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Jeff Smith’s Blog

How GM Influenced Ford
Posted April 13 2009 06:00 AM by CarCraft 
Filed under: Editorials

No Subject

Copycat Engineering


In a previous blog, I talked about how the LS-series engines could be viewed as later-model versions of the original small-block Ford with the various similarities between the engine designs. It occurred to me that this corporate copying didn’t stop there and frankly goes back much further. I remember not too long ago working on a Ford 8.8 rear axle with my buddy Tim Moore when we noticed that that pinion shaft diameter on an 8.8 is exactly the same as the Chevy 12-bolt. In fact, the two rear axle assemblies use the exact same pinion bearings. The part numbers are exactly the same. Close still, the GM 12-bolt ring gear is 8.625 inches in diameter while the Ford is 8.80 inches. The main place where they are different is the GM 12-bolt uses 30-spline axles while the Ford originally was 28 and later became larger. Plus, the Fox body car uses a rear coil spring suspension that looks very much like a Ford version of the ’64 to ’72 Chevelle four-link rear suspension. Coincidence? Probably not, but does it really matter? It’s just interesting to see how the manufacturers pay attention to what works. If it’s a good idea, they’ll use it, and we car crafters benefit from that.


also , since i helped you out maybe you could help me out by letting me know where a good place to stay for the summer nats is to see all the action after the show at night?


hey, just wanted to let you know that the 12 bolt has a 8.875 diameter ring gear, not a 8.625

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