1995 Gmc Jimmy SLT 4wd

What tool can be used with success to tighten / loosen the Trans Fluid Cooler Line connections at the transmission end.
This is a very tight spot - high up on the transmission underbelly on right side of transmission.
12 mm or 13 mm Flare Nut, I believe.
I believe one time when I had the trans separate from the engine via the bellhousing bolts removed, that lowering or raising the trans byway of a jack/plywood under trans pan - made access to these two upper cooler line flare nuts much easier.
However, their should be another tool/method when engine/trans are completely mated ???
suggestions . . . .

 

Any suggestions ...... ?

 

This is what I use... a 3/8" drive 1/2 or 13mm (whichever is tighter) crows-foot from snap-on(flank-drive) with a 1" extension, impact swivel and a long swivel extension(length depends on situation) attached to my 3/8" swivel headed Ratchet.
Tranzman

 

Tranzman

wow ! That is great ! Thank you