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Pontiac Fanboy
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1,023 Posts
May be another, "what's the cost and then why not insert or harrop?" situation.
 

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76 Posts
It looks rigid. I installed a spacer from rev shift in the OE mount. Too much vibration because the insert is hard poly. So, I went old school and linked together some long hose clamps. The trick is to crisscross the clamps over the tranny and under the x-member. It prevents the tranny from rocking and still dampens vibration.

I am not trying to prevent you from buying the unit. If it stiffens the drivetrain without vibes, I'd buy one too. But if if is hard poly and not rubber, or extremely hard rubber, than it will vibrate.
 

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Excuse me? Is this a tranny or diff mount. It looks like a tranny mount. If for the diff, then I stand corrected. But, the trick does work for tranny mounts.
 

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120 Posts
Discussion Starter #5
Excuse me? Is this a tranny or diff mount. It looks like a tranny mount. If for the diff, then I stand corrected. But, the trick does work for tranny mounts.
It's a diff mount. One place that lists it mentions that is comes with both rubber and delrin bushings but I have not found that anywhere else. I plan to do something back there eventually and just stumbled across this, never seeing anything about it before, and thought I would see if anyone had experience with it.
 

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Yes, delrin is a type of polymer and commonly used in suspension bushings. Try the rubber bushings. But beware, rubber can achieve durometric hardness similar to poly.
 

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Rockin the Bakken
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319 Posts
I bought one! Haven't had a chance to pick it up though. When I get it installed I'll let you all know what it's like.
 

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Premium Member
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I bought one! Haven't had a chance to pick it up though. When I get it installed I'll let you all know what it's like.
I look forward to hearing your review, ive been thinking about this unit as well, sicne it comes with a rubber bushing option
 

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171 Posts
I installed one just like it but doesn't have the GTO engraved in it. Seems to work fine. Not sure it has any advantages over the insert though. I still have very slight wheel hop. I had the diff insert installed before.
 

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Rockin the Bakken
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319 Posts
I look forward to hearing your review, ive been thinking about this unit as well, sicne it comes with a rubber bushing option
That will take a while. I'm recovering from partial knee replacement. I have picked it up and it comes with 2 sets of bushings, rubber and plastic.
 

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Rockin the Bakken
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319 Posts
I am finally getting around to putting another differential in with the Speedmaster mount. So far Ive found that the bolts that attach to the diff housing are to long! I contacted the people I purchased from and they don't give a rats a$$. I asked them if they kept their job at Ikea just increase this machining thing doesn't work but I haven't got a reply. I'm going to install with this mount no matter what because the mount that came out of the car is in 2 pieces. the area where the rubber mount attaches to the steel had let go. Maybe this was the cause of the violent wheel hop!!
 

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Rockin the Bakken
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319 Posts
I now have the differential in and all I need to do is get the driver side exhaust in and take it for a ride. Weather permitting of course. I had too get 2 thick spacers to get the thing mounted but it fit nice. The piece that mounts to the differential was completely separate from the piece that mounts to the frame on the OEM mount.
 

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Rockin the Bakken
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319 Posts
The differential is in. There is some vibration and I suspect its from bad drive line angles. The rear mount allows for up and down adjustment but I'll have to take the plastic cover off behind the mount to be able to check and adjust angles. This will likely happen in April!!
 
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