posted
Posted

I went with 4.10 gears since I have 3.08s right now. I'm having Da Drop Shop here in midland Texas install it all. They priced me $2k for parts and labor.

 

What ratio do you have right now?

 

 

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i have 3.08, and for 2K, thats a better deal then what i found

Neutril Enthusiast

Neutril

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So how are you going to 4.56s? I was told anything over 4.10s on the 12 bolt 9.5" would need dremeling..

 

 

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ccdies Enthusiast

ccdies

Posted
Posted

So how are you going to 4.56s? I was told anything over 4.10s on the 12 bolt 9.5" would need dremeling..

 

 

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i dont know, i dont think they dremel any thing, they replace the whole carrier and add a spacer that goes inbetween your diif and the cover, because the new carrier is bigger then stock, its not just a ring and pinion repacement, its the whole carreier

Neutril Enthusiast

Neutril

Posted
  • Author
Posted

Hmm. Well, I'll stick with the 4.10s for now. I have my eyes on 2012 cummins I may trade for. If not then I'll go up to 37s and 4.10s shouldn't struggle too much with that.. I hope.

 

 

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