More slipping AW4 questions

Ok my AW4 worked fine untill today. All of the sudden it won't shift out of 1st gear. All of the other gears shift fine. It just stays in 1st gear untill I let off of the accelerator. Does it sound more like a TPS problem or an actual transmission problem? TIA

Neil

I had a similar problem in my 87. wouldn't shift unless i let off or ran out the tach. check your tps with a volt meter. if you don't have the numbers it should be giving you, either i or someone else on here can look it up for ya. i wouldn't worry too much though...i hope