bigmoosemack Posted December 10, 2012 Share Posted December 10, 2012 Hello guys I have a 87 cf mack i need a rearend for im new to all this so can anyone tell me how many different rearends they put in the mack and how to identify without taking the diff apart thanks Quote Link to comment Share on other sites More sharing options...
joes mack Posted December 10, 2012 Share Posted December 10, 2012 did you get it started and back in the station today Quote Link to comment Share on other sites More sharing options...
Lmackattack Posted December 10, 2012 Share Posted December 10, 2012 First find out what rear ratio you have. Or let us know what trans you have and we can suggest a ratio.. There were a lot of options but some will not work well depending on your transmission. Did you want more hi way speed or were you happy with the current top end? Quote Link to comment Share on other sites More sharing options...
Adam Thomas Posted December 10, 2012 Share Posted December 10, 2012 the truck is automatic disc brakes i have no idea what ratio it has we have just bought this truck and know nothing about it just tring to see how many different rearends it had it has six sopke rear if that will help you Quote Link to comment Share on other sites More sharing options...
Adam Thomas Posted December 10, 2012 Share Posted December 10, 2012 the truck is automatic disc brakes i have no idea what ratio it has we have just bought this truck and know nothing about it just tring to see how many different rearends it had it has six sopke rear if that will help youAlso has 10 X 22.5 Tires Quote Link to comment Share on other sites More sharing options...
bulldogboy Posted December 11, 2012 Share Posted December 11, 2012 Looks like Harlan County is cornering the market on "CF" fire engines. That's good; like to see them still in service. I passed through Bristol, VA/TN on I-81 last year; I didn't realize how close I was to Harlan County. Oh, well, maybe next time I'm down that way (would love to go to NASCAR at Bristol). bulldogboy 1 Quote Link to comment Share on other sites More sharing options...
joes mack Posted December 11, 2012 Share Posted December 11, 2012 Bristol is only about 90 miles from evarts Harlan county now has 7 cf trucks that I can think of off the top of my head the one that big moose mack and the one that we have are brother trucks they both came from Essex county nj and the one that evarts fire dept has came from schooleys mtn fire dept in nj and they were sold at the same time. to wynn fire in corbin ky 1 Quote Link to comment Share on other sites More sharing options...
Adam Thomas Posted December 11, 2012 Share Posted December 11, 2012 Looks like Harlan County is cornering the market on "CF" fire engines. That's good; like to see them still in service. I passed through Bristol, VA/TN on I-81 last year; I didn't realize how close I was to Harlan County. Oh, well, maybe next time I'm down that way (would love to go to NASCAR at Bristol). bulldogboyYeah we have 3 with 3 seperate departments. We all make fire calls together so if looks like a mack truck show with water! Quote Link to comment Share on other sites More sharing options...
leversole Posted December 11, 2012 Share Posted December 11, 2012 Didnt notice where you are from! I was born at Benham and went to Cumberland High school...most of my family is in Partridge, Letcher County! Quote Link to comment Share on other sites More sharing options...
Lmackattack Posted December 12, 2012 Share Posted December 12, 2012 Still need to know the final drive of the transmission. You likely have a 300hp diesel with 1:1 final drive. If that's true a 4.17 rear would give you about 62mph at 2300.if that's to slow a 3.87 would give you about 68mph if it's to fast a 5.02 would give you around 55mph and more low end grunt. Some of the other fire truck guys should advise as I just ran dump trucks... 1 Quote Link to comment Share on other sites More sharing options...
joes mack Posted December 12, 2012 Share Posted December 12, 2012 they are from holmesmill leversole they told me today that the truck was speced with a 4.86 I think rear. and it runs about 50/52 mph which is about the same as our cf I can get 55 going down hill lol which is plenty fast enough on our narrow and curvy roads our truck has the 237 and theirs has the 300. Quote Link to comment Share on other sites More sharing options...
fxfymn Posted December 12, 2012 Share Posted December 12, 2012 There may be a tag on the differential housing to id the rear end or you can get the factory build sheet from the museum that will specify which rear was original. If you are in a hurry a phone call to the museum may prove fruitful. Quote Money, sex, and fire; everybody thinks everyone else is getting more than they are! Link to comment Share on other sites More sharing options...
Adam Thomas Posted December 14, 2012 Share Posted December 14, 2012 Still need to know the final drive of the transmission. You likely have a 300hp diesel with 1:1 final drive. If that's true a 4.17 rear would give you about 62mph at 2300.if that's to slow a 3.87 would give you about 68mph if it's to fast a 5.02 would give you around 55mph and more low end grunt. Some of the other fire truck guys should advise as I just ran dump trucks...World Wide Equipment ran the VIN on the Mack and came back with a 4.88 Ratio on the rear end. Quote Link to comment Share on other sites More sharing options...
bigmoosemack Posted December 22, 2012 Author Share Posted December 22, 2012 OK guys thanks for all your help we located a rearend out of another truck and we have it now in our truck filled with oil and done a initial run of it with it still up on blocks no funny noises etc no leakes so not badd for a bunch of rookies huh although i must admit this is alot heavier than regular car parts lol Quote Link to comment Share on other sites More sharing options...
1958 F.W.D. Posted December 24, 2012 Share Posted December 24, 2012 World Wide Equipment ran the VIN on the Mack and came back with a 4.88 Ratio on the rear end.I would want to get confirmation from the Factory on that- they will have ALL of the original build/spec sheets. Quote TWO STROKES ARE FOR GARDEN TOOLS Link to comment Share on other sites More sharing options...
Lmackattack Posted December 24, 2012 Share Posted December 24, 2012 If your trans is direct with a 4.88 looks like it was set up for city use. . If you can get to a 4.17 you will have a 60mph truck at 2100 rpm. Just not as much get up and go. Quote Link to comment Share on other sites More sharing options...
bigmoosemack Posted December 26, 2012 Author Share Posted December 26, 2012 hello folks we found a rearend with a 4.62 ratio it is in and seems to be doing good thanks for all the help Quote Link to comment Share on other sites More sharing options...
fxfymn Posted December 27, 2012 Share Posted December 27, 2012 That's great. I hope the old dog keeps on getting up for you. Quote Money, sex, and fire; everybody thinks everyone else is getting more than they are! Link to comment Share on other sites More sharing options...
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