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 Post subject: front trans mount
PostPosted: Sun Jul 13, 2008 10:47 pm 
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Retired Site Developer
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Joined: Wed May 21, 2008 11:07 pm
Posts: 3046
Location: Minnesota
Year and Trim: 2002 SLE
is there a way to tell if it is bad? i can post a video tomorrow if you guys want. I felt the symptoms that can mean a bad mount (clunking, and when i shifted into drive facing up a hill, the trans didn't seem to engage for a second. i just rolled backwards.
how noticeable is the vibration from the hockey puck method? this is a DD, and while i would like better performance, im not looking for performance at the cost of comfort.
and is there a write-up on how to do that? the old thread on BC is deleted, and i couldn't find it here .


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 Post subject: Re: front trans mount
PostPosted: Mon Jul 14, 2008 12:05 am 
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Certified Bonneville Nut
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Joined: Sat May 24, 2008 5:18 pm
Posts: 4938
Location: Sycamore, IL
Year and Trim: 05 Chevy 'Hoe
1997 'maro (3.8L M5)
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Your engine will have signif roll back on throttle if the front one is gone. A solid mount is just that, SOLID. I think you get more of a feel of what the car is doing with a solid mount. It def plants them quicker than an OEM hydraulic. I attribute it to riding in a 3rd Gen F-body, good performance feel but maybe not for your grandma....

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 Post subject: Re: front trans mount
PostPosted: Mon Jul 14, 2008 12:14 am 
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Location: Browerville, MN
Year and Trim: 2004 GXP - plus a handful of other Bonnevilles
The difference in vibration is minimal at most, and IMO, its a good thing.

Pop your hood
Apply your parking brake
While holding the brake pedal, put the shifter in D and give it some gas, then put it in R and give it some gas

If the engine is moving more than ~2" the mount is shot.

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 Post subject: Re: front trans mount
PostPosted: Mon Jul 14, 2008 12:17 am 
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Joined: Wed May 21, 2008 11:07 pm
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Location: Minnesota
Year and Trim: 2002 SLE
i checked it earlier today and i think it was more than 2". i will post a video tomorrow. do you have a write-up on it?


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 Post subject: Re: front trans mount
PostPosted: Mon Jul 14, 2008 12:21 am 
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Joined: Mon May 19, 2008 6:04 pm
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Location: Browerville, MN
Year and Trim: 2004 GXP - plus a handful of other Bonnevilles
I can't get into BC/BF, but do a search for "solid motor mount" by "willwren", I did a writeup in there.

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2004 Bonneville GXP | White Gold Tricoat | custom built supercharged 3800 hot rod
2005 Town & Country Limited | Butane Blue Metallic | 270k | Family Hauler
2002 Ram 1500 Quad Cab Sport | Black| 190k | Official Bonneville Hauler


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 Post subject: Re: front trans mount
PostPosted: Mon Jul 14, 2008 11:24 am 
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Posts like an L36
Posts like an L36

Joined: Thu May 22, 2008 10:29 am
Posts: 977
Location: Sacramento,CA
Year and Trim: 2000 SSEi
You can make one (solid mount) its so simple, I made the first solid mount for the 2000+ Bonneville.
I like mine (140,000+ miles on it). Lift the hood, rock the car(back and forth) in park, see all that movement,
that is not good for all the fule lines, electrical lines, exhaust pipe so on and so on.
It will also help with the torque steer. It will help put the power to the ground.
I made a 3" wide motor mount for my car, but i made a 2 1/2" wide motor mount for a friend and it works just as GOOD.
We used a 2 1/2" hole saw and cut holes (wafers) out of the sidewall of an old truck tire. Cost for his solid mount $0.00 and he has over 40,000 miles on his with out any problems.
If I had to make a new one for my car I would use the wafers made out of the sidewall of an old truck tire.
The distance between the top of the BOTTOM cross member and the bottom of the TOP motor mount bracket is 3 5/8".
Go and make one up for your car, if you don't like it (you spent all of $5 for the solid mount) you can always go and buy the OEM pos mount.

ROD

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PB 14.474 @ 96.248 PB 60' 2.168
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 Post subject: Re: front trans mount
PostPosted: Thu Sep 25, 2008 5:17 pm 
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SLE Member
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Joined: Wed Jul 23, 2008 9:19 am
Posts: 51
Year and Trim: 2002 Pontiac Bonneville SSEI
On another forum there was an extensive discussion on the front motor mount. Grumbling about it not lasting and being too expensive. Proposed solution was to fabricate a solid motor mount. Similar to the post above. Basic process was to drill a hole in frame to allow passage of a large bolt (7") from the bottom upwards. Spacers were made from either hockey pucks drilled through the center or boat trailer neoprene rollers (West Marine, etc.) Complaint was vibration/buzzing noise and solution was to isolate the head of the bolt from the frame with a strut end bushing sandwiched between two heavy washers.


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 Post subject: Re: front trans mount
PostPosted: Thu Sep 25, 2008 10:46 pm 
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Joined: Sat May 24, 2008 11:45 pm
Posts: 138
Year and Trim: 2005 Pontiac Bonneville SLE
Last week my car was leaking fluid by the radiator and it was red. so I got underneath thinking it was a transmission line. I couldnt find where the leak was coming from since it was by the frame. I took it to the dealer and found out it was the front motor mount, its the one on the left side behind the radiator. it has one bolt on top and one on the bottom. They told me that the motor mounts are oil filled, which its hydraulic fluid. I had never heard of that, so Im thinking if your mount is bad it would be leaking fluid. They charged $118. for the mount and $170.00 labor. thanks to having an extended warranty my part was 50.00.


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 Post subject: Re: front trans mount
PostPosted: Thu Sep 25, 2008 10:47 pm 
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Joined: Sat May 24, 2008 11:45 pm
Posts: 138
Year and Trim: 2005 Pontiac Bonneville SLE
Last week my car was leaking fluid by the radiator and it was red. so I got underneath thinking it was a transmission line. I couldnt find where the leak was coming from since it was by the frame. I took it to the dealer and found out it was the front motor mount, its the one on the left side behind the radiator. it has one bolt on top and one on the bottom. They told me that the motor mounts are oil filled, which its hydraulic fluid. I had never heard of that, so Im thinking if your mount is bad it would be leaking fluid. They charged $118. for the mount and $170.00 labor. thanks to having an extended warranty my part was 50.00. :banana:


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 Post subject: Re: front trans mount
PostPosted: Fri Sep 26, 2008 2:37 am 
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Joined: Thu May 22, 2008 3:52 am
Posts: 118
Location: Brighton, MI
Year and Trim: 2002 SE
My OEM mount was almost ripped in half, but no signs of fluid.


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 Post subject: Re: front trans mount
PostPosted: Fri Sep 26, 2008 9:27 am 
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Posts: 8707
Location: Grand Rapids, Michigan
Year and Trim: 2014 Cadillac XTS Vsport.
By the time most people notice the problem, the oil is long gone.

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