what front could I pair with D60?
Also, do you think the 20 would make a solid front for 35-37 tires?
You could pair the D60 with a 3/4T D44. Basically a beefed up D44 with D60 outer knuckles. Or the other option is another D60. You could use a 1/2T D44 as well, too.
The M20 from an SJ is pretty beefy. Keep in mind that the Model 20 is larger then the D44 but smaller then the Ford 9". The axle tubes are also pretty big on the SJ and the SJ uses one-piece shafts. These are the main problems with the M20 on the CJ's but didn't plague the SJ's. The only downside to a M20 is gear selection, which only goes down to 4.88:1.