Originally Posted by rusty65
Does the 3.35 vs. 2.95 gear ratio make that much difference?
It makes a big difference. It's the same difference as a 3.00 vs 3.40 rear gear (when you are in 1st gear). What rear gear ratio do you have now (or what will you change to)? If you have 2.70 to 3.00 rear you'll benefit by 3.35 first gear. If your rear gear is 3.50 or numbericly higher, you'll want the 2.95 first gear, otherwise the RPMs will wind up too quick (like a granny gear as mentioned by 2+2GT).
I went with a TKO-500 with a 3.27 first gear. The rear gear is 3.00 and the combo turned out great with alot more pull in 1st gear than the old automatic C6 had (which had a 2.46 first gear).
Not all t-5s are built the same either, so it depends on how much torque your engine puts out. Some T-5s were ment for only 4 cyl cars. The world-class (as shown in your link) T-5 WC is more heavy duty for mildly built v8s. The T5-Z is actually the best rated at 330 ft/lbs torque built for the Cobras.
I went with the TKO-500 which is rated 500 ft/lbs because a stock 351C puts out 370 ft/lbs. With a 65
though, you better stick with a T-5, due to fitment problems with the TKO (unless you have a beast in that 65!).