Rob Posted January 10, 2012 Share Posted January 10, 2012 Always trying to help a guy out ya know.Rob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/21884-bounce-slow-motion-video/page/4/#findComment-97433 Share on other sites More sharing options...
leversole Posted February 20, 2012 Author Share Posted February 20, 2012 Update...cant find the post but someone said they might have a three pc crossmember laying around...the inside distance of my double frame rails is 32 1/2"If someone has one they want to get rid of, please let me know...Leslie Quote Link to comment https://www.bigmacktrucks.com/topic/21884-bounce-slow-motion-video/page/4/#findComment-103096 Share on other sites More sharing options...
Brian Blaylock Posted February 21, 2012 Share Posted February 21, 2012 Can you post pics of driveline Quote Link to comment https://www.bigmacktrucks.com/topic/21884-bounce-slow-motion-video/page/4/#findComment-103182 Share on other sites More sharing options...
leversole Posted February 22, 2012 Author Share Posted February 22, 2012 Can you post pics of drivelineWhat are you looking for in particular? I can take whatever you want... Quote Link to comment https://www.bigmacktrucks.com/topic/21884-bounce-slow-motion-video/page/4/#findComment-103279 Share on other sites More sharing options...
Brian Blaylock Posted February 25, 2012 Share Posted February 25, 2012 Some may call it something else but I had a uncle that always said that the u-joints must be in (time) a pic of the drive line could tell Quote Link to comment https://www.bigmacktrucks.com/topic/21884-bounce-slow-motion-video/page/4/#findComment-103946 Share on other sites More sharing options...
leversole Posted March 4, 2012 Author Share Posted March 4, 2012 As requested, here are some driveline photos... Quote Link to comment https://www.bigmacktrucks.com/topic/21884-bounce-slow-motion-video/page/4/#findComment-105537 Share on other sites More sharing options...
hatcity Posted March 4, 2012 Share Posted March 4, 2012 Is it me, or does it appear the drive shaft is not straight?Looks like it is running to the left Quote Success is only a stones throw away.................................................................for a Palestinian Link to comment https://www.bigmacktrucks.com/topic/21884-bounce-slow-motion-video/page/4/#findComment-105540 Share on other sites More sharing options...
leversole Posted March 4, 2012 Author Share Posted March 4, 2012 Transmission in the center, carrier is offset... Quote Link to comment https://www.bigmacktrucks.com/topic/21884-bounce-slow-motion-video/page/4/#findComment-105544 Share on other sites More sharing options...
Brian Blaylock Posted March 4, 2012 Share Posted March 4, 2012 (edited) I know that the carrier is offset but I agree with hatcity in the picture the carrier looks like it is out of line you might want to measure the distance between the tires and frame it looks like the tires on the pass side are closer to the frame than those on the driver side but it could just look that way in the pictures Edited March 4, 2012 by Brian Blaylock Quote Link to comment https://www.bigmacktrucks.com/topic/21884-bounce-slow-motion-video/page/4/#findComment-105552 Share on other sites More sharing options...
Rob Posted March 4, 2012 Share Posted March 4, 2012 I know that the carrier is offset but I agree with leversole you might want to measure the distance between the tires and frame the picture looks like the tires on the pass. Are closer to the frame than the ones on the driver sideI don't remember my B series being offset like that unless there is trunion stand, or bushing wear. I think the driveline should run parallel to the frame rails. It looks like that driveline may be running through two different angles at the same time. I have a B model in the yard and I'll grab some photos, and measurements shortly.I also wonder if when the frame rails were aligned if the wheelbase is the same on both sides?Rob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/21884-bounce-slow-motion-video/page/4/#findComment-105553 Share on other sites More sharing options...
mackcl96 Posted March 4, 2012 Share Posted March 4, 2012 As requested, here are some driveline photos...What I would do is install a cross member in the area of the back of the battery box...........Is that frame patched(welded) in the area of the battery box and is there a patch (welded) on the frame behind the cab on the passenger side???My thought on the fame welding is the tensile strength is weakened from heat and will make the frame act like a rubber bandIs that drive shaft made too long and the slip yoke, not working like it should.. Bottomed out?This could be the reason the rear trans seal is pukingP.S Your air compressor is puking oil Quote Thanks for hearing me out.You can have the soap box now---------JIM Link to comment https://www.bigmacktrucks.com/topic/21884-bounce-slow-motion-video/page/4/#findComment-105554 Share on other sites More sharing options...
leversole Posted March 4, 2012 Author Share Posted March 4, 2012 Passenger side front rear is about 1/2 inch closer to the frame than drivers side...I took it out for a ride, coasted straight to a stop...measured again...about 1/2 inch...rear-rears appear to be centered...Will get out the square and tape measure when the weather breaks (it has been whiteout blizzard, then sun, then more blizzard all day!)..Yes, the inside frame has about a 12 inch patch within the splice on the outside frame rail...I think I alread posted some pictures of this, will find them... Quote Link to comment https://www.bigmacktrucks.com/topic/21884-bounce-slow-motion-video/page/4/#findComment-105584 Share on other sites More sharing options...
Brian Blaylock Posted March 4, 2012 Share Posted March 4, 2012 Is this truck a single axle or tandem? Quote Link to comment https://www.bigmacktrucks.com/topic/21884-bounce-slow-motion-video/page/4/#findComment-105599 Share on other sites More sharing options...
Brian Blaylock Posted March 4, 2012 Share Posted March 4, 2012 Is this truck a single axle or tandem? Quote Link to comment https://www.bigmacktrucks.com/topic/21884-bounce-slow-motion-video/page/4/#findComment-105600 Share on other sites More sharing options...
leversole Posted March 5, 2012 Author Share Posted March 5, 2012 Tandem Quote Link to comment https://www.bigmacktrucks.com/topic/21884-bounce-slow-motion-video/page/4/#findComment-105613 Share on other sites More sharing options...
hatcity Posted March 5, 2012 Share Posted March 5, 2012 Disclaimer: I am not an expertBy your previous pics, it appears you have a twist or bend in there somewhere.1) drive shaft appeared to be running at an angle2) appears that frame rails are not true parallel3) last pic, torque arm does not appear to be lined up straight Quote Success is only a stones throw away.................................................................for a Palestinian Link to comment https://www.bigmacktrucks.com/topic/21884-bounce-slow-motion-video/page/4/#findComment-105617 Share on other sites More sharing options...
hatcity Posted March 5, 2012 Share Posted March 5, 2012 This is what I think of by the title Quote Success is only a stones throw away.................................................................for a Palestinian Link to comment https://www.bigmacktrucks.com/topic/21884-bounce-slow-motion-video/page/4/#findComment-105618 Share on other sites More sharing options...
Rob Posted March 5, 2012 Share Posted March 5, 2012 I measured three of my B models this afternoon. The drive pinion for the front rear is about 3/4" to the left side of the truck on all three. Both inner front drive axle rims measure right at equal distance from the frame on all three trucks. Two of my trucks are spokes, one is Budd and the offsets are different on each truck but the spacing remains equal side to side. The crossmembers are set at 65" apart on one, and 52" on another that I measured.To look at the driveline there is not enough of an offset to see it without looking specifically for it. The uncalibrated eye would not know there is any angularity from side to side.Rob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/21884-bounce-slow-motion-video/page/4/#findComment-105626 Share on other sites More sharing options...
220cummins Posted March 5, 2012 Share Posted March 5, 2012 Measure your trunion stand and mounts on each side to see if its the parallel to one another and the same distance back. It looks like the truck had some butchered frame work. If fabbed and welded correctly(make the frame or frames "z-ed" and staggered joints and weld stick weld "SMAW" not mig with a 7014 or 7018 rod) there should be no question to longevity and strength of the frame. We've done it to a couple 10yrd smith mixers on triaxle DM's and they've lasted for the life of the truck.... Add the crossmembers as mentioned above. Look for egg shaped mounting holes for any all the suspension parts. Look at the torque arm ends to see if they have loose or worn out eyes. Look at the insulator bottom pads and boxes for cracks(if aluminum replace) Check all center bolts on the springs to see if any of them are sheered off. Quote Link to comment https://www.bigmacktrucks.com/topic/21884-bounce-slow-motion-video/page/4/#findComment-105702 Share on other sites More sharing options...
leversole Posted March 7, 2012 Author Share Posted March 7, 2012 Did some measuring today...here are the wheel to frame distancesFront of truck7 1/4 6 5/87 5/16 6 3/4I used a large outside caliper so I would say the measurments are pretty accurate...Center of front rear carrier is offset 1 5/8 inches..End plate on trunnion is 7 1/4 outside of frame rail on pass side, 6 7/8 on drivers side (the opposite of the wheel spacing difference)Did a quick and dirty square check from a hole in the crossmember under the cab to the front perch of the trunnion stand...85 7/8 and 86 3/16...but this may be because of the way I was measuring it. Quote Link to comment https://www.bigmacktrucks.com/topic/21884-bounce-slow-motion-video/page/4/#findComment-106063 Share on other sites More sharing options...
Rob Posted March 8, 2012 Share Posted March 8, 2012 Scribe you a line across the top of the frame rail centered on one of the rivets that retain the crossmember at the rear of the cab on each side. Find another set of holes in the frame just in front of the 5th wheel, (or as far back as possible) and do the same with another set of lines. With a helper measure the diagonal measurements. Before taking your measurements back the truck up at least 10 feet and drive it forward on a level surface without turning while you move forward. This will allow the frame to acheive a neutral plane. These measurements should be the same. If not, split the truck and make them the same before going further.Rob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/21884-bounce-slow-motion-video/page/4/#findComment-106076 Share on other sites More sharing options...
theakerstwo Posted March 8, 2012 Share Posted March 8, 2012 Is it me, or does it appear the drive shaft is not straight?Looks like it is running to the left No it is nThe yoke is not in the cebterot straight but then most mack drive lines do run to the left side.The front rear yoke is off set to one side. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/21884-bounce-slow-motion-video/page/4/#findComment-106079 Share on other sites More sharing options...
leversole Posted March 8, 2012 Author Share Posted March 8, 2012 Scribe you a line across the top of the frame rail centered on one of the rivets that retain the crossmember at the rear of the cab on each side. Find another set of holes in the frame just in front of the 5th wheel, (or as far back as possible) and do the same with another set of lines. With a helper measure the diagonal measurements. Before taking your measurements back the truck up at least 10 feet and drive it forward on a level surface without turning while you move forward. This will allow the frame to acheive a neutral plane. These measurements should be the same. If not, split the truck and make them the same before going further.RobWhatcha mean by "split the truck"? Quote Link to comment https://www.bigmacktrucks.com/topic/21884-bounce-slow-motion-video/page/4/#findComment-106093 Share on other sites More sharing options...
Rob Posted March 8, 2012 Share Posted March 8, 2012 Whatcha mean by "split the truck"?Cut it in half and properly align it before welding back together. The rails absolutely have to be the same length. If there is a factory punched hole in one side, the other side should have a corresponding hole. Everything is built from parallel frame rails equal in spacing, length, and squareness.Rob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/21884-bounce-slow-motion-video/page/4/#findComment-106096 Share on other sites More sharing options...
David Posted March 8, 2012 Share Posted March 8, 2012 Scribe you a line across the top of the frame rail centered on one of the rivets that retain the crossmember at the rear of the cab on each side. Find another set of holes in the frame just in front of the 5th wheel, (or as far back as possible) and do the same with another set of lines. With a helper measure the diagonal measurements. Before taking your measurements back the truck up at least 10 feet and drive it forward on a level surface without turning while you move forward. This will allow the frame to acheive a neutral plane. These measurements should be the same. If not, split the truck and make them the same before going further.RobAlso measure the distance between holes on each frame rail. It may have been put together with one side longer than the other. I also agree with mackcl96, the drive shaft may be to long. I'd pull it check the timing (phase) and have it balanced. If the frame was shortened, the drive shaft may have been changed and have some issues. Quote Link to comment https://www.bigmacktrucks.com/topic/21884-bounce-slow-motion-video/page/4/#findComment-106107 Share on other sites More sharing options...
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