car shifts twice in OD...
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Join Date: May 2003
Location: Prairieville. La.
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In a related problem to what has been discussed is what I am experiencing now. That is I had a Trailblazer torque converter ('04 and above) installed in my '03 GMC. I had Redline ATF put in it at the same time. Since that change I have had a problem with the PWM between 45 @ 55 mph. The torque converter locks up - about a 500 rpm drop - but after about 2-3 seconds it partially unlocks - about a 100 rpm increase. If on flat ground this starts a cycling of what appears to be the PWM causing it to partially lock, then unlock, then lock, etc. This continues as long as I am between the 45 - 55 mph range. Above 55 the cycling stops but I can't tell if it is locked or partially locked.
Another difference in before and after is lockup doesn't occur until I am 3-4 miles down the road when engine is cold. It would lock up immediately after reaching enough speed before change.
I have the Transgo shift kit sitting on my work bench but don't want to install until I have this aggravating "cycling" eliminated.
I'd like to eliminate the varible lockup completely if possible.
Any help is appreciated.
Thanks.
Another difference in before and after is lockup doesn't occur until I am 3-4 miles down the road when engine is cold. It would lock up immediately after reaching enough speed before change.
I have the Transgo shift kit sitting on my work bench but don't want to install until I have this aggravating "cycling" eliminated.
I'd like to eliminate the varible lockup completely if possible.
Any help is appreciated.
Thanks.