Sawwping form a 3.23 to a 3.73 rear end? I can't recall if it was the gear swap of stall converter that effects you with a lower dyno output. If so by how many does it lower your output?

 

switching to 3.73's will affect your dyno numbers and give you a lower rating but by how much I am not really sure.

 

The converter will, especially if it isn't locked. It allows more slippage.

 

Changing gears doesn't usually affect hp/torque numbers, I tested this on my auto before running a run in 2nd gear and one in default 4th gear, hp and torque came out the same.

Putting a stall in will change the numbers though, it will be lower.

 

Someone posted about this quite awhile ago, supposedly he lost somewhere between 5 & 10 hp going from 3.42 to 4.10, I believe. Not really surprising, all that extra spinning will drop your hp down a bit same as bigger rims & tires, but it's how fast the car is that counts, hot the numbers.

 

exactly take it to the track for the best comparison