98 c1500 out of know where the tranny kicks

[84CUCV]

happens when im on the throttle. sometime its so hard the whole trucks jumps. has a 5.0 4l60e. motor has full tune up. did the intake gasket about 2 years ago. just did a filter change on the tranny. no codes.. any ideas? over all this has been a great truck. thanks

 

[Greg Ducato]

Any particular gear or speed when this occurs?

 

[84CUCV]

no at all. happens when im on the throttle..

 

[Greg Ducato]

That one is tough to diagnose without hands on. It could be a rough shift from overly high line pressure or could be a misfire in the engine while the converter is locked or several other things. If it has all the gears and lockup then I would install a pressure gauge and make sure pressures are normal. The trans will only do what it is commanded and many times it is computer related or even a dirty mass air sensor causing pressure spikes.

 

[84CUCV]

That's were all start then. Checked the line pressure and clean the mass air sensor. Thank you

 

[Greg Ducato]

Normal pressure in drive at idle is 60-75 psi rising to 150-175 at wide open on a stock trans, reverse line pressure can be nearly double those numbers