Problems Shifting on a 1952 GMC M135

I have a 1952 GMC M135 and it has an automatic transmission. It wil go into drive and reverse in low and high range but when driving it will not shift up

Have you used the forums search feature? There are MANY, MANY threads that cover this problem with the Hydramatic. Another way I search a specific forum for information is by using google. For example, go to google and type in the following:

shifting problems site:steelsoldiers.com/early-deuce

This search will yeild many threads on the topic. In fact, click on the one called "hydramatic heaven". It's great reading for anyone who owns a GMC with the Hydramatic.