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Yukon has 4.56's for the front ZF diffs now.I'd unbolt the front driveshaft if you need to run it with mis-matching ratio's. You'll have to unbolt it to do the diff or gear swap anyways.
www.yukongear.com
Unless you're hard core off roading there's nothing wrong with your ZF front diff.The older AAM diff has a stronger case,but you really have to be beating on the truck to justify the cost of swapping the front diff. You need the older style motor mount / driveshaft / diff , and diff brackets etc to swap the diffs,plus still buy the gears,so it's not a cheap swap even if you find everything used.
By now you must of seen Rick Roods video,it's been out for a few years now,the ZF shafts are totally servicable.
rickroodstransmission.com
www.youtube.com
You really have some funny ideas at times don't you,lol. Why fluck around with all the parts chasing to hunt up everything needed to swap to the older AAM diff,when all he has to do is swap gears in his ZF diff.Little tidbit for you,you don't have to remove the diff to do the output shaft on the passenger side,it can be done with the diff still bolted in place,but if you're swapping gears,it's probably easier to pull the diff for the gear swap,and then if his pass side shaft is bad,that's the time to do the output shaft.
. so they both suck actually... lol...If you can't pop a CV , undo 4 bolts and unplug an actuator in chassis,you're not as good a wrench twister as i thought you were,lol.You seem to have forgotten that I did the swap in my driveway by myself. Not in my Gucci shop. So I know how simple an easy this job is
Who the **** would do that job in the vehicle, I just looked on YT for a video and cant find one so Please show me, I wanna laugh.
Im just the type of guy who looks at maintenance and try's to figure out cheaper and best option. In this case the cheaper option is also the better option, thats why I did the Gen 3 diff. 500$ output shaft arent my cup of tea.
Either way we both have front diff that have no lockers
If it's a pavement princess,that's more street and track based then off road based,why don't you remove the front diff / front driveshaft and CV axles. You lose roughly 120 lbs off the front end,with 40 lbs of that being rotating axle weight.
If you have 3.55's,i'm guessing you have the RFE 6 speed,have you ever considered doing an 8 speed swap.The 8 speed is good for at least a 1/2 sec and with it's stump pulling 4.71:1 first gear,you won't really need 4.56's.
