Autogear sells a 'M-22Z' Rockcrusher which is a M-22 with a lower low gear set. 1st is available with 2.97:1 I believe. You swap that in for your M-21 and exchange your 3.55s for a cheap 2.73 rear axle assembly and you get the same off the line launch and lower highway rpm. No new driveshaft or cutting the floor. There will be more drop in rpm between shifts. $2200 before shipping.
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