I had wondered forever why that is, but I have figured it out through many hours of research as almost every typical automatic transmission I’ve heard does this same thing. Essentially, there are two or more planetary gearsets in an auto trans (if you have 6 gears, you have 3 gearsets; 8 gears is likely 4 gearsets), the first gearset will spin the opposite direction of the output shaft on the transmission. The reason you don’t go backwards is because any gearset placed after the first one will spin the same direction as the output shaft. The first gearset spinning opposite causes a whine noise. It’s perfectly normal. Every GM HydraMatic trans and Chrysler trans and even some Ford trans (Crown Vic’s I’m looking at you) do it. It’s just the nature of its design. I had a 2014 Sierra and the 6L80 in it had a very loud and my buddies would always joke that it’s the turbo spooling up when I would give enough throttle for it to shift to second around 3 and a half grand, by which point the whine is on a pitch similar to that of a straight cut reverse gear or a turbo at low boost. If you go back to the part where you come to a stop, when it shifts from second to first, you not only notice the tach rise maybe 100rpm and if you listen close you hear that whine blip before you come to a complete stop. That’s the first gearset changing to spin the opposite direction. I’ve gotten used to it and find it amusing nowadays, maybe I’m weird like that but that’s just me.
I had the same problem. The noise you are experiencing is the main pinion bearing going out. I replaced all the bearings in the rear differential. Once you're in there you might as well do the job right the first time. The noise is caused by the type of material that's used in the bearings. It degrades rapidly after 75K. The front differential will likely have to be replaced at some point, I've decided to wait until they start going south before I invest another $700.
is this for sure what the problem is mine also makes that howling noise but it is combined with a slight vibration I can feel in the steering column around 40 to 45 miles per hour.
@@bartekmrozik so no joke, my problem was the tires. Shocks were bad and caused tires to bow in slightly so they were wearing unevenly and bouncing slightly which caused an uneven wear pattern giving the tires a slight octogonal shape. Replaced shocks and tired and that fixed the problem.
As far as I've read, it's just an annoyance. The variances in the machining of the gears and normal wear and tear makes the meshing gears a little more noisy than others. Some have said changing the fluid can help but I have yet to try this. Check out this forum. The first post describes exactly what this video shows: www.jeepforum.com/forum/f9/transmission-whine-99-sahara-auto-389649/
After a lot of research and q&a, I'm pretty sure it's the 1st gear planetary pinions that are whining. Google "Jeep planetary gear whine". It doesn't seem like it's too big a problem. More an annoyance. Basically, when in 1st gear, the front planets spin at a higher rate than the engine RPM (underdrive) as power is input from the front sun gear. Once 2nd gear kicks in, the rear annulus is released and, although the front planets are still spinning, their rotations are now lessened by the now free-spinning annulus. If you listen carefully while in 2nd, you can still hear the whine, albeit at a slower rate of pitch increase. Once 3rd gear kicks in, all the gears are locked in place and the whole system spins as one (for a 1:1 ratio), therefore no whine. And in 4th gear (overdrive) the overdrive gear is now handling the input power.
Did you figure this one out? I have the same noise, changed the transmission and it is still there. Everyone says its normal, but when the same car takes off next to me I haven't heard it.
Nope. I just learned to live with it. Some libertys do it. Some don't. It's the 42RLEs pinion gears. It's never got louder or worse. It's just there. I think you hear it more from the inside because it's quiet on the inside and the transmission sits pretty much right under the center console.
I have a 2010 Liberty and mine does it too. I have a friend with a liberty and she’s does it as well. I had mine since buying it brand new and since day 1 it’s done it. I’m sure it’s normal
I had wondered forever why that is, but I have figured it out through many hours of research as almost every typical automatic transmission I’ve heard does this same thing. Essentially, there are two or more planetary gearsets in an auto trans (if you have 6 gears, you have 3 gearsets; 8 gears is likely 4 gearsets), the first gearset will spin the opposite direction of the output shaft on the transmission. The reason you don’t go backwards is because any gearset placed after the first one will spin the same direction as the output shaft. The first gearset spinning opposite causes a whine noise. It’s perfectly normal. Every GM HydraMatic trans and Chrysler trans and even some Ford trans (Crown Vic’s I’m looking at you) do it. It’s just the nature of its design. I had a 2014 Sierra and the 6L80 in it had a very loud and my buddies would always joke that it’s the turbo spooling up when I would give enough throttle for it to shift to second around 3 and a half grand, by which point the whine is on a pitch similar to that of a straight cut reverse gear or a turbo at low boost.
If you go back to the part where you come to a stop, when it shifts from second to first, you not only notice the tach rise maybe 100rpm and if you listen close you hear that whine blip before you come to a complete stop. That’s the first gearset changing to spin the opposite direction. I’ve gotten used to it and find it amusing nowadays, maybe I’m weird like that but that’s just me.
I have the same Jeep Liberty. It's just what the transmission does. Mine did it too right off the lot.
My mom had a 2012 liberty that made that exact noise. Kinda nostalgic to me lol. But its fine, thats just the noise they make
PROBLEM SOLVED ?
torque Converter ? Or maybe berings
? i have the same....
And I just want to add I have a friend with a 2010 Jeep Liberty and hers does it too. It's just the Jeep Liberty noice.
PROBLEM SOLVED ?
torque Converter ? Or maybe berings
? i have the same....
I had the same problem. The noise you are experiencing is the main pinion bearing going out. I replaced all the bearings in the rear differential. Once you're in there you might as well do the job right the first time. The noise is caused by the type of material that's used in the bearings. It degrades rapidly after 75K. The front differential will likely have to be replaced at some point, I've decided to wait until they start going south before I invest another $700.
is this for sure what the problem is mine also makes that howling noise but it is combined with a slight vibration I can feel in the steering column around 40 to 45 miles per hour.
@@SandShark350 PROBLEM SOLVED ?
torque Converter ? Or maybe berings
? i have the same....
@@bartekmrozik so no joke, my problem was the tires. Shocks were bad and caused tires to bow in slightly so they were wearing unevenly and bouncing slightly which caused an uneven wear pattern giving the tires a slight octogonal shape. Replaced shocks and tired and that fixed the problem.
@@bartekmrozik u got way to much time on your hands shit bag.
I have same issue with my jeep 2012 Cherokee and also am hearing same sound between 90and 100 km /h ....did you found what's the problem????
PROBLEM SOLVED ?
torque Converter ? Or maybe berings
? i have the same....
so is this something that need fixing. or its something that all jeeps do. mine does the same exact thing.
As far as I've read, it's just an annoyance. The variances in the machining of the gears and normal wear and tear makes the meshing gears a little more noisy than others. Some have said changing the fluid can help but I have yet to try this. Check out this forum. The first post describes exactly what this video shows: www.jeepforum.com/forum/f9/transmission-whine-99-sahara-auto-389649/
@@vegajay PROBLEM SOLVED ?
torque Converter ? Or maybe berings
? i have the same....
Dude I have the same problem with transmissions F40-6. Can share what the problem is
After a lot of research and q&a, I'm pretty sure it's the 1st gear
planetary pinions that are whining. Google "Jeep planetary gear whine".
It doesn't seem like it's too big a problem. More an annoyance.
Basically, when in 1st gear, the front planets spin at a higher rate
than the engine RPM (underdrive) as power is input from the front sun
gear. Once 2nd gear kicks in, the rear annulus is released and, although
the front planets are still spinning, their rotations are now lessened
by the now free-spinning annulus. If you listen carefully while in 2nd,
you can still hear the whine, albeit at a slower rate of pitch increase.
Once 3rd gear kicks in, all the gears are locked in place and the whole
system spins as one (for a 1:1 ratio), therefore no whine. And in 4th
gear (overdrive) the overdrive gear is now handling the input power.
Did you figure this one out? I have the same noise, changed the transmission and it is still there. Everyone says its normal, but when the same car takes off next to me I haven't heard it.
Nope. I just learned to live with it. Some libertys do it. Some don't. It's the 42RLEs pinion gears. It's never got louder or worse. It's just there. I think you hear it more from the inside because it's quiet on the inside and the transmission sits pretty much right under the center console.
I have a 2010 Liberty and mine does it too. I have a friend with a liberty and she’s does it as well. I had mine since buying it brand new and since day 1 it’s done it. I’m sure it’s normal
@@jordanmahon206 PROBLEM SOLVED ?
torque Converter ? Or maybe berings
? i have the same....
It’s not a problem or issue. It’s just the noise they make
Was it a like wearing tapping noise it almost sounded like a little motor going when the car is moving
Transmission fluid needs changed 100%
Torque Convert