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Dec 26, 2009, 10:02pm

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Topic: Rear driveshaft question (Read 144 times)

Doug
Administrator

Flat Fender
member is offline

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1953 CJ3A - Saber Rouge

Joined: Nov 2006
Gender: Male

Posts: 1,053
Location: Bradenton, Florida

Re: Rear driveshaft question
« Result #1 Today at 10:12am »

Thanks for the updated diagram.

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Happy Jeep Trails, Doug.

www.flatfenderfever.com

Result 2 of 10:

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Topic: Looking for Seat Springs (Read 67 times)

maxwell
Cherokee

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Joined: Nov 2007
Gender: Male

Posts: 32

Re: Looking for Seat Springs
« Result #2 Today at 6:13am »

My son figured out what PM meant, and I found two messages - one new and one almost a year old. I always wondered what that top banner meant about 1 message waiting. I may be old, but I am learning. However, not very fast.

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Topic: Rear driveshaft question (Read 144 times)

oldtime
Commanche

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Joined: Mar 2009
Posts: 13

Re: Rear driveshaft question
« Result #3 Today at 1:55am »

That's a great bit of information Rocketeer.
Thanks for posting the correct rear measuring.
I don't imajine anyone could have fgured that out very easily.
It makes perfect sense to me now that you mention it.

I have noticed that some rear propeller shafts have a longer flange yoke than do some others.
The slightly longer rear flange yokes are mated to the propeller shafts having slightly shorter splined yokes.

This should help explain why so many rear propeller shaft lengths were used.
I suspect that various rear flange yokes were used to optimize the propeller shaft OA length.
I believe that the rear flange yokes were supplied in specific lengths to provide the optimum effect upon the rear propeller shaft angle.

From my observations the shortest feasablable rear flange yoke was always used.
This allows the rear propeller to be at its longest possible length while not binding at the universal.
In other words if the rear flange yoke were extendeed back too far, the propeller shaft is shortened and the angle is more acute.
If the rear flange yoke is too short then the u-joint binds when the rear axle goes into full droop.
A longer rear flange yoke is always used for a shorter OA propeller length.
Clear as mud ?

« Last Edit: Today at 2:52am by oldtime »

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Topic: Rear driveshaft question (Read 144 times)

rocketeer
Flatfender

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Joined: Jul 2005
Gender: Male

Posts: 520
Location: Lehighton, PA

Re: Rear driveshaft question
« Result #4 Yesterday at 9:21pm »

Suspicions confirmed. Someone sent me a copy of the blueprints (Thanks Wes) for the M38 driveshafts. While there are some technical differences the M38 is essentially a CJ3A and the driveshafts are interchangeable. What the blueprints show is that the front driveshaft is, in fact, measured from ctr of u-joint to ctr of u-joint and is accurate at 22 31/32".

However, the blueprint for the rear driveshaft does show a different method of measuring. On the blueprint the rear driveshaft is measured from the ctr of the rear u-joint to the front edge of the front flange, not the ctr of the u-joint. Nice of Willys to leave that little bit of info out of the manuals.

So now you know the correct way to measure your driveshafts when trying to determine what is correct for your vehicle.

FRONT - ctr of u-joint to ctr of u-joint
REAR - ctr of rear u-joint to front edge of forward flange

Here's a corrected diagram. It's a jpg image and can be saved for reference.

[image]

Larry

« Last Edit: Today at 7:56am by rocketeer »

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13th AAF of WWII Webmaster
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Result 5 of 10:

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Topic: Merry Christmas! (Read 61 times)

gqwillys
Commanche

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Joined: May 2008
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Posts: 24

Re: Merry Christmas!
« Result #5 Yesterday at 3:23pm »

Merry Christmas everyone. Hope all of you have a safe and happy holiday season.

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Topic: Radiator (Read 346 times)

rocketeer
Flatfender

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Joined: Jul 2005
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Posts: 520
Location: Lehighton, PA

Re: Radiator
« Result #6 Yesterday at 12:00pm »

Merry Christmas!!

Larry

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13th AAF of WWII Webmaster
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Result 7 of 10:

Author

Topic: Looking for Seat Springs (Read 67 times)

49cj3a
Cherokee

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Joined: Mar 2007
Gender: Male

Posts: 34
Location: Hartsville, SC

Re: Looking for Seat Springs
« Result #7 Yesterday at 11:19am »

Maxwell,
Email sent.
Jack

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49CJ3A
51M38

Result 8 of 10:

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Topic: Radiator (Read 346 times)

bwilkes
Scrambler

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Old skool. That's how we roll!

Joined: Aug 2008
Gender: Male

Posts: 73
Location: just north of Memphis, TN

Re: Radiator
« Result #8 Yesterday at 11:02am »

Got a new radiator for Christmas and the Willys is alive once again! Thanks for the info everybody (especially the PM's, rocketeer). There was the predicted clearance isssue at the bottom, fixed with a couple extra washers as spacers for the moment.

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I am bjw's girlfriend, and have taken over his forgotten screenname
Olive Drab '52 CJ3a.
pics HERE
What you talkin' 'bout, Willys?

Result 9 of 10:

Author

Topic: Looking for Seat Springs (Read 67 times)

rocketeer
Flatfender

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Joined: Jul 2005
Gender: Male

Posts: 520
Location: Lehighton, PA

Re: Looking for Seat Springs
« Result #9 Yesterday at 10:45am »

Yesterday at 7:10am, maxwell wrote:

Don't understand the message "PM sent".

It means "Private Message". If you look at the top banner off to the right you will see a message like the one below. Click on it to get to them.

"Hey, rocketeer, you have 3 messages, 0 are new.
Dec 25, 2009, 10:42am "

Larry

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