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  #11  
Old 11-28-2011, 08:58 PM
Tpellus Tpellus is offline
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I have 3.92 in my truck right now. Would going up to 4.10 make that much of a difference? I have an aftermarket exhaust on already, and am planning on putting a CAI on and then getting a tuner. Most people have recommended superchips.
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  #12  
Old 11-29-2011, 08:04 AM
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snrusnak snrusnak is offline
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Quote:
I have 3.92 in my truck right now. Would going up to 4.10 make that much of a difference? I have an aftermarket exhaust on already, and am planning on putting a CAI on and then getting a tuner. Most people have recommended superchips.
3.92 to 4.10 would be nearly no change. You'd likely want to go to 4.56. I have a superchips and love it, it makes a huge difference, but I have read some 4.7L guys in your year range that didn't like it and couldn't tell a difference.
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  #13  
Old 11-29-2011, 09:23 AM
Tpellus Tpellus is offline
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Alright, well then I will most likely skip gears, unless I decide to go to 35's once I am finished with my extremely long list of mods haha. Doesn't ever seem to end.
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Old 11-29-2011, 04:50 PM
440Magnum 440Magnum is offline
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Quote:
Originally Posted by snrusnak View Post
Your truck has two overdrives (4th and 5th gear). Most vehicles up until recent years basically all had the same overdrive gearing, which was 0.75. Your ram has that, but then another gear (0.67). This gives a lower cruising rpm for better mpg.
Just to clarify what snrusnak said, Your 545RFE transmission has SIX forward gears. Chrysler calls them 1,2,2',3,4,5 where 2' is pronounced "2 prime." In normal driving, the transmission shift pattern is 1-2-3-4-5, where both 4 and 5 are overdrive gears, and it skips 2'. The torque convertor locking and unlocking makes it really hard to tell a gearshift from a TC lock when you're driving and it seems like you can count about 7 shifts... but there are only 5 true gear changes Whenever you accelerate hard and the transmission has to downshift lower than 3, it picks 2' instead of 2 to give you better passing performance without winding the snot out of the engine. That's all 2' is used for until you factor in that little button on the end of the gearshift (or on the dash on some models).

Some years of Ram have only an "O/D OFF" option using the button on the end of the gearshift, but others also have "Tow/Haul" mode. When you pick T/H mode, the transmission shifts 1-2-2'-3-4, and all the shift points are moved up in RPM. It never goes into the 2nd OD (5th gear, the 6th ratio in the tranny). If you pick "O/D off," then it shifts 1-2-2'-3 where 3 is the direct 1:1 ratio gear (or it may just be 1-2-3, I'm not positive).
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Old 12-09-2011, 07:44 PM
f6boomer f6boomer is offline
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Default WOW, Great info

Thanks 440M, that's the best explanation of our trannies I have heard, wouldn't it be nice if someone standing in a dealership could tell you stuff like that!

TP, I think you are on the right track. Since you already have the 3.92 and only tow a few times a year, good maint, a few upgrades to the 4.7, and most important O/D off or Haul mode is the way to go.

Thanks again 440Magnum.
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