1985kenworth
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Hello i have a 2003 Gmc jimmy sls with almost 500,000km on it ..i bought it used with 153,000km on it.Recently within the last 2 weeks i hear a clicking sound under under the truck when you start it and it idles.When you drive the clicking gets faster but when the transmission shifts the clicking stops but as soon as its done shifting the clicking starts again.Also what is the average life of these trucks.This is my second one .i had a 98 before ..I really like these trucks and want to keep it but not sure because of the age and mileage..any help would be great