She tipped the scales at close to 6500 with the 6.5 in her. The DURAMAX/ALLISON adds right at 300 pounds to her over the 6.5/4L80E. Then figure in the intercooler and extra steel I added in to my radiator support(I cut out alot of thin sheet metal and added in 1 inch angle iron and 14 guage plates to re-inforce it) it adds in quite a bit extra. She aint no feather weight, that's a fact. Just wish I could get the trans to shift consistently all the time.