Before we start, here are some terminologies:
1s means gears with 1 stat - synthesis value 22.
2smeans gears with 2 stats - synthesis value 31.
3s means gears with 3 stats - synthesis value 39.
Unbound item + Unbound item + Unbound item = Unbound item
Even using one bound item will make the final result bound.
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Format
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Item to modify + Catalyst + Catalyst = Product (success rate)
If the success rate is not 100 that means the item could end up unchanged.
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Miscellaneous
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Annonymous Name Card + 2s + 1s = Hand Grenade (90%)
Hand Grenade + 2s + 2s = Demon Proof (60%); Feather (10%)
Exploration Key + 1s + 1s = Another Exploration Key
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Food
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Beer + 1s + 1s = 1.6x EXP Mark (90%)
Beer + Anonymous name card + 1s = 1.6x EXP Mark (80%)
Riceball + 2s + 2s = 1.6x EXP Mark (60%)
Sausage + 2s + 2s = 1.6x EXP Mark (60%)
Eternal Focus potion(any type) + 1s + 1s = Konoha secret ingredient
Konoha secret ingredient + 1s + 1s = Toad scret ingredient
Pet food from shop + 1s + 1s = Another pet food (could be one with greater feeding value)
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Suits
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Grey suit + 2s + 2s = Blue suit
Grey suit + 1s + 1s = Grey suit of another character (one of the 1s may be replaced with an item sync value 15)
Grey suit + Grey suit + Grey suit = Blue suit(40%)
Blue suit + 1s + 1s = Blue suit of another character (one of the 1s may be replaced with an item sync value 15)
Blue suit + Blue suit + Blue suit = Orange Suit (40%)
Blue Suit + Blue Suit + 3s = Orange Suit (70%)
Blue Suit + 3s + 3s = Orange Suit (80%)
Blue Suit + 3s + Lucky Gem = Orange Suit (90%)
Orange Suit + 1s +1s = Orange Suit of another character (one of the 1s may be replaced with an item sync value 15)
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Gears
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1s + 1s + 1s = 2s (40%)
2s + sync value 32 + sync value 32 = 3s (40%) sync value 32 can be food, exp seals etc.
2s +2s + 2s = 3s (40%)
3s + 1s + 1s = 3s of another kind
3s + Lucky gem + National Cup trophie = 4s (60%)
4s + 2s + 2s = 4s of another kind
=Edit
Pets
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Sync value 30 pets + 1s + 1s = Another Sync value 30 pet
(Anko is fugly)
Sync value 30 pets + 2s + 2s = Sync value 40 pet (30%)
Sync value 30 pets + 3s + 3s = Sync value 40 pet (80%)
Sync value 40 pets + 1s + 1s = Sync value 40 pet
Sync value 40 pets + Anonymous name card + Anonymous name card = sync value 30 pets
Sync value 30 pets + Anonymous name card + Anonymous name card = Vulture
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Quest Related Item
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Anonymous Card+ Anonymous Card+Anonymous Card= Anonymous Card Folder
Weapon+ Weapon disassembler+ Weapon Disassembler= Iron Ore
Armor+ Armor Disassembler + Armor Disassembler= Iron Ore
Acessory + Acessory DIsassembler+ Acessory Disassembler= Iron Ore
Weapon+ Mystery Disassembler+ Hand Grenade= Rare Iron Ore (60%)
Armor+ Mystery Disassembler+ Hand Grenade= Rare Iron Ore (60%)
Acessory+ Mystery Disassembler+ Hand Grenade= Rare Iron Ore (60%)