All they do is keep the oil from flowing the reverse way when the pump is off, so it doesn't need to refill for take off. it's purely a convenience thing, that unfortunately due to the design, causes melt downs in high mileage trannies.

We used to have a few Trans techs on the forum and they wouldn't warranty tranny work unless the user agreed to removal of the check valves. That tells me they've seen more than 1 or 2 failures due to the valve.

 

Gotcha!


Still don't know why we have one in both lines but it would keep the oil full either way. Instead of just removal, why not just install a in line magnetic filter/check instead? Now one question is this:

The check valve is installed to keep oil from back flowing into the pan (dry system). So lets say you park for a week the start it up, thats like starting a motor with no oil (not a great idea!). It does make a great point about getting gummed up blocking flow. I think I would rater replace it with the magnetic filter/check and install a manual temp gage. If the trans line got plugged you would know it because you would loose most all power?

 

It's not the same as dry starting and engine.

In this case it would function more like a hydraulic jack with no fluid; the TC won't transfer the work until it's full of fluid.

I really have no idea why the D has two check valves. That just doesn't make sense to me. I would think that perhaps an in line oil filter would work quite well. You could probably add one of those oil filter magnet covers to the outside of the filter to collect more. Or a magnetic drain plug. There is a donut magnet in the bottom of the Ram tranny pan already.

 

a plugged line would just keep the trans fluid from shedding heat at the radiator and over a long trip tranny temps would reach the point to where the fluids and then the parts start to break down and fuse together.

 

This is what I'm talking about:
http://www.emergingent.com/subpage1Magnefine.htm

http://www.thedieselstop.com/archive...o=&fpart=1.htm