The reason I ask is I have my shift points for my 2-3 shift set at 5700 rpm's.With my gear ratio and tire size this comes out to be 74 mph.The transmission is shifting right at 70mph.I was beginning to think maybe the trans is slipping but it shifts the exact same and mph everytime and doesnt feel like its slipping.I dont know much about converters but I have heard they will slip some under WOT.Is 4 mph about normal for converter slippage.Mods are in sig.

Thanks,
Randy

 

I may have just found my answer....amazing what the search button will do I did a search in the drivetrain section and found a post that stated a good rule of thumb for converter slippage is 5-6%.....that would be right at the 4mph i'm seeing.
Does that sound right??