Tranny Fluid MOD - Ford Powerstroke Diesel Forum
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  #1  
Old 07-20-2009, 04:45 PM
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Tranny Fluid MOD

OK - Tell me I'm crazy - lots of research on the 5r110w tranny. Did fluid flow tests, added an Aux fanned Cooler and a Mag-Hytek pan - Still running 210 - Shift and fuctions are fine.

Here's what I know:
Flow test good, IF I block the tranny inlet. (otherwise Fluid is also pumping OUT of the inlet). From all reading, I believe the Fluid Bypass Valve is bad - on this tranny, it is an internal pump part, requiring tranny rebuild - Local tranny shop says just let her burn, then rebuild

Here's my MOD.....
Since I now have 2 coolers running, and essentially 2 lines pumping fluid out of the tranny against each other - I'm going to cut the line and run a fitting back into each side of the Mag-pan.... thus having cooler fluid pushing back into the tranny from 2 lines instead of working against each other and creating a "no-flow" I figure it can't make it worse

Thoughts?
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Old 08-02-2009, 01:22 PM
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I'm not 100% sure on the 5r110w, but on some other Ford trannies, you will have fluid pressure at both cooler lines untill the trans reaches a certain temp, then a temp valve starts sending fluid thru the cooler.
What do you mean, "block the tranny inlet".?
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Old 08-02-2009, 05:11 PM
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Ran a flow test when fluid was hot - fluid pumped out of both ports. I threaded a nipple and cap into the inlet port and ran the flow test again - Got 1 Qrt in 12 secs or so. Leads me to believe the pump bypass valve is worn and keepint the fluid pressure on bloth lines at all times

When I did as above in post #1 - I did get a 10 degree drop, Today, I put the Tranny lines back as stock and am now running an aux pump - pulling fluid out of 1 side of the pan, running thru the Aux cooler, and back into the pan - I'll let ya know If I get cooler gauge readings this week.
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Old 08-02-2009, 05:25 PM
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Wow, I have never heard the likes. I am very interested to see where this one goes!
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Old 08-02-2009, 05:37 PM
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with you sct can you read the tranny temp though the computer. cuz if its true about both lines having pressure till it warms up then it my be thinking that the tranny is still cool. but i dont know anything about how these trannys work so dont quote me on that. and if a tranny shop tells you to go till it burns then it sounds like the are seening $$$. but if i were you i would try to find another shop that will work on the thing befor you blow it.
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