umodelnut Posted November 11, 2011 Share Posted November 11, 2011 Hi guys, i was wondering if mack used the same serial numbers on trucks because my serial number is U685ST-11692 and one of the guys who had my truck said he had another u model and the serial number on that one was U685T-11692. and the only difference is that mine had a tandem rear axle originally and the other one had a single axle rear end. vinny Quote Link to comment https://www.bigmacktrucks.com/topic/21565-another-serial-number-question/ Share on other sites More sharing options...
yarnall Posted November 11, 2011 Share Posted November 11, 2011 No they did not duplicate serial numbers. Either one of you have the numbers mixed up, either model or serial mumber, or someone has messed with one of the trucks. Check the serial numbers on the frame. I do not know where they are on the U model, but someone else on here will.Mike Quote Link to comment https://www.bigmacktrucks.com/topic/21565-another-serial-number-question/#findComment-90571 Share on other sites More sharing options...
Rob Posted November 11, 2011 Share Posted November 11, 2011 No they did not duplicate serial numbers. Either one of you have the numbers mixed up, either model or serial mumber, or someone has messed with one of the trucks. Check the serial numbers on the frame. I do not know where they are on the U model, but someone else on here will.MikeI have actually seen the scenario prior myself with two of grandpa's trucks. Both were built on the same order. Vinny's truck is a U685ST denoting it was built as a tandem. The other U685T was built as a a single drive axle. These are both original configurations. The models are different but the sequential build/serial number very well could be correct.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/21565-another-serial-number-question/#findComment-90572 Share on other sites More sharing options...
umodelnut Posted November 11, 2011 Author Share Posted November 11, 2011 ok i will check my frame later today and let ya know. and the numbers on the frame are on the right side behind the wheel on the frame. Quote Link to comment https://www.bigmacktrucks.com/topic/21565-another-serial-number-question/#findComment-90573 Share on other sites More sharing options...
daveigou Posted November 11, 2011 Share Posted November 11, 2011 Rob is right, it is possible to have two different models with the same chassis number. Quote See my Flickr photostream page http://www.flickr.com/photos/96692978@N05/ Link to comment https://www.bigmacktrucks.com/topic/21565-another-serial-number-question/#findComment-90575 Share on other sites More sharing options...
umodelnut Posted November 11, 2011 Author Share Posted November 11, 2011 so Rob since my u model was built in canada would that mean the truck with the same serial number be built in canada? Quote Link to comment https://www.bigmacktrucks.com/topic/21565-another-serial-number-question/#findComment-90576 Share on other sites More sharing options...
umodelnut Posted November 11, 2011 Author Share Posted November 11, 2011 Ok thanks guys that would be cool if i had two trucks with the same serial number!!! Quote Link to comment https://www.bigmacktrucks.com/topic/21565-another-serial-number-question/#findComment-90577 Share on other sites More sharing options...
Rob Posted November 11, 2011 Share Posted November 11, 2011 so Rob since my u model was built in canada would that mean the truck with the same serial number be built in canada?Not necessarily so. A guess would be the same company, or dealership for stock ordered the chassis on the same production order. When they were actually built, together or not, I have no way to know.I know grandpa ordered two R611's on the same day with one being a tandem, the other a single drive and they came in about three months apart but the serial numbers were just like you mentioned.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/21565-another-serial-number-question/#findComment-90580 Share on other sites More sharing options...
TOMD Posted November 11, 2011 Share Posted November 11, 2011 Hi guys, i was wondering if mack used the same serial numbers on trucks because my serial number is U685ST-11692 and one of the guys who had my truck said he had another u model and the serial number on that one was U685T-11692. and the only difference is that mine had a tandem rear axle originally and the other one had a single axle rear end. vinny One model is a U685T other one is a U685ST diffrent models Quote Tom ~ Parts & Service SpecialistWatt's Mack Sales, Inc. 1-888-304-6225 Link to comment https://www.bigmacktrucks.com/topic/21565-another-serial-number-question/#findComment-90581 Share on other sites More sharing options...
yarnall Posted November 11, 2011 Share Posted November 11, 2011 U685 is the model number. T is a single axle tractor. ST is a tandem tractor. It started at 1001 serial number and should have continued sequentially no matter what letters were after that(S, T, SX, X...) I called Don Schumaker(Curator of the Mack Museum) who said that they did not make two truck of the same model with the same serial number. They each need their own identity. If one is a U686 or some other model they could have the same numbers afterward, but not just the T versus ST. He is looking thru the records of the U685T11692 and U685ST11692 just to make sure something funny did not happen, but it should not have. I have a B66 at home, B66T1194, but I do not have the serial number plate. It is on another truck which is titled as B66T1194, but on its frame rail it a B67T. The guy who rebuilt the truck used the doors and title off the B66. I'll let you know what Don has to say.Mike Quote Link to comment https://www.bigmacktrucks.com/topic/21565-another-serial-number-question/#findComment-90586 Share on other sites More sharing options...
daveigou Posted November 11, 2011 Share Posted November 11, 2011 Trucks of the same model, even if they were built in another plant, (in this case Oakville Ont, Canada) still would not have the same chassis number. Generally speaking, Mack also would not split a customer order (GSO) between two different plants.Also, the chassis number is assigned when the truck clears engineering, sometimes even several weeks before the unit is built, and it is very common that trucks had consecutive serial (chassis) numbers even though they were built weeks apart.I had also been involved in an incident when a truck came into the dealership and the chassis serial did not match the door plate, and the MSO, and the dealer was required to actually X out the number on the frame rail and re-stamp it with a factory stamp set. I was suprised that the customer really didn't have much of a reaction, I expected a problem from him, but it never was. Quote See my Flickr photostream page http://www.flickr.com/photos/96692978@N05/ Link to comment https://www.bigmacktrucks.com/topic/21565-another-serial-number-question/#findComment-90588 Share on other sites More sharing options...
umodelnut Posted November 11, 2011 Author Share Posted November 11, 2011 I checked my frame and it does match the tag on the door. Quote Link to comment https://www.bigmacktrucks.com/topic/21565-another-serial-number-question/#findComment-90592 Share on other sites More sharing options...
jaysm35a2 Posted November 11, 2011 Share Posted November 11, 2011 Well Rob , guess Macks calling your bluff at the museum lol. Quote Link to comment https://www.bigmacktrucks.com/topic/21565-another-serial-number-question/#findComment-90595 Share on other sites More sharing options...
yarnall Posted November 12, 2011 Share Posted November 12, 2011 I spoke with Don Schumaker again. He said there are not two U685's with serial number 11692. Flexivan placed an order for 21 U685ST's. They are all on one General Sales Order so all are spec'd the same. The serial numbers go from U685ST11675-U685ST11695. They were built in Canada. Get your buddy to check his frame rail. Since his is an S he is off by more than one or two numbers.Mike Quote Link to comment https://www.bigmacktrucks.com/topic/21565-another-serial-number-question/#findComment-90652 Share on other sites More sharing options...
umodelnut Posted November 12, 2011 Author Share Posted November 12, 2011 ya mike when i got my build sheets from the mack museum it said all that stuff you said that flexi van ordered 21 of them trucks. my records also said my truck was sent to warwick rhode island factory branch or something like that. thanks vinny Quote Link to comment https://www.bigmacktrucks.com/topic/21565-another-serial-number-question/#findComment-90653 Share on other sites More sharing options...
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