What weight lube in 07 drw rears

[DavidThompson]

Will change out he lube in my o7 drw 3500... . to syn lube if does not currently have it... ANY one know ????? AND how many qts trucksalesdave... . central Georgia

 

[RobertP]

75w-90 is the weight, i would treat your truck well and give it a bath of amsoil severe gear 75w-90, it works great

 

[mberry]

NGM Deisel is correct on the weight. I have had very good luck with Royal Purple gear lube. It already has synthetic fluid in it, but I believe Amsoil or RP or Redline or x is better.