Simple driveshaft question
#1
Mopar Fanatic
Thread Starter
Simple driveshaft question
1970 dodge coronet small block 904 trans,ok almost ready to hit the road, but ran into another snag-go figure. Put new u-joints in my driveshaft before installing it. When I went to put it in the rear u-joint was to skinny like the two little clamps that bolt the back in would barely even grab the caps of the u-joint, I know this is hard without a picture but it isnt the round part of the cap that is to thin its like the length of the cap is to short. the u-joint is the same part number for front and rear is that right or should the rear be different? I did swap rear ends from I think a 8.25, to a 741 8.75 out of a 70 roadrunner. then length looks ok. HELP-I have brand new tires and I hate brand new tires hehehe:driving:
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70Coronet (05-09-2012)
#3
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#4
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I never heard of a conversion u-joint where do you get one and will it hold up to abuse-I have big tires and plan on putting lots of miles on while sitting still
#5
Mopar Lover
Something like this: http://www.dennysdriveshaft.com/p198...reaseable.html
Many manufacturers make them and can be found at common auto supply.
My shop manual says driveshaft exact same length for those two rear ends. Wish I could scan to give a picture of trans linkage.
Many manufacturers make them and can be found at common auto supply.
My shop manual says driveshaft exact same length for those two rear ends. Wish I could scan to give a picture of trans linkage.
Last edited by Coronet 500; 05-02-2012 at 05:04 PM.
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70Coronet (05-02-2012)
#7
Mopar Lover
This should answer: http://www.dennysdriveshaft.com/c88_pinion_yokes.html
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70Coronet (05-02-2012)
#8
If your drive line is all the small u joints (7260) then using a conversion ujoint (7260 to 7290) will not make your driveline any weaker. I've used one before with that same circumstance. I'm not 100% sure but I'm gunna say no the yolk from the 8 1/4 will not work on the 8 3/4. Good luck on your project.
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70Coronet (05-02-2012)
#9
Super Moderator
7260 and 7290 were the common Dodge sizes but now there are aftermarket size yokes availible that allow you to use 1350 size u-joints. That what I run with my 440 Dart. Here's a link that tell you how to measure them. Look at the 1350 size compared to 7260 and 7290.
http://www.driveshaftspecialist.com/...D%20Guide.html
http://www.driveshaftspecialist.com/...D%20Guide.html
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70Coronet (05-03-2012)
#10
Mopar Lover
If it were me, in your situation, I would use the U-Joint that makes your driveshaft work.... and leave the 3rd member alone.
You will be back on the road in under an hour!
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70Coronet (05-03-2012)
#11
Mopar Fanatic
I had the same thing happen to me... Installed a posi 3rd member with the large companion flange and my driveshaft was for the small. I pondered changing the flange and then found out that I was fortunate enough to have a correct driveshaft on hand from the car we took apart.
If it were me, in your situation, I would use the U-Joint that makes your driveshaft work.... and leave the 3rd member alone.
You will be back on the road in under an hour!
If it were me, in your situation, I would use the U-Joint that makes your driveshaft work.... and leave the 3rd member alone.
You will be back on the road in under an hour!
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70Coronet (05-09-2012)
#12
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Thread Starter
Talked to the local o'reilly and advanced auto stores today they both say they are working on it for me but no luck as of so far. Hopefully I can just get one from them vs. ordering one off the internet, gonna be gone for the weekend so if they dont have anything on Monday I will have to look at ordering one online.
#13
Super Moderator
Talked to the local o'reilly and advanced auto stores today they both say they are working on it for me but no luck as of so far. Hopefully I can just get one from them vs. ordering one off the internet, gonna be gone for the weekend so if they dont have anything on Monday I will have to look at ordering one online.
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70Coronet (05-09-2012)
#14
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Thread Starter
well I cheaped out-sure I'm gonna pay for it later, I gave my specs to autozone advance auto and o"rielly and autozone came out on top with a moog ujoint that they stole the caps off another joint to make it work, they damaged the one they took the caps off for mine so the store would get credit and charged me $10.50! it didnt fit perfect I haad to file the inside of the driveshaft lobs down so I could get the clips in but as of right now its in the car-first test drive is tomorrow just have to add diff fluid and check everything over and its ready to go!
#16
Mopar Lover
Sorry this might be to late, I just picked one up for my truck. I gave the parts person a Dana Spicer 5-527X number he crossed to an AC Delco 45U0169 number, fits perfect. Don't listen to them when they say it won't fit a Dodge.
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70Coronet (05-18-2012)
#17
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Thread Starter
I put about 100 miles on it so far and wow am I having a hard time with being nice to the new motor, it revs extremly fast with the stall and the 3:91 gears, jumped on it twice for about a second and the 295/45/18's didnt stand a chance instantly sideways
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70Coronet (05-18-2012)
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