1999 Chev S-10 Blazer Sticking - Drive Train & Driveline

Question: I have a six cylinder S-10 Blazer, 4.3L, 2WD. The transmission does fine all day around town, no problems at all. When you take a trip that is about three hours or more the transmission has a problem shifting from 2nd to 3rd gear. When you stop and take off, 1st to 2nd does fine. 2nd to 3rd acts as if it is hung and then it jerks the vechile, "pops" loose and goes in to third. Once the vechile have been parked and cooled off everything works fine. I'm trying to determine if I should replace the solenoids in the lower part or the transmission or if the whole transmission needs replacing? Any thoughts?

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Technican: It does sound as if the solenoids are the culprit.. best rule of advise I can give you on this would be to take the truck to a shop that has a portable scantool which gives a datastream display on the transmission. If it is the solenoids acting up the tool will detect it. Beats having the tranny ripped open only to find that it was the solenoids. Saves you money to start with this first.If I can be of further assistence you can email me at upon acceptence of this response. ASE Master Tech
Owner: I do all of my own auto work and was just trying to determine if I should replace the transmission. I have a scanner and there are no codes, so I guess it's not the solenoids. Also, I need to correct the comment on which gears, it's from 1st to 2nd that there's a problem and it seems from what I've found that this transmission has this as a known problem. thanks!

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