Disclaimer: All credit goes to Roid from Siren.
Testing how an item level syncs to 60 is always a hassle. Thankfully, in courtesy of Roid, we have some general guidelines for level 60 syncs. These are the maximum stats that each item slot can attain at Lv60 from level sync. Defense varies by job.
A rank :
B rank :
MNK THF RDM DRK BST RNG SAM NIN DRG BLU COR PUP DNC SCH
C rank :
WHM BLM BRD SMN
stat[α] = STR, DEX, VIT, AGI, INT, MND, CHR
stat[β] = Atk, Acc, R.Atk, R.Acc, Eva
Weapon: HP+24 MP+24 stat[α]+5 stat[β]+5 MAtk+10
Grip/Dual Weapon: HP+24 MP+24 stat[α]+5 stat[β]+5 MAtk+10
Shield: DEF A14 B14 C9
Throwing(slot): HP+3 MP+3 stat[α]+1 stat[β]+3
Head: DEF A24 B21 C17 HP+10 MP+30 stat[α]+2 stat[β]+3
Neck: DEF A5 B5 C5 stat[α]+2 stat[β]+5
Ear: DEF A1 B1 C1 HP+15 MP+15 stat[α]+1 stat[β]+4
Body: DEF A47 B42 C39 HP+15 MP+15 stat[α]+3 stat[β]+7
Hand: DEF A16 B14 C11 HP+12 MP+12 stat[α]+2 stat[β]+3
Ring: DEF A2 B2 C2 HP+10 MP+10 stat[α]+3 stat[β]+3
Back: DEF A8 B8 C5 MP+10 stat[α]+2
Waist: DEF A4 B4 C4 HP+20 MP+20 stat[α]+2 stat[β]+7
Legs: DEF A33 B30 C23 HP+10 MP+10 stat[α]+2 stat[β]+2
Feet: DEF A14 B12 C9 HP+10 MP+10 stat[α]+1
For clarification on how the varying defense values in regards to job ‘ranks’ work, here’s a brief example:
Askar zucchetto has the following stats at Lv75: DEF 23, STR+4, DEX+4, VIT+4, Haste+4%.
The maximum stats acquirable for Lv60 sync’ed head gear are: DEF A24 B21 C17, HP+10, MP+30, stat[α]+2, stat[β]+3.
Therefore, Askar zucchetto at Lv60 would have the following stats: DEF A23 B21 C17, STR+2, DEX+2, VIT+2.
However, the defense value is dependent on job. If it is equipped by a ‘rank A’ job, such as PLD, the defense on the helm would be 23. On the other hand, equipping it with a ‘rank B’ job, such as DRG, would yield a defense of 21.
Hope this helps.