Is it ok to lift rear of Mustang using a jack below the rear differential ?

[K4fxd]

X's are jack points O's are stand points.

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[EFI]

So this is the stronger one? I was looking for the cover to be rusted

Only the pumpkin comes in different alloys (aluminum or iron). The cover is aluminum for all of them which is why you don't see rust. Yes you have the stronger one, but only in the mounting sense eg. the ears that mount it to the chassis is where it usually fails. The differential itself inside is not any stronger than others.

 

[GTP]

I think some of the concern with jacking up an IRS rear (like the S550) from just the pumpkin is that the weight of the vehicle is now on the rear diff flanges and associated mounting bolts.

Exactly. Lifting the car puts the diff bushings in shear from a few hundred pounds of the rear suspension/wheels/cradle/etc. And it's not good to use a jack as a stand, unless it for just a moment and never when you're under the car.

Lifting the car with the diff puts those bushings in shear with a couple thousand pounds from the weight of the car.

On rare occasions I will lift the rear of my car from the center using a jack under the diff. But either I keep the session super short (a minute or two), or I put some jacks stands back there and let off on the jack.

 

[stannypack]

I feel like it's easier to just buy a 2nd jack and have my friend double jack the car simultaneously and set it on stands lol. and couldn't you also use the 2nd jack as a jackstand?

 

[Sig556]

This is another thread that gets beat to death. The best course of action on (IRS) is to never jack up the rear end by the pumpkin alone. If you are going to do a lot of your own service and keep the car for a while. Invest in jacking rails and a good set of jack stands. BMR are the best and strongest out there. (Jacking Rails)

 

[luca1290]

Why don't bite the bullet and bring home a QuickJack? That's the safest and quickest way to lift the car, the only drawback it's the cost.

 

[Oakley]

Why don't bite the bullet and bring home a QuickJack? That's the safest and quickest way to lift the car, the only drawback it's the cost.

yeah i mean why don't you guys just get two post lifts?

 

[stannypack]

brb, installing a lift in my apartment parking lot
on a serious note, I can just jack on the yellow and jackstand the red jack pads right

 

[MAGS1]

brb, installing a lift in my apartment parking lot
on a serious note, I can just jack on the yellow and jackstand the red jack pads right

Yes

 

[Cyberbill]

Like everyone has said…don’t ever get under your car with just the hydraulic Jack holding it up ! If the seals in the Jack fail, you will be headed off to the hospital with an imprint of a muffler on your face…. The ER doctors won’t know what to do!! LOL
Grandpa Bill

 

[StangTime]

Get one of these jack cross beam adapters and you can jack the IRS frame without fear of tearing diff bushing or breaking diff ears. I throw a couple solid hockey pucks on top of the plates to clear the exhaust. Make sure you chock the front wheels.

 

[BluePonyGT]

Seriously, install the full length jacking rails on your car. Spend some quality time with your jack and jack stands to get the car in the air, then adjust the height on each side until the car is level. If you have a QuickJack system, then that's great so long as your working surface is already level.

I have a similar jacking system as what is pictured installed on that jack above, and that I can use to lift the rear subframe if I have to disconnect anything, but that is used once the car is already in the air. It's not meant to lift the car BY that system alone. It's meant to lift sub-components UP to where the car IS. It's essentially a glorified transmission jack.

Nothing beats a quality 2-post lift, but without that having sturdy jack stands that make the car level and safe to work under is the next best thing IMO.

 

[StangTime]

I have a similar jacking system as what is pictured installed on that jack above, and that I can use to lift the rear subframe if I have to disconnect anything, but that is used once the car is already in the air. It's not meant to lift the car BY that system alone. It's meant to lift sub-components UP to where the car IS. It's essentially a glorified transmission jack.

That jack adapter can lift the whole rear. It is rated for 4000lbs (3000lbs fully extended). I use it if I just want the back of the car in the air. Pump the jack and add jackstands in front of the rear wheels on the jacking rails. Remove the jack.

 

[HoosierDaddy]

Exactly. Lifting the car puts the diff bushings in shear from a few hundred pounds of the rear suspension/wheels/cradle/etc. And it's not good to use a jack as a stand, unless it for just a moment and never when you're under the car.

Lifting the car with the diff puts those bushings in shear with a couple thousand pounds from the weight of the car.

On rare occasions I will lift the rear of my car from the center using a jack under the diff. But either I keep the session super short (a minute or two), or I put some jacks stands back there and let off on the jack.

Yeah. Which is why I'm surprised Ford says its a jack point.

 

[StangTime]

Yeah. Which is why I'm surprised Ford says its a jack point.

Do they though? There is nothing in the manual about alternate jacking locations.
The service manual shows these as the only jack locations.

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