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Bill R,
I wonder if 3431295 was a production line part that never made it to the dealer. Chrysler would have assigned a new part number for a new part and put it in the Parts Book. But never put it in the supply chain because there was already a suitable substitute available, 2809013. That may explain the lack of NOS 3431295 pumps.

Just thinking out-loud.

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Closeup of Barry's pump markings.
335 9 = Dec 1, 1969

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Notice that this is a 1970 "down" outlet version pump!

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This was an area that we researched for months trying to find the reasoning for the various styles. One of the first things that someone needs to do is document and research ONLY original cars and their applications. You can reference all the NOS pieces in the world but remember that none of them were installed on a vehicle, so no conclusion can be drawn regarding their actual application. Every original 1970 vehicle that we inspected had the “down” style outlet. EVERY original 1971 vehicle we inspected had the “side” style outlet.
The E Body was a new vehicle for 1970. In that particular year, the outlet pointed down towards the frame rail on production line E bodies. As many of you know, this made it very difficult to remove or install the rubber hose.

In 1971, Chrysler redesigned the pump (side outlet) to help facilitate the installation of this particular part. It saved a lot of aggravation in trying to connect the hose for the workers on the assembly line. The problem with this scenario was that in 1972 Chrysler completely redesigned the E Body washer bottle and the early 1970 style pump worked better for the new design. Since the 1971 style ended up being a one year only part, the majority of NOS replacement pumps were manufactured to accommodate the majority of the manufactured years. (They were not concerned with how hard it was for someone to service or replace the part. That is why 99% of the NOS pieces have the down type outlet.) The “down” outlet version was used in 1970, 72, 73 and 74. I still have many of the old units (from the 1970 and 1971) that we removed from original E Body cars. As stated before, every original 1970 had the down type outlet and every original 1971 we documented had the side type outlet! Bill Rolik posted two pictures of original samples where the outlets point towards the engine compartment. I would guarantee that both of those units are from original 1971 vehicles.
Care to verify Mr. Bill?

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Yes, both are originals from my own vehicles. I will have their numbers and vendor codes tomorrow. By the way: Per our conversion earlier this evening...Get a real phone. Either that, or you did not pay your cellular bill

BR

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By the way: Per our conversion earlier this evening...Get a real phone. Either that, or you did not pay your cellular bill

BR

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Bill, I wouldn't know about that "not paying my bill" thing! Are you speaking from experience? (I have three other cell phones....maybe I should give you one of those numbers.) Talk to you later Mr. B!