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wagonwheeler 08-18-2006, 02:58 PM The tag on my turbo has only the numbers 138429. Doesn't have a GM X designation. What turbo is it? Is there a better GM turbo that I should keep an eye out for? Chaser Jasonsmack 08-18-2006, 03:39 PM You likely have a GM4. Maybe the numbers were printed on there and rubbed off? There is usually two or three lines of information on the tag in your picture. If you are hunting for a different turbo keep an eye out for a GM8. strictlydiesel86 08-18-2006, 06:01 PM You likely have a GM4. Maybe the numbers were printed on there and rubbed off? There is usually two or three lines of information on the tag in your picture. If you are hunting for a different turbo keep an eye out for a GM8. :iamwithst | ||