[86TOYO2k17]

Originally Posted by mhiscott

After some more researching, it looks like the following items would be needed to do the swap if you're going with nitro gears:

https://www.justdifferentials.com/To...-390-29-ng.htm

https://www.justdifferentials.com/To...tlc100-ifs.htm

https://www.justdifferentials.com/YO...yfitkit-29.htm

https://www.justdifferentials.com/SKCSTV6-p/skcstv6.htm

Was more than I had expected with all the install parts included, but if you're already cracking the case to install a clutched aftermarket diff, I'm not sure there are any more cost effective solutions. Total is ~ $750 USD

Pretty sure it’s already a 29 spline so don’t need the “fit kit”
You dont need the solid spacer, but it’s recommended uogrsde imo.
And don’t need the seal/bearing kit if your diff is low mileage can reuse. You do need a set of shims but a shop will generally have an assortment available.

M98 rear diff is the oem LSD factory 3.91 FD.
It adds a lot of labor time/expense to swap ring and pinion and crush sleeve and re-shim and set lashing/spacing vs just doing a new LSD. Could even just DIY the LSD swap is giken claims to not mess with spacing/lashing and need re-shimming.