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Rotated mount installation M35 LSJ/LNF

Old 10-17-2013, 09:39 PM
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^^^Thanks John!
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Old 05-14-2014, 11:12 AM
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Since im getting my gmpp clutch and cabs installed soon, do you think the mounts are a job my mechanic could do without seeing this how to? Im not too confident with this install knowing that the engine and trans could shift. And mine are for a lnf so to loosen the top bolts I would have to remove my intake, correct?
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Old 05-17-2014, 01:23 PM
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^anyone
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Old 05-17-2014, 01:34 PM
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Yes, easily.
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Old 05-17-2014, 01:37 PM
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Originally Posted by chris88z24 View Post
Yes, easily.
My mechanic wouldnt have a problem is what you're saying, correct?

Is this the same way u would install stock tranny mounts?
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Old 06-24-2014, 07:23 AM
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I installed the rotated mounts and honestly believe they are backyard engineered. The front mount was dimensionally the same as the stock - hole to hole. The rear mount was approx. a 3/8in taller. I had to loosen the upper mounts and jack up the motor and still the rear mount was forced together. The upper mounts support the weight of the motor. The lower mounts prevent rotation. Simply increasing the height of the rear mount causes much weight of the motor to be transferred to that rear mount. How many of you have had these mounts installed for more than a year. I suspect the rear mount bushing or the mount itself will fail due to overload.

I ended up removing my rotated rear mount and installed GM part 20814995. This mount is superior to the original and there is no need to force things together. I kept the aftermarket front mount. This configuration is obviously not rotated but certainly stiffened the entire drivetrain. I experienced minimal vibration with the rotated mounts and none with the GM rear mount.

The whole idea of loosening the upper mounts to let the bolts fall to one side of the oversized holes is clearly ill conceived. You can swing the motor front to back by redesigning the lower mounts but lifting the motor with the rear mount is just wrong. Clearly the mounts being sold are the cause of your vibrations.

Sorry but I cannot recommend the rotated mounts.
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Old 06-24-2014, 03:25 PM
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It's hard to know where to start replying to your post. As we say the rear mount is raised and the front is lowered and as a result the middle torque axis mounts must allow the motor to move forward ( that is very logical up 10 mm rear dorm 10 mm front) you then day "ill conceived"
So how do you figure that? We are not moving the engine a whole lot. We first made these mounts with stock housings. Then expensive alloy. Now less expensive steel TIG welded in
A jig fixture and powdercoated. Over the years since 2004 we have made hundreds of mounts. Occasionally someone comes along like you. Calls it not good then sticks the rear spacer in a stock mount setup. That's just sad. My take. Yes I developed these mounts in 2004 and the logic the work and the validation was done inside a GM performance division race program
That they hired me and paid me to produce. By all
Accounts it was successful

And here I am driving a delta with rotated mounts and living the good life everyday without wheel
Hop. SMH
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Old 06-24-2014, 03:39 PM
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Originally Posted by mjtct View Post
I installed the rotated mounts and honestly believe they are backyard engineered. The front mount was dimensionally the same as the stock - hole to hole. The rear mount was approx. a 3/8in taller. I had to loosen the upper mounts and jack up the motor and still the rear mount was forced together. The upper mounts support the weight of the motor. The lower mounts prevent rotation. Simply increasing the height of the rear mount causes much weight of the motor to be transferred to that rear mount. How many of you have had these mounts installed for more than a year. I suspect the rear mount bushing or the mount itself will fail due to overload.

I ended up removing my rotated rear mount and installed GM part 20814995. This mount is superior to the original and there is no need to force things together. I kept the aftermarket front mount. This configuration is obviously not rotated but certainly stiffened the entire drivetrain. I experienced minimal vibration with the rotated mounts and none with the GM rear mount.

The whole idea of loosening the upper mounts to let the bolts fall to one side of the oversized holes is clearly ill conceived. You can swing the motor front to back by redesigning the lower mounts but lifting the motor with the rear mount is just wrong. Clearly the mounts being sold are the cause of your vibrations.

Sorry but I cannot recommend the rotated mounts.
Just re reading your post here. When did you get these mounts? Recently?

And who's mounts are they?
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Old 06-25-2014, 07:20 AM
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I've been running Powells S1 mount with rear SS/TC mount since 2010.

No vibrations & wheel hop next to none. They work.
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Old 06-25-2014, 08:03 PM
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Same here. That guy needs to go do some more measuring. First of all, the bolt hole dimensions are always going to be the same, otherwise the mount won't bolt to the trans/frame. Secondly, the upper mounts do prevent rotation, which is why the ingalls torque dampener was so effective when these cars first came out.
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Old 06-26-2014, 10:09 AM
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I've reccomended these to anyone who asks.

Although mine were not purchased from Powell, they are still his design, and a fantastic part.
I noticed a difference almost immediately - although it's hard to remember what the difference was because I have been runnign them for so long.

IMO, mjtct is either an outright tool, or looking to discredit a fantasitc part for some sort of round about gain.
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Old 06-26-2014, 10:54 AM
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Originally Posted by soundjunky View Post
I've reccomended these to anyone who asks.

Although mine were not purchased from Powell, they are still his design, and a fantastic part.
I noticed a difference almost immediately - although it's hard to remember what the difference was because I have been runnign them for so long.

IMO, mjtct is either an outright tool, or looking to discredit a fantasitc part for some sort of round about gain.
I went from SS/TC mounts w/ Ingalls TD to Powell's S1 mount w/ rear SS/TC mount, and never looked back.
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Old 06-26-2014, 11:13 AM
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Originally Posted by mjtct View Post
I installed the rotated mounts and honestly believe they are backyard engineered. The front mount was dimensionally the same as the stock - hole to hole. The rear mount was approx. a 3/8in taller. I had to loosen the upper mounts and jack up the motor and still the rear mount was forced together. The upper mounts support the weight of the motor. The lower mounts prevent rotation. Simply increasing the height of the rear mount causes much weight of the motor to be transferred to that rear mount. How many of you have had these mounts installed for more than a year. I suspect the rear mount bushing or the mount itself will fail due to overload.

I ended up removing my rotated rear mount and installed GM part 20814995. This mount is superior to the original and there is no need to force things together. I kept the aftermarket front mount. This configuration is obviously not rotated but certainly stiffened the entire drivetrain. I experienced minimal vibration with the rotated mounts and none with the GM rear mount.

The whole idea of loosening the upper mounts to let the bolts fall to one side of the oversized holes is clearly ill conceived. You can swing the motor front to back by redesigning the lower mounts but lifting the motor with the rear mount is just wrong. Clearly the mounts being sold are the cause of your vibrations.

Sorry but I cannot recommend the rotated mounts.
Who's mounts are you talking about?

I've been on Powell's mounts for over a year and no vibe, no wheel hop, but I also installed them correctly following Powell's install guide.
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Old 06-27-2014, 12:27 AM
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My Powell front mount and rear LNF mount has been awesome. Yeah slight vibrations but only at idle and with load (say AC on). Don't know what that guy is even talking about.
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Old 06-27-2014, 07:22 AM
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Originally Posted by andrewcarr1993 View Post
My Powell front mount and rear LNF mount has been awesome. Yeah slight vibrations but only at idle and with load (say AC on). Don't know what that guy is even talking about.
He either....

A. Didnt install them correctly
B. Doesnt understand how they actually work
C. All of the above

I vote C.
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Old 06-27-2014, 08:18 AM
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D. Doesn't actually have rotated Powell mounts.
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Old 02-10-2016, 10:31 PM
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Bump and subd
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Old 02-12-2016, 05:30 PM
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the naysayer disappeared into the ether
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