Need help diagnosing WOT slippage

[ritous1]

Well guys, I think the supercharger has finally taken a toll on the 130k mile tranny. I can't say that I've been taking it easy on her. I punch it all the time. Lately I've noticed that any attempt to go wot is met with slippage. It doesn't matter if it's from cruise or from a stop. It shifts and accelerates fine under part throttle and gradual increases in throttle. It seems that the torque generated when I hammer it is overpowering the torque converter. Tranny fluid looked good at last drain, filter change, and refill. There was very little clutch material in the pan. That was all done after the first time I noticed this issue. I had already been considering an upgraded converter, but want to make sure it's not time for a rebuild before I blow my dough.

[redfury]

I think the best way to diagnose this would be to watch the transmission with a scanner to see if it's a problem with the converter or the clutch pack. Does it slip in every gear when you punch it?

[ritous1]

When I punch it, it will down shift and rev high but wont go. The first time it happened I thought I was spinning the tires, but there was no squeal. Funny thing is you can let off then increase throttle gradually and all is well. The shifts are just as firm as when I first installed the shift kit. That's why I'm thinking it's the converter. Haven't tried anything with a scanner connected.

[redfury]

what about when you manually shift it through the gears? If the slippage is the same through all the gears, then it isn't the clutch packs. It's either the converter or the pump. Might just be one of those times to have a tranny guy diagnose it if you can afford a small fee to have them do it ( if they'll even charge you...who knows ).

[ritous1]

are you suggesting I floor it while manually shifting? I'm kinda affraid to try that, seems like it would do more damage.

[chevymaher]

Just a quick question.Are you sure your tires squeal when you spin them?Mine I can brake torque them till they smoke and the make no noise.same sound as spinning in water,almost nothing.You should have enough power it spins like that.Have some one follow you and punch it.If it is in the transmission I wouldn't worry about doing more damage.Damage is already done.And wont go away till it taken apart and rebuilt.

[ritous1]

Dont forget I'm running 20x9" wheels with 255/35/20 tires that seem to grip like crazy. The most I've ever gotten out of them are a 2nd and 4th gear chirp. Never tried a brake stand. I guess I'll try what redfury suggests and see what happens.