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There are different pumps. Take yours with you when you get one to make sure every thing is the same on it. I went through this in the '80's with a truck I had. The pulleys didn't line up on the new one
Truck pumps have a 3/4" shaft. Car pumps are 5/8". Shaft length is also different, requiring a different pulley offset for each. The pump and pulley assemblies will interchange and a car pump will be a little more future proof since they are more commonly available and aftermarket pumps have been made, and probably will be made again for car applications.
The only problem with the car setup is that the stock pulley is too big, turning the pump and fan really slowly at idle which is not good for cooling. The pulley bolt pattern is very common, so finding an aftermarket or other application pulley should be pretty easy.
Thanks for responces! Do you mean to say that the 3/4 shafts are a different length from the 5/8 shaft or that there can be different length'swithin the same shaft diameter? The reason I ask is because this 3/4 ton 4x4 of mine has quite a few difference's when it comes to parts. For instance the clutch and brake pedal pads are a different size.So I thought before I buy a water pump I should ask around.
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