rear universal for a 69 charger with 8 3/4 sure grip

[Nathan Barry]

What are all you guys running for a rear universal joint with a 8 3/4 suregrip rear end ? .. I have sheared 2 universal joints on the differential end so far this year. The car is equipped with a 500 stroker running 460 HP and 570 ft/lbs and a 727 auto . I want to get something heavy duty so I dont have to worry about it when I hop on the throttle . I have added pictures of the u joint I was running and the damage , also a pic of the car for ride height

 

[Fran Blacker]

What u-joint are you running 7290 or 7260? Are you running a Spicer joint.

 

[BDF6]

I have Lakewood 7290s w/o the grease fitting and they have held up for a long time with spirited use...
My car doesn't hook though.
Mine sounds similar to your set up:
8 3/4, 3.23, 727 & 550hp/630tq stroker

 

[R413]

Have you altered the ride height or rear suspension? Tells us more about this car. Seems like you have a Pinion angle problem to have this happen twice.

 

[493 Mike]

I went right to 1350 joints on my 493.
Mike

 

[Fran Blacker]

I have Lakewood 7290s w/o the grease fitting and they have held up for a long time with spirited use...
My car doesn't hook though.
Mine sounds similar to your set up:
8 3/4, 3.23, 727 & 550hp/630tq stroker

Is your U-joint the LW chrome Moly? Guy complained on Summit his was made by nepco, a LW vendor. Don't anything about Nepco can't good or bad.

 

[hunt2elk]

I'm running the Spicer 1350's on all my cars. Still use a driveshaft loop for insurance,

 

[MiradaMegaCab]

Ideally it’s a good idea to pull the 727 and inspect the sprag after a driveline failure occurs too....

 

[Nathan Barry]

Have you altered the ride height or rear suspension? Tells us more about this car. Seems like you have a Pinion angle problem to have this happen twice.

Updated post with photo

 

[Nathan Barry]

What u-joint are you running 7290 or 7260? Are you running a Spicer joint.

I’m thinking I want to go with spicer due to a couple bad reviews of the lake wood ones not actually being correct upon arrival , do you have a part number for spicer 7290 as there’s a couple listed

 

[Nathan Barry]

I have Lakewood 7290s w/o the grease fitting and they have held up for a long time with spirited use...
My car doesn't hook though.
Mine sounds similar to your set up:
8 3/4, 3.23, 727 & 550hp/630tq stroker

My car hooks up well . I’m looking to update my engine with aluminum heads , what’s are you running ?

 

[Fran Blacker]

Got this number from Denny's Driveshaft $15 5-811X non-greasable.

 

[Sonny Black]

1-Car body might be sprung out of alignment (or) Possible causes of problems relating to the driveshaft when, the driveshaft rpm will be up and U joint drops the shaft....2- How long the shaft ... 3-The most basic causes of problems in a driveshaft come from the shaft being bent or out of balance.
just a thought.....
Sonnny

 

[BDF6]

My car hooks up well . I’m looking to update my engine with aluminum heads , what’s are you running ?

I have mildly worked ProMaxx heads.
Any aluminum head will most likely help you if you want more power.
Are your numbers at the crank or wheel?
I don't race & don't want to 'hook' = broken parts.
Just a FUN, reliable car.

 

[BDF6]

Is your U-joint the LW chrome Moly? Guy complained on Summit his was made by nepco, a LW vendor. Don't anything about Nepco can't good or bad.

I think they are the CM. I read reviews & got what I hoped were good ones & available. A bit pricey I think, but I like to get as good a part as I can afford.
Buy once-cry once

 

[Cranky]

U-joints with the grease zerks are usually weaker than solid ones. Solid means more steel in the unit itself.

 

[Mick56]

When using a u-joint with a grease zerk, the joint should be installed so the drilled hole is under compression

 

[flyingfarley]

do you have a pinion snubber on the car? The rear axle may be torqueing/twisting up to much under acceleration and breaking the ujoint that way. I have had a couple of 500 inch motors in HP street cars and have never broken a joint...just be sure you have the bigger of the two u-joints mopar used, and get one with out grease fittings.

 

[Nathan Barry]

I have mildly worked ProMaxx heads.
Any aluminum head will most likely help you if you want more power.
Are your numbers at the crank or wheel?
I don't race & don't want to 'hook' = broken parts.
Just a FUN, reliable car.

I have looked into promaxx shocker heads but they are back ordered for months , will most likely go with edelbrock e street heads . my numbers are from the dyno .

 

[Nathan Barry]

do you have a pinion snubber on the car? The rear axle may be torqueing/twisting up to much under acceleration and breaking the ujoint that way. I have had a couple of 500 inch motors in HP street cars and have never broken a joint...just be sure you have the bigger of the two u-joints mopar used, and get one with out grease fittings.

yes i have a pinion snubber on the car , i went ahead and replaced the u joint today with a spicer 7290