I am getting 4.56 gears, putting into 1st gen 1983, running on 33x12.5, I know the gears will fit, getting two rears, swapping the whole axle assembly on the rear and swapping out the front gears. Are 4.56's the same bolt size and pattern for the driveshafts, if not what can I do to modify or make it work. Any info or leads will help, still getting used to the search tool

 

4.56 is a waste of time i got some off craiglist spent months setting them up by myself and now i wish i would have jumped up to 4.88.my 83 seems to have better gearing but it wasnt a noticable difference from the 4.10s.i paid 100 bucks for used grears and 200 for new bearing kits and 20 for a dial indacator from the infamous harbor freight and i feel like i wasted my money on 4.56 gears.and i'm only running 30 inch tires.while you have 3rds to work with go 4.88
end rant!!!!

 

i'm no expert but i think all sfa bolt patterns are the same ifs is different like after 85

 

All SFAs (besides TRD lockers) are the same. also, I agree with blueyota, youll probably like the 4.88s better, but hey, 4.56s are better than 4.10 and youll deff know the difference.

 

well thank you for all the info. I am going to go with the 4.56's and try to downsize from 33's to 31's. I figure that will be a good match. I only use the truck for huntin and just want the truck to preform well in the bush.