Water Pump/Pulley Question

I've been trying to sort out the differences between water pumps and pulleys through the model years. I have an '85 600 ragtop with a 2.2 T1 and a 2.5 T1 on an engine stand that will eventually go in the car. From what I understand, the water pump and pulley of the '89 CB was an oddball and only used that one year. '90 had a bigger pulley bolt pattern. What I was wondering was if the pulleys from '90 and up cars had the same diameter and offset. In other words, if I put a '90 water pump/pulley on an '89 CB, will it play nice with the rest of the '89 belts and pulleys or do other things have to be changed?

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Originally Posted by dodgeboy77

In other words, if I put a '90 water pump/pulley on an '89 CB, will it play nice with the rest of the '89 belts and pulleys or do other things have to be changed?

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Nothing else need to be change. How is your alternator adjust bracket? The tear drop bushing underneath the alternator? If in poor shape, get solid replacement from Rich. http://rbryant.freeshell.org/misc_products.htm

I am using a 1989 common block water pump on my 1988 T2 long block in my 1986 Lebaron convertible. I did that primarily to get more wrap on the alternator pulley. The reverse rotation pump allows for a lot more wrap on the alternator.

I had used any combination possible at this point I think. So long as you match the water pump to the belt style it was meant to be with, you should be good.

Good information everyone!

<<I had used any combination possible at this point I think. So long as you match the water pump to the belt style it was meant to be with, you should be good.>>

Do '89's and '90 up use the same belt?

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Originally Posted by dodgeboy77

Good information everyone!

<<I had used any combination possible at this point I think. So long as you match the water pump to the belt style it was meant to be with, you should be good.>>

Do '89's and '90 up use the same belt?

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It's the same style and I've always used the same belt.