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Post by Nacho-RT74 on Oct 22, 2020 8:01:56 GMT -5
bearings are pressure installed on carrier. They are tappered bearings. The outer tracks/cups are the ones hold by the bearing caps. So usually changing the carrier will become on also install new bearings on it. BTW, that guy on vid it seems to being adjusting on 0.005" backslash ? FSM recomends 0.008" as far I recall. Also needs to be adjusted on both sides to move all the carrier. "Adjusting" just one side, will add preload
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Post by jeremy on Oct 22, 2020 20:18:42 GMT -5
There are no metal shavings in the old diff oil. The gears look perfect to me. The bearings aren't totally silent when I turn the axles, but they aren't screeching. Here's another pic of the mystery line I was asking about earlier. It's a metal line, not rubber. Something else I may need to think about, what kind of maintenance/lubrication do the drive shaft joints need? The fill hole was where it was supposed to be. I've begun soaking the bolt with Liquid Wrench. I don't know about this square head business. I've got a big DeWalt impact wrench which might come in handy here, but not a socket that will work on the square head. Search is pulling up everything with a square drive, which isn't helpful at all.
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Post by jeremy on Oct 22, 2020 20:23:40 GMT -5
bearings are pressure installed on carrier. They are tappered bearings. The outer tracks/cups are the ones hold by the bearing caps. So usually changing the carrier will become on also install new bearings on it. Well that sounds like something I shouldn't be messing with. I think I'm going to put the cover back on, fill up the diff and move on.
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DynoDave
CO-ADMINISTRATOR
Motown Mopar-Wizard
Posts: 11,167
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Post by DynoDave on Oct 22, 2020 21:02:06 GMT -5
I think that's a good plan. I always use a Crescent wrench on square headed plugs like that. EBAY LINKAs for that tube...I've never seen one like that. As your vent bolt isn't a vent either, I would guess this tube is the vent. But I don't know that for sure. I'm wondering if this axle was swapped from something else at some point in the cars life.
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Post by jeremy on Oct 23, 2020 7:32:13 GMT -5
Maybe Nacho has seen it. In another thread we talked about how the diff doesn't look exactly like the 8 1/4 diff. It looks more like a mix of the 8 1/4 and 8 3/4. I suppose it could be something strange that got swapped in, but that seems unlikely. Everything I've seen says it was an original condition car when the previous owner got it - albeit one that had been left out in the weather. I got it with a stock 2 barrel 318, not exactly a powerhouse motor that's going to tear up the rear end.
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Post by 71se3834v on Oct 23, 2020 7:40:34 GMT -5
Adjustable wrench works great on those square head bolt. I deal with them all the time on small engines. Bear in mind the bearing will make a little noise when they are dry. Before putting the cover on I would squirt everything down with gear oil if it's been sitting awhile. Gear oil clings onto parts well but the longer it sits the drier it gets.
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Post by jeremy on Oct 23, 2020 19:03:19 GMT -5
I got the fill bolt with a 5/8's open end box wrench. That spot was hard to get into, but I managed to put the wrench on from the side and pull it from the rear. I couldn't get enough force on it from the side.
I was worried about this one because Uncle Tony put out a video a few days ago where he said he spent all day getting a fill bolt loose, and the threads came with it. I'm glad mine wasn't that tough!
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Post by Nacho-RT74 on Oct 24, 2020 6:23:09 GMT -5
Maybe Nacho has seen it. In another thread we talked about how the diff doesn't look exactly like the 8 1/4 diff. It looks more like a mix of the 8 1/4 and 8 3/4. I don't remember that LOL. Maybe I'm so set to the 8 3/4" axle on mind and a bit unkown about 8 1/4" that I could post some wrong statements. about the fill plug... those are regulary used on plumbering. Sometimes they are with square hole instead the square protussion ( my car is like that ), and I use the rachet square plug to remove it. I never have had any problem to get it loose thought
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Post by jeremy on Oct 25, 2020 1:39:40 GMT -5
Here's an oddity. Both of these came off the differential - the top one is from the top/center bolt, and holds a brake line. I'm not sure which bolt the bottom thing came off of, or why it was there, as it appears to do nothing at all. I can't find it in the pics I took of the diff earlier, for all the gunk and mud. At first I thought it was like the the top clip, but the part that would hold the brake line had rusted away. But O'Reilly's has an identical part - LinkAnybody seen this before? It looks like an aftermarket part that got used as a washer, for God only knows what reason. I suppose that tells me the differential fluid got replaced at some point.
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Post by Nacho-RT74 on Oct 25, 2020 2:23:48 GMT -5
The bottom one seems to be the axle ratio tag. Clean it up and check if you find the ring and pinion ratio stamped
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