Truckcrazy Posted June 2 Share Posted June 2 (edited) Just to complicate things sometimes S stands for single reduction rear. I’ve seen it in fire trucks but might have been used in other models. But with B’s and R’s before the long vin the S was for six wheels. There has to be a table somewhere with all this in it. Edited June 10 by Truckcrazy 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73175-mack-b873sx-restoration/page/9/#findComment-576805 Share on other sites More sharing options...
mechohaulic Posted June 9 Share Posted June 9 On 6/1/2025 at 7:53 PM, mechohaulic said: S would be a 6 wheel truck- count wheels not tires . 4 wheels on rear and 2 on steer. 4+2 == 6. the T in vin would be single axle. while at Mack Blakeslee prestress ordered a fleet of huge heavy DM's . combo of single axles and tandems; the single axles having frame rails ft higher than most were DM611 ?? - all had quads. now I confused myself and contradicted earlier post , they were very heavy triple framed with 100 ton osculating 5th wheels (which I installed everyone ) having 4 in spacer blocks under 5th wheel plates. all 3/4 hand drilled bolts. they may have been DM611 T's single axle DM's would be DM611X. looked at one today at truck show in Bethlehem CT specifically to see model . NOT DM === T's. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73175-mack-b873sx-restoration/page/9/#findComment-577201 Share on other sites More sharing options...
mowerman Posted June 9 Share Posted June 9 i believe i did read that,somewhere,,,i think one of my mack manuals explains all of the letters and explanations havent had time to pull them out but now im very curious,,,,off to the GYM,,bob Quote Link to comment https://www.bigmacktrucks.com/topic/73175-mack-b873sx-restoration/page/9/#findComment-577228 Share on other sites More sharing options...
mowerman Posted June 9 Share Posted June 9 On 6/1/2025 at 5:05 PM, mechohaulic said: no such thing as "I haven't done anything ":you were pacing yourself during extreme conditions building energy to give it heck later .!! im supposed to be pulling my wifes vacuum cleaner apart after GYM,,,i might have to bring a fan out there,,,it has been very hot here lately,,but im not complaining,,,ohhhh no were stepping all over hicrops tread sorry,,,lol.bob 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73175-mack-b873sx-restoration/page/9/#findComment-577229 Share on other sites More sharing options...
Popular Post hicrop10 Posted July 14 Author Popular Post Share Posted July 14 It been awhile since I’ve posted about any progress I have made on the truck.I have all the tires mounted and on the truck.I went with gray wheels,they really break up all the red.Am sandblasting the fuel tanks and front bumper then I will mount them.Just waiting for the body guy to call so I can get the cab and fenders,hood to him.Will get some pictures of the wheels tomorrow and post them. 6 Quote Link to comment https://www.bigmacktrucks.com/topic/73175-mack-b873sx-restoration/page/9/#findComment-579103 Share on other sites More sharing options...
hicrop10 Posted 19 hours ago Author Share Posted 19 hours ago Found some pin holes in my one fuel tank,has anyone used JB weld on pin holes? If not what have you used? Quote Link to comment https://www.bigmacktrucks.com/topic/73175-mack-b873sx-restoration/page/9/#findComment-579585 Share on other sites More sharing options...
tjc transport Posted 19 hours ago Share Posted 19 hours ago 4 minutes ago, hicrop10 said: Found some pin holes in my one fuel tank,has anyone used JB weld on pin holes? If not what have you used? not jb, but we used to use the epoxy stick bade for fuel leaks. dont remember who made it, but i want to say 3M 1 Quote when you are up to your armpits in alligators, it is hard to remember you only came in to drain the swamp.. Link to comment https://www.bigmacktrucks.com/topic/73175-mack-b873sx-restoration/page/9/#findComment-579586 Share on other sites More sharing options...
steve s. Posted 11 hours ago Share Posted 11 hours ago To fix my leaks I used a MIG welder. My tank had a bunch of tiny leaks under the tank straps. Of course the tank was off the truck and empty. I ran compressed air through the tank for a few minutes first. None of the small short welds made enough heat to do any harm. I kept putting air to into the tank after each spot was welded and eventually I found all of the pinholes and welded them up. Quote Link to comment https://www.bigmacktrucks.com/topic/73175-mack-b873sx-restoration/page/9/#findComment-579607 Share on other sites More sharing options...
mrsmackpaul Posted 10 hours ago Share Posted 10 hours ago I leave the air flowing into the tank why I weld the holes Never had a issue, diesel is more dangerous than petrol as the metal absorbs the diesel and it sort of evaporates off as it is welded, can be seen while welding quite easily Once petrol is evaporated it is gone, just something to remember when welding diesel tanks Paul Quote Link to comment https://www.bigmacktrucks.com/topic/73175-mack-b873sx-restoration/page/9/#findComment-579616 Share on other sites More sharing options...
mowerman Posted 10 hours ago Share Posted 10 hours ago Yeah, Dean did a real nice job on his LJ tank. I am not sure how he did it, but it took him a few times to cover all the holes. I’m sure he will chime in…. Good luck Quote Link to comment https://www.bigmacktrucks.com/topic/73175-mack-b873sx-restoration/page/9/#findComment-579617 Share on other sites More sharing options...
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