I'm getting ready to get a rebuilt injection pump for my stock '83 K2500. I have a spare 4581 pump from an '89 LD K2500 and I was wondering if that would be a better rebuild candidate than the 4153 pump that originally came in my '83. Were there many updates/upgrades over the years that would make the 4581 a better pump to use? Could the 4581 be build to stock HD '89 specs? Both pumps are from manual transmission trucks.


Also, when having a pump rebuilt, what would be good to look/ask for? I had a list going, but wanted to run it by you guys to get your thoughts.


- steel sleeve for advance bore to prevent wear?
- all new Stanadyne parts
- new solenoids such as the HPCA and engine shut off?



Thanks!