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Custom Dodge Ram Performance Mods - Engine - 4.7 Liter V8 Discuss modifying your Dodge Ram with Performance Parts and Accessories!
Factory Spec: 4.7-liter V8 engine - 310 horsepower, 330 lb-ft of torque.


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  #1  
Old 11-20-2013, 08:05 AM
Hornet Hornet is offline
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Default Tranny thermostat

Sean or anybody,have you ever seen a pic of the factory transmission thermostat.

I'm starting to wonder about mine and the aluminium block that all my tranny lines feed into.

I've read a few threads now where guys are usually running under 160 on tranny temp,mine doesn't run anywhere near those temps,i'm well above 190 even easy driving.

And now i'm curious about that block,and whether it might be a thermostat controller.
Rick
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Old 11-20-2013, 05:51 PM
Hornet Hornet is offline
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Took the part number off the aluminium block (55111005AC) and phoned my local dealer with it,and it turns out to be a bypass valve for the tranny cooler,crap crap crap.

Has anybody ever tried bypassing the valve /disabling it or even insulating it to keep it hotter.
I'm assuming it's either nothing more then a bi-metal style spring temp controller or a calibrated orfice hole.
But that explains my tranny temps now.
Rick

Last edited by Hornet; 11-20-2013 at 06:29 PM. Reason: add info
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  #3  
Old 11-22-2013, 05:47 PM
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snrusnak snrusnak is offline
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Not sure but why would you want to change it? It should only help. You can PM transengineer he can answer ANY transmission related question(and most others) about these trucks. Take advantage of him...(not like that...)
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  #4  
Old 11-22-2013, 06:56 PM
Hornet Hornet is offline
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I'm putor stupid Sean,how do you pm him if you can't find a post by him.

Personally i don't like my tranny temps low temp being around 190 and it's high temp well over 200,that's too hot for longevity,great for gas mileage,but i'm more interested in keeping the tranny alive for a couple hundred thousand miles.
Easier to bite off a dollar more in gas costs weekly then put a tranny in at 50,000 miles,and these trannies have a poor rep as far as i can tell

Last edited by Hornet; 11-22-2013 at 07:00 PM.
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  #5  
Old 11-23-2013, 12:32 PM
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snrusnak snrusnak is offline
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I sent him a message with a link to this thread. Yeah I hear you, I don't think your temps are excessive but I understand. The 545rfe/65rfe is actually a really good transmission when used in it's design parameters. I rarely see someone post about a damaged transmission unless they are turbo, blown, or spraying.

Fred runs 12's in his ram on nitrous and IIRC he uses a stock transmission. I believe he said he tried aftermarket ones but they didn't hold up so he just throws stockers in there when they go. I think he's gone through a handful in over 200k miles, but he probably has about 450rwhp.
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Old 11-24-2013, 08:40 PM
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Thanks Sean.

LOL,yes i don't think a 4.7 would ever hurt the tranny powerwise.
Wearing out rear tires isn't a big worry on mine.

I just don't like the temp it runs at,it doesn't take much of a hill to get it running close to 200 degrees,and if i push it hard in the mountains,it'll go to 205.
Rick
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Old 11-25-2013, 09:26 AM
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See my post here for my opinion:

http://www.ramforumz.com/showthread.php?t=154470
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Old 11-25-2013, 01:26 PM
Hornet Hornet is offline
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That takes me to a post on the 8speeds hard downshifts TE.
Didn't see anything by you in the 3 pages of the thread.

Basically what i want to know,is can i remove the bypass valve that's in the tranny cooler lines,and connect them together using rubber transmission line,with-out setting off a code.
Everything on mine looks identical to my buddies 4X4 except his doesn't have the aluminium bypass block.
The block sits behind the grill,and there's only hard lines feeding it,no electrical connections.
I'm assuming it's probably a calibrated orfice hole,that lets more fluid through to the cooler the hotter the fluid is.
Thanks for your time
Rick
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Old 11-25-2013, 02:28 PM
TransEngineer TransEngineer is offline
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Quote:
Originally Posted by Hornet View Post
That takes me to a post on the 8speeds hard downshifts TE.
Didn't see anything by you in the 3 pages of the thread.

Basically what i want to know,is can i remove the bypass valve that's in the tranny cooler lines,and connect them together using rubber transmission line,with-out setting off a code.
Everything on mine looks identical to my buddies 4X4 except his doesn't have the aluminium bypass block.
The block sits behind the grill,and there's only hard lines feeding it,no electrical connections.
I'm assuming it's probably a calibrated orfice hole,that lets more fluid through to the cooler the hotter the fluid is.
Thanks for your time
Rick
8-speed harsh 2-1 coastdowns: Still gathering some information on that issue.

Thermal bypass valve: Yes, you can remove it and reconnect the lines without setting any faults. There is a wax motor inside the TBV, that recirculates all the flow directly back to the trans (no flow to cooler) when the oil is cold, and then when you reach a certain temp range, it opens and allows flow through the cooler.

Just make sure you connect each of the "trans side" lines to one of the "cooler side" lines...
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Old 11-25-2013, 06:51 PM
Hornet Hornet is offline
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You made my day.
Thank-you.

A wax motor,heard of them,but not familiar with them.
Can you go into a bit of depth on how they work,i'm curious?

It's nice,the blocks marked in and out,so even i shouldn't be able to screw it up,lol

The trucks only a summer driver,doesn't see snow or ice.

Next time i have the grill out,it'll be coming out.
Rick
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