xdudebrahx Posted October 3, 2012 Share Posted October 3, 2012 Between a 1986 rd686sx and a 1988 rd690s? My work has a few of each type and I'm just curious of the differences. Oh, and don't say 2 years Quote Link to comment Share on other sites More sharing options...
1958 F.W.D. Posted October 3, 2012 Share Posted October 3, 2012 Between a 1986 rd686sx and a 1988 rd690s? My work has a few of each type and I'm just curious of the differences. Oh, and don't say 2 years 24 months............... 1 Quote TWO STROKES ARE FOR GARDEN TOOLS Link to comment Share on other sites More sharing options...
41chevy Posted October 3, 2012 Share Posted October 3, 2012 I believe (at least on the earlier R's) the 686 calls out an ENDT 676 engine and the 690 is a later code for all Maxidyne 6 cylinder engines. S was for a 6 wheel chassis and X was for severe duty chassis.......Course I'm probably wrong.. Oh and it's 730 days difference Quote "OPERTUNITY IS MISSED BY MOST PEOPLE BECAUSE IT IS DRESSED IN OVERALLS AND LOOKS LIKE WORK" Thomas Edison “Life’s journey is not to arrive at the grave safely, in a well preserved body, but rather to skid in sideways, totally worn out, shouting ‘Holy shit, what a ride!’” P.T.CHESHIRE Link to comment Share on other sites More sharing options...
JTFormula Posted October 3, 2012 Share Posted October 3, 2012 8 changes of seasons? Quote ~ JT Burkard ~ AKA Sweaty Mackwww.jtresto.com www.wickedreputation.netwww.jonathanthomasmotorcars.com Link to comment Share on other sites More sharing options...
Apple dog Posted October 3, 2012 Share Posted October 3, 2012 104 weeks Quote This is Mack country. On a quiet night you can hear a peterbilt rust away. Link to comment Share on other sites More sharing options...
rsb502 Posted October 4, 2012 Share Posted October 4, 2012 Aww hell Ill do it, 2 years! The two are basically the same truck just differences of year model options, like engine and chassis designation as severe duty, however I have been wrong before. Quote "Any Society that would give up a little LIBERTY to gain a little SECURITY will Deserve Neither and LOSE BOTH" -Benjamin Franklin"If your gonna be STUPID, you gotta be TOUGH" "You cant always get what you want, but if you try sometimes you get what you need" Link to comment Share on other sites More sharing options...
slpwlker Posted October 4, 2012 Share Posted October 4, 2012 oh 17472 hours Quote Link to comment Share on other sites More sharing options...
terry Posted October 4, 2012 Share Posted October 4, 2012 686 Would be a 285 with a 5 or 6 spd, a 690 would be a 300 or350 with a 9 spd mack or fuller. Terry Quote Link to comment Share on other sites More sharing options...
JumperAndSon Posted October 4, 2012 Share Posted October 4, 2012 1,048,320 minutes Ben Quote Link to comment Share on other sites More sharing options...
David Posted October 4, 2012 Share Posted October 4, 2012 You all forgot '88 was a leap year. Quote Link to comment Share on other sites More sharing options...
rick harper Posted October 4, 2012 Share Posted October 4, 2012 The main difference is in the axle ratings. RD690S the biggest rear bogie was 44 thousand. SX 52000 up to 80000 bogies. Quote Link to comment Share on other sites More sharing options...
Superdog Posted October 4, 2012 Share Posted October 4, 2012 When Mack went away from it's old number/engine code,the 690 covered the Maxidyne family of 6 cylinder engines,and 688 (which used to be the code for the E6-350) covered the Econodyne family of engines.686 was the old code for aENDT676 "300 series" Maxidyne,and later also covered the E6-285 and EM6-300 before it was dropped in favor of the 690 code. Quote Link to comment Share on other sites More sharing options...
xdudebrahx Posted October 4, 2012 Author Share Posted October 4, 2012 Hahah I was asking for that.Both trucks in question are Tri-axles. The 690s have T2070 maxi torques and the 686sx's have the 5 speed two stick.I gotta check the door tags to see what the rears are on the 690's are, because they're definitely different (flat axle cover and more squarish spokes). The 690s also have eaton air lockers, but I guess they can be aftermarket?So basically the only thing different was engine, trans, and rears. Thanks for the info. I'm only 24 but I like to learn about the old stuff I get to drive. Quote Link to comment Share on other sites More sharing options...
David Posted October 4, 2012 Share Posted October 4, 2012 Interesting how at 24 you're young but the truck is old. Quote Link to comment Share on other sites More sharing options...
xdudebrahx Posted October 4, 2012 Author Share Posted October 4, 2012 It's one year older than me, allow me to feel youthful! Quote Link to comment Share on other sites More sharing options...
41chevy Posted October 5, 2012 Share Posted October 5, 2012 It's one year older than me, allow me to feel youthful!You are youthful compared to most of the grey beards here.....'cept me Quote "OPERTUNITY IS MISSED BY MOST PEOPLE BECAUSE IT IS DRESSED IN OVERALLS AND LOOKS LIKE WORK" Thomas Edison “Life’s journey is not to arrive at the grave safely, in a well preserved body, but rather to skid in sideways, totally worn out, shouting ‘Holy shit, what a ride!’” P.T.CHESHIRE Link to comment Share on other sites More sharing options...
xdudebrahx Posted October 5, 2012 Author Share Posted October 5, 2012 I'm the youngest driver at my company and we have a bunch of newer trucks. People look at me like I'm crazy when they see me cleaning up my old 86 lol 1 Quote Link to comment Share on other sites More sharing options...
burnstransport Posted October 5, 2012 Share Posted October 5, 2012 I spent some time as a driver supervisor, trust me, you'll go far if you keep cleaning the old trucks. Don't let anyone get you down about it, smile at being the butt of the jokes from the other drivers because most likely your bosses DO notice your extra effort and enthusiasm! Best of luck! Quote Link to comment Share on other sites More sharing options...
Lmackattack Posted October 5, 2012 Share Posted October 5, 2012 sounds like they will be very similar to drive.,Macks with a 2070 commonly had that big overdrive but slow rear gears,your max speed was in the 62-68 MPH. same goes with the 2 stick 6 speed. direct trans and 4.17 rears made it a 62MPH truck. Personly I like the 2 stick out of those 2 transmissions. the 2070 was kinda weird. sometimes with a normal load you needed to take off in the low side other times not. where the 2 stick 6 speed would just about walk away in 1st direct all the time.and good on ya for looking after them old trucks. learn to drive one of them and you become a real trucker that stands above the rest. Quote Link to comment Share on other sites More sharing options...
xdudebrahx Posted October 5, 2012 Author Share Posted October 5, 2012 The first truck I learned on was a 6 speed 2 stick. I prefer it over the 2070 by far. We do a lot of work in center city Philly where you need low end grunt, and the trucks with the 2070s are a pain, especially on hills. Quote Link to comment Share on other sites More sharing options...
Lmackattack Posted October 6, 2012 Share Posted October 6, 2012 yep.... thats exactly why I did not like them. to slow in the first 2 gears for anything on road... then all the big steps afterwards. ever driven a 12 speed..... those are perfect for all your needs. Quote Link to comment Share on other sites More sharing options...
terry Posted October 6, 2012 Share Posted October 6, 2012 yep.... thats exactly why I did not like them. to slow in the first 2 gears for anything on road... then all the big steps afterwards. ever driven a 12 speed..... those are perfect for all your needs. Best tranny mack ever made! Terry Quote Link to comment Share on other sites More sharing options...
rsb502 Posted October 6, 2012 Share Posted October 6, 2012 yep.... thats exactly why I did not like them. to slow in the first 2 gears for anything on road... then all the big steps afterwards. ever driven a 12 speed..... those are perfect for all your needs.MMMM...trtxl 1070, why did they stop making that awesome piece of mechanical achievement, I dont think I ever found a speed or a load I couldnt get into the power band with that thing and some 4.42 rears. Quote "Any Society that would give up a little LIBERTY to gain a little SECURITY will Deserve Neither and LOSE BOTH" -Benjamin Franklin"If your gonna be STUPID, you gotta be TOUGH" "You cant always get what you want, but if you try sometimes you get what you need" Link to comment Share on other sites More sharing options...
xdudebrahx Posted October 8, 2012 Author Share Posted October 8, 2012 We have an old R600 and a Superliner that both have 12 speeds in them. I'd love to get to drive them some day. Quote Link to comment Share on other sites More sharing options...
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