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  #41  
Old 09-21-2011, 03:27 PM
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Originally Posted by snrusnak View Post
See I'd rather spend a few thousand on the 66rfe than $1,500 on 4.10 or 4.56 gears, as I would rather have the 66rfe with my 3.55 than my 545rfe with 4.10 or 4.56! I could still change the gears as well.
I'm not claiming that the 66rfe is the best choice between the TCI six speed or the Nag1, but the old 68rfe is good for 650 ft lbs of torque, and the new one (68rfe) is good for 850! So I'm hoping that the 66rfe is good for at least 650 lbs as well. The TCI package is 7k plus, the Nag1 is 5k plus 1200 core charge unless you get a stage 11 or 111. So the price isn't all that bad for such a beefy trans considering the 545rfe is only 200 dollars cheaper and rated at what...450 lbs? Wait a few months out and you can get a good 66rfe at a salvage yard for a better price. And it won't be long til someone comes out with a good shift kit and valve body for it. I like it, if it works out with the programing I'm getting one.
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  #42  
Old 09-21-2011, 03:31 PM
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I don't have any worry of damaging my transmission, I'll never be above 400hp with the bolt ons I'm planning. I'm after the better gear ratios. I would do the same and snag one from a scrap yard years down the road....no use wasting thousands of dollars...

It all goes back to the programming though.
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  #43  
Old 09-21-2011, 03:31 PM
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Gear ratios only matter "if" you can get around TM and get the power to the ground,
Launch out of the hole better with a built transmission, yes better than any factory 8 speed due to the higher stall TC, higher line pressure, Better frictions and steels.

Without addressing those key issues, any stock transmission is still going to be crippled by Factory Torque Management.

For those who don't seem to understand how modern automatic transmission and torque converters operate:





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  #44  
Old 09-21-2011, 03:40 PM
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So would the converters for the 45rfe/545rfe fit the 66rfe? I don't want to buy a converter now for my 545rfe then if I swap to the 66rfe in a few years have to buy a different converter...
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  #45  
Old 09-21-2011, 03:46 PM
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Quote:
Originally Posted by BlackRamHemi View Post
Gear ratios only matter "if" you can get around TM and get the power to the ground,
Launch out of the hole better with a built transmission, yes better than any factory 8 speed due to the higher stall TC, higher line pressure, Better frictions and steels.

Without addressing those key issues, any stock transmission is still going to be crippled by Factory Torque Management.

For those who don't seem to understand how modern automatic transmission and torque converters operate:





I agree with you 100%, but this is about the gear ratios. I'd rather have a 66rfe than a funky geared 545rfe. I'm sure that a stall converter will soon be available for it, as well as a shift kit and better valve body. If I couldn't use the 66rfe, I'd go with a Nag1 with much better gears and spread. And we're not talking super charged or high hp builds, we're talking under 600 hp (426 alu crate) in my case and stock 4.7 in snrusnaks case. I know you know your chit so plz don't missunderstand me, lol! But the gearing in these 545's are robbing our potential hp, they plain out suck compared to the competition.
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  #46  
Old 09-21-2011, 03:52 PM
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Quote:
Originally Posted by snrusnak View Post
So would the converters for the 45rfe/545rfe fit the 66rfe? I don't want to buy a converter now for my 545rfe then if I swap to the 66rfe in a few years have to buy a different converter...
The 66rfe has a heavier duty converter. I won't know if they are interchageable for a couple of days. But I wouldn't use the one in your truck even if it were.
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  #47  
Old 09-21-2011, 03:54 PM
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I know they are different stock vs stock. That's what I'm wondering is if they are interchangeable....keep me posted with what you find out if you don't mind.

If they are interchangeable then why not use it? That doesn't make any sense...?
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  #48  
Old 09-21-2011, 03:57 PM
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Well I'm killing the competition at the track with just minor bolt-on's, all stock internals, and a 3000 stall TC from Edge.

Transmission gearing is a non issue for me, I'm getting 1.8xx 60' times
that's good enough to hang with SRT8 Jeeps running 6.1L and a Nag.

oh, did I mention I have an open rear diff with 3.55's?
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  #49  
Old 09-21-2011, 04:02 PM
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The stock jump from 3:1 to 1.67:1 sucks. Your 1/4 miles time would go down with closer gearing. Is it worth the hassle/money to swap? Probably not, and I probably realistically won't do it, but it's something to look into... You've mentioned it many times, but you also have 4wd. Are your fastest times in 4 or 2?
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  #50  
Old 09-21-2011, 04:21 PM
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2wd is faster but only by a hair, and only if track prep with traction promoter is perfect and track temps are not too cold.

If my first pass spins, I use 4wd auto (AWD) not 4Hi, for a better full throttle launch the following run.
The slightest rear tire chirp makes the e-clutch in the transfer case engage the front driveshaft to get me out of the hole and she squats like a monster truck and jumps out of the hole like a jack rabbit.
the front driveshaft disengages after launch so its not a full on 4WD run, that would be 2 tenths slower in 4WD lock (Hi).


THE ONLY way around Factory Torque Management programmed into a TCM to protect your transmission, is with an aftermarket Torque Converter with a higher stall. Trust me!

Launching at 3000rpm, almost at my peak Torque (3600), is 100% better than bogging the engine off the line at 2000.
its all about getting into the powerband as quick as possible without TM interfering.
Anyone who drives a stick knows if your rev's are too low you bog. Rev it higher when you dump the clutch and you are into the powerband quicker

I used go 2.4xx 60' , and down I'm down to 1.8's

Pre-launch rake vs post launch Squat


That's Significant Torque increase, that factory TM cant touch because its way beyond 2000 rpm before I've even left the line

a lower gear ratio in 1st will only help so much if the computer wont release all the HP and Torque past your stock torque converter because of TM.
also, More gears to shift through would most certainly not get my ET's down, LOL!

Everyone at the strip knows the 2 speed Powerglide is the king!

Here's my very first time slip for my 10' Hemi Ram, from July 2010.....
...(left lane) Stock converter, 2.402 60 footer BRUTAL! compared to my new Edge at high 1.8's low 1.9's
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