97' 4T60E, it'll hang up in 1st all day til I let off the pedal causing it to shift into 2nd, than 3rd works fine, shifts into OD at about 45mph. Cruises 70 mph down the road in OD staying in gear and partial throttle will accelerate like should, soon as your into WOT it'll grab and bounce of the rev limiter, til I let off the gas to shift just like the 1-2 shift... I just changed the filter added fluid plus some Dura Lube... what would cause this symptom? Does not have no vacuum leaks what so ever, modulator is good.. anyone know of the symptom its experienceing? http://www.scribd.com/doc/34146615/4T60E Look at the 1st and 2nd gear in Overdrive, plus 3rd, and 4th if you will... Also the 3-2 shift down in Overdrive for WOT acceleration-(this uses the B solenoid) and the 4-3 shift down, which my transmission works fine for this and is using solenoid A for this one ... I'm definetly thinking maybe a 1-2 shift valve sticking, Especially since the factory ones are aluminum and could perhaps have some metal or gunk in it... I mean what else will cause the 3-2 kickdown to hit the rev limiter if I dont let off the gas to help shift? plus the 1-2 shift?... i'm pretty sure the bands and clutches are good in this transmission, it really feels like it. Any transmission guys out here?

Just to clarify, 1-2 and 3-4 will not upshift at WOT? But all kick-downs work without any delay?

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Boost addict


The Fleet:
'93 SSEi - Twincharged + manual Build thread
'97 Camaro - Top swap
'05 STS - V8, AWD, her DD
'92 Trofeo - Fair weather DD
'99 Montana - top swap 3800
'04 Sierra 2500HD - LLY Duramax

Current project:
Something cool, trust me.

Upcoming projects:
'92 Bonneville SSE
'87 LeSabre T-type
'67 LeSabre

Gone to greener pastures:
'84 Sierra Classic - Twin turbo 3800
'97 LeSabre - Top swap

RIP:
'86 LeSabre - pictures
'93 SE - L67

Did you go with a different gear ratio?