My truck is a 2500hd on 35's with a 6.0l and 4l80. When I first installed my 4.88's they were a huge improvement over the 4.10's. Since then I've added a converter, cam and tvs1900. Low end power is pretty strong but it feels lacking on the top end. It almost feels like it would run better with the 4.10's in it. I'm going to be going to a 92mm Holley throttle body tonight, maybe that will help. I'm just wondering if anyone has done the supercharger first and then gears?

 

What size cam?

 

It's 218/232 112.5+3.5 .578/.578. Cam Motion

 

Is it an RPM you feel it dropping off?

Thats a cam thats definitely going to shine in the mid range. But it should make power to 6000 RPM just fine.

 

It just pulls a lot harder up till 4800 rpm or so then flattens out quite a bit. Still pulls but not nearly as hard. Maybe the t-body will help it out up top.

 

 

Are you still running the 78mm?

 

Yes, my new 92 came in last night. Putting it on tonight.