I have been comparing injection pump numbers and I am a little confused on the RPM portion listed on my steel info tag. I have a Stanadyne DB2829 RPM 4126 on my 6.2. I have seen many Stanadyne DB2829 but the RPM numbers vary alot and I could not seem to come across one with RPM 4126. Can I use others? For example a DB2829 with RPM 4544? Any input on this is appreciated!

Thats not the RPM thats the Model number DB2829-4126, and thats for an '82 model. Rated RPM is 3400 for all the 6.2s.

So can I use all DB2829 Models on my 6.2?

To a certain extent, yes, they will all function, earlier models with non adjustable guide stud will red line much higher (4000+) than later models with the adjustable guide stud (~3600). Later models will have other improvements that help longevity and power, I would stay away from that 4126 if I were you.

Thanks for your help! :)