dds92780 Posted October 6, 2015 Share Posted October 6, 2015 Hey guys. My truck has 480k on it now. Its an r model and I like the mechanical engine but lately the trans has really been bothering me. For instance when I come to stop and I have to engage reverse there is always a loud popping sound once the clutch is released. It also does the sound when I let off the gas too quick. The rest of the transmission shifts fine but it doesn't shift like butter. it doesn't shift as fast as I would like it to. Every time I load it on a job site and I come to a stop and I have to back up it was made that popping sound so if I have to pull forward again it does this sound again if I have to go in reverse it does the sound again it's almost like the transmission doesn't like making the change from forward to reverse even though I'm at a complete stop.This is been going on for a few months now and only seems to be getting a little worse even when I'm trying to drive and engage gears smoothly it's almost like the fifth wheel has play in it and if I don't push the pedal down gently it wants to jerk me a little bit I don't think it's related but it's just another thing I'm not liking about the whole transmission of the truckI have taken it to my mechanic and all we've done so far is drained the transmission fluid and it came out clean I have talked to the owner of Christensen trucking and he says that the automatic power dividers go out sometimes and there are peanuts inside there that go bad and can cause the sound. I kind of agree with that but the sound clearly sounds gets coming from the front of the truck my next step was to take it to the mechanic and drain the power divider fluid and see if any metal shavings come out we have already checked all the U bolts and mounts and they are fine. the solution that my mechanic has is that I'm going to need a new transmission by the end of the year so my dilemma is do I put money into this truck and get a rebuilt 9 speed or do I put more money into it and get a 13 speed like I've always wanted that's built for the amount of torque that I'm making what all needs to be done to get a 13 speed into the trunk is it as simple as getting the 13 speed and lengthening the drive shaft?My other thought was to move on and buy a nice 379 Peterbilt but I'm sure you guys would like me to stay around so help me stay in the Mack Quote Slow and Steady Wins the Race! Link to comment https://www.bigmacktrucks.com/topic/42081-rtxf1409b-9-speed-trans-problems-help/ Share on other sites More sharing options...
dds92780 Posted October 6, 2015 Author Share Posted October 6, 2015 Sorry trans is a rtxf14609b. What all is involved to go to rtlof14713a trans? Quote Slow and Steady Wins the Race! Link to comment https://www.bigmacktrucks.com/topic/42081-rtxf1409b-9-speed-trans-problems-help/#findComment-306457 Share on other sites More sharing options...
RedBullDog Posted October 6, 2015 Share Posted October 6, 2015 By the way you describe it, it sounds like the troubles may be in the rear end and not the transmission. I had many of the same problems you have in a previous truck, and the gear in the front rear carrier had 2 broken teeth. Rear problems can move up the driveline and pretend to be a trans problem. 2 Quote Link to comment https://www.bigmacktrucks.com/topic/42081-rtxf1409b-9-speed-trans-problems-help/#findComment-306462 Share on other sites More sharing options...
terry Posted October 6, 2015 Share Posted October 6, 2015 Double check the rears, I have seen guys rebuild a trans. when it was a rear end problem! terry 1 Quote Link to comment https://www.bigmacktrucks.com/topic/42081-rtxf1409b-9-speed-trans-problems-help/#findComment-306465 Share on other sites More sharing options...
theakerstwo Posted October 7, 2015 Share Posted October 7, 2015 Another thing about the trans, it could be full of metal chunks and not drain out with the oil.It has magnets in the bottom that holds the steel chunks like teeth and brgs.But like said it could be in the rears.All rear end noise will come up the drive line. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/42081-rtxf1409b-9-speed-trans-problems-help/#findComment-306494 Share on other sites More sharing options...
dds92780 Posted October 7, 2015 Author Share Posted October 7, 2015 Okay so I talked to my mechanic and we are going to drain bolt rear ends in the power divider to come up with an idea of what's going on and come up with a solution I tried to let the truck roll down a hill without using the clutch to get it into reverse and even though I managed to get it in gear while rolling as soon as I let off on the gas a little bit and makes the same popping sound.Other than that the truck drives fine and the transmission shifts the way it should I just don't know what it could be at this point Quote Slow and Steady Wins the Race! Link to comment https://www.bigmacktrucks.com/topic/42081-rtxf1409b-9-speed-trans-problems-help/#findComment-306546 Share on other sites More sharing options...
bts-4120 Posted October 8, 2015 Share Posted October 8, 2015 ever thought about jacking it up and setting it on tall blocks so you could run threw the gears a tooth off a rear end will vibrate into the cab and sound like a trans Quote Link to comment https://www.bigmacktrucks.com/topic/42081-rtxf1409b-9-speed-trans-problems-help/#findComment-306673 Share on other sites More sharing options...
afrdiesel Posted October 9, 2015 Share Posted October 9, 2015 drain rear ends and transmission, what type of rear ends you run? also the range syncro could be an issue. simply go from the cheapest way first all the way up to the costly one, you could also remove the shift bar housing of the tranny to inspect the main case to see if there are missing or broken teeth on the gears. Quote Link to comment https://www.bigmacktrucks.com/topic/42081-rtxf1409b-9-speed-trans-problems-help/#findComment-306698 Share on other sites More sharing options...
gearhead204 Posted October 9, 2015 Share Posted October 9, 2015 also have you checked the slip yokes? you may have a splined yoke about to fail. have you went for a test drive with a mechanic? I would hook to a flat bed and have them lay on it and then see if they can see or hear any strange stuff, as mentioned before running the truck while on blocks can also help to trouble shoot the failed area. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/42081-rtxf1409b-9-speed-trans-problems-help/#findComment-306703 Share on other sites More sharing options...
dds92780 Posted October 9, 2015 Author Share Posted October 9, 2015 Got under the truck today with a guy that works for nagel trucking. We came to the. Conclusion that it needs a new carrier bearing. We accomplished this by leaving truck park and slowly releasing the clutch. The sound would violently come on. Quote Slow and Steady Wins the Race! Link to comment https://www.bigmacktrucks.com/topic/42081-rtxf1409b-9-speed-trans-problems-help/#findComment-306709 Share on other sites More sharing options...
mrsmackpaul Posted October 9, 2015 Share Posted October 9, 2015 Hmm I have only just stumbled across this sounds like something is wrong with the tail shaft uni's crook spline and as you said above the carrier bearing sounds like the shaft is winding up a bit before it drives if that makes any sensePaul Quote Link to comment https://www.bigmacktrucks.com/topic/42081-rtxf1409b-9-speed-trans-problems-help/#findComment-306735 Share on other sites More sharing options...
dds92780 Posted October 10, 2015 Author Share Posted October 10, 2015 Turned out that the splines on drive shaft and yoke were pretty worn out. I am getting the drive shaft rebuilt monday. Quote Slow and Steady Wins the Race! Link to comment https://www.bigmacktrucks.com/topic/42081-rtxf1409b-9-speed-trans-problems-help/#findComment-306892 Share on other sites More sharing options...
dds92780 Posted October 13, 2015 Author Share Posted October 13, 2015 I fixed the problem by taking my drive shaft over to midwest drive shaft and having it all rebuilt. Quote Slow and Steady Wins the Race! Link to comment https://www.bigmacktrucks.com/topic/42081-rtxf1409b-9-speed-trans-problems-help/#findComment-307272 Share on other sites More sharing options...
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