One thing is for sure; You should be able to get an accurate whp/tq with 4.08’s...as it won’t over speed the Dyno in 5th gear (1:1)
Your 4th is 1.27:1 & an auto is 1.41:1,
Some tuners avoid 1:1 in these cars because of the higher speed @7500+ R’s
Good Luck & post some #’s ... as 5th will yield higher ones than 4th gear,
And don’t be surprised if your #’s Dropoff a tad; because it’s easier for the engine to turn 4.08’s vs. 3.69 or 3.36’s
|