72 dart driveshaft

[cudabob]

I am converting my 72 dart to a 8-3/4 rear end.The car has a 360 with a 904 transmission.I have measured it up and a 48-1/2 driveshaft would be the right size.The online chart back this measurement up as well 48.60.I have a contact that has a 68 dart gt and 340/904/8-3/4 and he has a shaft for the car but it's 49 3/8 long....I don't understand how it could be different?

 

[RAT ROD AL]

How are you measuring it ?
Whats your measuring points ?
I have a few different one I could compare.

 

[RedFish]

If you are measuring where there isn't a shaft,, rear axle at ride position or hanging down will make some difference. 3/4 inch difference seems about right. There was a drive shaft length chart shared here long ago. Good luck

 

[Professor Fate]

Yep, as stated your measurement will vary depending on if you're measuring U joint center-to-center or overall length, or whatever... And whether you're measuring with the suspension loaded or not.

 

[cudabob]

I have done some measuring and realized that I don't have a 904 I have a 727...I feel stupid

 

[cudabob]

Ok.so with the jackstands under the rear axel it looks to be about 48.5 inches center to center....with the jackstands under the frame it looks like 49 inches center to center

 

[RedFish]

I have done some measuring and realized that I don't have a 904 I have a 727...I feel stupid

It happens.
I can nolonger trust my memory so others can't either but,,,
First 67 fish was slant 6 904, 7&1/4 rear. Donor was Tradesman 200, 318, 727. Drive shaft from that donor was like 3 inch dia. I want to say I had it cut to 49&1/2 to fit.
6 or 7 years later the 727 came out, 904 went in. Back to the small tube driveshaft from a parts yard. Don't know that I ever measured it's length. Anyway,,, shortly after I found this website a owner needed a shaft for 904 to 8 &3/4 rear. I had the 49&1/2 length he needed laying here.

 

[1500swinger]

I have a driveshaft from my 70 dart 340, 727 and 8 3/4 that Is factory. I can give you the measurement from center of u joint cap hole to same at other end as it is sitting on my bench atm.

 

[cudabob]

I have a driveshaft from my 70 dart 340, 727 and 8 3/4 that Is factory. I can give you the measurement from center of u joint cap hole to same at other end as it is sitting on my bench atm.

That would be great

 

[1500swinger]

Give me an hour or so to get to the shop.

 

[1500swinger]

Here are 2 1970 dart 340 driveshafts. The green one is a 4spd and measures 52" center of u joint cap to center of u joint cap. The other is for a 727 and measures 48" center of cap to center of cap. Both cars are 8 3/4 rearends.

 

[cudabob]

48 is about what I measured.....looks like that is what I need....thanks a lot

 

[RAT ROD AL]

Did you find yourself a driveshaft ?