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Old 03-12-2021, 06:37 PM   #1
JSRTUDOR
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Default 1956 manual trans input shaft

Hi everyone. I have a 56 Mainline with the 3 speed manual trans. and 223 six. I recently dropped in a 272 and put a new clutch kit from Rock Auto on it. Is there any difference between a six cylinder car transmission and the v-8 car transmissions? Specifically the input shaft length and spline diameter? Thanks!
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Old 03-12-2021, 09:39 PM   #2
darrell
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Default Re: 1956 manual trans input shaft

not that i seen.
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Old 03-13-2021, 07:34 AM   #3
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Default Re: 1956 manual trans input shaft

What problems are you having?
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Old 03-13-2021, 03:59 PM   #4
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Default Re: 1956 manual trans input shaft

Installed the engine and it went in too easy, and I have no engagement between the engine and transmission in gear, like the splines aren’t touching the clutch disc. I’m going to pull the engine again and check. I got an original bellhousing and went with an oem clutch kit.
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Old 03-14-2021, 05:57 AM   #5
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Default Re: 1956 manual trans input shaft

Did that 272 possible come from a Ford truck? If you used the truck bell housing, which is about 1” deeper, the car transmission input shaft would probably fail to reach all the way into the clutch hub. Just throwing possibilities out there.
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Old 03-14-2021, 06:25 AM   #6
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Default Re: 1956 manual trans input shaft

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.did you try the clutch on the shaft before you installed it.you dont need to pull the engine to fix this.
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Old 03-14-2021, 06:57 AM   #7
flathead 53
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Default Re: 1956 manual trans input shaft

Mac VP, is correct same thing happened to me , wanted to install A S-10 T-5 in my 53 f-100 , truck bell is about an inch to deep .
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Old 03-14-2021, 07:13 AM   #8
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Default Re: 1956 manual trans input shaft

They might have given you a clutch disk for an older car, 1948 & back, or for pickup, much larger spline hole.
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Old 03-14-2021, 01:06 PM   #9
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Post Re: 1956 manual trans input shaft

If swapping, you would first have to ID the TRANS TYPE and then match a disc to the input shaft and the plate to the flywheel. All same DIA of course.
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As for identifying actual service replacement parts in the MPC, it has to be understood that the cataloging was upgraded every quarter and superscessions/deletions most likely were dropped from text as time progressed and parts became unavailable.

One would need a period correct print date catalog to actually see the correct SERVICE PN as changes may have deleted original an SERVICE PN and showed only service replacement.
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Old 03-14-2021, 02:49 PM   #10
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Default Re: 1956 manual trans input shaft

Well it looks like my kit I got from rock auto has a 1 3/8 spline diameter and my input shaft is a 1". I have found a disc from NAPA that is a 10" disc, 10 spline, 1 1/16 diameter spline, I think it should work, 1/16 shouldn't cause an issue--right?
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Old 03-14-2021, 11:51 PM   #11
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Default Re: 1956 manual trans input shaft

Quote:
Originally Posted by JSRTUDOR View Post
Well it looks like my kit I got from rock auto has a 1 3/8 spline diameter and my input shaft is a 1". I have found a disc from NAPA that is a 10" disc, 10 spline, 1 1/16 diameter spline, I think it should work, 1/16 shouldn't cause an issue--right?
Only if you like watching clutch pieces fall out of the bellhousing
Find the right size replacement parts.
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Old 03-15-2021, 04:28 PM   #12
Alaska Jim
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Default Re: 1956 manual trans input shaft

The splines on the clutch disc must matched the input shaft on the transmission. if you have no luck locating what you need, call Fort Wayne Clutch, Fort Wayne, Ind. , tell them what you have, they can, and will fix you up. https://fortwayneclutch.com/
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Old 03-15-2021, 08:42 PM   #13
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Default Re: 1956 manual trans input shaft

Thanks again everyone! Found one that is the correct size.
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Old 03-16-2021, 03:43 PM   #14
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Post Re: 1956 manual trans input shaft

Here are two charts from the 1949/59 PASS CAR MPC that may be helpful -
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As for identifying actual service replacement parts in the MPC, it has to be understood that the cataloging was upgraded every quarter and superscessions/deletions most likely were dropped from text as time progressed and parts became unavailable.

One would need a period correct print date catalog to actually see the correct SERVICE PN as changes may have deleted original an SERVICE PN and showed only service replacement.
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Old 03-21-2021, 12:51 PM   #15
Lamar Wadsworth
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Default Re: 1956 manual trans input shaft

1 1/16" is not close enough to 1" to work. Your clutch disc should engage the splines and move back and forth effortlessly, but it should not be loose. You shouldn't be able to wiggle it or move it up/down. Always test the disc on the input shaft splines before you put it together. You want effortless back and forth movement on the splines, but no slop.
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