My undersized group 58 battery started getting weak at less than two years old. I wanted a larger AGM battery, so I decided to get this group 78 AGM from sam's club for $129 http://www.samsclub.com/sams/duracel....ip?navAction=
To install it I cut the forward lip off my battery tray with a cut off disk in a 4 1/2" angle grinder. I gave the cut and rest of the battery tray a good coat of cold galvanizing paint to prevent rust. I had to put a 1/2"x1"x4" piece of rubber between the hold down and battery to make it tighten securely. It only hangs over the front of the battery tray by about 1/2". Spins easy now.

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2003 Ranger XL 2WD AT with a 4.0 from a 2010 Mustang (61,000 mi) new 03 ranger injectors
Rebuilt the 8.8 with Richmond 4.10 gears, Timkin bearings and rebuilt the Trac-lok, 245/70/16 Michelin-X Radial LT2
18 mpg, all city driving. 03 Rangers don't have egr.

Did the same to mine. Starts a lot better with 800 cranking amps. Good idea.