97 Rodeo AT comes out of Lockup at 60mph+

[richierelax]

Greetings experts,

1997
V6 4x4
120K
tranny

I recently had AT rebuilt. Shifting seems ok when driving 60 or below; no slipping. However when going above 60 mph, it feels and sounds as if AT is coming out of lockup. For example: After accelerating up to 65 and putting it on cruise control, the odometer jumps from 2.2 to 3 rpm. In other words, ( i believe) AT comes out of lockup...when it shouldnt-on a flat road or going downhill.

Originally the tran shop said to replace TPS, which i did but it did not solve the proble. Brought it back to shop after receiving Torque Converter Slipping code and according to them they replaced torque converter. Aamco suggested i verify shop replaced the clutch valve cylinder inside the tranny. However, i think the shop will say they did regardless.

I read alot of the AT threads on here and also did a seaarch but could not find anything relating to this. Please let me know if you feel I may have overlooked something.

Thanks for your help, this is a great forum!

[amigo-2k]

I would start by checking the fluid level. If it is to low it can cause this.

[richierelax]

Thank you for the advice; I will do so this evening and let you know. Have a great day.

[trooperbc]

in addition to the fluid level, are you saying it only happens when you are in cruise control, and that it only happens when you are in the top gear?

//bc