SPC Performance ZINC SHIMS 3.5x6.25x3.5 deg.

SPC Performance ZINC SHIMS 3.5x6.25x3.5 deg.

Marsoni

M251S

$106.18

Get it in 3 business days with 1 day shipping. Friday, May 29

SPC Performance ZINC SHIMS 3.5x6.25x3.5 deg.These over the road heavy duty truck axle shims are a fast a nd accurate means to align front or rear axles of most popul ar tandem trailers and trucks. Specialty Products' new Zinc Alloy shims offer another level of performance versus our tr aditional aluminum shims. For a small cost increase versus a luminum, you now have the hardness of our premium manganese bronze shims and a much improved compression strength as com pared to aluminum shims. NOTE:

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I have a ‘22 6.7 Powerstroke w/27k and pull heavy trailers in FLA. I’m worried about the (disco party). John I believe from the Ford Dealer in Hereford, Tx recommended this. I run 2 oz per fill and will see what happens. I’ve got Five fill ups on it now and seems to help responsiveness. Proof will be in the pudding. So far I’m pleased

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Reviewed in the United States on April 9, 2026

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ReevesRacing

Omaha, US

★★★★★ 5

Quieter and more mpg in TDI

Size: 1 Count (Pack of 1)

Didn't really believe the hype. Did a little research and watched Project Farm and decided to try. Im not a snake oil guy....but I will say my 2013 common rail TDI is quieter and I get a tad more fuel mileage. Does it pay for itself? Well, it does get better mpg, but I feel the reduction in noise most likely relates to less wear and tear and thats good enough for me. Im only using 1oz per fill up (about 14 gallons) so it lasts a very long time. I get 40mpg and im not light footed.

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Reviewed in the United States on April 2, 2026

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James Jay

Battle Creek, US

★★★★★ 5

It's a spark plug

What i needwd

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Reviewed in the United States on May 27, 2026

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Chelsea, US