Engine/Transmission (1994 - 1998) Trans mission acting odd

[4570]

I have noticed a few times while driving about 60 to 70 mph in OD and on cruise control ,the tack will go up about 300 rpms for a few seconds and then drop down to normal and then go up again . I can drive it so far with out the cruise and it doesn't seem to do this . Its on level road ,no hills and I can hear the difference in rpm but the speed remains the same .

 

[fox]

Check your battery grounds.
Then if it still does it search for electrical noise from the alternator.
A electrical filter fixes almost all of them doing this.

 

[BigPapa]

It is the torque converter unlocking and locking. Check the things fox suggested and search for older threads an articles in the mag.

 

[Grizzly]

With 84.5k miles you may need a transmission rebuilt.

 

[4570]

Its got about 150 k on it now . It hasn't acted up since I posted this . Untill it gets to be a more common thing I guess I will just keep my eye on the tack .Then add the foil to the charging wire to see if that helps .