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Discussion Starter · #1 ·
Harsh 1-2 Shift at Half Throttle and WOT

Test drove a 2wd TBSS yesterday that was in seemingly outstanding condition. Ran great, felt tight and extremely fast for a stock truck - The only thing that I didn't like was how the transmission shifted from 1st to 2nd. I read through the sticky about transmission failure warning signs and it sounds like this could be a bit of a red flag, but I wanted to provide some further details about my exact experience and get some opinions.

When I first started driving, the shift from 1st to 2nd and part throttle (maybe 2/3rds) resulted in a slightly delayed and pretty hard shift. However, when leaving from a stop at light throttle (say 1/4) the shift felt normal and smooth. Then, at WOT, it went to 6k RPM before shifting (without lifting off) and the shift felt pretty hard again, but not necessarily unlike it should, in my mind, at WOT. Everything else, shifting out of park, 2-3, 3-4, downshifts, etc. seemed totally normal. Just that 1-2 shift at part throttle really caught me off guard, and it did every time.

You opinions on this matter would be greatly appreciated. Thanks, in advance.
 

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The Realest
TrailblazerSS
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434 Posts
I am aloso experiencing that hard 1-2 shift, stock tran so im hoping that its not a sign of bad things to come
 

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Discussion Starter · #3 ·
Just realized I accidentally put this in the 4L80E section. Meant for it to go int the 4L70E section. Sorry about that!
 

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TrailblazerSS
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well it's ok you put it here..... as you probably need to be looking here anyway when you 4L70 takes a dump like mine did and then your gonna wanna step up to a 4L80 like i and others have done. hope mine is back on the road with the 4L80 soon! naww man hopefully your will stay alive, just seems like alot of those 4L70's dont live very long lives
 
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