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Old 02-19-2013, 04:32 PM
cawish33 cawish33 is offline
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Default 2011 ZF axles vs 9.25 chrysler 4.56:1 ratio

this is to clear this out between the two axle in our dodge ram 1500 , if you think changing ratio to your truck , carefully check the rear end and the front diff

ok as the title says all the 2011 + rear end diff as the new zf axle internal, well it is a 9.25 chrysler with a zf interrior. i compare the two carrier bearing etc.. it's all the same except for the bolt in ring gear the zf is a lot bigger than the older 9.25, the axle spline are the same, so the ZF is a lot heavy duty interior for the ring gear bigger bolt,
so if you wanna go 4.56 you have 2 choice, the first is to swap a 9.25 chrysler carrier and you can put every ratio you want as before , and 2, drill out the new ring gear and tap new thread to bolt straight to new zf interior.

as for the front all the 2011 and older are the lucky one
the diif in the front is a 8 inch chrysler , same as the older 2002 to 2011 ram 1500 except for the 2002 - 2005 as the manual shift for 4x4 but they all the same diff, so for the 4.56 on the front end is just a swap gear. on the 2012 + it is the same as 2011 except the ring gear is solder to the carrier and it is a new internal zf too so the only thing you can do is to swap the entire front diff for a 2006-2011 ifs 8 inch chrysler
i just ordered my front and rear gear , i will post picture of the install and the 2 carrier difference
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