4th-->2nd downshift is a no go.
06-03-2005, 03:59 PM
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4th-->2nd downshift is a no go. The 4L60E in my 2001 SS has been doing this for a while now and I'm just wondering what internally is wrong with it to cause this. The car had a procharger on it for a while, just thought I put that out there that the trans has had to deal with a little extra power in it's life. Here is the problem.
If I'm just cruising in 4th gear say between ~60mph-70mph and floor it the rpms will immediately shoot to the rev limiter and the car will not downshift. It should go down to 2nd gear for just a few seconds before going back up into 3rd. This is one of my favorite things to do when passing on the highway and now I can't anymore.
I know it's hard on the trans to do that and realize I screwed the trans up but, I'm just wondering now what is messed up in there? The computer has a stock tune back in it so the revlimiters and everything else has nothing to do with it. I have verified this with more than one tuning program.
Any trans builders out there have an idea? Is it something I could replace relatively easy myself with a rebuild kit?
BTW, the trans will upshift from first to second fine at WOT but, will not downshift.
Thanks in advance.
If I'm just cruising in 4th gear say between ~60mph-70mph and floor it the rpms will immediately shoot to the rev limiter and the car will not downshift. It should go down to 2nd gear for just a few seconds before going back up into 3rd. This is one of my favorite things to do when passing on the highway and now I can't anymore.
I know it's hard on the trans to do that and realize I screwed the trans up but, I'm just wondering now what is messed up in there? The computer has a stock tune back in it so the revlimiters and everything else has nothing to do with it. I have verified this with more than one tuning program. Any trans builders out there have an idea? Is it something I could replace relatively easy myself with a rebuild kit?
BTW, the trans will upshift from first to second fine at WOT but, will not downshift.
Thanks in advance.
06-03-2005, 04:14 PM
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I've never tried that at or near WOT, I will give it a shot later if the rain lets up. It will go into 2nd fine at part throttle manually shifting or letting it shift itself though.
I'll either have to start below ~60mph or above ~70mph so it doesn't TRY to downshift on it's own though....below 60 will probably be safer and also give me a little more rpm range to work with.
I'll either have to start below ~60mph or above ~70mph so it doesn't TRY to downshift on it's own though....below 60 will probably be safer and also give me a little more rpm range to work with.
06-04-2005, 03:21 AM
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When my trans went I lost the 2-4 band, while cruising in 4th it would do the same thing if I got on it hard, bounce off the limiter. I also lost 2nd under normal acceleration though, would stay in 1st up to 4k or so then drop into 3rd...do your part throttle 1-2 upshifts feel normal?
06-04-2005, 05:45 PM
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Originally Posted by thunder550
When my trans went I lost the 2-4 band, while cruising in 4th it would do the same thing if I got on it hard, bounce off the limiter. I also lost 2nd under normal acceleration though, would stay in 1st up to 4k or so then drop into 3rd...do your part throttle 1-2 upshifts feel normal?
