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Home > Rubber vs Polyurethane Bushings
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Ultra-Flex Rubber vs. Classic Polyurethane
Which is Better?
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Some swear by rubber bushings in their motor mounts. Others prefer the feel of polyurethane. We say, "It's a personal decision."
A few considerations.....
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Daily driver vs. off-road king?
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Sporty feel vs. cushion comfort?
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Engine finely tuned vs. tuned in a fog?
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Driveline pristene vs. survived a few drops?
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Changing transmission mount with the motor mounts?
Bushing Comparisons.
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Characteristic
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Ultra-Flex
Rubber
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Classic
Polyurethane
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Vibration Dampening
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Excellent
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Fair
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Oxidation Resistance
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Good
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Excellent
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Petrochemical Resistance*
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Fair
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Excellent
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Temperature Rating**
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-60 to 185 (F)
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-30 to 185 (F)
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Heat Aging Resistance
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Fair
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Very Good
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Tensile Strength
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Excellent
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Excellent
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Weather Resistance
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Fair
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Excellent
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* Based on amount of bushing exposed in motor mount when installed on vehicle.
** Nominal performance retained within this range. Does not indicate failure outside this range.
What's the dog say? Around here, the Brown Dog's word is law. And since we're in the heat of the desert southwest, we run on Classic Polyurethane motor mounts. (We also use our 2.5L Wrangler YJ as our daily-driver.) The Brown Dog wants to feel what's going on under the hood, etc.
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