When crusing at highway speeds 65-70 and i try to use crusise control the engine kicks out of overdrive into 3rd gear. This just beacuse of the year truck (type cruise control put in) or is this not normal?

 

My factory cruise on the 87 Runner does the same thimg on occasion. Sometimes on the slightest of grades. kicks up to 4000 or so, stays there for 10 seconds and then back to OD. The V6 of mine rarely does does it.
Probably normal in your case.

 

Mine has been doing that since it was new in 93. The slightest little hill and it will drop out of OD. The only way I use cruise now is with OD turned off and set at 65mph or less.

You might try adjusting the kickdown cable and see if that makes it better. Maybe a little more slack in the adjustment would keep the tranny out of the loop a little more, (I'm just guessing here).

 

check this out

https://www.yotatech.com/forums/show...ght=cruise+fix