Originally posted by mustardjohn :
Quote:
Mr. 5.0
Do you just buy the ring and pinion 3.73 gear set and it fits into existing housing or is there more to it? The gear sets sell for about $168 before tax and shipping. Sounds like this might be a very inexpensive mod. Actually less than true dual exhaust kits including installation costs.
How significant is the impact on gas consumption say crusing at 70 mph on interstate?
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The ring and pinion gears can be bought as a kit, with all the necessary hardware for installation. You'll need to replace the speedo gear and the axle oil and I recommend using synthetic gear oil when you do that. Prices vary. Check with a Ford Racing dealer or the Mustang magazine ads for exact pricing. I was guessing as I bought my rear gears some years ago and prices change. Leave the installation to a pro. It's worth the cost.
Going from a 3.27 to a 3.73 final ratio will probably decrease highway gas mileage by a gallon or two, maybe three. RPM's at 70 MPH will increase about 300 to 400. However, the 'seat-of-the-pants dyno' will register a
very noticable improvement, especially at the low-end.