Nick40B Posted December 10 Share Posted December 10 Hi all Im new to BMT, recently joined I’ve sent my vin to mack and they’ve come back saying it’s a 1979 R685RST. can someone confirm what engine/gearbox and rear end these came with from factory? From what I’ve seen it should have the maxidyne engine. It has a maxi dyne sticker on the dash yet has econodyne on both sides of the bonnet southwest qld, Australia 2 Quote Link to comment https://www.bigmacktrucks.com/topic/74849-1979-r685rst/ Share on other sites More sharing options...
harrybarbon Posted December 10 Share Posted December 10 Mack man Gary Richards and his former Mack Brisbane co-workers have all the build sheets for the Aust'n built trucks. Try contact Gary and he should be able to get the sheets for you. Your R looks like an ex Think Pink concrete and quarry company - Farley and Lewis or a Readymix truck. F&L was merged into Readymix Company in the early 1980's, during the R model build years. After the merger all the Readymix fleet including the permanent sub-contractors trucks were painted the pink and white colours like your Mack. R Macks were the majority of tipper and cement tanker trucks of the Readymix and F&L fleet during the 1980's. And same for Boral and Pioneer. Readymix, Boral and Pioneer had US and Canada concrete, quarrying and cement operations. Readymix became one of the largest USA operators and its USA operations now are part of the Mexican concrete, quarrying and cement companies. Quote Link to comment https://www.bigmacktrucks.com/topic/74849-1979-r685rst/#findComment-563655 Share on other sites More sharing options...
harrybarbon Posted December 10 Share Posted December 10 Correct name was Farley & Lewers. This is Readymix after repaint. I dont recall if Readymix painted its USA trucks pink and white. Quote Link to comment https://www.bigmacktrucks.com/topic/74849-1979-r685rst/#findComment-563656 Share on other sites More sharing options...
terry Posted December 10 Share Posted December 10 4 hours ago, Nick40B said: Hi all Im new to BMT, recently joined I’ve sent my vin to mack and they’ve come back saying it’s a 1979 R685RST. can someone confirm what engine/gearbox and rear end these came with from factory? From what I’ve seen it should have the maxidyne engine. It has a maxi dyne sticker on the dash yet has econodyne on both sides of the bonnet southwest qld, Australia R685ST is a 237 engine with a six speed, S means six wheel, T means. Tractor But hard telling what had been changed in the mean time. Terry 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74849-1979-r685rst/#findComment-563664 Share on other sites More sharing options...
Nick40B Posted December 10 Author Share Posted December 10 5 hours ago, harrybarbon said: Correct name was Farley & Lewers. This is Readymix after repaint. I dont recall if Readymix painted its USA trucks pink and white. I’ll attach some old photos. Unsure on full history of the truck Quote Link to comment https://www.bigmacktrucks.com/topic/74849-1979-r685rst/#findComment-563683 Share on other sites More sharing options...
Mark T Posted December 10 Share Posted December 10 10 hours ago, Nick40B said: Hi all Im new to BMT, recently joined I’ve sent my vin to mack and they’ve come back saying it’s a 1979 R685RST. can someone confirm what engine/gearbox and rear end these came with from factory? From what I’ve seen it should have the maxidyne engine. It has a maxi dyne sticker on the dash yet has econodyne on both sides of the bonnet southwest qld, Australia Sorta resembles Paul's in ways. Quote Link to comment https://www.bigmacktrucks.com/topic/74849-1979-r685rst/#findComment-563690 Share on other sites More sharing options...
mowerman Posted December 10 Share Posted December 10 I think they pretty much all look like that over there …. Bob Quote Link to comment https://www.bigmacktrucks.com/topic/74849-1979-r685rst/#findComment-563693 Share on other sites More sharing options...
mowerman Posted December 10 Share Posted December 10 I don’t know if we ever found out why they run a lot of dual air breathers Quote Link to comment https://www.bigmacktrucks.com/topic/74849-1979-r685rst/#findComment-563694 Share on other sites More sharing options...
Joseph Cummings Posted December 10 Share Posted December 10 Should be a ENDT675 engine (237) Either a TRL107 (5 speed) or TRXL107 (6 speed) transmission And my best guess would be 38,000 pound rears on Camelback suspension. But I would need pictures to say for sure. 34,000 , 38,000 . and 44,000 shared lots of parts. In 79 44,000 would have cones on the axle ends. This picture is of the cones. It's a Mack 44,000 of about that vintage 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74849-1979-r685rst/#findComment-563699 Share on other sites More sharing options...
cruiseliner64 Posted December 11 Share Posted December 11 2 hours ago, mowerman said: I don’t know if we ever found out why they run a lot of dual air breathers Probably for the dusty outback roads id say but im sure mrs mack could tell us more... Paul 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74849-1979-r685rst/#findComment-563701 Share on other sites More sharing options...
Popular Post Joseph Cummings Posted December 11 Popular Post Share Posted December 11 They like those scoups too. And their visors are kinda rounded. Probably has something to do with living your life upside-down and driving on the wrong side of the road 🙃 3 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74849-1979-r685rst/#findComment-563704 Share on other sites More sharing options...
mowerman Posted December 11 Share Posted December 11 OK, let’s just hilarious. I just thought it was their style, but I’m sure I will hear from Paul to give us a real rundown on them. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74849-1979-r685rst/#findComment-563706 Share on other sites More sharing options...
Joseph Cummings Posted December 11 Share Posted December 11 I'm telling you I learned all about Australians from watching Skippy the Bush Kangaroo in the 1960's They drive weird Ford station wagons, have pet kangaroos, and go around singing "Tie Me Kangaroo Down Sport" and "Waltzing Matilda" 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74849-1979-r685rst/#findComment-563719 Share on other sites More sharing options...
Popular Post mrsmackpaul Posted December 11 Popular Post Share Posted December 11 Ha ha bloody ha you lot Okay simple answers for you lot The bonnet (hood) scoop on the first cool power jobbies blocked up to easily and quickly The dual intake thru the one air cleaner had similar issues Dual aircleaners were started on Mack coolpowered jobbies and pretty quickly most makes of heavy trucks in Australia did the same Halve the air flow and you get 4 times the life between services Sunvisors, unlike some that have visors for looks, the Australian ones are quite huge by world standards and back in the day before gay stainless steel drop visors that are probably more suited to a gay Volvo type of hipster than a propper truck driver Visors curl right around to block the rising and setting sun from the side on view So most of Australia's land mass is flat, very very flat, flat as a shit carters hat so to speak This means the sun takes hours to go down, whilst this is quicker than most women, it means we gotta squint for a hour or so So we need proper sunvisors and propper air intakes Oh and quality Macks like R and FR models built by Australians in Australia for Australians use the chassis number not the vin number Chassis number is behind the first drive axle on the drivers side So if you if you have a stainless steel drop visor, pad up precious you delicate little cup cake 😘😘🦘 Paul 1 1 4 Quote Link to comment https://www.bigmacktrucks.com/topic/74849-1979-r685rst/#findComment-563721 Share on other sites More sharing options...
cruiseliner64 Posted December 11 Share Posted December 11 9 hours ago, Joseph Cummings said: They like those scoups too. And their visors are kinda rounded. Probably has something to do with living your life upside-down and driving on the wrong side of the road 🙃 Ha ha...we drive on the "wrong" side of the road over here too🤣.... Paul 2 Quote Link to comment https://www.bigmacktrucks.com/topic/74849-1979-r685rst/#findComment-563723 Share on other sites More sharing options...
Popular Post Mark T Posted December 11 Popular Post Share Posted December 11 1 hour ago, mrsmackpaul said: Ha ha bloody ha you lot Okay simple answers for you lot The bonnet (hood) scoop on the first cool power jobbies blocked up to easily and quickly The dual intake thru the one air cleaner had similar issues Dual aircleaners were started on Mack coolpowered jobbies and pretty quickly most makes of heavy trucks in Australia did the same Halve the air flow and you get 4 times the life between services Sunvisors, unlike some that have visors for looks, the Australian ones are quite huge by world standards and back in the day before gay stainless steel drop visors that are probably more suited to a gay Volvo type of hipster than a propper truck driver Visors curl right around to block the rising and setting sun from the side on view So most of Australia's land mass is flat, very very flat, flat as a shit carters hat so to speak This means the sun takes hours to go down, whilst this is quicker than most women, it means we gotta squint for a hour or so So we need proper sunvisors and propper air intakes Oh and quality Macks like R and FR models built by Australians in Australia for Australians use the chassis number not the vin number Chassis number is behind the first drive axle on the drivers side So if you if you have a stainless steel drop visor, pad up precious you delicate little cup cake 😘😘🦘 Paul Ya know??? I almost get the impression you're not real fond of dropped visors 😂 . I think now they actually come with a spot etched and powder coated with a pride flag on the ends 1 5 Quote Link to comment https://www.bigmacktrucks.com/topic/74849-1979-r685rst/#findComment-563724 Share on other sites More sharing options...
cruiseliner64 Posted December 11 Share Posted December 11 4 hours ago, mrsmackpaul said: Ha ha bloody ha you lot Okay simple answers for you lot The bonnet (hood) scoop on the first cool power jobbies blocked up to easily and quickly The dual intake thru the one air cleaner had similar issues Dual aircleaners were started on Mack coolpowered jobbies and pretty quickly most makes of heavy trucks in Australia did the same Halve the air flow and you get 4 times the life between services Sunvisors, unlike some that have visors for looks, the Australian ones are quite huge by world standards and back in the day before gay stainless steel drop visors that are probably more suited to a gay Volvo type of hipster than a propper truck driver Visors curl right around to block the rising and setting sun from the side on view So most of Australia's land mass is flat, very very flat, flat as a shit carters hat so to speak This means the sun takes hours to go down, whilst this is quicker than most women, it means we gotta squint for a hour or so So we need proper sunvisors and propper air intakes Oh and quality Macks like R and FR models built by Australians in Australia for Australians use the chassis number not the vin number Chassis number is behind the first drive axle on the drivers side So if you if you have a stainless steel drop visor, pad up precious you delicate little cup cake 😘😘🦘 Paul Fair play paul I knew we could get the real reason for all this from you in a practical and humourous way....understated as always🤣🤣🤣 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74849-1979-r685rst/#findComment-563735 Share on other sites More sharing options...
mowerman Posted December 11 Share Posted December 11 Yeah Paul thanks for the hilarious response I see visors on Peterbilt around here that are so low. I don’t know how they make it through the scales. And Joseph that looks like a cute little show. I don’t know how I missed it. I was a kid in the 60s. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74849-1979-r685rst/#findComment-563750 Share on other sites More sharing options...
Nick40B Posted December 11 Author Share Posted December 11 18 hours ago, Joseph Cummings said: Should be a ENDT675 engine (237) Either a TRL107 (5 speed) or TRXL107 (6 speed) transmission And my best guess would be 38,000 pound rears on Camelback suspension. But I would need pictures to say for sure. 34,000 , 38,000 . and 44,000 shared lots of parts. In 79 44,000 would have cones on the axle ends. This picture is of the cones. It's a Mack 44,000 of about that vintage I’ve since removed the chrome caps. But yes it look exactly like that. My parts guy believes it’s had a rear end swap from 34k-44k 10 leaf pack the diffs have 8.24 ratio stamped on the front of the carrier housing 2 Quote Link to comment https://www.bigmacktrucks.com/topic/74849-1979-r685rst/#findComment-563760 Share on other sites More sharing options...
Joseph Cummings Posted December 11 Share Posted December 11 8.24 ratio isn't going to run too fast if it has one of the two transmissions I mentioned. They are both direct 1 to 1 in high. would make for about a 35 MPH top speed. The drop in from a set of 34,000 or 38,000 will fit right in if you want to change axle ratios. You just have to check that your axle splines are the same some were different. You have the steel case drop in carriers. The torque rod mounts in with a tapered stud. You can use the aluminum cases also but the torque rod bolts on with two bolts, You will have to modify or change them. This picture is an aluminum case. You can see the torque rod mounting is different from yours Quote Link to comment https://www.bigmacktrucks.com/topic/74849-1979-r685rst/#findComment-563785 Share on other sites More sharing options...
Joseph Cummings Posted December 11 Share Posted December 11 6 hours ago, mowerman said: Yeah Paul thanks for the hilarious response I see visors on Peterbilt around here that are so low. I don’t know how they make it through the scales. And Joseph that looks like a cute little show. I don’t know how I missed it. I was a kid in the 60s. Yeah Skippy was like the Australian Lassie. The dad was a park ranger, and they had a Bell 47 helicopter. I don't think it was on one of the major networks here in the US, it must have been on one of the UHF channels 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74849-1979-r685rst/#findComment-563790 Share on other sites More sharing options...
Nick40B Posted December 12 Author Share Posted December 12 4 hours ago, Joseph Cummings said: 8.24 ratio isn't going to run too fast if it has one of the two transmissions I mentioned. They are both direct 1 to 1 in high. would make for about a 35 MPH top speed. The drop in from a set of 34,000 or 38,000 will fit right in if you want to change axle ratios. You just have to check that your axle splines are the same some were different. You have the steel case drop in carriers. The torque rod mounts in with a tapered stud. You can use the aluminum cases also but the torque rod bolts on with two bolts, You will have to modify or change them. This picture is an aluminum case. You can see the torque rod mounting is different from yours I suspect the gear sets have been changed. Front diff carrier housing is stamped 8.24. Rear is 5.14 or so, however it sits on 100kmh happily in top cog around 1700 odd rpm lots going on with this truck Quote Link to comment https://www.bigmacktrucks.com/topic/74849-1979-r685rst/#findComment-563803 Share on other sites More sharing options...
Joseph Cummings Posted December 12 Share Posted December 12 49 minutes ago, Nick40B said: I suspect the gear sets have been changed. Front diff carrier housing is stamped 8.24. Rear is 5.14 or so, however it sits on 100kmh happily in top cog around 1700 odd rpm lots going on with this truck That might even be a set of 3.87 ratios. Is it on 11r24,5 tires? Quote Link to comment https://www.bigmacktrucks.com/topic/74849-1979-r685rst/#findComment-563804 Share on other sites More sharing options...
mrsmackpaul Posted December 12 Share Posted December 12 4 hours ago, Joseph Cummings said: That might even be a set of 3.87 ratios. Is it on 11r24,5 tires? Not likely in this wide brown land 10.00 x 20 are pretty much the standard Tape a piece of string on the tail shaft, drive one wheel revolution forward, hop out and count how many times the string has wrapped around the tail shaft Thats your diff ratio 5.14 will allow 100 kmh with a OD transmission Paul 2 Quote Link to comment https://www.bigmacktrucks.com/topic/74849-1979-r685rst/#findComment-563805 Share on other sites More sharing options...
Geoff Weeks Posted December 12 Share Posted December 12 (edited) On other makes with single reduction rears, the tooth count is most often stamped in the head of the pinion (rear-rear on a set of bogies) eliminates guess work, like "was that 3.7 times or 3.9 time around the shaft?" Because the gear set is "mated" at the time of mfg, it will be correct. For Eaton 2spds it will be the "high ratio". Don't know how Mack does it with their double reduction. esp if someone changes the gear-set and doesn't re-stamp the ratio on the housing. Edited December 12 by Geoff Weeks 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74849-1979-r685rst/#findComment-563816 Share on other sites More sharing options...
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