What transmission does my chevy truck have?

Keizer

New member
its a 1988 Chevy 2500 6 lug with a 5.7 350 in it. it is an automatic and i believe the tranny is stock too. also, it shifts funny around 25mph and if it doesnt do it then it does it at 35mph. it starts to shift, revs up high, then shifts, then the rpms go back to normal. its weird. so i guess im wondering what kind of tranny is it (700r4? THM350? 4L80E? etc..) and if i should get it looked at.
 
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