Can the 2-3 "clunk" be tuned out??
03-10-2016, 08:40 PM
#1
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Can the 2-3 "clunk" be tuned out?? First off I have to say I just completed a performance rebuild using PBA's top shelf kit and his knowledge and advice. The tranny works great along with the circle D 3600 stall.. Progressively harder shifts with throttle is where its at!
Now the 4l60e transmission has the infamous 2-3 shift clunk at light throttle only. This is inherent from the performance parts installed. I know why its doing it, the 2-4 band is releasing sooner than the 3-4 clutches apply which causes the trans to freewheel for a split second then bang into 3rd gear. The downshift from 3-2 is the same. WOT is absolutely perfect!!
What I am wondering is if there is something I can do to the transmission tune to minimize this condition. Line pressure, shift time, etc. I have HP tuners.
If anyone has any experience with this I would greatly appreciate the help!
I also want to give Kudos to Dana, so great to work with and his kit was so well built and straight forward to install!!
thanks
Paul
Now the 4l60e transmission has the infamous 2-3 shift clunk at light throttle only. This is inherent from the performance parts installed. I know why its doing it, the 2-4 band is releasing sooner than the 3-4 clutches apply which causes the trans to freewheel for a split second then bang into 3rd gear. The downshift from 3-2 is the same. WOT is absolutely perfect!!
What I am wondering is if there is something I can do to the transmission tune to minimize this condition. Line pressure, shift time, etc. I have HP tuners.
If anyone has any experience with this I would greatly appreciate the help!
I also want to give Kudos to Dana, so great to work with and his kit was so well built and straight forward to install!!
thanks
Paul
03-13-2016, 09:14 PM
#2
I've never heard of a tuning solution in 12+ years on this forum. It's something most of us just learn to live with. Mine's been doing it for 100k+. I will add that having a one piece aluminum driveshaft may likely increase the audible perception of it. It seems to me that the "clink" that I hear is coming from the driveshaft.
03-13-2016, 10:36 PM
#3
Moderator
Interesting problem that some people are having.
My 2-3 shift is quick yet smooth at all throttle amounts and I even have an aluminum driveshaft. No clunks or clicks.
OP: How big did you drill the 3rd feel hole (also called the 2-3 shift hole) in the separator plate? Did you install a 2nd cushion spring in the servo?
My 2-3 shift is quick yet smooth at all throttle amounts and I even have an aluminum driveshaft. No clunks or clicks.
OP: How big did you drill the 3rd feel hole (also called the 2-3 shift hole) in the separator plate? Did you install a 2nd cushion spring in the servo?