doubleclutchinweasel Posted May 22, 2013 Share Posted May 22, 2013 My RTF-915 Road Ranger has started grinding when shifting from hi to lo range. It's fine going into hi. I think I've found the most likely part numbers for the synchro unit, gasket kit, & o-ring kit. I've also downloaded the parts and service manuals from Eaton. These pictures are of a device I've built to attach the auxiliary section of the trans to a floor jack to aid r&r, as well as serve as a work bench. Once I get it apart, hopefully I'll be able to verify part numbers & get it shifting smoothly again.At a future date, I'll also need to drop the whole box & put in a clutch. When I do that, I think I'll tear the box down & convert it to an overdrive model. But, that's another story...More pics & updates to follow... Quote "Eagles may soar, but weasels don't get sucked into jet engines." Link to comment https://www.bigmacktrucks.com/topic/31279-road-ranger-hi-lo-synchro-needs-replaced/ Share on other sites More sharing options...
jakebrake86 Posted May 22, 2013 Share Posted May 22, 2013 I need to do mine in my 8LL. It's been grinding from hi to lo ever since I bought the truck 3 years ago. I just try not to knock down into lo unless I'm stopped. Quote Jake Link to comment https://www.bigmacktrucks.com/topic/31279-road-ranger-hi-lo-synchro-needs-replaced/#findComment-184678 Share on other sites More sharing options...
doubleclutchinweasel Posted May 22, 2013 Author Share Posted May 22, 2013 Yeah, that's what I've been doing, too!I hope I find everything else in there in okay shape. Don't want to spend a fortune in there. But, it works now...even downshifts smoothly about half the time. So, I'm hoping it's mostly sound.Anyhow, I'm hoping a complete synchro kit (about $250), a gasket kit (about $35), and an O-ring kit (about $15) will smooth it out.If the rain'll hold off, I'm going to try and tear into it this evening. We'll see... Quote "Eagles may soar, but weasels don't get sucked into jet engines." Link to comment https://www.bigmacktrucks.com/topic/31279-road-ranger-hi-lo-synchro-needs-replaced/#findComment-184751 Share on other sites More sharing options...
RFCDrum Posted May 22, 2013 Share Posted May 22, 2013 Mine is starting to do it in my RT-6613. Cheers, Rob Quote Link to comment https://www.bigmacktrucks.com/topic/31279-road-ranger-hi-lo-synchro-needs-replaced/#findComment-184752 Share on other sites More sharing options...
doubleclutchinweasel Posted May 22, 2013 Author Share Posted May 22, 2013 Hopefully, I can post some pictures of the process soon. Raining too hard right now... Quote "Eagles may soar, but weasels don't get sucked into jet engines." Link to comment https://www.bigmacktrucks.com/topic/31279-road-ranger-hi-lo-synchro-needs-replaced/#findComment-184779 Share on other sites More sharing options...
doubleclutchinweasel Posted May 24, 2013 Author Share Posted May 24, 2013 A few pics of the aux box on the lifting weasel / work stand...and the errant synchro. Looks like the pin shoulders and hole edges are the culprits. I just hope the 4 generations of "superceded by" part numbers are accurate, 'cause I've ordered the new synchro set based on them! Quote "Eagles may soar, but weasels don't get sucked into jet engines." Link to comment https://www.bigmacktrucks.com/topic/31279-road-ranger-hi-lo-synchro-needs-replaced/#findComment-185059 Share on other sites More sharing options...
bbigrig Posted May 25, 2013 Share Posted May 25, 2013 Love the aux box adapter for the jack. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/31279-road-ranger-hi-lo-synchro-needs-replaced/#findComment-185123 Share on other sites More sharing options...
doubleclutchinweasel Posted May 25, 2013 Author Share Posted May 25, 2013 Love the aux box adapter for the jack.Thanks! I was kinda proud of that. I'm gettin' too old to hoss these parts around. Quote "Eagles may soar, but weasels don't get sucked into jet engines." Link to comment https://www.bigmacktrucks.com/topic/31279-road-ranger-hi-lo-synchro-needs-replaced/#findComment-185190 Share on other sites More sharing options...
doubleclutchinweasel Posted May 25, 2013 Author Share Posted May 25, 2013 A few more in-process shots of the aux box adapter weasel. Guess I'll end up building some other system when I need to pull the tranny. Quote "Eagles may soar, but weasels don't get sucked into jet engines." Link to comment https://www.bigmacktrucks.com/topic/31279-road-ranger-hi-lo-synchro-needs-replaced/#findComment-185191 Share on other sites More sharing options...
dds92780 Posted May 25, 2013 Share Posted May 25, 2013 Mine picks and chooses when it wants to grind from hi to low, sometimes at 15mph it doesnt do it and then all a sudden going into low at 5-7mph it will. It isnt that often to make me want to do it asap though. Quote Slow and Steady Wins the Race! Link to comment https://www.bigmacktrucks.com/topic/31279-road-ranger-hi-lo-synchro-needs-replaced/#findComment-185197 Share on other sites More sharing options...
doubleclutchinweasel Posted May 25, 2013 Author Share Posted May 25, 2013 Mine picks and chooses when it wants to grind from hi to low, sometimes at 15mph it doesnt do it and then all a sudden going into low at 5-7mph it will. It isnt that often to make me want to do it asap though.Mine did it worse when it warmed up. Almost flawless when cold. About 50/50 when warmI tested it by rolling along at about 20 mph, in neutral, clutch released. Switch back & forth between high & low.Worked fine going into high, & always ground going into low.I'm hoping this straightens it out... Quote "Eagles may soar, but weasels don't get sucked into jet engines." Link to comment https://www.bigmacktrucks.com/topic/31279-road-ranger-hi-lo-synchro-needs-replaced/#findComment-185202 Share on other sites More sharing options...
theakerstwo Posted May 25, 2013 Share Posted May 25, 2013 When you get it back together check the air pressure. Should be 60 psi Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/31279-road-ranger-hi-lo-synchro-needs-replaced/#findComment-185203 Share on other sites More sharing options...
doubleclutchinweasel Posted May 31, 2013 Author Share Posted May 31, 2013 Everything is back in. Works MUCH better now. A couple of those old air lines still need attention. I'll probably tinker with that a little this weekend. Quote "Eagles may soar, but weasels don't get sucked into jet engines." Link to comment https://www.bigmacktrucks.com/topic/31279-road-ranger-hi-lo-synchro-needs-replaced/#findComment-186111 Share on other sites More sharing options...
doubleclutchinweasel Posted May 31, 2013 Author Share Posted May 31, 2013 The parts used were as follows:Synchronizer Kit: K-3493 (New Rings and New Sliding Clutch)O-Ring Kit: K-1447Gasket Kit: K-2199This K-3493 (formerly K-2447) synchro kit includes the K-2446 kit (improved rings and new springs), and includes the 20336 sliding clutch. This eliminates the trouble of trying to make sure the hub used matches up to the rings used. The 20336 hub has 13 splines. The other hub (20323) has, I believe, 18 splines. I hink that one was found on heavier transmissions. The 20336 replaces the old 16716, and the 20323 replaces the old 16759. The splines in the new hub continue completely through the bore, whereas the original hub in mine only had partial splines, and was relieved the rest of the way through. The new one, therefore, has much more spline engagement.I THINK the K-3491 (formerly K-2445) synchro kit MIGHT have fit the old hub, but don't quote me on that. I felt it wasn't worth fooling around with the old hub, considering the difference in the kit prices. Besides, now i have current parts!The O-ring kit and gasket kit were dirt-cheap, and were actually cheaper then just buying the handful of gaskets and O-rings actually needed. So, that one was a no-brainer! Quote "Eagles may soar, but weasels don't get sucked into jet engines." Link to comment https://www.bigmacktrucks.com/topic/31279-road-ranger-hi-lo-synchro-needs-replaced/#findComment-186145 Share on other sites More sharing options...
doubleclutchinweasel Posted June 1, 2013 Author Share Posted June 1, 2013 Replaced the leaky rubber hoses on the transmission with tubing this morning. No more leaks! Maybe get some pics this afternoon. Quote "Eagles may soar, but weasels don't get sucked into jet engines." Link to comment https://www.bigmacktrucks.com/topic/31279-road-ranger-hi-lo-synchro-needs-replaced/#findComment-186341 Share on other sites More sharing options...
doubleclutchinweasel Posted June 1, 2013 Author Share Posted June 1, 2013 All them there shiny new bolts sure make it look purty! 2 Quote "Eagles may soar, but weasels don't get sucked into jet engines." Link to comment https://www.bigmacktrucks.com/topic/31279-road-ranger-hi-lo-synchro-needs-replaced/#findComment-186343 Share on other sites More sharing options...
felicello122 Posted June 1, 2013 Share Posted June 1, 2013 You should market that weasel tool you made, I would buy one! Quote Link to comment https://www.bigmacktrucks.com/topic/31279-road-ranger-hi-lo-synchro-needs-replaced/#findComment-186363 Share on other sites More sharing options...
doubleclutchinweasel Posted June 1, 2013 Author Share Posted June 1, 2013 You should market that weasel tool you made, I would buy one!Thanks! It's nice to be appreciated for your weaseliness!Kent 1 Quote "Eagles may soar, but weasels don't get sucked into jet engines." Link to comment https://www.bigmacktrucks.com/topic/31279-road-ranger-hi-lo-synchro-needs-replaced/#findComment-186372 Share on other sites More sharing options...
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