Just changed rear axel assembly on my 99 silverado, test drove it today and the truck shakes when you reach 55 mph. any suggestions would be great! i did put a new u joint in when changed rear end.
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A shop didnt find anything? You have a suspension problem Lets start at the tires is there any mud or crude that affect the balance of your tire? What about wheel bearing is there side to side movement even with the rear,How about the upper ball joint and lower ball joint . a warp drive axle can cause this . If you are certain of there inspection with the suspension the problem is the torque convertor. If that stays lock up whoa you will be shaking like big time
Make sure the fuel filter is clean. You may need to drive it with a fuel pressure gauge. Fuel pressure should be 55-62 psi. It its lower , the fuel pump may need to be replaced. Replace the fuel filter. Replace the filter every 10-15k miles.
Check your tire balance. When you have an out of balance tire or a belt in the tire has shifted you will experience a shacking only at a certain speed.
have a 1998 K3500 silverado 4x4 with 454 motor and 4L80E transmission. I can not get over 55 or 60 mph. At that speed the transmission down shifts from 4th (OD) to 3rd. The speedometer also drifts from about 50 to 65. If I try to speed up it will down shift to 3rd. I have replaced the VSS on the trasfer case. Is there another speed sensor somewhere? Or could it be the TPS? The truck drives and shift normal up to this point. where should i look next. thanks
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