What exactly would my top speed be since now I'm runing a 4l80e with stock stall and 4.88 gears with a 30.4" dia wheel. 265/50/20s. 2wd. The engine is a lq9 6 liter with long tubes and intake. Ory 3" cat. Just got rid of my 4k stall converter. So I'm awaiting better mpg.

 

And if I put a cam in there what can I expect to change of difference can I expect to get on the top end speed.

 

148.3 @ 6000rpm
150.8 @ 6100
153.3 @ 6200
155.7 @ 6300
158.2 @ 6400
160.7 @ 6500rpm


These are rough numbers if you were in 4th gear without converter slip and if you actually had the power to pull OD and a strong enough converter to handle that. Pushing those speeds in OD is asking allot.

 

What about numbers in 3rd? Thanks for the help

 

111.2 @ 6000
113.1
114.9
116.8
118.7
120.5

 

Follow this link and download the file and you can play with tire size, ratio etc.

https://www.performancetrucks.net/fo...0-4l80-396210/