Engine swap

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Sep 22, 2015 | 06:13 PM

#16

ultraranger

Lead Driver

Joined: Apr 2011

Posts: 6,399

Likes: 40

From: El Dorado, Arkansas

Quote:

Originally Posted by 72CC428

The Rear gears are 3.73 It loves to drive around 40-55 mph. It really starts howling after 65mph. I mean rpm wise. Does that sound right for the tranny/rear combo?

I wish they had an OD tranny I could drop in that was easy on the wallet.

If the rear end is a Ford 9-inch with a three-seventy anything ratio, it would be a 3.70.
A 3.73 was a Dana (or a modern Ford 8.8") rear end ratio.

Numerically, three isn't a lot of difference between a 3.73 and a 3.70 but, it will make a slight difference in your engine RPMs and any calulations you might make, where the gear ratio will be factored into the calculation.