haha man you have an OPEN front diff...only a pinion and some gears that left front wont spin..
BUT with no weight on the bastard it should spin backwards..id say grab the front CV and just pul on er..does it move? rattle? anything? and id she ahs lots of play id be rippen the diff out and takin the cover off..might have something wrong in the pionion or mini axle
ID ALSO be careful doing it but try and spin it while the rest are..it if grabs and goes backwards well it should be ok..
Spin the good one forwards when locked in 4x4 and the engine off..then run over to the other side see if its going backwards
89 S-10 Blazer- SOLD
00 Honda Civic- too many mods to list..mm turbo..
01 Acura EL 1.7- SOLD
02 Edge 3.0 - SOLD
03 FX4 Level II - SOLD
03 PSD lariat 7.3L- Written off ( RIP 03/15/09 )
03 PSD lariat 7.3L- bought 04/06/09