Noticeable Clunk When Putting Jeep into Drive or Reverse and Occasionally While Driving

[DanW]

So again, I think most of what we´re talking about here is normal. That looks like it addresses something more severe.

Appreciate you bringing it to our attention, for sure!

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[Planerdude]

So again, I think most of what we´re talking about here is normal. That looks like it addresses something more severe.

Appreciate you bringing it to our attention, for sure!

No its not normal. My only symptom was the hard clunk going into reverse. Only on a cold engine. This went on from 23,000 miles to 45,000 miles, when it threw the code. The d-clutch controls the 3to4th gear shift as well as the reverse gear. My fluid was totally burnt and the pan full of metal. With millions of these 8 speeds on the road, the failure rate is quite low. 100% if you’re getting the hard clunk in reverse, the d-clutch is failing.
Drain your fluid and have a look

 

[DanW]

No its not normal. My only symptom was the hard clunk going into reverse. Only on a cold engine. This went on from 23,000 miles to 45,000 miles, when it threw the code. The d-clutch controls the 3to4th gear shift as well as the reverse gear. My fluid was totally burnt and the pan full of metal. With millions of these 8 speeds on the road, the failure rate is quite low. 100% if you’re getting the hard clunk in reverse, the d-clutch is failing.
Drain your fluid and have a look

What is a hard clunk is pretty subjective. And with the low failure rate, I seriously doubt everyone reporting it here in this thread is going to experience a failure.

If worried, take it to your Jeep´s service department. Mine isn´t enough to worry me. I´m confident it is normal.

 

[JTGuy]

So I have a hard clunk going into reverse one Time a day when cold. So my trans is slowly failing. I have a 7 year warranty and 75K mile extended warranty that the dealer will probably reject do to tire and gears. If I back into the garage I can avoid the clunk of reverse if that will help at all. The dealer wants a CEL before doing anything.
At this point is there anything I can do to avoid this failure down the road?

 

[Planerdude]

So I have a hard clunk going into reverse one Time a day when cold. So my trans is slowly failing. I have a 7 year warranty and 75K mile extended warranty that the dealer will probably reject do to tire and gears. If I back into the garage I can avoid the clunk of reverse if that will help at all. The dealer wants a CEL before doing anything.
At this point is there anything I can do to avoid this failure down the road?

Mine has 37” tires and the dealer covered mine under the powertrain warranty with no issues. The sooner you fix it the better. The amount metal from the d clutch failing will only cause other components to fail. What is a CEL? The D clutch also does the 3-4th gear shift as well, so backing into the garage is useless.

 

[JTGuy]

The dealer wants to see CEL (check engine light) for codes to report failure somewhere. The 3-4 shift is an important one. I have a Moab trip planned for Easter. That's a week of driving a long way. When it fails what will happen?

 

[Planerdude]

The dealer wants to see CEL (check engine light) for codes to report failure somewhere. The 3-4 shift is an important one. I have a Moab trip planned for Easter. That's a week of driving a long way. When it fails what will happen?

Drive the shit out of it really hard, especially between 3-4th gears. You will get a funky shift or missed shift. When i got mine, the cel came on, but the truck drove normally. In fact by the time I got it to the dealer the cel had gone off. When the dealer scanned it the p0733 code came up as a permanent trouble code. See my post “New tranny at 45,000 miles” post you can see all I went through.

 

[JTGuy]

The failure rate on the 8 speed is very low. I have spoken with shops in Moab that say that they have never seen a failure. Very few here on this forum.

 

[legacy_etu]

No clunk here, forward or reverse, hot or cold

 

[Wheelin98TJ]

The failure rate on the 8 speed is very low. I have spoken with shops in Moab that say that they have never seen a failure. Very few here on this forum.

My 8 speed was replaced at 22k miles. No clunk warning.

The symptoms I had were slipping and flashing "D" on the cluster display.

 

[JTGuy]

I am just going to drive it till it fails or I get lights. Then fix it and sell it. Just not sure what to get next.

 

[DanW]

The failure rate on the 8 speed is very low. I have spoken with shops in Moab that say that they have never seen a failure. Very few here on this forum.

And if one does fail, they can be had for a couple thousand bucks with low miles. Plenty of takeoffs out there, too.

 

[BlackRuby23]

I have had a clunk since new. It is really annoying, and I finally captured a video of the rear drive shaft at the differential as I put the Jeep into drive and then park. Check out how much slop I have:

 

[jav_eee]

I have had a clunk since new. It is really annoying, and I finally captured a video of the rear drive shaft at the differential as I put the Jeep into drive and then park. Check out how much slop I have:

Is this not normal? I’m pretty sure they’re all like this.

 

[JTGuy]

That's normal slop. Almost nothing. Rear end slop is not the clunk. It's in the trans. Perhaps a trans guy can enlighten us on this. Like a dealer trans tech who has rebuilt one, I really don't know.

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