I've got a 4.10 fine spline 3rd member. need to finish setting it up all new bearings. gears used from a 80 series currently on a semi floating 40 carrier...
I just pulled a set of 4.30 8” 100series gears. I have an 80 high pinion carrier I can set them up in. Not the lowest cost options but possible. The 80 being 4.10 most switch to 4.88 the effort for 4.30 wouldn’t be worth it.
New bearings carrier and set up would be $650 FYI.
As we discussed. There is not a factory front 80 series with 4.30 gears. There are high pinion 4.30 gear sets from a 100 series that can be set up in an 80 series high pinion carrier. Or new options. No oem bolt in options without gear set up.