Low speed 'Tocking' when stopping or starting

[joelster]

Did they replace your half shafts or was the repair something else? All 4 front and rear?

Sorry. Maybe my post was unclear.

They did not replace any parts. They lubed the splines on the noisy half shaft (LF) and re-torqued the half shaft bolts. The reason it had to go to Bellingham was that apparently they don't have a lift at the current PDX SC. They needed to get the truck up on a lift to fully extend the half shaft and access the splines.

What is interesting to me is that they only lubed the effected driveline. Wouldn't you want to hit them all while you were at it? Their response to that was that the others were not on the ticket.

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[Tonicart]

Sorry. Maybe my post was unclear.

They did not replace any parts. They lubed the splines on the noisy half shaft (LF) and re-torqued the half shaft bolts. The reason it had to go to Bellingham was that apparently they don't have a lift at the current PDX SC. They needed to get the truck up on a lift to fully extend the half shaft and access the splines.

What is interesting to me is that they only lubed the effected driveline. Wouldn't you want to hit them all while you were at it? Their response to that was that the others were not on the ticket.

I can live with the noise -- just concerned if it's a long term durability thing and if they would deny a future warranty because I delayed service. I'd rather take it in when they have a real solution.

 

[RexRemus]

I can live with the noise -- just concerned if it's a long term durability thing and if they would deny a future warranty because I delayed service. I'd rather take it in when they have a real solution.

So drive the fuck out of it and wear it out as fast as possible while it's under warranty and get your replacement with the "working" solution 2 years from now ?

 

[TheIglu]

After replacing my front drive shafts AND my entire front drive unit a month ago, the "tock" is back.

 

[DaveA]

After replacing my front drive shafts AND my entire front drive unit a month ago, the "tock" is back.

Within spec...

 

[electruck4x4]

Generally cars/trucks don't age/wear into developing "good" sounds. There are very few times where a mechanic is going to tell you, "oh yeah, you broke it in. Now it makes a clunk".

A minor tock is probably nothing urgent, but worth getting checked out at some point in the future (e.g. your next appointment). If it gets worse, then yeah, something is loosening up or wearing and you should probably get it addressed sooner than later.

 

[M4H4X]

JFYI folks, I’ve seen this exact same discussion over on the TeslaMotorsClub forums in regards to the model S, the model Y, and especially the model X.

Consensus over there was two fold:

1) It is a manufacturing tolerance problem between the splines and the hub/motor input. (Same as here.)

2) It is potentially exacerbated by the high torque combined with CV angle (joint slack) over time because the plaid generates over 1000tq (similar boat here.)

My plaid had this issue but my Y didn’t. My R1T (250miles on it.) has also already started “tocking”. It seems minor though.

Anyways, the procedure to fix the problem is the EXACT SAME over in Tesla land.

1) Grease the hub/splines and retorque. Comes back after a few hundred to a thousand miles or so.

2) Once extreme enough Tesla replaces the shafts. (Still noise eventually returns.)

And the cherry on top is I see the same talk about some hypothetical “redesigned shafts” that never materialize. (I’ve been off that train for a few months … so Tesla might have something by now, might not?)

I’m sure that @jebinc has dealt with this.

 

[M4H4X]

Also to go a little into the outfield here:

To add to my previous post I don’t know if a true fix will ever materialize. I feel at this point that the CV shaft design is just incompatible with instant EV torque. The stresses these shafts are under in our EVs are equivalent to high powered track cars of yesterday. And those wore out quickly too.

The true long term fix may eventually come from miniaturization. The Lucid motors are almost small enough to be part of a hub assembly. Maybe some day the motors will be right on the hub. No joints at all.

 

[mini2nut]

25k miles on our Model Y. Zero driveline lash or strange noises. The driveline is as smooth as a sewing machine.

 

[M4H4X]

25k miles on our Model Y. Zero driveline lash or strange noises. The driveline is as smooth as a sewing machine.

On the Teslas it manifests as sort of a metallic “tick” instead of the “tock” we hear. ?

Here is an example on a model 3 along with a fix that sounds very familiar:

 

[M4H4X]

Does anyone know if the axle bolts are one-time-use? (Like a fly wheel bolt on a car. Torque once then discard.)

 

[jebinc]

JFYI folks, I’ve seen this exact same discussion over on the TeslaMotorsClub forums in regards to the model S, the model Y, and especially the model X.

Consensus over there was two fold:

1) It is a manufacturing tolerance problem between the splines and the hub/motor input. (Same as here.)

2) It is potentially exacerbated by the high torque combined with CV angle (joint slack) over time because the plaid generates over 1000tq (similar boat here.)

My plaid had this issue but my Y didn’t. My R1T (250miles on it.) has also already started “tocking”. It seems minor though.

Anyways, the procedure to fix the problem is the EXACT SAME over in Tesla land.

1) Grease the hub/splines and retorque. Comes back after a few hundred to a thousand miles or so.

2) Once extreme enough Tesla replaces the shafts. (Still noise eventually returns.)

And the cherry on top is I see the same talk about some hypothetical “redesigned shafts” that never materialize. (I’ve been off that train for a few months … so Tesla might have something by now, might not?)

I’m sure that @jebinc has dealt with this.

Hello brother (from another mother)! Yeah, I pick my optioned up R1T Adventure on Monday. Recall work already performed. At least here, the Rivian doesn’t vibrate like my MoFo Plaid! Selling the MYP, only because I need an empty bay in the theee bay garage for the R1T.

I’ve read that the recall retorquing has eliminated the “tocking” and pulling to the right for some members. I will be driving mine six hours home so I’ll get a good feel for it as it compares to the Tesla.

When did you get yours? SPECS, S/N, color? Mine is S/N 99xx - so it was pre Sandy Munro suggested cheapening actions (12v in frunk, magnetic trim clips, etc), but far enough along in the production cycle to avoid some of the early run issues. 238 miles on her, and the spec owner I know pretty well - who is as OCD as me. Supposedly this one is perfect, and even the Tonneau works (for now)! ?

 

[M4H4X]

Hello brother (from another mother)! Yeah, I pick my optioned up R1T Adventure on Monday. Recall work already performed. At least her, the Rivian doesn’t vibrate like a MoFo Plaid! Selling the MYP, only because I need an empty bay in the theee bay garage for the R1T.

I’ve read that the recall retorquing has eliminated the “tocking” and pulling to the right for some members. I will be driving mine six hours home so I’ll get a good feel for it as it compares to the Tesla.

When did you get yours? SPECS, S/N, color? Mine is S/N 99xx - so it was pre Samdy Munro suggested cheapening actions (12v in frunk, magnetic trim clips, etc), but far enough along in the production to avoid some of the run issues. 238 miles on her and the owner I know pretty well who is as OCD as me. Supposedly this one is perfect, and even the Tonneau works (for now)!

Mines in the 45XX range. It’s a launch edition (large pack?) quad motor. I have all the pre-cheapening options as well. I think mine is unaffected by the recall but I’ll probably schedule the mobile service just to be safe once I get access to the app.

I forgot about the vibrating shafts in the plaid! That was another frustration.

Honestly I think motor-on-hub will be the long term design solution here. No joints, no shafts. Less power loss, higher efficiency. Would allow for all types of suspension geometry (high angle lifts, etc…) without added stress on the rotating mass…

I am not an engineer though (of hardware at least…) so ?‍

 

[jebinc]

Mines in the 45XX range. It’s a launch edition (large pack?) quad motor. I have all the pre-cheapening options as well. I think mine is unaffected by the recall but I’ll probably schedule the mobile service just to be safe once I get access to the app.

I forgot about the vibrating shafts in the plaid! That was another frustration.

Honestly I think motor-on-hub will be the long term design solution here. No joints, no shafts. Less power loss, higher efficiency. Would allow for all types of suspension geometry (high angle lifts, etc…) without added stress on the rotating mass…

Nice! Colors? Mine is LA Silver/black Mountain. Quad and large pack. Got the underbody armor, roof racks, power tonneau cover, beefy 20” all terrain tires, etc.

 

[M4H4X]

Nice! Colors? Mine is LA Silver/black Mountain. Quad and large pack. Got the underbody armor, roof racks, power tonneau cover, beefy 20” all terrain tires, etc.

https://www.rivianforums.com/forum/posts/220063/

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