my 1976 j10 jeep will not get overdrive when speed is over 40 mph why?

[emilio]

im having problems with my j10 jeep shifting into overdrive or better known as passing gear...when going up a hill goes all the way down to about 30 to shift to passing gear. it does shift well into all gears except when i floor it, it just gains speed. it has a 360 with automatic trans...help plz

 

[JPNinPA]

Is the fluid level correct and color look good? Did you use the correct weight oil?
Could you confirm if this is a 727 trans?
https://www.lokar.com/assets/instructions/INS0046-ChryslerKickdown.pdf
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[dwillys]

overdrive is not the same as passing gear.

 

[biggerhammer]

most of the 1976's are turbo 400's, check your vacuum source is connected to tranny, it normally also has an electric kickdown, verify connedt and attached to throttle.