lawrencelaramee@gmail.com

i need some help and advice, im putting a 4.2 liter v8 from a s4 2004 and i want to install the engine with is original tranny but the rear diff of my 500 is too weak for that amount of hp and does not have the same ratio than the original final drive of 3.889:1 . i was about to put a rear diff from a usr4 because its bolt on under the car but this diff have a final drive of 4.11:1 . So i wonder what can i do since i dont want to get a 5 speed 01E on this setup event if know that its bolt on on the engine and have the good ratio to match with the usr4 rear diff i want to use. any tip or knowledge will be appreciated and btw sorry for the shytty english im a frenchie from the quebec