I have two 4D55's and one 4D56 and each one takes a different oil filter. I have a 1984 Dodge Ram 50 with a 4D55 that is parked because it needs bearings in the trans. That one takes a large black Mitsubishi duel element filter of which I have about six. I have another 4D55 on the floor in the garage with a broken head. That one takes a pretty standard 7 dollar oil filter. Then the 4x4 Dodge Ram 50 I'm driving now has a different filter yet. It is a fairly large filter and also a duel element filter. That one is a Car-quest filter number 85067. I was also thinking of switching the oil filter housings from the engine that I have the six filters for. Are the blocks the same so that I would be able to do that? I could take the standard filter housing from the one with the broken head but I really like the idea of the large duel filter and I have six of them. Any Ideas would be appreciated. Later, Rick
from what i know. and iam still learning. its a never ending thing. that all 4d55 blocks are the same. there real close to the g54b. parts cross-over. oil pans. crank and rod bearings. and even silent shaft bearings. probably more, its a little early for me to be up. and the 4d56 are close as well i know you can use a head from a 4d56 on the 55 and the injection pump as well.have you compared the mating surface of the oil filters.(rubber seal) i would make a guess that they are all the same size. you may not even need to change anything if it fits.
-------------------- 87 raider with 2.3td ,5sp, manual hubs, rear lsd, duel bouncy seats full eninge rebuild. runs strong but always tinkering.
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