[Fordfan69]

Hi guys,

I have measured the gears both new ones now pre-assembled in box, and old failed ones. The measurements are as follows:

3rd gear driven gear width: .975"
3rd countershaft gear width: 1.010"

The difference being: .035" (insignificant, in my opinion)

Mis-alignment from 3rd gear to 3rd countershaft gear: .140"

This equates to 14.4% of the total width (SIGNIFICANT, in my opinion)

This means (as you surmised) 650 ft./lbs. - 14.4% = 556 ft./lbs. capacity.

This is a reduction in strength of just about 100 ft./lbs..

My 450 ft./lbs. at the wheels + heavy car + very soft street drag tires = probably over the capacity of the available 556 ft./lbs. of capacity at the tranny.

I really think this theory is correct. Has anyone had the opportunity to check their tko600 yet? I would bet many if not all with the single countershaft are the same.

Greg.