tanbuddy Posted August 5, 2011 Share Posted August 5, 2011 I have a 79 u model, and all the weight rating tags are removed on the truck. I would like to figure out what rears are in it and gvw & gcw this truck is rated at. The rear is tandem with 5 spoke wheels, 8 bolts hold on the covers for the axle shafts. only the front rear has a parking brake, there are 2 torque rods and no traverse rods. the steer axle has 6 bolt wheels, and 3 leafs in the pack.thanks for any help Quote 79 U237 5 sp Link to comment https://www.bigmacktrucks.com/topic/20056-rear-axles-rating/ Share on other sites More sharing options...
tanbuddy Posted August 10, 2011 Author Share Posted August 10, 2011 Is there any tags hidden somewhere that i could find the specs for theses axles? Theres a lot of crud on there but if i could pressure wash them Quote 79 U237 5 sp Link to comment https://www.bigmacktrucks.com/topic/20056-rear-axles-rating/#findComment-83491 Share on other sites More sharing options...
David Posted August 11, 2011 Share Posted August 11, 2011 You probably have 38k rear axles. The axle flange with the eight bolts is about 6 1/2" dia.? The springs could be either 34k or 38k. How many leafs? How wide? How thick? Look for numbers on the front of the steering axle, right side. Quote Link to comment https://www.bigmacktrucks.com/topic/20056-rear-axles-rating/#findComment-83512 Share on other sites More sharing options...
tanbuddy Posted August 14, 2011 Author Share Posted August 14, 2011 The rear springs are 4 inches wide by 8 inches thick, 10 leafs. The center hub was about 7 inches wide. I found markings on the rear rear by the drain plug, SS 34 10....so im guessing that means 34 k rears? I still didnt check on the front end yet. Quote 79 U237 5 sp Link to comment https://www.bigmacktrucks.com/topic/20056-rear-axles-rating/#findComment-83698 Share on other sites More sharing options...
Rob Posted August 14, 2011 Share Posted August 14, 2011 I think you are correct on the 34's.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/20056-rear-axles-rating/#findComment-83699 Share on other sites More sharing options...
tanbuddy Posted August 22, 2011 Author Share Posted August 22, 2011 is there a way to decode the front axle numbers, all i saw were serial numbers, nothing that gave a weight rating? Quote 79 U237 5 sp Link to comment https://www.bigmacktrucks.com/topic/20056-rear-axles-rating/#findComment-84239 Share on other sites More sharing options...
David Posted August 22, 2011 Share Posted August 22, 2011 Post what you found. Someone will help you. Quote Link to comment https://www.bigmacktrucks.com/topic/20056-rear-axles-rating/#findComment-84243 Share on other sites More sharing options...
daveigou Posted August 23, 2011 Share Posted August 23, 2011 On a 79 the axle model numbers should be stamped in the casting. For the rear axles (assuming it's a tandem with Mack rears), look at the rear rear, (from the rear of the truck) just below and to the left of the check plug, there should be numbers like "SS34C" or something similar.On the steering axle, looking under the front of the truck, just under the RH spring there should be numbers also stamped in, usually starting with "FA", like "FA" or "FAW" with some numbers, like "FAW617C" or something similar.Dave Quote See my Flickr photostream page http://www.flickr.com/photos/96692978@N05/ Link to comment https://www.bigmacktrucks.com/topic/20056-rear-axles-rating/#findComment-84277 Share on other sites More sharing options...
tanbuddy Posted August 24, 2011 Author Share Posted August 24, 2011 Under the passenger side spring it reads FAV 537, theres some other serial numbers there too, if there important i can post them as well Quote 79 U237 5 sp Link to comment https://www.bigmacktrucks.com/topic/20056-rear-axles-rating/#findComment-84328 Share on other sites More sharing options...
daveigou Posted August 28, 2011 Share Posted August 28, 2011 Your steer axle is likely a FAW537 (or some similar variation depending on the style brakes) 12,000# axle, and you already figured out the rears are 34,000#Dave Quote See my Flickr photostream page http://www.flickr.com/photos/96692978@N05/ Link to comment https://www.bigmacktrucks.com/topic/20056-rear-axles-rating/#findComment-84555 Share on other sites More sharing options...
tanbuddy Posted August 29, 2011 Author Share Posted August 29, 2011 That doesnt make it much of a dump truck, but ive had over 50 000 on it before. Quote 79 U237 5 sp Link to comment https://www.bigmacktrucks.com/topic/20056-rear-axles-rating/#findComment-84634 Share on other sites More sharing options...
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