Rear Driveshaft U-Joints

BeepBeepJeepJeep · **Posted:** Fri Mar 20, 2009 11:22 am

My ujoints are on their way out so I'm looking to get the beefier ones from NAPA, but they're asking me what size my yolk is... I have no idea (is it really any of their business? :lol:

)

Anyway, how would I find out? My options are 3.5" or 4"

Thanks.

jeepkj02 · **Posted:** Fri Mar 20, 2009 1:47 pm

4" yoke. That is what I used in my 2002 sport 4x4 auto 45rfe.

CRDMiller · **Posted:** Fri Mar 20, 2009 3:22 pm

Do yourself a favor and don't use greasable joints (Hollow body)

The dana solid cross (similar to what came on the liberty) Is one of the better out there.

BeepBeepJeepJeep · **Posted:** Fri Mar 20, 2009 3:27 pm

jeepkj02 wrote:

4" yoke. That is what I used in my 2002 sport 4x4 auto 45rfe.

Thanks. I already ordered both the 3.5" and the 4" and will take back whichever I don't need. I will report back to let you guys know!

Oh and, I've already had poor experience with greasable joints. Non-greasable all the way!!!

ShafferNY · **Joined:** Wed Dec 26, 2007 3:51 pm **Posts:** 88

I always buy the greasable ones. Never had problem.

You do have to install them correctly for strength though.

Guest · **Posted:** Fri Mar 20, 2009 6:42 pm

Uh

Totally confused as to what problems people have out of greasable U-joints

Jeepjeepster · **Posted:** Fri Mar 20, 2009 7:15 pm

ThunderbirdJunkie wrote:

Uh

Totally confused as to what problems people have out of greasable U-joints

x2. Why dont we all go buy sealed ball joints as well. :lol:

Guest · **Posted:** Fri Mar 20, 2009 9:58 pm

Screw it.

When ThunderbirdJunkie needs balljoints next

He is just going to run a big bolt from the LCA to the knuckle, eliminating the need for said balljoint!

tjkj2002 · **Posted:** Fri Mar 20, 2009 10:07 pm

The rear driveshaft uses 1310 u-joints.

JeepinJarhead03 · **Posted:** Fri Mar 20, 2009 10:30 pm

high-torque / high driveline shock applications will fail greasables 4 to 1 in comparason to solids

I used to snap them right across where the grease fittin went in

i don't think i'd worry an awful much about greasables in our KJ's

run whatever makes ya sleep good at night

tjkj2002 · **Posted:** Fri Mar 20, 2009 10:36 pm

JeepinJarhead03 wrote:

high-torque / high driveline shock applications will fail greasables 4 to 1 in comparason to solids

I used to snap them right across where the grease fittin went in

i don't think i'd worry an awful much about greasables in our KJ's

run whatever makes ya sleep good at night

If your breaking 1310 u-joints,greaseable or not,in a KJ you shouldn't be where you were :wink:

.Every high torque app I have seen uses greaseable u-joints,granted the u-joints are 10 times the size as the KJ's 1310's.

03CDKJ · **Posted:** Fri Mar 20, 2009 10:40 pm

Hey troy... Will these U joints fit?

http://store.summitracing.com/partdetai ... toview=sku

Guest · **Posted:** Fri Mar 20, 2009 10:57 pm

Those are the exact ones ThunderbirdJunkie has in his KJ

JeepinJarhead03 · **Posted:** Fri Mar 20, 2009 11:09 pm

they didnt make greasable ujoints for my cheyenne that were big enough for me not to break them.. guess i coulda changed yokes and dshafts and used a light dumptruck ujoint

because i broke the solid ones frequently too just nowhere near as frequently as the greasables

my T/A would break a greasable every now and then too

but you're right, in a KJ shouldn't be breakin either one

like i said, don't see why the greasers won't work just fine

guess im kinda comparing apples to oranges here

but the solids let me sleep at night

but yeah, 10-50 lb ujoints are greasable because they usually require removing a 100 lb driveshaft while your head is squeezed between the rear tires of a dump truck to remove them

i just meant with typical passenger apps

pg2676 · **Posted:** Tue Mar 24, 2009 1:00 am

I see there are two choices for u-joints for the rear. Neapco #'s 1-0153 and 2-0048. What size outside lock up is on my 03 KJ V6? Anybody use the Neapco Brute Force series?
How big a job is it to change the rear shaft joints in the driveway?

tjkoen01 · **Posted:** Tue Mar 24, 2009 12:16 pm

i just changed my u joints a couple months ago. these u joints have the grease fitting* on the cap so there is no stress riser on the cross...i'd imagine that they are just as strong non-greaseable ones.

* they are not the typical zerk fitting we are all used to. these require a needle type adapter to get the grease in. messy but effective.

pg2676 · **Posted:** Tue Mar 24, 2009 4:02 pm

tjkoen01 wrote:

i just changed my u joints a couple months ago. these u joints have the grease fitting* on the cap so there is no stress riser on the cross...i'd imagine that they are just as strong non-greaseable ones.

* they are not the typical zerk fitting we are all used to. these require a needle type adapter to get the grease in. messy but effective.

Brand?
Part Number?

tjkoen01 · **Posted:** Tue Mar 24, 2009 8:40 pm

pg2676 wrote:

tjkoen01 wrote:

i just changed my u joints a couple months ago. these u joints have the grease fitting* on the cap so there is no stress riser on the cross...i'd imagine that they are just as strong non-greaseable ones.

* they are not the typical zerk fitting we are all used to. these require a needle type adapter to get the grease in. messy but effective.

Brand?
Part Number?

i've slept since then! i bought the u joints from o'reilly's...It was either a p/n 270 or 280, whichever is for the 4 inch yoke....i want to say it was the 270.

pg2676 · **Posted:** Tue Mar 24, 2009 10:22 pm

tjkoen01 wrote:

pg2676 wrote:

tjkoen01 wrote:

i just changed my u joints a couple months ago. these u joints have the grease fitting* on the cap so there is no stress riser on the cross...i'd imagine that they are just as strong non-greaseable ones.

* they are not the typical zerk fitting we are all used to. these require a needle type adapter to get the grease in. messy but effective.

Brand?
Part Number?

i've slept since then! i bought the u joints from o'reilly's...It was either a p/n 270 or 280, whichever is for the 4 inch yoke....i want to say it was the 270.

Thats a Precision P/N. I checked the O'Reilly's web site and it wasnt very helpful in the selection. I guess I'll have to get under it unless someone knows which joint is for the 3.73 rear.

Rear Driveshaft U-Joints

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