300/440/550 Quick Q: is the 300, 440 and 550 all the same pump? impellers interchangeable?

[98mkiv]

OK Kawi Gurus, I need you to dig back into the cobwebs for me. I've got a '90 300SX and want to put in get an impeller to send to impros to have repitched. If 440/550 interchange into the same pump, can I pick up a cheap used on from a 440 or 550 and send it out to be re-pitched?

Please only answer if your certain

Thanks!

 

[Kohldanielzimmer]

300/440= same pumps and impellers.

550-js (82-86) different than 440/300 and also unique from the 550-sx(91-94) which also doesn't interchange with 440/300