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Gear swap? #6911437 10/06/17 08:31 PM
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redchevy Offline OP
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Anyone ever done a ring/pinion swap on a late model 4x4 with IFS? Is the front dif vastly different than the rear? I cant seem to find much info on the fronts.

Ram has a relatively new dif and it pretty much seem like people think its taboo to change them out. I'm ok with the 3.55 but they are on the verge of being too high as it is and I'm wanting to put a little bigger tire on when these are shot and don't want to make it any worse.


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Re: Gear swap? [Re: redchevy] #6912086 10/07/17 02:42 PM
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I know youre mechanically inclined, and so am I. But I think I would hire a shop I trusted to do that work. I bet there's adjustments in there that have to be just so.

Ram is now installing 3.42 gears, in 3/4 ton trucks, which is plain silly. 3.73 is the way to go!


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Re: Gear swap? [Re: redchevy] #6912087 10/07/17 02:45 PM
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Also, there's websites that should help you decide on ratio. Input tire size, transmission gear ratios, and it'll spit out RPMs for a given gear ratio. 4.10 might be better for you, but I can't say that with authority. I ran 3.73 and 34" tires, and did just fine from a dead stop heavy loaded, up to 75 mph.


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Re: Gear swap? [Re: redchevy] #6912180 10/07/17 05:02 PM
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Actually not that d8fficult. Did a buddys 16 tacoma 4wd. Switched to 4.56 from 3.73 hardest part was removing front diff. Thay are called clamshell diffs. Will need a press, dial indicator and a special attachment for dial indicator to measure back lash in the clam shell diff.

Re: Gear swap? [Re: J.G.] #6913780 10/09/17 12:57 PM
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redchevy Offline OP
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Originally Posted By: FiremanJG
Also, there's websites that should help you decide on ratio. Input tire size, transmission gear ratios, and it'll spit out RPMs for a given gear ratio. 4.10 might be better for you, but I can't say that with authority. I ran 3.73 and 34" tires, and did just fine from a dead stop heavy loaded, up to 75 mph.


They had 2 factor offerings, 3.55's and 3.92's. The 3.92's were not common on lots so I got 3.55's. I think I'm going to try and go back with 3.92's. I have an acquaintance who has all the tools to do it and has done a few that would probably lend me the tools and for a case of beer and some bbq would probably come help too.

Have heard prices as high as $4,000 from the dealer to 1200/axle from other shops. Finding out what it would run from a shop that is owned by a distant relative, but not holding my breath on that one. I would like to do it for the experience and fun of it.


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Re: Gear swap? [Re: redchevy] #6914057 10/09/17 04:12 PM
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Getting the preload on the pinion is the key. If its not within tolerance, you will shell it out pretty quick. I would at least have this done by a professional.


Re: Gear swap? [Re: redchevy] #6914092 10/09/17 04:37 PM
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jimbob Offline
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Setting pinion preload is a given.

Re: Gear swap? [Re: redchevy] #6914093 10/09/17 04:37 PM
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Setting pinion preload is a given.

Re: Gear swap? [Re: redchevy] #6914113 10/09/17 04:45 PM
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Times like these is when I miss having my beater car, but my brother has an extra I can bum for bit if I need to.

If I was single and had my beater still I would probably be done with it already grin


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Re: Gear swap? [Re: redchevy] #6921108 10/15/17 03:35 PM
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Pm Texas lefty. He may be able to point you in the right direction.


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Re: Gear swap? [Re: redchevy] #6924917 10/18/17 06:03 PM
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I did a Chevy 14 bolt in hs, 3.08 to 4.56 with a Detroit locker. Rented all the good stuff, dial indicator etc. checked it afterwards with the paint making sure the pinion teeth marked evenly on the diff, whole nine yards. It chattered like a mf'er still

Re: Gear swap? [Re: Ramball36] #6925616 10/19/17 12:54 PM
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Originally Posted By: Ramball36
I did a Chevy 14 bolt in hs, 3.08 to 4.56 with a Detroit locker. Rented all the good stuff, dial indicator etc. checked it afterwards with the paint making sure the pinion teeth marked evenly on the diff, whole nine yards. It chattered like a mf'er still


Your spozed to put gear oil in it...


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Re: Gear swap? [Re: redchevy] #6925713 10/19/17 02:02 PM
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All we had was karo syrup

Re: Gear swap? [Re: Ramball36] #6925730 10/19/17 02:17 PM
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Originally Posted By: Ramball36
All we had was karo syrup


Dang the luck.

That's backerds on viscosity.


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Re: Gear swap? [Re: J.G.] #6926487 10/20/17 02:36 AM
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Originally Posted By: FiremanJG
Originally Posted By: Ramball36
I did a Chevy 14 bolt in hs, 3.08 to 4.56 with a Detroit locker. Rented all the good stuff, dial indicator etc. checked it afterwards with the paint making sure the pinion teeth marked evenly on the diff, whole nine yards. It chattered like a mf'er still


Your spozed to put gear oil in it...


That's funny!!!


Originally Posted by Chunky Monkey
Never been to a camping world. I prefer Dick's to be honest.
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