my truck has a 4l60 with a lockup converter, now when i bought my truck he told me it had a new trans because the other one too a dive cuz they were haulin heavy machinery, i originally thought my trans was shot because it would shift real real late. but now i think its the torque converter. when i just cruise the trans shifts nice and firm. but when i get on the gas it acts like the trans is slipping (it revs real high real quick like its in neutral) but after a couple seconds it shifts firmly so im thinking when they replaced the trans they left the original converter.
what do you guys think?
thanks
stevey