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If the transmission tag is still on it a 3550 will have TR3550 on it along with a number that starts with 260XXXX, as for the T5 its number will start with 13-52-XXX-XXX. Also T5 cases will also have a 13-52-XXX-XXX casting numbers on them. Yet another way to tell is this, the 3550 looks almost identical to a TKO600 and it will have a couple of, roughly, 4"x4" tin plates on the top of it along with the shifter top. jimig@standardtransmission.com
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