| PM | Quote | Reply | Full Topic |
Joined: Fri Nov 10th, 2017
Posts: 1540
Status:
Offline
Reputation: 
Reputation Points: $user_rep
The last grouping is the plant it was manufactured at. The 75 means it is a 7.5" pumpkin. A 4L10 is a limited slip 410 ratio. If there is no L and it is just a 410 then it is a open diff.
Sounds like you need to service the rear end to have LS.
____________________
Tony
NE ATL
'04 XLT regular cab 3.slo stepside
Semi retirement