LAZRGUIRA Posted May 12, 2011 Share Posted May 12, 2011 (edited) Hi all.. I have a bit of a problem.. I have a 1986 Mack superliner withE6-350Camel Back deep reduction 4.42'sFuller 9 speed RT14609AREAR END RATIO 4.42 RPM SPEED 2100 TIRE SIZE 24.5 CURRENT TOP SPEED 59.89 MPH My proble is that i cant keep up with the rest of the flock (dump trucks). There all doing 64-70 mph and i'm stuck at 55-60 mph. what can i do to fix this problem? I'm looking hard at a RTLO 14713A or RTLO 16913A 13 speed . I really don't think that tapping in to the the rear ends is a good idea...probly PRICEY any advice would be EXTREMELY appreciated... The truck has been fully restored with a completely rebuilt engine ... oh and i'm also looking for an air ride cab conversion kit too...thx Edited May 12, 2011 by LAZR GUIRA Quote Link to comment https://www.bigmacktrucks.com/topic/19057-my-superliner-is-slow/ Share on other sites More sharing options...
Bollweevil Posted May 12, 2011 Share Posted May 12, 2011 Hi all.. I have a bit of a problem.. I have a 1986 Mack superliner withE6-350Camel Back deep reduction 4.42'sFuller 9 speed RT14609AREAR END RATIO 4.42 RPM SPEED 2100 TIRE SIZE 24.5 CURRENT TOP SPEED 59.89 MPH My proble is that i cant keep up with the rest of the flock (dump trucks). There all doing 64-70 mph and i'm stuck at 55-60 mph. what can i do to fix this problem? I'm looking hard at a RTLO 14713A or RTLO 16913A 13 speed . I really don't think that tapping in to the the rear ends is a good idea...probly PRICEY any advice would be EXTREMELY appreciated... The truck has been fully restored with a completely rebuilt engine ... oh and i'm also looking for an air ride cab conversion kit too...thx The 14609A is a direct, or 1 to 1, you need a 14609B which is a .73 overdrive. you would still have a reasonably low first gear, and it is common enough to be reasonably priced. An 8LL would be even better, you could have the same overdrive ratio, and deep reduction. They are somewhat pricey though. Quote Link to comment https://www.bigmacktrucks.com/topic/19057-my-superliner-is-slow/#findComment-77715 Share on other sites More sharing options...
slpwlker Posted May 12, 2011 Share Posted May 12, 2011 The 14609A is a direct, or 1 to 1, you need a 14609B which is a .73 overdrive. you would still have a reasonably low first gear, and it is common enough to be reasonably priced. An 8LL would be even better, you could have the same overdrive ratio, and deep reduction. They are somewhat pricey though.Could try a 15 speed. which is a 10 speed with a deep reduction. Just not sure you'd have enough motor to pull it in 10th Quote Link to comment https://www.bigmacktrucks.com/topic/19057-my-superliner-is-slow/#findComment-77716 Share on other sites More sharing options...
theakerstwo Posted May 12, 2011 Share Posted May 12, 2011 What ever he gets its got to be a RTO something. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/19057-my-superliner-is-slow/#findComment-77718 Share on other sites More sharing options...
David Posted May 13, 2011 Share Posted May 13, 2011 What ever he gets its got to be a RTO something.Or a T2090. That would be .71 overdrive. Quote Link to comment https://www.bigmacktrucks.com/topic/19057-my-superliner-is-slow/#findComment-77730 Share on other sites More sharing options...
Lmackattack Posted May 13, 2011 Share Posted May 13, 2011 the 8ll is a great trans parts are easy but a little priceymack 9 speeds are good but have known clutch pack issues. first think I would do is replace that clutch pack.13 speeds will have all the gears you want but not as deep reduction in the lower gears as a 8ll. any of these transmissions will put you around 75MPH+ Quote Link to comment https://www.bigmacktrucks.com/topic/19057-my-superliner-is-slow/#findComment-77732 Share on other sites More sharing options...
LAZRGUIRA Posted May 13, 2011 Author Share Posted May 13, 2011 the 8ll is a great trans parts are easy but a little priceymack 9 speeds are good but have known clutch pack issues. first think I would do is replace that clutch pack.13 speeds will have all the gears you want but not as deep reduction in the lower gears as a 8ll. any of these transmissions will put you around 75MPH+Thanks alot guys... Quote Link to comment https://www.bigmacktrucks.com/topic/19057-my-superliner-is-slow/#findComment-77771 Share on other sites More sharing options...
swjr Posted September 24, 2011 Share Posted September 24, 2011 (edited) Hi all.. I have a bit of a problem.. I have a 1986 Mack superliner withE6-350Camel Back deep reduction 4.42'sFuller 9 speed RT14609AREAR END RATIO 4.42 RPM SPEED 2100 TIRE SIZE 24.5 CURRENT TOP SPEED 59.89 MPH My proble is that i cant keep up with the rest of Links:90 international, 3406b cat, won't run more than 60mph help ...www.thedieselstop.com › ... › Other Topics › General Diesel - Cached16 posts - 5 authors - Last post: Jun 10, 2007oh well nevre, what do u think will give me a little pass boost? ... You will have to find atleast anRTO12513 and possibly an RTOO12513. The RTOO is a double overdrive and would get you speed up to where you want it. ...the flock (dump trucks). There all doing 64-70 mph and i'm stuck at 55-60 mph. what can i do to fix this problem? I'm looking hard at a RTLO 14713A or RTLO 16913A 13 speed . I really don't think that tapping in to the the rear ends is a good idea...probly PRICEY any advice would be EXTREMELY appreciated... The truck has been fully restored with a completely rebuilt engine ... oh and i'm also looking for an air ride cab conversion kit too...thxAn RTOO 12513 / 14613 rebuilt exchange will do the trick. This gives you 3 overdrives and will give you about v=75 mph @ 1700 rpm in 13th. or about v=89 mph @ 1934.90509333 rpm This is cheap and it works.good luck Edited September 25, 2011 by swjr Quote Link to comment https://www.bigmacktrucks.com/topic/19057-my-superliner-is-slow/#findComment-86853 Share on other sites More sharing options...
swjr Posted September 25, 2011 Share Posted September 25, 2011 (edited) Or a T2090. That would be .71 overdrive.it needs to be a T2050 / 2060 which is a .60 OD.The RTOO 12513 / 14613 can be had exchange saving him some serious cash. here is a guy in chi town:3835 W. 42nd StreetChicago, IL 60632Toll Free • 888-481-2514http://eotruckandtrailer.com/sections/products/Transmissions?product=70Phone • 773-696-2008 Fax • 773-247-2632info@generaltruckparts.com Edited September 25, 2011 by swjr Quote Link to comment https://www.bigmacktrucks.com/topic/19057-my-superliner-is-slow/#findComment-86906 Share on other sites More sharing options...
swjr Posted September 25, 2011 Share Posted September 25, 2011 i am having issues posting. one message will not post, then the next one does. any help ? Quote Link to comment https://www.bigmacktrucks.com/topic/19057-my-superliner-is-slow/#findComment-86907 Share on other sites More sharing options...
swjr Posted September 25, 2011 Share Posted September 25, 2011 I cant edit my posts, so try: eotruckandtrailer.com Quote Link to comment https://www.bigmacktrucks.com/topic/19057-my-superliner-is-slow/#findComment-86912 Share on other sites More sharing options...
LAZRGUIRA Posted October 16, 2011 Author Share Posted October 16, 2011 The 14609A is a direct, or 1 to 1, you need a 14609B which is a .73 overdrive. you would still have a reasonably low first gear, and it is common enough to be reasonably priced. An 8LL would be even better, you could have the same overdrive ratio, and deep reduction. They are somewhat pricey though.Ok so i took your advise on the RTX-14609B. We swaped them out yesterday. My mechanic tells me that he's having trouble getting it in to gear from a stand still.He thinks it could either be 2 things.1) the clutch pressure plate being bad or wrong clutch to begin with.2) or the fly wheel is under spec and has to be replaced.Can you please tell me what is the proper clutch for my application? I called mack and gave them my specs and they recammended the clutch we put in. I'll get that # for you soon. All i know is that it was a 14" ,4 paddle ,8 springs with 1400-1450 pounds of torque.I have a glider kit so my VIN will be usless.ENGINE 239GB5450P2 MACK E6-350NEW TRANS RTX-14609BAny info would be greatly appreciated guys. Quote Link to comment https://www.bigmacktrucks.com/topic/19057-my-superliner-is-slow/#findComment-88625 Share on other sites More sharing options...
LAZRGUIRA Posted October 16, 2011 Author Share Posted October 16, 2011 (edited) Ok.. heres the clutch Mack recammended. Is this the correct one?EATON 108050-59b Edited October 16, 2011 by LAZR GUIRA Quote Link to comment https://www.bigmacktrucks.com/topic/19057-my-superliner-is-slow/#findComment-88627 Share on other sites More sharing options...
LAZRGUIRA Posted October 17, 2011 Author Share Posted October 17, 2011 anyone? Quote Link to comment https://www.bigmacktrucks.com/topic/19057-my-superliner-is-slow/#findComment-88696 Share on other sites More sharing options...
rhasler Posted October 17, 2011 Share Posted October 17, 2011 If it's a 14" clutch the intermediate plate may be binding against the clutch dogs (drive lugs) that are driven into the flywheel. Quote "Mebbe I'm too ugly and stupid to give up!" Link to comment https://www.bigmacktrucks.com/topic/19057-my-superliner-is-slow/#findComment-88699 Share on other sites More sharing options...
swjr Posted October 18, 2011 Share Posted October 18, 2011 (edited) the 8ll is a great trans parts are easy but a little priceymack 9 speeds are good but have known clutch pack issues. first think I would do is replace that clutch pack.13 speeds will have all the gears you want but not as deep reduction in the lower gears as a 8ll. any of these transmissions will put you around 75MPH+With 4.42 rears, you dont need a deep reduction. it will pull a house with a 13 OOD and never flinch.as far as the clutch issues, I can look into it, but I am not sure I can be of any timley help. - My understanding is that clutch mountings are universal, with the exception of over mount or under mount clutch arms. You should, for example be able to add a 15" clutch with no problem. Hmmmmmm.......... Edited October 18, 2011 by swjr Quote Link to comment https://www.bigmacktrucks.com/topic/19057-my-superliner-is-slow/#findComment-88805 Share on other sites More sharing options...
shortstack Posted October 18, 2011 Share Posted October 18, 2011 I assume it has a clutch brake and it's adjusted and working? Trey Quote Link to comment https://www.bigmacktrucks.com/topic/19057-my-superliner-is-slow/#findComment-88807 Share on other sites More sharing options...
LAZRGUIRA Posted October 19, 2011 Author Share Posted October 19, 2011 Problem solved..Flywheel needed additional machining....Everythings perfect now....thanks . That 9 speed overdrive really made a big difference...I'm loving it!!! Quote Link to comment https://www.bigmacktrucks.com/topic/19057-my-superliner-is-slow/#findComment-88912 Share on other sites More sharing options...
swjr Posted October 25, 2011 Share Posted October 25, 2011 (edited) Problem solved..Flywheel needed additional machining....Everythings perfect now....thanks . That 9 speed overdrive really made a big difference...I'm loving it!!!you just added about 20 mph to your truck.When you get to where you can overhaul it, you can get the RTOO kit and you will add top end and will be able to run far fewer rpm's, which will save you about 1.5 mpg.Also, adding 300 BHP to your engine will put more money in your bank.EDIT: I checked out your set up, and guessed your current tyre size and your runnunig just about 1975 rpm @v=75 mph. If you were to go with an RTOO, t200 (.60), or a RBS (.64) trans mission, you would be able to still have a .73 OD (as opposed to th RTO 14609's .74 OD) and you can have the .62 OD which would allow you to run v=75 mph @about 1650 rpm. Saving you a ton of cash in fuel costs. Coincidently, the fuel savings would buy you 3 of these RTOO transmissions hands down. Plus the truck would run at around 100 mph (perhaps a little less) and give you the best of both worlds.I was up all night and got home from the doctor pretty late, so I hope I didn't miss anything. I'm here to help. lol.Good luck!! Edited October 26, 2011 by swjr Quote Link to comment https://www.bigmacktrucks.com/topic/19057-my-superliner-is-slow/#findComment-89421 Share on other sites More sharing options...
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