Replace Subframe

I want to replace my '99 WR400 steel subframe with a YZ subframe.

Are the '99 and newer YZ400/426/450 subframes aluminum?

Which years subframe from YZ's will fit the '99WR?

YZ subframes will fit, however they don't have the tabs on them to mount the radiator overflow tank. Otherwise they are the same. You can make them work with clamp on tabs. I'm pretty sure that the only subframes that will work are 98' - 02'. You can get aluminum subframes from aftermarket.

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