ET difference between 4l60 to 4l80
TECH Apprentice
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Joined: May 2004
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From: Texas where Bigger is Better
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.
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.
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.
PM me.
