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904 & 8 3/4. What u-joints to use? #1144123
12/25/11 10:48 PM
12/25/11 10:48 PM
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Tri-Cities, Washington
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VITC_GTX Offline OP
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Putting together a small block race car for next summer. The car will use slicks but will only get down to the mid/low 12's. I have a 904 and a 741 8 3/4 with small yoke that I will be using. I was thinking I will need to change the yolk out on the 741 to the 7290. How about the tranny yolk? Are the 727 and 904 yolks the same (diameter/splines)? If not, were there stock 904s with the 7290 u joint?

Re: 904 & 8 3/4. What u-joints to use? [Re: VITC_GTX] #1144124
12/25/11 11:09 PM
12/25/11 11:09 PM
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Florida
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no,904 has a different spline slip yoke than a 727/833/833OD

yes 904 has a 7290 u-joint slip yoke,find them in vans and trucks mostly,from the ones I have run across.

i would think the small 7260 joints will hold up if you use a good joint that has a solid cross and not the hollow ones that get greesed.

i run 7260 in about everything,i allways go to napa for a spicer super joint with the non-greeseable solid cross.

I have a 7260/1330 conversion u-joint on my 742 8 3/4 which I hammer hard and no toruble from it either.

granted not running high HP or 12 sec passes,but abuse the he77 out of them on the street from power brakeing to N drops at 5000 rpm

I go thru more trans than u-joints though

Re: 904 & 8 3/4. What u-joints to use? [Re: VITC_GTX] #1144125
12/25/11 11:12 PM
12/25/11 11:12 PM
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Romeo MI
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A 904 uses a 26 spline and a 727 uses a 29 spline...
weight of the car will make the big difference BUT
you would most likely be better off with the 7290 joint

Re: 904 & 8 3/4. What u-joints to use? [Re: MR_P_BODY] #1144126
12/25/11 11:29 PM
12/25/11 11:29 PM
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Tri-Cities, Washington
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VITC_GTX Offline OP
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Quote:

A 904 uses a 26 spline and a 727 uses a 29 spline...
weight of the car will make the big difference BUT
you would most likely be better off with the 7290 joint





The car is a '69 Barracuda notchback with fiberglass front end. Guessing 3100 lbs-ish

I think I will plan for the 7290 u joints. I will head to the junkyard and get a 904 and 8 3/4 yokes for the 7290. May be hard to get the 8 3/4 yoke off at the junkyard though! I can't get the pinion nut off my 70 Sport Satellite 8 3/4 while its in the car.

Last edited by VITC_GTX; 12/25/11 11:30 PM.
Re: 904 & 8 3/4. What u-joints to use? [Re: scratchnfotraction] #1144127
12/25/11 11:47 PM
12/25/11 11:47 PM
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Lincoln Nebraska
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RapidRobert Offline
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Quote:

i would think the small 7260 joints will hold up if you use a good joint that has a solid cross and not the hollow ones that get greesed.
i allways go to napa for a spicer super joint with the non-greeseable solid cross.


X2. Grease em then install and make SURE it's free in both planes in the front and 1 plane in the rear & after the install set the shaft flat on the bench but slightly supported along it's length so with the ujoint caps slightly up off the ground with the ears are at 12 o'clock and 6 o'clock whack the top ear (piece between the shaft and the round cap) solidly with a medium hammer several times then turn it over so the other ear is at 12 o'clock & whack it too then move it back & forth & see if it's totally free. Check it before/after & you'll see the difference. Bang it again if need be. If not free it will not last EDIT use the rounded pein side of the hammer head and do not hit the shaft or the cap and if you are unsure of your accuracy have a helper hold the shaft & you use the hammer and a brass drift

Last edited by RapidRobert; 12/26/11 10:00 AM.

live every 24 hour block of time like it's your last day on earth
Re: 904 & 8 3/4. What u-joints to use? [Re: RapidRobert] #1144128
12/26/11 12:21 AM
12/26/11 12:21 AM
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las vegas
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Got a 71 Dart with 360 that has run 10.99 in Vegas with a trans brake. Using the 7260 u-joints on both ends of driveshaft going on 5 yrs now.


Tony

70 AARCuda Vitamin C
71 Dart Swinger 360 10.318 @ 128.22(10-04-14 Bakersfield)
71 Demon 360 10.666 @122.41 (01-29-17 @ Las Vegas)
71 Duster 408 (10.29 @ 127.86 3/16/19 Las Vegas)
Re: 904 & 8 3/4. What u-joints to use? [Re: VITC_GTX] #1144129
12/26/11 12:43 AM
12/26/11 12:43 AM
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Blair County,PA
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Quote:

Quote:

A 904 uses a 26 spline and a 727 uses a 29 spline...
weight of the car will make the big difference BUT
you would most likely be better off with the 7290 joint





The car is a '69 Barracuda notchback with fiberglass front end. Guessing 3100 lbs-ish

I think I will plan for the 7290 u joints. I will head to the junkyard and get a 904 and 8 3/4 yokes for the 7290. May be hard to get the 8 3/4 yoke off at the junkyard though! I can't get the pinion nut off my 70 Sport Satellite 8 3/4 while its in the car.





I don't think you will find a 904 yoke that will take a 7290 u joint!

Re: 904 & 8 3/4. What u-joints to use? [Re: 62maxwgn] #1144130
12/26/11 01:23 AM
12/26/11 01:23 AM
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Florida
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scratchnfotraction Offline
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Florida
Quote:

Quote:

Quote:

A 904 uses a 26 spline and a 727 uses a 29 spline...
weight of the car will make the big difference BUT
you would most likely be better off with the 7290 joint





The car is a '69 Barracuda notchback with fiberglass front end. Guessing 3100 lbs-ish

I think I will plan for the 7290 u joints. I will head to the junkyard and get a 904 and 8 3/4 yokes for the 7290. May be hard to get the 8 3/4 yoke off at the junkyard though! I can't get the pinion nut off my 70 Sport Satellite 8 3/4 while its in the car.





I don't think you will find a 904 yoke that will take a 7290 u joint!




I just gave a 94 van 904 yoke to a member and sent the drive shaft to member stumpy,it was from a van and had a 7290 on both ends.

they are out there,should be able to buy new as well from a drive shaft shop ect...

Re: 904 & 8 3/4. What u-joints to use? [Re: scratchnfotraction] #1144131
12/26/11 01:36 AM
12/26/11 01:36 AM
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Tri-Cities, Washington
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VITC_GTX Offline OP
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I was able to find new 904/7290 yokes for $39 on-line.

Using 7260 u joints would be great since I already have what I need but I'm nervious about using them.

Re: 904 & 8 3/4. What u-joints to use? [Re: VITC_GTX] #1144132
12/26/11 01:41 AM
12/26/11 01:41 AM
Joined: Jan 2003
Posts: 20,149
Park Forest, IL
slantzilla Offline
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Park Forest, IL
Quote:

I was able to find new 904/7290 yokes for $39 on-line.

Using 7260 u joints would be great since I already have what I need but I'm nervious about using them.




I have gone as fast as 12.0's with 7260 u-joints in my Valiant that aren't even solid cross or heavy duty.

My buddy Mike Jeffrey went 10.0's in his Valiant leaving off a brake all the time with solid cross 7260's.

They are a lot tougher than most people think.


"Everybody funny, now you funny too."
Re: 904 & 8 3/4. What u-joints to use? [Re: VITC_GTX] #1144133
12/26/11 02:02 AM
12/26/11 02:02 AM
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Bend,OR USA
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Cab_Burge Offline
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Bend,OR USA
Quote:

I was able to find new 904/7290 yokes for $39 on-line.

Using 7260 u joints would be great since I already have what I need but I'm nervious about using them.


I have used the 7260 U joints, HD with solid cross shafts, not the standard duty passenger car greaseables ones in the rear on my Duster It went 10.34 at 128 MPH weighing 3450 lbs with me in it before I twisted the 8 3/4 housing up bad enough to break the ladder bar brackest off of it I did break the stock front 7290 U joint trans yoke and then it spread a new Dana stock cast steel piniion yoke far enough apart to let the locking snap ring on the rear Ujoint to come out I ended up buying a new Yukon billet steel 7260 rear pinion yoke from Randys Ring and Pinion after that and never had those problems again, until the housing gave up All the 1963 Max Wedge cars came with 7260 in them, at least all the ones I saw and raced did Make sure and only buy the H.D. solid cross shaft four wheel drive ones


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: 904 & 8 3/4. What u-joints to use? [Re: Cab_Burge] #1144134
12/26/11 09:04 AM
12/26/11 09:04 AM
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Posts: 25,200
Upper Midwest
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Upper Midwest
I ran mid 11's and 1.55 60 foot times for many years with 7260 joints and never had a problem. Never did go to the larger joint. Sold the car with them in it. Kept them well serviced every spring.







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