What's a Tranny Mount?
A tranny mount (abbreviation of transmission mount), is a component
(sold here in complete pairs) which isolates the engine &
transmission motion and vibration from the driveline to the
Stock, the Tranny Mount's first and foremost duty is to isolate
vibration from the interior cabin. With a solid mount, like our VAC
Race Aluminum mounts, your interior cabin noise may increase to the
point where it would be intrusive in a street situation.
These are great for a real race car, but not one that drives on
The tranny mount is also used to combat transmission "movement"
during driving (AND THIS IS HUGE for your BMW).
The OEM BMW tranny mounts are one of those known weaknesses across
the brand. They are know to cause everything from miss shifts &
over revs, to physical chassis damage.
Since the transmission is connected to the back of the engine, it
is the engine which is doing the twisting when one accelerates or
decelerates (engine braking).
The engine has it's own mounts (motor mounts) as well.
In a street situation, some movement is expected, however too
much movement (like your aged OE mounts) will cause the
transmission to become misaligned with the chassis of the car, or
simply break apart all together. This is when failures and
miss-shifts can occur, big bad- expensive news.
Hundreds of drivers from daily driven cars to full track cars
have gained the benefit of stiffer bushings with near elimination
At VAC we only carry and sell UUC's "Heavy Duty"/ Firm, bolt
through style mount. Its not for everyone, but read on to
see if it fits your needs as these are our best seller:Red
urethane bolt-through transmission mount bushings are the strongest
choice that still absorbs vibration and a favorite of VAC
customers. Highly recommended for all 6 cylinder models, a bit more
vibration is transmitted on V8 models.
A single bolt through the entire piece eliminates the
possibility of bushing material failure even under abusive
conditions, and that's why this is our mount of choice. Offers
nearly the same drive train motion control as a solid delrin or
aluminum mount, but with satisfactory vibration isolation to reduce
vibratory stress on mechanical components and keep cabin occupants
comfortable. Cabin vibrations are significantly lower than
delrin/aluminum solid mounts, but is still noticeable vs OE rubber.
(Plus: Transmission mount enforcer cups not required with these
UUC's Polyurethane Mounts Fit:
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