Could I squeeze a Group 31 battery in the stock location? Probably have to modify the batt tray. I believe our stock batts are group 34.
34 = 10 1/4 x 6 13/16 x 7 7/8
31 = 13 x 6 13/16 x 9 7/16
The extra 2 3/4 in. length probably wouldn't be too much of a problem, but the extra 1.5" height?