4l60e won't upshift
#3
RE: 4l60e won't upshift
Yes Sir, 4.10s and I haven't changed the speedometer because it usually shifts perfectly consistant and real firm like this,but when I set the speedometer for the 4.10s and a28 inch tall tire it shifted late and real sluggish, so I just put it back to original. I do think it is a pcm or electrical problem though,because it did this before and we rebuilt the trans and it looked perfect inside at that time. Thank you though, Shaun
#4
RE: 4l60e won't upshift
The only problem I have personaly had experience with shifting is when my Vaccum modulator came loose. It just refused to shift untill like 3500 rpm. Dosent sound like the same problem, good luck.
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