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Shopping for a tremec but I dont know the difference between a 3550 and a TKO other than the TKO is more expensive.
Thanks
 

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Please call me Mike
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tko is stronger and uses a different input and output shaft. For about 90 percent of small block (302 and some 351's) a tremec 3550 is fine
 

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The TKO is stronger BECAUSE it uses a bigger input and output shaft. In fact, mine is a 1/2 TKO because I replaced the 3550 output shaft with the TKO output shaft. Gears, etc. are identical between the two.

Note: the tailshaft housing has to be re-bored to accept the larger bushing and seal that the TKO shaft uses.
 

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RobKong
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