rear differential grinding noise.

[f1502022]

Hi all, i need some insight here. I Jacked the rear of the truck up and spin the right rear tire in the forward motion and i could hear this loud grind/gear noise. it sounds like theres no dif fluid in there...i could be wrong...its a 2022 lariat, is this the anti-slip occurring because nothing is touching? if it is that well...it still sounds pretty bad id say? any answers would be greatly appreciated. i attached a video/shorts on youtube so you can watch the video. Thanks!

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[WhiteLightningnshitshadow]

Cant seem to see the video. If its max tow axle, I wonder if the sheared bolt issue hit it and one if the axles shifted.

 

[f1502022]

See if this video works. Yeah I don’t believe I have max tow. My rear looks like this.

 

[Gros Ventre]

Don't know if it applies to all axle variants, but my PB says do not jack up using the pumpkin.

 

[My 2ND Ford]

Don't know if it applies to all axle variants, but my PB says do not jack up using the pumpkin.

I believe it refers to all axles. Not sure why, because I have jacked up trucks for years using the pumpkin with no ill effects.

 

[My 2ND Ford]

See if this video works. Yeah I don’t believe I have max tow. My rear looks like this.

So who threw the bag of marbles into your diff? ?

 

[f1502022]

Cant seem to see the video. If its max tow axle, I wonder if the sheared bolt issue hit it and one if the axles shifted.

Check it now. Sent it differently.

So who threw the bag of marbles into your diff? ?

lol…. What’s confusing is when the truck is sitting I got my wife to slowly coast it forward and I couldn’t really hear much… even in reverse. You’d think I’d hear it wouldn’t you??? But if I jack it up you can definitely hear grinding gears or whatever it is.

 

[Gros Ventre]

I believe it refers to all axles. Not sure why, because I have jacked up trucks for years using the pumpkin with no ill effects.

It depends on the axle. My 92 Suburban K-1500 specifically said the was acceptable to lift the truck. But when I first needed to lift the F-150 I read the manual and it says that's a no-no. In the end I suppose that depends on how good the welds for the axle tubes in the pumpkin are made.

 

[Buyer2021]

Based on this pic you do NOT have the Max Tow package - you have the common semi-floating standard axle, not the 3/4-float axle with potentially problematic end-bolt

 

[My 2ND Ford]

It depends on the axle. My 92 Suburban K-1500 specifically said the was acceptable to lift the truck. But when I first needed to lift the F-150 I read the manual and it says that's a no-no. In the end I suppose that depends on how good the welds for the axle tubes in the pumpkin are made.

I think it's because everything on our vehicles is being made lighter, so it stands to reason that the axle assembly is not as beefy as they used to be. Admittedly , I haven't owned a truck since 2003, but my 83 C-1500, my 88 F-250, and my 97 Ram 1500 all got lifted by the rear pumpkin. So I wonder how long Ford has been advising people to not lift their truck using the rear pumpkin . Curious to find out.

 

[Revz]

I) I’ve long heard the advice not to lift by the pumpkin - apparently b/c some don’t line the jack up correctly and the cover plate can be nudged/unseated and cause a leak. Never actually seen it happen.

ii) The rear diff in my 21 XLT shred itself apart in the first 3 months / 1,800 miles. Dealer said the pinion nut was loose, so started slowly (at first) grinding down until it started sounding like the OP’s. Grinding sound was also intermittent (only at certain speeds, jacked up, etc.)

 

[WhiteLightningnshitshadow]

Yeah they advise against pumpkin jacking 2011+ mustangs too at least. I think these units are stronger than ever, but doesn't account for dogshit uaw assembly. My rear diff fluid was low almost a 3/4 quarts.

 

[Old Bear]

I think it's just a matter a logic about lifting loads. You always want to lift in as straight of a vertical line as reasonable for the load. That suggests under spring mounts when possible. The pumpkin was never intended to support the weight of the vehicle, although often times in can. But why take the risk?

 

[f1502022]

It depends on the axle. My 92 Suburban K-1500 specifically said the was acceptable to lift the truck. But when I first needed to lift the F-150 I read the manual and it says that's a no-no. In the end I suppose that depends on how good the welds for the axle tubes in the pumpkin are made.

Yeah idk I’ve just always jacked from the pumpkin. I obviously do it slow and not ramp on it like I’m pumping a tire… my truck is lifted 6” so it’s just the lowest point for me to jack it up. But besides that I’m going to book an appointment but I know they are just going to test drive it and it will probably make no sound. I guess I’ll have them watch my video? Or tell them if it’s up in the air and spin the tires you’ll hear a grind sound. Oh

I) I’ve long heard the advice not to lift by the pumpkin - apparently b/c some don’t line the jack up correctly and the cover plate can be nudged/unseated and cause a leak. Never actually seen it happen.

ii) The rear diff in my 21 XLT shred itself apart in the first 3 months / 1,800 miles. Dealer said the pinion nut was loose, so started slowly (at first) grinding down until it started sounding like the OP’s. Grinding sound was also intermittent (only at certain speeds, jacked up, etc.)

did your kinda sound like mine? And I make sure when I’m jacking it up to place it on the smooth groove sides. I understand what you mean tho. I almost wana try and out jack stands on each side of the shaft and lower it and test it out . I’ll probably hear the same sound… but yesterday I got my wife to do circles around my truck and couldn’t

I) I’ve long heard the advice not to lift by the pumpkin - apparently b/c some don’t line the jack up correctly and the cover plate can be nudged/unseated and cause a leak. Never actually seen it happen.

ii) The rear diff in my 21 XLT shred itself apart in the first 3 months / 1,800 miles. Dealer said the pinion nut was loose, so started slowly (at first) grinding down until it started sounding like the OP’s. Grinding sound was also intermittent (only at certain speeds, jacked up, etc.)

this might sent twice. Bad service at work. But yes I try my best to jack it up carefully. I might try and set jack stands on each side of the shaft and test it out that way but probably will sound the same… strange though got my wife to drive in a circle and I couldn’t really tell if I was hearing anything… but I also have a really really loud exhaust too lol.

I think it's just a matter a logic about lifting loads. You always want to lift in as straight of a vertical line as reasonable for the load. That suggests under spring mounts when possible. The pumpkin was never intended to support the weight of the vehicle, although often times in can. But why take the risk?

 

[Gros Ventre]

In my experience the owners manual will show you the acceptable lifitng points. As I mentioned my 92 GMC Suburban specifically called out lifting by the pumpkin. So when I went to look at my 21 F150 the owners manual said no. My inference from this is that as manufacturers were in search of ever greater fuel mileage, they kept removing weight wherever they could. The result being that they shaved down the metal in the pumpkin along with other places...

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