Dodge Trans.

[mbarn]

It appears to me that there are many well qualified and knowledgeable members on this forum therefore please permit me to solicit your thoughts on the following. 1) 1989 dodge cummins w/three speed at. Has been replaced or rebuilt 2 times, and is gone again. We tow a lot 2-3 tons, and do not abuse the truck, driving very easily. What transmission would you replace it with? The truck has only 134K on it.

2) Same questions with a Dodge Rollback D350 w/5sp Getrag. 110Kmiles

CTD. Transmission gone south and needs rebuild or replaced. What trans. would you install that can hold up to moderate loads? Thanks.

 

[MEby]

IMO go with the a nv4500. I really like mine. If you are going to bomb your truck, and maybe even if you dont. get it with a south bend clutch and maybe some performance features for the trans it self. as for as autos go, swap it for a manual trans.

 

[Philip]

Up to 6k lbs. that isn't much of load. Did the same person rebuild the trans both times? How many miles did it make on the rebuild's? What let go on each rebuild?



On a upgrade trans. I would look for a 47RH trans. It gives you OD and a lockup converter. With your 3:08's It would give a good cruise RPM. Around 1600 RPM at 60MPH.



On your rollback a NV4500 would be the easyest one to find. The NV5600 would give you better gearing. But it isn't in production anymore and parts are starting to get hard to find. The newer G56 used in the later 3rd gens would cost way to much.

 

[dpuckett]

Just get the Getrag rebuilt to factory specs (watch that preload on the bearings), and overfill it by 1-1. 5qts, and dont lug it (keep above 1700rpm loaded). I dont think the Getrag is any better or worse than the NV4500. Remember, 5th gear can back off in the NV4500s, and it is picky about which oil you put in it.



For the 727, find another shop, and keep the fluid & filter changed- every 15k or so.



If you swap for a NV4500, I'll take the Getrag



Daniel

 

[ctd8999]

727 no O/D and no Lock-up converter. Really should not have any issues towing the weights you are. Find another rebuilder.

 

[jimnance]

It appears to me that there are many well qualified and knowledgeable members on this forum therefore please permit me to solicit your thoughts on the following. 1) 1989 dodge cummins w/three speed at. Has been replaced or rebuilt 2 times, and is gone again. We tow a lot 2-3 tons, and do not abuse the truck, driving very easily. What transmission would you replace it with? The truck has only 134K on it.

2) Same questions with a Dodge Rollback D350 w/5sp Getrag. 110Kmiles

CTD. Transmission gone south and needs rebuild or replaced. What trans. would you install that can hold up to moderate loads? Thanks.

Your signature does not show where you are. The 727 found in your '89 is a fine transmission, but does not have a lock up torque converter. If you are pulling a lot in the hills it's possible you are getting the transmission hot. If so, consider an after market transmission cooler to keep the temps down. If you are a flatlander find another shop to do your next rebuild.

 

[JLight]

dodge trans

Het Fellas just a thought on the trans problem. My friend has a V10 with the od lockup and he was having all kinds of overheating and trans issues. Come to find out the coolant line from the trans to the cooler was pinched(rubber). Replaced the hose and walla! No more kicking out of od and overheating. Hope this helps with your situation. JLIGHT

 

[mbarn]

Thanks for advice to all of you. I have not made a decision as of this date, however I believe I will go with the Getrag rebuild. The other (at) will have to wait a while, since I am trying to get by on SS. Thanks.

 

[DieselTweaker]

On your 727 you need to find another builder. I have punished a 727! when set up right they are a very tough trans.



where are you from I might beable to recommend someone.



Zach

 

[mbarn]

Trans.

I'm located in the tidewater area of Virginia. Practically all flatland towing.

The last rebuilder I had had a good reputation, however I found he was using the cheapest kit he could find, probably an aftermarket kit if one exists. Will the 47RH bolt to the 89 Cummins without modification? Do any of you have any recommendations as to where to purchase the 47RH? Thanks again

 

[sdstriper]

47rh

The 1994-95' +/- year model 47RH is hyd. control, no electronics (computer etc). Your looking for that transmission and You would also need the Transmission to Engine Adapter and the Starter. If you search the TDR there is good reading on it.

 

[sdstriper]

Getrag rebuild

Thanks for advice to all of you. I have not made a decision as of this date, however I believe I will go with the Getrag rebuild. The other (at) will have to wait a while, since I am trying to get by on SS. Thanks.

You will want to contact Mysteryman for Getrag rebuilding "must do's".

 

[PToombs]

You will want to contact Mysteryman for Getrag rebuilding "must do's".

Or MMiller, he just did one with good results. There was quite a bit of it posted on here.

 

[Philip]

The 1994-95' +/- year model 47RH is hyd. control, no electronics (computer etc).

Better do some research. The 47RH uses a computer to fire the OD and lockup. I can post some pic's of the 47RH/A618 computer connection if you want to see it. It is a three wire plug in. The 518 uses a two wire plug to fire the OD unit. Both of these trans can be made to work witout a computer. But it still uses some form of electric control to cause the OD and lockup functions.



mbarn What is the 727 doing?

 

[sdstriper]

Better do some research. The 47RH uses a computer to fire the OD and lockup. I can post some pic's of the 47RH/A618 computer connection if you want to see it. It is a three wire plug in. The 518 uses a two wire plug to fire the OD unit. Both of these trans can be made to work witout a computer. But it still uses some form of electric control to cause the OD and lockup functions.



mbarn What is the 727 doing?

Please excuse my previous post as it was incomplete and could be misleading. I maybe should have said that the 47RH is the OD trans of choice if you desire OD, lock-up torque converter and ease of adaptation (if you can call it that). At least that is my opinion based on research from the TDR as well as other resources. The OD and lock-up can be controlled by vacuum and oil pressure switch, if you can provide enough vacuum and there are electric vacuum pumps that could be added for such a purpose. Instead of the electronic speed sensor and throttle position sensor you could use mechanical / hydraulic / electronic speed sensor and a vacuum / electronic throttle position sensor. It is possible and has been done already. Putting a 47RH in a truck other than 1994-1995 is not a direct bolt in and go, but can be done with the right knowledge and parts.

 

[Philip]

I maybe should have said that the 47RH is the OD trans of choice if you desire OD, lock-up torque converter and ease of adaptation.

There you go thats better.



Not that much more is needed. Just the bell adapter and a 2nd gen starter and a little work with a grinder on the frame around the starter area.



I'll be doing it some time this coming summer.

 

[sdstriper]

There you go thats better.



Not that much more is needed. Just the bell adapter and a 2nd gen starter and a little work with a grinder on the frame around the starter area.



I'll be doing it some time this coming summer.

Hey, someone has to keep an eye on me. FNG's you know...

 

[KOG]

I've towed as much as 27,800 gross with a stock 727, but that's behind a 360 gas engine. Gas is much easier on the transmission than diesel and that truck has 4. 10s with small dually tires and a BIG transmission cooler. Still, the 727 is the strongest 3 speed automatic known to man. Your rebuilds haven't been right at all.

 

[JStokes]

Can you please elaborate?

Please excuse my previous post as it was incomplete and could be misleading. I maybe should have said that the 47RH is the OD trans of choice if you desire OD, lock-up torque converter and ease of adaptation (if you can call it that). At least that is my opinion based on research from the TDR as well as other resources. The OD and lock-up can be controlled by vacuum and oil pressure switch, if you can provide enough vacuum and there are electric vacuum pumps that could be added for such a purpose. Instead of the electronic speed sensor and throttle position sensor you could use mechanical / hydraulic / electronic speed sensor and a vacuum / electronic throttle position sensor. It is possible and has been done already. Putting a 47RH in a truck other than 1994-1995 is not a direct bolt in and go, but can be done with the right knowledge and parts.

I am doing a Cummins conversion in a Suburban and was planning on manual switches for OD, and lockup. How can I automate this. If I do automate them when do they come on and turn off?

 

[cerberusiam]

I am doing a Cummins conversion in a Suburban and was planning on manual switches for OD, and lockup. How can I automate this. If I do automate them when do they come on and turn off?

IMO, you can use the Hobbs switches and such for vacuum and/or oil pressure but they are not real adjustable for tuning the shifts to your engine setup. The manual switches work quite well as long as you remember when and how to throw them but they are not user friendly to other people.



ATS has a standalone controller that will allow you install a 47RE in any application plus tune all your shift and lock up point via a computer interface. It requires a TPS and speed signal and 12 volts to operate. If you want a clean install and auto operation the ATS product would be a good choice. The con is the cost.



Some thing to consider.