Thanks everyone for the replies,well after much searching and deciding how I was going to go about this,I made the decision to go with a high nickel rod.I got a stick rod and removed the flux and cleaned it very well.I used my tig to weld the rearend and I skipped around a little,it welded very nice...

Thanks for the reply Steve.I too questioned if it was cast steel or cast iron.most people said to do a spark test.When I was prepping the rearend I had to clean some brackets off of it so I was grinding on it and then I would grind on the center section to see if there was a difference in the sparks...

Thanks for the replies,I am new to the site.I tried a search before posting but could not find anything,probably did not do it correctly.I would think welding this a little at a time would be the best bet to keep the heat input down.I am open to suggestions and thanks again.

Can I use aluminum bronze to weld steel axle tubes to a cast iron center section or is there a better rod for this(strength wise).Thanks