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So I’m collecting parts to do my junkyard core. Is a 2001 year and has a fixed 2wd output shaft ( halfway splined, has an o ring). I want a full splined output, but I saw some also has a sleeve and o ring inside the sleeve, others don’t. Just trying to educate myself on this. Sleeve needed or not with a sonnax slip yoke.
also, to my understanding, these use the late lube design to lub case bushing and tail housing bushing, therefore no holes in output shaft (my existing shaft also has no holes) some say you need a output with holes in it. I don’t have hollow main shaft to get oil from it for rear lubrication, so what’s the point of having holes in it?
case bushing area has 2 holes at 3 and 6 o’clock one from VB and one goes to tail housing bushing, right? The actual bushing goes in there has no groves to transfer oil around the journal from entrance to exit hole like crank bearings ( none that I’ve seen) I’d like to know how oil will pass to tail housing bushing, if someone knows. Do they internally fed from VB?
thanks.
Dont worry about the output shaft swap, both types are compatible with the trans without any change to function or form. Full splined with no sleeve is what you will def want for the sonnax yoke. You will probably have to touch your endplay up when you swap the shaft as it may change. You current tail and bushing as long as the bushing holes line up with the holes in the tail will have plenty of lube to the extension bushing from the case lube port itself.
*** lube comes from the small black and green orifice plug in the back of the case to tail passage.
97+ units in unmodified cores have output shafts that don't have holes in the output shaft and the main shaft is solid (not hollow)
91-96 units in unmodified cores have output shafts that have the lube holes in the output shaft and the main shaft is hollow.
Chello has an excellent write up on the entire differences between early and late lube circuits here:
Rumor has it that fully splined outputs will result in less vibration than those not fully splined in certain applications.
In my personal vehicle, I went with the fully splined option.
The output shaft that is fully splined for a 97+ slip on yoke style is part 34678RA. Go on ebay now and you can pick one up for $32
I like to use the Sonnax forged chromoly yoke T3-3-5571HP with this style output for performance applications.
You can't go wrong with the fully splined output and sonnax yoke recommended above in your 2001 2wd unit. Ditch the sleeve
If my output wasn't fully splined and instead say it was like the one pictured below, I'd use a Sonnax T3-3-2431CBHP yoke on it.
many thanks. Second picture is what I have (looks like the one you shared), then I bought a used one that looks like the first photo. Seller didn’t provide any part number.just said it has 5” of spline, no hole. Looks ok to me? I read all the posts. Thanks a lot.
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4l80 output shaft 
