Full Floater Posted September 25, 2022 Share Posted September 25, 2022 Hi. Im working on a single axle R with a RAD529C and a CRD1171 Carrier. Do we like these axles? Is there anything to look out for in regards to problems? According to the build sheet and some info I found online, the CRD1171 is some sort of power divider. How does that work in a single axle? Thanks Quote Link to comment Share on other sites More sharing options...
mrsmackpaul Posted September 25, 2022 Share Posted September 25, 2022 Sorry I'm gunna be of no help, very few single drive Macks sold in Australia I have never seen one I'm someone will have the good oil on these Paul 1 Quote Link to comment Share on other sites More sharing options...
Full Floater Posted September 25, 2022 Author Share Posted September 25, 2022 Yeah they are rare here to. Everyone tells me to put an Eaton and air susp in this truck im building but I would MUCH rather run this Mack single drive rear just cause it's something different. And being Mack, probably better. Im hoping. Quote Link to comment Share on other sites More sharing options...
Joey Mack Posted September 25, 2022 Share Posted September 25, 2022 Pic's please..... We love 'em !!! Quote Link to comment Share on other sites More sharing options...
Full Floater Posted September 26, 2022 Author Share Posted September 26, 2022 Quote Link to comment Share on other sites More sharing options...
Joey Mack Posted September 26, 2022 Share Posted September 26, 2022 That's really cool. I don't think I ever saw one of those.. I like the idea of keeping it.. Jojo Quote Link to comment Share on other sites More sharing options...
Full Floater Posted September 26, 2022 Author Share Posted September 26, 2022 Thank you. Yup im hoping it will turn out well. It's a 23k rating which is exactly what I need for the application it's going into. And im just fine with spring suspension. It's fairly low mileage and feels tight 1 Quote Link to comment Share on other sites More sharing options...
Full Floater Posted September 27, 2022 Author Share Posted September 27, 2022 Anyone know the oil grade they require? I would guess probably 80w-90 but i'd like to go 75w-140, just wanna make sure I don't bugger this thing up by doing that Quote Link to comment Share on other sites More sharing options...
Joey Mack Posted September 27, 2022 Share Posted September 27, 2022 Hmmm? Don't see why 80W90 would be wrong.. you reckon, the climate you are in should dictate? As well as oil change intervals... Synthetic oil wasnt around when it was born.. jojo 1 Quote Link to comment Share on other sites More sharing options...
Joey Mack Posted September 27, 2022 Share Posted September 27, 2022 I'm no pro, but you reckon the hubs have a seal in the middle, and the wheel bearings are packed with grease, like a B-Model? 1 Quote Link to comment Share on other sites More sharing options...
Full Floater Posted September 27, 2022 Author Share Posted September 27, 2022 8 hours ago, Joey Mack said: I'm no pro, but you reckon the hubs have a seal in the middle, and the wheel bearings are packed with grease, like a B-Model? I'm totally unsure at this point. Have not pulled the hubs off this one, yet. Quote Link to comment Share on other sites More sharing options...
Joey Mack Posted September 27, 2022 Share Posted September 27, 2022 No biggie, just tossin some stuff out there... When I did the B-model, I removed the inner seal, and filled it with oil... 80W90... jojo Quote Link to comment Share on other sites More sharing options...
Full Floater Posted September 30, 2022 Author Share Posted September 30, 2022 If anyone out there has a service manual for this particular axle, and is willing to sell it.....I'd buy it Quote Link to comment Share on other sites More sharing options...
mrsmackpaul Posted September 30, 2022 Share Posted September 30, 2022 Definitely never seen one of these And as for power divider that was mentioned back at the beginning I can see a housing that looks a bit like one there but as to how it would on a single drive ?? No idea at all My first thoughts were a bit like LSD but I cant see how that would work f from the housing out the front The banjo housing looks a little like a normal top mount Mack housing turned 90 degrees No idea if that is the case I assume that it is double reduction ? Paul Quote Link to comment Share on other sites More sharing options...
Joey Mack Posted September 30, 2022 Share Posted September 30, 2022 what year is the 'R' model? I havent found a manual for that rear end yet.. Mack E-Media, didnt help.. I would love to see it up close to get a better understanding of how it works.. I wouls say itsa locking diff. over a power divider, since its a single 'x'... jojo Quote Link to comment Share on other sites More sharing options...
doubleclutchinweasel Posted September 30, 2022 Share Posted September 30, 2022 That does look to be a double-reduction axle. You can see the caps for the cross-shaft in the lower picture he sent (see below). I have never heard of any issues with these. They are, as mentioned above, not that much different from the standard Mack tandem axle, just rotated 90°. Power Divider makes no sense whatsoever in a single axle, UNLESS they put in something similar to the inter-axle Power Divider as a limited slip unit? Instead of biasing power to the front or rear axle, it would do so to the LH or RH axle? Just guessing on that, though. Basically would be like a gear type limited slip unit. Maybe somebody smarter than me can shed some light on that. Incidentally, I have seen both these "front loaded" and "top loaded" Mack axles in single-screw applications. I saw a LOT more of these "front loaded" units in B models than in R models. I say keep it! And paint the "Mack" script in a contrasting color so everybody can see it! 2 Quote "Eagles may soar, but weasels don't get sucked into jet engines." Link to comment Share on other sites More sharing options...
doubleclutchinweasel Posted September 30, 2022 Share Posted September 30, 2022 Here's you a little something... 1 Quote "Eagles may soar, but weasels don't get sucked into jet engines." Link to comment Share on other sites More sharing options...
mechohaulic Posted September 30, 2022 Share Posted September 30, 2022 On 9/27/2022 at 10:36 AM, Joey Mack said: No biggie, just tossin some stuff out there... When I did the B-model, I removed the inner seal, and filled it with oil... 80W90... jojo back in the day when a conversion was done changing from inner oil seal removal to one seal ,the outer seal had to be changed from leather grease seal to "new" style oil seal . today must be one style fits all ? Quote Link to comment Share on other sites More sharing options...
Joey Mack Posted September 30, 2022 Share Posted September 30, 2022 I had to measure the hub and axle to find the correct seal.. There are many different seals.. It was easy to do.. jojo Quote Link to comment Share on other sites More sharing options...
Joey Mack Posted September 30, 2022 Share Posted September 30, 2022 I am also posting my thoughts about the hub seal/s, is because if you are going to use this axle, you may as well pull the hubs to inspect the bearings, and then re-seal the hub's the best way possible. grease has worked for decades, and oil bath is pretty good too.. jojo Quote Link to comment Share on other sites More sharing options...
Full Floater Posted October 1, 2022 Author Share Posted October 1, 2022 (edited) This axle is from a 1976 R 685ST Yes I will be pulling the hubs to give it a good inspection and replace the hub seals for sure and likely the brake linings. Hopefully I can get a number off the seals when I pull them out. Will change the gear oil and probably leave the rest alone for now. Yes I do believe that the "power divider" description in the build sheet might be reference to a LSD type axle, shifting power from side to side instead of axle to axle. After checking oil levels I will drive the truck over some loose ground with no weight in the back and see if both wheels have a tendency to put power to the ground instead of just one wheel. I think painting the MACK lettering on the rear of the axle in the same red that the cab is going to be, is and excellent idea. Let everyone behind me know for sure they are following a pedigree Mack. May as well throw some Mack "greatest name in trucks" mud flaps on to! Edited October 1, 2022 by Full Floater 2 Quote Link to comment Share on other sites More sharing options...
Joey Mack Posted October 1, 2022 Share Posted October 1, 2022 You got this !!!!! 1 Quote Link to comment Share on other sites More sharing options...
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