I bought a itr lsd diff 4.4 final drive and took it to a shop for them to swap out my stock non lsd stock gsr diff to my itr lsd 4.4 diff final drive I recent pick up....well the shop say that all my gear inside my trans is a b16 gear n that my final drive won't fit on to my itr lsd diff? ? So my question is dose b16 final drive bolt up to itr lsd diff or not??cuz I know my trans is a gsr trans n there saying it not that its is a b16 gear inside?? But now I got a call back from the shop and they say that got a full gsr gear that they will swap it out for me..but they'll charge for it???

dose itr lsd diff final drive bolt on b16 final drive or not?
my trans is a gsr trans and the shop says it not a gsr trans that it is a b16 trans???

 

Gsr and itr diffs are interchangable ls and b16 diffs are interchangeable

 

B16 ring gear will not fit a B18C diff. I'd suggest heading out to the shop and looking at the trans yourself (count the ratios).