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Quick change rear ends

 
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Mack



Joined: 28 Jan 2018
Posts: 731
Location: deep south

PostPosted: Wed Jul 04, 2018 11:57 am    Post subject: Quick change rear ends Reply with quote

Anyone know when local short track guys started using quick change rear ends. I'm working on an early seventies Nashville late model. Wondering what would be correct? Thanks in advance.
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Tom M.
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Joined: 01 Feb 2018
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PostPosted: Wed Jul 04, 2018 1:35 pm    Post subject: Reply with quote

They were running them in the '60s.
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Mack



Joined: 28 Jan 2018
Posts: 731
Location: deep south

PostPosted: Wed Jul 04, 2018 1:53 pm    Post subject: Reply with quote

Thanks Tom. I saw on one of your post a week or so ago on one of your older builds of a local late model sportsman, you had removed the floor pan behind the drivers compartment. Would that be correct for the early seventies late model?
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Last edited by Mack on Thu Jul 05, 2018 6:46 pm; edited 1 time in total
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Tom M.
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PostPosted: Wed Jul 04, 2018 6:21 pm    Post subject: Reply with quote

Generally, yes. Unless a car would also see duty on a longer track they would gut them behind the rear firewall. Not all the cars, but most of them. Especially by the time they started getting them lower, the rear inner wheelwells really limited how low they could get.
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George Andrews



Joined: 30 Jan 2018
Posts: 458

PostPosted: Thu Jul 05, 2018 1:46 am    Post subject: Reply with quote

Tom M. wrote:
They were running them in the '60s.

Quick - Change rear ends have been around since the 1940's at least. They were common on open wheel cars, especially Sprint Cars & Midgets with single - speed transmissions ( basically an in / out box ) and no starter motor. Their use in Stock Cars was limited; NASCAR has never allowed them in the Cup Series though they were legal in the West Series until very recently, and the old NorthWest & SouthWest Tour Series.
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john843



Joined: 28 Jan 2018
Posts: 607
Location: S.C. Lowcountry

PostPosted: Thu Jul 05, 2018 1:42 pm    Post subject: Reply with quote

When we ran the Slim Jim All-Pro series in the early '90s the q/cs were legal. Busch, Cup, and trucks had to run the 9' Ford. I remember looking at Dale Jr.s Late Model at Myrtle Beach Speedway one night and asked one of his crew guys why he wasn't running a q/c and he said his "higher ups" wanted him using what he WOULD be using while pointing out the trailing arm rear that he was running as opposed to some of the more favored options that were legal.

John
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George Andrews



Joined: 30 Jan 2018
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PostPosted: Thu Jul 05, 2018 3:28 pm    Post subject: Reply with quote

Several friends from among the K & N West crews tell me they can change a 9" pumpkin almost as fast as a Q/C; the 9" is also bullet - proof especially on short tracks. I've seen Q/C rears tear apart on the small 3/8ths oval at Roseburg, OR.
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Mack



Joined: 28 Jan 2018
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PostPosted: Thu Jul 05, 2018 3:45 pm    Post subject: Reply with quote

Thanks Tom, and everyone else that's chimed in. Interesting stuff.
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Henryjint



Joined: 28 Jan 2018
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Location: NY State's Hudson Valley

PostPosted: Thu Jul 05, 2018 5:04 pm    Post subject: Reply with quote

While on this subject - Was the quick change type rear in the Monogram NASCAR truck kits correct or incorrect? Since I never really had an AMT truck kit, what type of rear did they have?
Thanks
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Tom M.
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PostPosted: Thu Jul 05, 2018 9:08 pm    Post subject: Reply with quote

The original Craftsman Truck rules allowed either a quick change or a regular floater, if I recall correctly.

As far as quick changes vs. 9" Fords, it's six of one and half a dozen of the other. The 9" is stronger than the spur gears in a quick change but the 9" also runs hotter, sucks up more power through the parasitic losses, and the spare ratios are a lot more expensive than a set of spur gears. A quick change was never designed for 850 horsepower in a 3200 lb. car so they aren't ideal for that kind of use.
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