V8 Miata Chassis and Suspension Shocks, Springs, Steering, Control Arms, Bushings, Body Stiffening, etc.

Subframe Shim Question

Old 05-30-2016, 09:06 PM
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Default Subframe Shim Question

Hey all, finally took the plunge and got a miata shell! It's an NA not %100 sure of the year. Picked it up for dirt cheap and I have an explorer driveline just sitting around. So here's the catch, it's a V6 4.0 ohv engine (strike one I know) and I am trying to do this relatively quick and cheap (strikes twould and three).

So my question is does anyone have pictures or info on shimming the subframe? I need the engine to come down a bit more, doesn't seem like I could move it forward without serious mods to the subframe, and it doesn't appear that there is much I could take out of the oil pan. I have read that people have shimed their subframe as much as one inch for 5.0's, wondering if anyone here has ever shimmer their subframe that much?

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Old 05-30-2016, 09:54 PM
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The most I know of around here is 1/4". Not sure how you could do a full inch without it having the '60's gasser look. Unless you're planning on moving suspension mounting points, but that takes "relatively quick" out of the equation.
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Old 01-13-2019, 11:52 PM
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You can drop the subframe up to 3/8 of an inch (10mm). Any more than that and you will run out of thread on the front subframe mounting bolts. I dropped mine by 3/8. Use as little shimming as needed. I did not want to do mine...but hood clearance said otherwise
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