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8 3/4 - Yoke u-joint caps help #86051
07/08/08 09:23 PM
07/08/08 09:23 PM
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Indiana
W5Duster436 Offline OP
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So I spent about an hour or so changing the differential in my 8 3/4 housing and noticed when I went to put my u-joint caps on that it seems this particular yoke does not have threads???

Are there two different styles of yokes that take two different types of u-joint caps?

Seems that I have seen some before that were u-shaped and threaded and went through the yoke but the ones I had were just caps with 4 small bolts. It doesn't seem like mine have any marks on the back side of the yoke where nuts have been tightened.. Help!!!

Re: 8 3/4 - Yoke u-joint caps help [Re: W5Duster436] #86052
07/08/08 09:27 PM
07/08/08 09:27 PM
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St. John's Newfoundland
440newport Offline
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Is the yoke drilled all the way through? If there are no threads I would guess somebody drilled it out for for the U bolt style caps. Maybe you could tap the threads for new bolts if there's enough meat there?

Re: 8 3/4 - Yoke u-joint caps help [Re: 440newport] #86053
07/08/08 09:30 PM
07/08/08 09:30 PM
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W5Duster436 Offline OP
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That's all I could figure is that they were drilled but never used yet since there are no marks on the backside of the yoke where the nuts would have gone.

It seems that I recall the caps on my dana being the u-bolt with nuts but I am not sure without going outside to look. I just want to be sure that those will work with an 8 3/4 yoke also. I guess I'll have to go measure from the outside of the cap all the way through to the back.

Re: 8 3/4 - Yoke u-joint caps help [Re: W5Duster436] #86054
07/08/08 09:53 PM
07/08/08 09:53 PM
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W5Duster436 Offline OP
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I went out and measured from the cap to the back of the yoke and it looks to be about 1 7/8" so I would need a u-bolt about 2.125 or so? Anybody have a u-bolt they can measure to check? This is a 489 case with a 7290 yoke? It takes the larger u-joint I believe and seemed to be the exact same yoke as in the 741 I took out but no threads..

4539539-yoke.jpg (46 downloads)
Re: 8 3/4 - Yoke u-joint caps help [Re: W5Duster436] #86055
07/08/08 10:29 PM
07/08/08 10:29 PM
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Pangaea
B5 Bee Offline
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The only yokes I've seen that can take a U-bolt is aftermarket.
Sounds like it has been drilled out for the Moroso cap and bolt kit. That's what you may have to get if you don't want to change yokes.
They look like this, except the ones for the 7290 will be blue,

Last edited by V code '70 Bee; 07/08/08 10:32 PM.
Re: 8 3/4 - Yoke u-joint caps help [Re: B5 Bee] #86056
07/08/08 10:34 PM
07/08/08 10:34 PM
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W5Duster436 Offline OP
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Yeah I looked at my Dana and I cannot for the life of me figure out where I used those u-bolt caps on. I thought it had them but it has the regular strap with bolts.

I can't ever win I tell ya..

Thanks for the info.. I'll see if those give dimensions on moroso's site.

I saw u-bolts on denny's driveshaft site too. I was hoping Cass would see this post and respond..

Re: 8 3/4 - Yoke u-joint caps help [Re: W5Duster436] #86057
07/08/08 10:45 PM
07/08/08 10:45 PM
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Only '66-'67 Dana 60s came with U-bolts, '68-up used the straps. The '66-'67 also used a Spicer 1330 joint instead of the 7290. IIRC, the 1330 caps have a smaller diameter than the 7290, they're about the same as the 7260. The yokes with U-bolt I've had were 5/16", can the 7290 yoke be drilled big enough and not be too thin?

Re: 8 3/4 - Yoke u-joint caps help [Re: B5 Bee] #86058
07/08/08 10:54 PM
07/08/08 10:54 PM
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W5Duster436 Offline OP
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Quote:

Only '66-'67 Dana 60s came with U-bolts, '68-up used the straps. The '66-'67 also used a Spicer 1330 joint instead of the 7290. IIRC, the 1330 caps have a smaller diameter than the 7290, they're about the same as the 7260. The yokes with U-bolt I've had were 5/16", can the 7290 yoke be drilled big enough and not be too thin?




I bet it was my buddy's '67 GTX that had the u-bolts I am thinking about..

No, I think I am probably stuck with either u-bolts or those moroso caps you are referring to. They look pretty good thats for sure. I guess I can call [Email]Tom@RT[/Email] tomorrow and have him give me measurements for the u-bolt type for a 7290 setup. Like my picture said it looks like they'd have to be a little over 2" to work and get the washer and nut on. I was hoping to find out the length of those moroso setups too. Hopefully someone will chime in that knows for sure. I hate to waste another 25 bucks on those morosos if they won't work.

Maybe the Mopar Performance P3690774 would work but for the price it seems the moroso units would hold up better.

Re: 8 3/4 - Yoke u-joint caps help [Re: W5Duster436] #86059
07/09/08 12:36 AM
07/09/08 12:36 AM
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B5 Bee Offline
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The factory U bolt type yoke for a 8.75 rear is '66-'67 only. Used on some or most Hemi automatics and maybe some '67 440 autos. It also uses the Spicer 1330 joint like the '66-'67 Dana. You would have to use that yoke and a 7290/1330 conversion joint. Also the 8.75 yoke is kinda rare and the U bolts from one would not work on the 7290 yoke.
I don't think there's enough meat around the 1/4" hole on the 7290 yoke to drill/tap to use 5/16" bolts (instead of the 1/4") or a 5/16" U-bolt.
Why do you think the Moroso 85820 girdle wouldn't work, it's for the 7290 yoke.

Re: 8 3/4 - Yoke u-joint caps help [Re: B5 Bee] #86060
07/09/08 12:53 AM
07/09/08 12:53 AM
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U.S.S.A.
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i don't think there is a u bolt that will work wit hthat butchered yoke , if it were me i would replace the yoke .

the moroso caps can have issues if you have incorrect pinion angle and the axle winds up too much

Re: 8 3/4 - Yoke u-joint caps help [Re: B5 Bee] #86061
07/09/08 01:25 AM
07/09/08 01:25 AM
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Polson, MT
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Imperial (CV joint type) 8 3/4" yokes can also be used with U-bolts.

Re: 8 3/4 - Yoke u-joint caps help [Re: W5Duster436] #86062
07/09/08 01:25 AM
07/09/08 01:25 AM
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Polson, MT
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If you can post a picture of your yoke, I can identify it.

Re: 8 3/4 - Yoke u-joint caps help [Re: DoctorDiff] #86063
07/09/08 08:36 AM
07/09/08 08:36 AM
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Indiana
W5Duster436 Offline OP
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It is the exact same yoke that was on my original 741 case but just isn't threaded. It is 2 5/8" from the inside of the perches. Which would make it the 7290 style eh? Looks just like this...


4540253-yoke.jpg (59 downloads)
Re: 8 3/4 - Yoke u-joint caps help [Re: DoctorDiff] #86064
07/09/08 08:36 AM
07/09/08 08:36 AM
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Niles , Ohio
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therocks Offline
oh wait.but hey.lets see.oh yeah.
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oh wait.but hey.lets see.oh yeah.
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As DR Diff said Imperial 8 3/4s camr with the u bolts.I have at least 2 from my 69 70 Imps that I scrapped.Rocky


Chrysler Firepower
Re: 8 3/4 - Yoke u-joint caps help [Re: therocks] #86065
07/09/08 09:23 AM
07/09/08 09:23 AM
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Indiana
W5Duster436 Offline OP
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Called Denny's driveshaft and they said to just get the moroso cap kit or just buy bolts/nuts to use with my strap. I guess I'll just get the moroso caps and try them out.


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'70 Dodge W100
Re: 8 3/4 - Yoke u-joint caps help [Re: JohnRR] #86066
07/09/08 09:52 AM
07/09/08 09:52 AM
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Indiana
W5Duster436 Offline OP
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Quote:

i don't think there is a u bolt that will work wit hthat butchered yoke , if it were me i would replace the yoke .

the moroso caps can have issues if you have incorrect pinion angle and the axle winds up too much




John it's all stock diff and nothing has been changed. I probably shouldn't have too many issues as it won't be at the track wheel hopping hopefully.

Re: 8 3/4 - Yoke u-joint caps help [Re: W5Duster436] #86067
07/09/08 10:05 AM
07/09/08 10:05 AM
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Ansonia, CT
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I would use the stock steel straps and go get yourself some good socket head cap screws and nylock nuts.

Lots of bad stories with those alum caps.


2017 Contusion Blue Challenger T/A 392 M6 "BLKNBLU"
Re: 8 3/4 - Yoke u-joint caps help [Re: CJK440] #86068
07/09/08 10:25 AM
07/09/08 10:25 AM
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Slidell, LA
Ronnman Offline
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The past owner of my old 73 Challenger had drilled out the yoke and installed grade 8 capscrews and nylok nuts. Car had a mild 440 and 741 pumpkin. Never had any issues with the rearend. I also recommend using straps and through bolts/nuts.
Ron

Re: 8 3/4 - Yoke u-joint caps help [Re: Ronnman] #86069
07/09/08 10:32 AM
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Indiana
W5Duster436 Offline OP
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I guess this would definitely be the cheaper/easier way to go. I guess I'll have to figure out what size they are. 1/4-28 is fine thread right? I guess 1.5" long would be my guess..

What is the thread size of the original style bolts?

Re: 8 3/4 - Yoke u-joint caps help [Re: W5Duster436] #86070
07/09/08 11:23 AM
07/09/08 11:23 AM
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Ansonia, CT
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The thread won't matter as long as you get the matching nuts.

Do you have a place local that sells bolts, you can just bring the whole deal.


2017 Contusion Blue Challenger T/A 392 M6 "BLKNBLU"
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