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Mack
Joined: 28 Jan 2018 Posts: 731 Location: deep south
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Posted: Wed Jul 04, 2018 11:57 am Post subject: Quick change rear ends |
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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. _________________ life is hard, it's harder when you're stupid. John Wayne |
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Tom M. Board Moderator
Joined: 01 Feb 2018 Posts: 602
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Posted: Wed Jul 04, 2018 1:35 pm Post subject: |
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They were running them in the '60s. |
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Mack
Joined: 28 Jan 2018 Posts: 731 Location: deep south
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Posted: Wed Jul 04, 2018 1:53 pm Post subject: |
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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? _________________ life is hard, it's harder when you're stupid. John Wayne
Last edited by Mack on Thu Jul 05, 2018 6:46 pm; edited 1 time in total |
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Tom M. Board Moderator
Joined: 01 Feb 2018 Posts: 602
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Posted: Wed Jul 04, 2018 6:21 pm Post subject: |
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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: 459
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Posted: Thu Jul 05, 2018 1:46 am Post subject: |
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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
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Posted: Thu Jul 05, 2018 1:42 pm Post subject: |
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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 Posts: 459
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Posted: Thu Jul 05, 2018 3:28 pm Post subject: |
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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 Posts: 731 Location: deep south
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Posted: Thu Jul 05, 2018 3:45 pm Post subject: |
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Thanks Tom, and everyone else that's chimed in. Interesting stuff. _________________ life is hard, it's harder when you're stupid. John Wayne |
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Henryjint
Joined: 28 Jan 2018 Posts: 1967 Location: NY State's Hudson Valley
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Posted: Thu Jul 05, 2018 5:04 pm Post subject: |
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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 _________________ Forum member since 10/25/2010 |
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Tom M. Board Moderator
Joined: 01 Feb 2018 Posts: 602
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Posted: Thu Jul 05, 2018 9:08 pm Post subject: |
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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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