I measured both the L-52 with the t-case to the back flange is 34 1/2" The G54 Transmission is 38 1/2" long measured the same way.
I did this swap a couple months back.
http://board.marlincrawler.com/index.php?topic=14492.0 I used a bud built low profile crossmember and moved it back to the back mount bolts and used 2 u bolts over the frame to hold up the crossmember.
You gotta lengthen your front driveshaft and shorten the rear driveshaft.
I used a IFS front drive shaft since they are longer I modifyed it to move beyond 25 deg of flex.
shortened rear driveshaft
