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Old 05-24-2009, 06:19 PM   #1 (permalink)
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Upgrade from a 47RE to a 48RE or a 68RFE

I have a 47RE in my truck now, stock. whats a better upgrade a 48re or a 68rfe? on either transmission what would have to be done to get them to talk with the 5.9? and would the 68rfe even bolt up to the 5.9? last question where can i get good indepth info on both of those transmissions?
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Old 05-24-2009, 06:39 PM   #2 (permalink)
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The 68fre won't work. It would bolt up, but you'd need new driveshafts, transfer case input, crossmember, and nobody has come up with a stand alone controller for it yet. Why don't you just keep your 47re and improve it?
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Old 05-24-2009, 06:51 PM   #3 (permalink)
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The 68fre won't work. It would bolt up, but you'd need new driveshafts, transfer case input, crossmember, and nobody has come up with a stand alone controller for it yet. Why don't you just keep your 47re and improve it?
plus you cant build up a 68rfe really when the 48re can be made bullet proof
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Old 05-24-2009, 08:55 PM   #4 (permalink)
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hey thanks for the info. what can i do with my transmission to make it better? i like the tow/haul feature of the 48re
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Old 05-24-2009, 09:52 PM   #5 (permalink)
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I can't wait till they find a way to retrofit a 68rfe, when my stocker goes that is the way I want to go, for the extra gears!
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Old 05-30-2009, 12:07 AM   #6 (permalink)
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Bulletproof 48RE

How do I bulletproof my 48RE transmission?
It is a 2007 and I don't know if I should even go for it.
It seems to be working okay, but I get a vibration when I tow uphill.
Any ideas?
Thank you,
albert
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Old 05-30-2009, 12:11 AM   #7 (permalink)
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Originally Posted by NateWKTM300 View Post
I have a 47RE in my truck now, stock. whats a better upgrade a 48re or a 68rfe? on either transmission what would have to be done to get them to talk with the 5.9? and would the 68rfe even bolt up to the 5.9? last question where can i get good indepth info on both of those transmissions?
This is coming from a 6.7 guy. Don't even think about a 68RFE, Even if it did work that would be a stupid idea. The strongest built tranny on the road is a 48RE. Theres even one or two really fast Duramaxes running a 48re behind it.

There is nobody building a 68rfe that is proven beyond about 550hp.

There is nothing wrong with a 47RE, basically the same thing as a 48. You have a great tranny, talk to Goerend or Jeff Garmon.
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Old 07-19-2010, 11:52 PM   #8 (permalink)
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Want to upgrade my 46RH to 48RE, any ECU solutions out there?

Is there a control unit for this upgrade that can be setup, how can I control a 47RE's electronic governor, I think I can run the over drive with my ECU from my 46RH but the electronic governor? The 48RE is all electronic including the shifts 123 so unless there is a stand alone ecu I can get there is no way to work the 48RE, the 47RE with the hydralic 123 and OD is possible if I can handle the lockup and the governor??

I called Goerend a number of times wanting to buy a new 48RE trans for my application but they never called me back so I guess they don't want to sell me one for my 1975 classic dodge with 1992 Cummins Drive line, 2wd with 46RH. I wanted to buy it from them but they don't seem to want to sell one to me with my 12 valve 1992.

Some of you will remember my project;
Diesel World Magazine Article on the 1975 D200 Club Cab & Road Trip to Vegas Shoot

I have put 45,000 miles on it since I put it together back in 2006 and my 46RH has 300,000 miles on it now still factory sealed so I want to upgrade it before it fails on my on a long road trip. I would like the 48RE so I can install an exhaust brake and save my brakes on my unit. Since I built the truck I have upgraded the camper to a 11.8 foot Lance and I pull a car trailer as well see picture.

Any of you that can help me please respond or email me at reg_r@me.com. I own a race car shop in Canada and we do all kinds of software and ecu stuff but I would sooner not re-invent the wheel if some of you have already done this.

Thanks in advance.

Reg
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Old 07-20-2010, 01:22 PM   #9 (permalink)
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hey thanks for the info. what can i do with my transmission to make it better? i like the tow/haul feature of the 48re
The TH features of the 48RE are in the software not the transmission, all you will have is what you truck has.

Do a search here for trans upgrades and you will get tons of reading. We have beat this subject to death in the last 6 months or so. Lot of info and advice available.
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Old 07-20-2010, 01:56 PM   #10 (permalink)
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I am a tranny dyno tech and let me tell you the 48re will run laps around that hunk of crap 68rfe. And i can print pressure sheets to prove it.
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Old 07-20-2010, 02:26 PM   #11 (permalink)
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I am a tranny dyno tech and let me tell you the 48re will run laps around that hunk of crap 68rfe. And i can print pressure sheets to prove it.
Now before you sell that "hunk of crap" short JUST how many hours do you have acutally driving with it and using it? There is a HUGE difference between a 3 speed trans with an add-on OD and a purpose built 6-speed 3-planetary transmission. They do not, and should not, react the same way nor need the same tweaks. Apples to oranges here. There is an even larger discrepency in reading numbers on a dyno and a practical application.

Pressure charts are great but are useless without some refernece point, specifically surface area the pressure is applying to. Just because pressures are lower does not mean its bad, holding force is defined as pressure times area. If you increase area you get the same result as pressure increases. How about timing comparisons in shifting with these pressures? Slippage percents? Are the units built the same way?

A 6 spped auto is never going to shift like a 727 base transmission, period. A whole different approach in these cases. However, a good 6 speed transmission with a competent controller will run away and hide from ANY 48RE in many cases. THAT is what most of us look for in this swap.
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Old 11-06-2011, 11:14 PM   #12 (permalink)
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For some the people on here like to drive and tow there trailors not see how fast you can do the 1/4 on a strip. I have been trying hard to get a stand alone controler for the 68RFE and they have not come up with one as of yet. If you dont have the hole truck to swap it over and I mean everthing it be hard to get it to run right. There are company out there that build cans that could be wired and programed for that trany. The problem is money and time. I think if someone did do it they have a nice item for sale. To put the 68RFE the pilot on the converter is almost 3/8 inch bigger than the 5.9. I dont think that would be to hard to fix but if you go all electronic is there a chance of it going into reverse unstead of 6th gear at 70 mph or is that just crazy talk. you guys racing the allison 4000 or 3000 have double over drive and rated over 60,000 lbs but they are fat and 200 lbs heaver.
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