Howdy
I have done bell housing bolts with a LONG(like 3 feet) extension and impact wrench up over the top from behind. This is easier with two people, one to guide the socket and another underneath to run the wrench.
I have also done it from the top by the firewall. Remove the fuel manager, remove the transmission tail support bolts and lift the tail end just enough to create a bigger gap between the firewall. If you go this route you WILL have bloody knuckles!
If you have a lift in your shop it's much easier.
I have also lifted the cab off of trucks to remove/work on the engine, however that is only possible with a lift.
Not sure why the front drive shaft is giving you problems...? Remove it.
Hope this helps!
1996 Chvy 3500 CCDWLB 6.5 Heathed, NO vac, marine injctrs, ARB bumper, BIG pipe, 3" lift, bright lights, bypass oil system.
1986 Chvy 6.2 M1009 blazer RAM AIR, Headers, Custom interior
2001 Chinook RV, V10 gas
1974 John Deere 1530 diesel tractor
1993 John Deere 455 Diesel lawn mower
1967 GTO, 1989 Honda Transalp
2009 VW Jetta TDI, flashed and piped, 6speed, fun car!
1998 6.5 suburban, stock, daughter's
1993 6.5 3500 CCSWLB GM8, Heathed, big exhaust, gauges, Son's
1984 6.2 ATS turbo 3500, SCDWLB - Son's
3 kids, 1 wife, 1 dog
Gunsmith, Tactics Instructor, Fabricator USMC 87-93 Semper Fi!