Originally Posted by mrvedit

I was also wondering if the 4L80E might give a better ET than a 4L60E because the 4L60E has such a huge difference between the gears - the 1-2 shift drops you from e.g. 6500 rpm to just 3500 which is too low for a hot cam.
I considered the tighter ratio 4L60E gears available from PATC which they claim will reduce the ET by 2 or 3 tenths. However, the gears alone are $1150, and you have to rebuild the trans AND you still end up with only a marginally-strong 4L60E.
While I believe their lower ET claim, I'll save the money for a 4L80E instead.
Just my thoughts; I look forward to more experienced opinions.

Originally Posted by CRAZYCUTER4.8

Champion Motors in Canada ran a 9.40 in a C5 and dropped to a 9.0 with the planet set. They have used a bunch of them, Kris @ CK Performance also helped them in development of that planet. I researched the claims when I rebuilt my 65 last time and pulled the trigger on one. They dont mention it but the 2-3 shift seems much tighter as well. I have a large duration cam with a tight LSA in this vehicle and they compliment them nicely. Have yet to test it at the track but seat of the pants feels much nicer.

Originally Posted by eb02z06

That was my car-I have a brand new 2.85 gear set availale if anyone wants to buy it.

PM me.