Macktruckman Posted February 25 Share Posted February 25 Can anyone tell me what the original specs of this truck would be? Thank you Quote Link to comment https://www.bigmacktrucks.com/topic/73910-rd-specs/ Share on other sites More sharing options...
0 mowerman Posted February 26 Share Posted February 26 I was running I five in California at the time coppers are pretty cool at night, but in the daytime they lean on you pretty good and hide and real good spots Quote Link to comment https://www.bigmacktrucks.com/topic/73910-rd-specs/page/3/#findComment-547257 Share on other sites More sharing options...
0 Macktruckman Posted February 26 Author Share Posted February 26 😂 hahaha Quote Link to comment https://www.bigmacktrucks.com/topic/73910-rd-specs/page/3/#findComment-547258 Share on other sites More sharing options...
0 Macktruckman Posted March 22 Author Share Posted March 22 Anyone ever know what rears these are? I know they are a solid walking beam but are they 44’s? Or 58’s or what? josh Quote Link to comment https://www.bigmacktrucks.com/topic/73910-rd-specs/page/3/#findComment-548686 Share on other sites More sharing options...
0 880joe Posted March 22 Share Posted March 22 I parted out a 78 R model that had rears that looked just like those and they were 38's Quote Link to comment https://www.bigmacktrucks.com/topic/73910-rd-specs/page/3/#findComment-548689 Share on other sites More sharing options...
0 Macktruckman Posted March 23 Author Share Posted March 23 With the 6 spoke hubs ? We had some around when I was young that were 5 spoke. Josh Quote Link to comment https://www.bigmacktrucks.com/topic/73910-rd-specs/page/3/#findComment-548733 Share on other sites More sharing options...
0 880joe Posted March 23 Share Posted March 23 I don't remember if they were 5 or 6 spoke hubs but what I can see of your axle looks like the common 8 bolt used on 38's the heavier axle I've seen used 6 bolt or the cone shaped axles 2 Quote Link to comment https://www.bigmacktrucks.com/topic/73910-rd-specs/page/3/#findComment-548734 Share on other sites More sharing options...
0 Macktruckman Posted March 23 Author Share Posted March 23 Gotcha. Very well could be I suppose. I assumed since it was built new as a 12 yard mixer it would have heavier rated axles. But I don’t know that to be sure. It has 5.73 ratio. josh Quote Link to comment https://www.bigmacktrucks.com/topic/73910-rd-specs/page/3/#findComment-548756 Share on other sites More sharing options...
0 Macktruckman Posted March 23 Author Share Posted March 23 I called mack. They cant tell me the rear suspension. Only the numbers on the tag that I already posted. The guy was surprised to hear they could be 38’s in a mixer. He said he hadn’t heard of that. He said that the front axle number is FA617C but couldn’t tell me anything else. He said their data is pretty limited these days. josh Quote Link to comment https://www.bigmacktrucks.com/topic/73910-rd-specs/page/3/#findComment-548757 Share on other sites More sharing options...
0 JoeH Posted March 25 Share Posted March 25 Typically an rd690"S" would be 44k rear camelback. An "SX" would be 58k or higher. "ST" would be either 34k or usually 38k. If this was a concrete mixer then yes I expect it's just a solid beam version of the Mack Camelback. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73910-rd-specs/page/3/#findComment-548817 Share on other sites More sharing options...
0 Macktruckman Posted March 25 Author Share Posted March 25 Yeah Joe it was built new as a mixer which im sure explains why it’s a solid walking beam. I just don’t know how to tell what the rear axles are by looking. It has the bolt on caps over the trunion where my 38’s are open ended bushings. So 44 seems plausible. I sorta expected that they would be heavier than 38 being a mixer but I wouldn’t really know. Do you know if any of it will interchange with my 38 camelbacks? Mine has 4.17 will they work in the heavier rears ? Bolt in? Or are they different? I think the 5.73 in the mixer rears are too slow for my use. Might help my power though. Thank you for all the replies btw. Josh Quote Link to comment https://www.bigmacktrucks.com/topic/73910-rd-specs/page/3/#findComment-548820 Share on other sites More sharing options...
0 880joe Posted March 25 Share Posted March 25 Your differential should be interchangeable 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73910-rd-specs/page/3/#findComment-548843 Share on other sites More sharing options...
0 Macktruckman Posted March 25 Author Share Posted March 25 Thank you. This is a potential mostly complete parts truck that has been offered if a price is agreed on and im trying to figure out how much of it is actually useful to me. I appreciate you guys help Josh Quote Link to comment https://www.bigmacktrucks.com/topic/73910-rd-specs/page/3/#findComment-548844 Share on other sites More sharing options...
0 880joe Posted March 25 Share Posted March 25 I'm thinking the 38's were made of steel where the 44's were cast iron but someone with more knowledge can correct me if I'm wrong Quote Link to comment https://www.bigmacktrucks.com/topic/73910-rd-specs/page/3/#findComment-548846 Share on other sites More sharing options...
0 Macktruckman Posted March 25 Author Share Posted March 25 Ill have to get by there and look it over again Quote Link to comment https://www.bigmacktrucks.com/topic/73910-rd-specs/page/3/#findComment-548847 Share on other sites More sharing options...
0 JoeH Posted March 26 Share Posted March 26 38's are typically 11r22.5 tires on 5 spoke hubs. 44's and 58's are on 6 spoke hubs IIRC, which are holding 11r24.5 tires. Quote Link to comment https://www.bigmacktrucks.com/topic/73910-rd-specs/page/3/#findComment-548901 Share on other sites More sharing options...
0 Macktruckman Posted March 27 Author Share Posted March 27 These are 6 spoke front and back and all of these trucks were 11R-22.5 rear and 385-65-22.5 fronts. The drop axles all have low pro 22.5 Josh Quote Link to comment https://www.bigmacktrucks.com/topic/73910-rd-specs/page/3/#findComment-548963 Share on other sites More sharing options...
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Macktruckman
Can anyone tell me what the original specs of this truck would be? Thank you
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67RModel
A 690S is Vocational spec with the Maxidyne version of the E6/E7. It will be either 250, 275, or 300 horsepower Maxidyne. And generally have a 6,7, or 8 speed vocational transmission, which is basical
terry
Yes it is a five speed, with three lolo speeds with the main in first, also has a real wide overdrive in fifth for them low geared rears. Terry
880joe
I don't remember if they were 5 or 6 spoke hubs but what I can see of your axle looks like the common 8 bolt used on 38's the heavier axle I've seen used 6 bolt or the cone shaped axles
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