79 CJ7 Rear Driveshaft length - JeepForum.com
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post #1 of 18 Old 03-17-2020, 07:53 PM Thread Starter
Allegan11
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79 CJ7 Rear Driveshaft length

Hopefully this will be quick. I have a 79 Cj7 with an original 304 V8, Dana 20 Transfer, T150 3 speed. Stock axle AMC 20 in the rear. All of these things came separated from each other and without a rear drive shaft. Does anyone here have this configuration that can give me a measurement of the stock rear driveshaft? or at least point me to a thread where this is discussed?


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post #2 of 18 Old 03-18-2020, 12:12 PM
EricRThompson
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My '79 had the same setup but I swapped out the 304 for a 401 and have a T176 with D300 now so don't need the drive shafts. If you want em, let me know. My zip: 18914.
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post #3 of 18 Old 03-19-2020, 12:50 AM
80cj
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You can just measure the distance between yoke faces and have a new shaft made up.
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post #4 of 18 Old 03-19-2020, 09:51 AM Thread Starter
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Great. first question is how long (compressed) is each drive shaft? Second, how much for each shaft? Shipping will be expensive I'm guessing.

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post #5 of 18 Old 03-19-2020, 09:53 AM Thread Starter
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I find that the value of the CJ7 or 5 for that matter goes down depending on how much modifications are made to it. The more authentic and OEM, the more it's worth. Plus, a custom drive shaft is going to be upwards of $400 or more.

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post #6 of 18 Old 03-19-2020, 10:05 AM
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Quote:
Originally Posted by Allegan11 View Post
I find that the value of the CJ7 or 5 for that matter goes down depending on how much modifications are made to it. The more authentic and OEM, the more it's worth. Plus, a custom drive shaft is going to be upwards of $400 or more.
Probably less since this will be a shaft with regular U joints.
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post #7 of 18 Old 03-19-2020, 12:34 PM
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Quadratec has what you want built by Tom Woods
https://www.quadratec.com/products/5...m#&gid=1&pid=1
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post #8 of 18 Old 03-19-2020, 01:24 PM
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Driveshafts

You should check out this guy on eBay. I bought both of my driveshafts from him for my CJ7. $150 for the front and $130 for the rear. Guaranteed not to break. Read his ad. I'm very satisfied with the product.

Regards,
John

https://www.ebay.com/itm/NEW-1310-JE...4AAMXQROxRe0ZC
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post #9 of 18 Old 03-20-2020, 11:15 AM Thread Starter
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So I take it, no one actually knows the measurements of these drive shafts?

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post #10 of 18 Old 03-20-2020, 01:24 PM
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Originally Posted by Allegan11 View Post
So I take it, no one actually knows the measurements of these drive shafts?
Why don't you measure the distance between yoke faces. That would be the running length. Collapsed length would be say 1 1/2" shorter and extended length that much longer.

Also, I sent you a link to Quadrates website where they list a shaft for your application. If it doesn't fit, send it back.
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post #11 of 18 Old 03-21-2020, 09:19 AM
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Meausure what you have! There are shops all over the country that build driveshafts, so find a local shop or one of the many that you can find online that will ship anywhere. Any competent builder can take the measurement you get with it sitting at ride height and determine how long each of the components need to be as well as fully compressed/fully extended length.

With all of the truck traffic that goes through Cincinnati I'm sure there's at least one shop there that could build you something.
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post #12 of 18 Old 03-21-2020, 04:50 PM Thread Starter
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CSP - I you read the initial post, it says that I don't have them and that all of the transmission components are separated from each other. I have no way of measuring, but thank you for your well informed response. Besides, the reason I want the measurements is so that I can get an OEM drive shaft from someone in my area but can't because I don't know what to look for.

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post #13 of 18 Old 03-21-2020, 05:02 PM Thread Starter
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80cj - I can't measure between the yokes because all of the drive components are separated from each other. None of them are connected to the Jeep right now. Plus it didn't come with a front or rear drive shaft. I can get a used drive shaft (front and rear) for $40 a piece and they are OEM. I just need to know how long they are before I grab one off of FB marketplace.

CSP - My response should answer why I can't do what you think I should do.

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post #14 of 18 Old 03-21-2020, 05:37 PM
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Quote:
Originally Posted by Allegan11 View Post
80cj - I can't measure between the yokes because all of the drive components are separated from each other. None of them are connected to the Jeep right now. Plus it didn't come with a front or rear drive shaft. I can get a used drive shaft (front and rear) for $40 a piece and they are OEM. I just need to know how long they are before I grab one off of FB marketplace.

CSP - My response should answer why I can't do what you think I should do.
Then perhaps you should assemble the transmission/transfercase then measure for the drive shaft. At least in my thinking that is the order in which things should be done. Or maybe you can make an agreement with the person who is selling those shafts that you have an option to return if they don't fit. FWIW.
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post #15 of 18 Old 03-21-2020, 08:04 PM
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Lots of stuff can influence the length of the shafts. Change in axel, change in transmission, motor mount location if something was swapped, lift. Your best bet is to assemble the Jeep like you would have to anyhow and then measure and then purchase. If something is a little different than factory, you will be happy you did it in the correct order.
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