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Old 03-20-2006, 10:24 PM
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why are 55-56-57 rear ends used so often...

..... in old pre war cars like my 40 I've noticed alot of them use 55,56,57 chevy rear ends, why? Easy swap? Any info on this topic will help.

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Old 03-20-2006, 10:38 PM
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Back " in the day " Rodders used everything they could from a DONOR car.....which a lot of the time.....turned out to be a 55, 56 or 57 Chevrolet..usually a 4 door or a wagon. That way the engine, transmission and rear end all " matched " and were sourced as 1 unit. Also on the front....53 - 54 Chevrolet brake drums and hubs BOLTED on....and then the wheels matched all the way around....all 4 had the same wheel pattern.

The rear end is also a good width for the late 30's and early 40's Chevrolets. Strong enough for the engine and it kept the car all GM. The rears are easy to work on and the center section can be easily changed

NOW......the 9 inch Ford is used more......or at least in my area...stronger, more available, and has better parts availability. Especially in the brake parts area.......shoes, drums and the like..... You can build a 9 inch Ford now completely with aftermarket parts........nothing ever been in a Ford plant....even the housing
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Old 03-27-2006, 06:44 PM
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Not trying to thread jack
Duece, what about the rearend for the 58-64 chevy fullsize, are there any swaps for the gears to make them handle some power. i am not going for a ton of power just wanted to see what is out there for those kinds of cars.
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Old 03-27-2006, 07:30 PM
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Quote:
Originally Posted by hotrods316
what about the rearend for the 58-64 chevy fullsize, are there any swaps for the gears to make them handle some power.

The 55 thru 64 Chevrolets all use the same basic stuff.....and will interchange. The fact that everyone of them is over 40 years old, has limited after market support and MOST of the good stuff was tore up at the drag strip years ago........limits their usefulness now.

If you have one....run it....they came behind the 409 motors of the 60's but they are NOT as strong as the later 12 bolts and some of the other more popular rear ends....

Deuce...
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Old 03-27-2006, 07:33 PM
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Guys,

Speaking from experience the number one reason we used these rear ends was because they were easy to find and cheap. Hot Rod engine parts for these years were easy to find. But powertrain parts were harder to find new so you hunted for just the right gear ratio. And back then there wasn't a SummitRacing.com you know.

Scholman
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Old 03-27-2006, 09:39 PM
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Easy to find, cheap, pretty much the right width, and a little brother to the heavier and stronger Olds and Pontiac rears. All of these were desirable because they are Hotchkiss (removable gear carrier) as opposed to the Salisbury with the gear carrier built into the rear end. Much easier to repair/change ratios at the drag strip. The modern Ford 8" and 9" are the reincarnation of these grand old racing parts.
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