If you can get a d30 for $54 get it. Get me one too while your at it. It's a really easy swap. Depending on what you want to do you can get an Aussie for $239. You'd still have money left over for other stuff. You could run the Aussie with the 249 if you don't see a lot of snow. Why not take the extra cash and buy a np231. I've seen them as cheap as $100 and it's a fairly easy swap.
1991 Jeep Wrangler 4.0l auto
1995 Ford F350 Crew cab 7.5l
2002 TJ, 1995 YJ, 2 1994 YJ, 1978 CJ7, 1970 CJ1, 2008 Grand Cherokee, 1997 Grand Cherokee, 1994 Cherokee, 1988 Comanchee