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Old 01-21-2010, 12:16 AM   #1 (permalink)
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Whats the Difference 47RH 47RE

Having a hard time explaining the diff between the 47rh and the 47re. -The 47RH was replaced by the 47RE. (The 4 was the number of gears, including an overdrive; the capacity rating of 7; R for rear wheel drive; and H for hydraulic control, or E for electronic control, though the substitution of E for H was more of a coding change than an engineering change).-

So they both have an electronic O/D lockout and are hydraulic shift controlled in gears 1-3. (O/D is electronic on both). Same convertor? So its simply a name change?
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Old 01-21-2010, 06:00 AM   #2 (permalink)
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The RE went to governer solenoid and sensor to control pressure. The RH had to governer in tail shaft and was mechanical. The easiest way to tell the difference is the plug where wires plug into trans coming from PCM. The RH has a 4 pin not quite flat like a trailer connector and the RE has a round 8 pin plug. The RH uses an external fluid temp sensor while the RE has a thermistor inside of the governer pressure sensor. The RE uses a combination of hydraulic pressure and PCM inputs on lower shifts. The RH has total hydraulic lower shifts. I've never put the two side by side, but I've heard the RH is a little longer. They do both take the same converter and most internals are the same. The two big changes are valve body and tail shaft. The numbers you have above are correct except for the "7", it stands for the trans being rated at 700 ft lbs torque. Some of the parts in trans can handle this much torque, but the converter and clutches don't like it for long. The transmission is basically the 727 torqueflite with and OD and lockup converter.
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Old 01-21-2010, 06:09 AM   #3 (permalink)
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The RE went to governer solenoid and sensor to control pressure. The RH had to governer in tail shaft and was mechanical. The easiest way to tell the difference is the plug where wires plug into trans coming from PCM. The RH has a 4 pin not quite flat like a trailer connector and the RE has a round 8 pin plug. The RH uses an external fluid temp sensor while the RE has a thermistor inside of the governer pressure sensor. The RE uses a combination of hydraulic pressure and PCM inputs on lower shifts. The RH has total hydraulic lower shifts. I've never put the two side by side, but I've heard the RH is a little longer. They do both take the same converter and most internals are the same. The two big changes are valve body and tail shaft. The numbers you have above are correct except for the "7", it stands for the trans being rated at 700 ft lbs torque. Some of the parts in trans can handle this much torque, but the converter and clutches don't like it for long. The transmission is basically the 727 torqueflite with and OD and lockup converter.
The 7 does NOT mean it handles 700 ft-lbs. The 7 was a torque capacity rating.

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Last edited by patracy; 01-21-2010 at 06:12 AM.
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Old 01-21-2010, 06:32 AM   #4 (permalink)
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The 7 does NOT mean it handles 700 ft-lbs. The 7 was a torque capacity rating.

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I read that 700lbs somewhere, but now I can't find it. It sounded mighty high to me, but where I read it sounded like a trustworthy site. Since it did sound high, that's why I added above the trans wouldn't live long with that kind of torque even if was "supposed" to. Just goes to prove again you can't believe everything you read.
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Old 01-21-2010, 07:38 AM   #5 (permalink)
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I read that 700lbs somewhere, but now I can't find it. It sounded mighty high to me, but where I read it sounded like a trustworthy site. Since it did sound high, that's why I added above the trans wouldn't live long with that kind of torque even if was "supposed" to. Just goes to prove again you can't believe everything you read.
Yup, otherwise we'd be simply buying A999's for our trucks.
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Old 01-21-2010, 08:05 AM   #6 (permalink)
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The electrical connector for the RH has three pins. 1 is OD, 2 is ignition on 12 volts, 3 is TC lockup. I don't know what the pins are on the RE. The tail shaft is quite a bit shorter on the RE.
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Old 01-25-2010, 05:19 PM   #7 (permalink)
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I actually just got off the phone with a tech at TCI who claims that the trans in my 1994 Ram CTD is of the 518 variant and since its not the 618 the convertor wont fit? Even though they are both 23 spline.
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Old 01-25-2010, 05:20 PM   #8 (permalink)
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Is this guy right??
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Old 01-25-2010, 05:21 PM   #9 (permalink)
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not to steal this or anything but whats in take to put a 47re in a 47rh truck?
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Old 01-25-2010, 06:32 PM   #10 (permalink)
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Question, depending on what transmission it is, either 47RE or 47RH, what years came with what??
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Old 01-25-2010, 06:50 PM   #11 (permalink)
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not to steal this or anything but whats in take to put a 47re in a 47rh truck?
You'll at least need the PCM and wiring harness for 47RE. I've read the RE is shorter, so you will also need driveshaft/s and possibly crossmember.
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Old 01-25-2010, 08:27 PM   #12 (permalink)
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Question, depending on what transmission it is, either 47RE or 47RH, what years came with what??
'94&'95 came with a RH, newer with an RE
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