I have 4.56 with a eaton posi
I did the upgrade after my stock g80 blew out
they were on 295/35/24 for a couple months and did alright with gas mileage
then upgraded to 305/30/26 and it got better
it is such a big difference from the stock 3.73 trying to spin that big of a tire from a dead stop
do 4.56 I promise you won't regret it
just make sure to get a blackbear tune or equivalent so you can change your speedometer.. it will be off 15 mph
I did the upgrade after my stock g80 blew out
they were on 295/35/24 for a couple months and did alright with gas mileage
then upgraded to 305/30/26 and it got better
it is such a big difference from the stock 3.73 trying to spin that big of a tire from a dead stop
do 4.56 I promise you won't regret it
just make sure to get a blackbear tune or equivalent so you can change your speedometer.. it will be off 15 mph