5 Liter Eater

I don't see how it's possible to mix and match 5th and 6th ratios (EG: ZR1 5th and Z06 6th) seeing as how the meshing gears are cast into the countershaft.

JoesC5

There are two ZR1 transmissions. They both have the same gearing 1st through 4th, but different 5th and 6th ratios.

slow ride

On a t-56 they were one gear for both 5/6 that pressed onto the shaft using only one small set of splines on the end to transfer power. A 6060 has 2 separate splined gears.

Unreal

I would not touch anything and enjoy it. T56 is pretty damn strong and I would worry about if it breaks. My stock t56 is going along just fine. Had a built 6060 in the garage forever now but my damn t56 just won't quit. This is well in excess of 1000rwhp.

5 Liter Eater

Ah OK. My 6060 ignorance. Haven't been through one yet. Hopefully I don't need to.

And I was still thinking of the T56 wrong. 1-4 countershaft is one piece. 5&6 are one piece and pressed on like you said, not cast into it.

erick_e

Somewhere on the forum there was a link to a awesome gearing calculator which would calculate speed and rpm from gear to gear.

If someone remembers what thread it was in it might be useful to you.

EDIT--

Just found it

http://gearcal.com

Streetk14

Yeah, you can do all sorts of combos on the TR6060s if the builder knows what they're doing. I had Rockland Standard Gear build mine since (at the time) they were the only ones who seemed knowledgeable and willing to do these type of gear combinations.

And for anyone else wondering.....the ZR1 5-6 gears work out to an .80/.63 when paired with a 2.66 1st, while a ZR1 2.29 1st would work out to .81/.67. I still like the idea of the .80/.50 combo, though there would be a huge RPM drop between 5th and 6th.