Originally Posted by Hurstmeister

TKO 500 and 600 are the same except for the input shaft and some minor differences.
3550 uses a completely different case.

The original TKO was 3550 based. Uses a different shifter than the 500/600 TKO. Original 10 spline is rated 350 lbs. The 26 spline is rated 450 lbs. The 500 is rated 500 and TKO 600,.. well 600.

Not trying to spoil your sale,.. but should'nt lead someone into believing they are getting a TKO 500 when its 3550 based. They are different. Unless of course it is 500/600 based?

A picture would solve this.


Edit:

Here are pics of my TKO's

The first is a TKO 600
Notice the case and the shifter.



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This is an original 3550 based TKO. Both have 26 spline input shafts and 31 spline out put shafts. But are very different from each other.



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This is what a 3550 based TKO shifter looks like.




Hurst