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Originally Posted by JBCOBRA
Is it possible to swap out the .64 5th for a .82?
JB
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Without ever working on a tremec, I would guess that you would need to swap the countershaft gear as well as the OD gear. It may be better to buy a new 600 and sell your current one.
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Originally Posted by 427SnakeSC
JB, not sure of the TKO600, but I plan on having the 4 gear in the toploader I will be using in the CSX I have on order, changed from the 1.1 to the .82. I don't see any reason why any transmission could not be worked on.
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4th gear in a toploader (non-OD version) happens when the output shaft couples directly to the input shaft, I.E. 1 : 1 ratio. There are no gears involved for 4th gear. What ford did with their OD version of the toploader, is to make 3rd gear the OD gear, less than 1, and then switch the shifter rods on the tranny, so when you went into third gear, you were really using the old 4th gear, 1 : 1, and then when you went to the new 4th gear, you were going into the old 3rd gear, which was now geared to be an overdrive. The problem with these trannys is that #1) the gear spacing is too wide for a performance usage, and #2) the trannys themselves are weak.
If you want an "OD" like toploader, get a wide ratio version, with a 2.78 first, and then get 3.07 / 2.88 rears, and you'll have in essence a "OD - Like" toploader, maintaining strength and some performance usage, with some economy at cruising