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**LockDoc** · 03-09-2017, 02:00 PM

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Unfortunately the M21 is a standard car 4 speed with no OD so 4.10's would be a bit low. The 3.73 would work great for that application and that is what I would recommend.....

Just my 2¢ worth.

LockDoc

03-09-2017, 02:00 PM	#6
LockDoc The Older Generation Join Date: Aug 2006 Location: Montezuma, Iowa Posts: 25,558	Re: Ls swapped rear end question - Unfortunately the M21 is a standard car 4 speed with no OD so 4.10's would be a bit low. The 3.73 would work great for that application and that is what I would recommend..... Just my 2¢ worth. LockDoc __________________ Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 -