What should Tranny temps be?
 

With my glow shift transmission temp gauge I'm getting like 102 on the highway and about 120 while in gear idling at a stoplight. This can't be normal or is it? Should I ditch the transmission test port extender? Thanks

That seems a bit low. We are talking Fahrenheit, right?

Yes ferenheit and the highest I've seen my gauge go so far is 125, could it really be this low because I have a deep dish tranny pan? Or would this transmission test port extender really be not giving me a good reading ?

you want trans temp to be around 50* degrees cooler than engine temp. This applies on an average warm day not towing. Winter time and very hot days in summer the temp will vary from that. 150* is usually about the norm for regular driving.

Yup. That sensor needs to be in the fluid, not out on an extension. Think of the extender as a little heat-sink/radiator.

Mine is usually 130-140, regular driving on a temperate day. Idling in the summer it shoots up significantly, as it does towing up hills, unless I'm on the highway then it's pretty much 150 tops.

I think im going to end up dumping the extender and putting the sensor into my derale transmission pans 1/8" port where it should be!