Re: rear u joint
Posted by John Payne On 2013/8/20 2:50:20
G'day Men, it's taken awhile but the mod's are now complete and the driveshaft is now ready for reinstallation. Just to recap, I bought a replacement Spicer diff yoke (# 3-4-2111-1) and strap kit (# 3-70-28X), which I understand are Jeep parts. The reason for this selection is that the inner, outer and length dimensions of the yoke shaft are the same as the original, which means the seal fitted previously is the correct size. The uni joint is a readily available non-greasable Spicer 1350 series. I was told that this is actually more heavy duty than the original, which is rated about 1330 series.
I had the front ball and trunnion serviced at the same time and was told that the grease was pretty old but the joint itself was in good condition, although wear was evident where the trunnion spends most of its time. When the driveshaft specialist was modifying the driveshaft to take the new uni joint, he also lengthened it so that the trunnion now will spend most of its time about 3/8" further forward. In other words, where there is no wear at all. He then balanced it all but found a slight bend in the driveshaft which he straightened. He reckons it will now "see me out".
I've attached some pic's so you can see what I've been rabbiting on about. The new yoke looks a lot bigger than the old, and physically it is, but the shaft is the same. The slinger fitted to the new yoke actually came off the old one as it isn't supplied with one. It seems I made a mistake in removing the old yoke from the pinion as I should have marked where the pinion nut was and counted the number of turns to remove it. As it happens, I needed an air gun to undo it so I couldn't count 'em anyway. This posed somewhat of a dilemma when I found out about this, and I really didn't want to remove axles etc to have the pinion preload setup properly. However, in talking to a diff specialist, he said the best I could do in the circumstances is to apply red loctite and then tighten the pinion nut, and then go a further 1/8 turn. I have to say that at 68 and laying on my back under the car, that extra 1/8 turn was bloody hard to achieve, but with the help of a 2' socket bar I finally managed it.
I haven't fitted the driveshaft yet so I'm optimistic that everything will fit OK. I'll be doing that later this week and I'll let you know how it all goes. Cheers, John
Attach file:
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I had the front ball and trunnion serviced at the same time and was told that the grease was pretty old but the joint itself was in good condition, although wear was evident where the trunnion spends most of its time. When the driveshaft specialist was modifying the driveshaft to take the new uni joint, he also lengthened it so that the trunnion now will spend most of its time about 3/8" further forward. In other words, where there is no wear at all. He then balanced it all but found a slight bend in the driveshaft which he straightened. He reckons it will now "see me out".
I've attached some pic's so you can see what I've been rabbiting on about. The new yoke looks a lot bigger than the old, and physically it is, but the shaft is the same. The slinger fitted to the new yoke actually came off the old one as it isn't supplied with one. It seems I made a mistake in removing the old yoke from the pinion as I should have marked where the pinion nut was and counted the number of turns to remove it. As it happens, I needed an air gun to undo it so I couldn't count 'em anyway. This posed somewhat of a dilemma when I found out about this, and I really didn't want to remove axles etc to have the pinion preload setup properly. However, in talking to a diff specialist, he said the best I could do in the circumstances is to apply red loctite and then tighten the pinion nut, and then go a further 1/8 turn. I have to say that at 68 and laying on my back under the car, that extra 1/8 turn was bloody hard to achieve, but with the help of a 2' socket bar I finally managed it.
I haven't fitted the driveshaft yet so I'm optimistic that everything will fit OK. I'll be doing that later this week and I'll let you know how it all goes. Cheers, John
Attach file:
(118.96 KB)
(104.82 KB)
(83.46 KB)
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