Finally: How to rebuild your 47/48re - Page 5 - Dodge Cummins Diesel Forum
94-98 Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect...NO ADVERTISING

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post #49 of 57 (permalink) Old 01-04-2016, 02:02 PM Thread Starter
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Glad people are still getting value out of this thread.

As an update, almost 3 years later the tranny is still operating flawlessly.


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post #50 of 57 (permalink) Old 01-04-2016, 11:23 PM
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Quote:
Originally Posted by BAXY View Post
too tight here and it will slam into reverse
correct me if I am reading this wrong...

first, the springs can be orientated in fashion that allows
(1) use of more springs
(2) or add 1 spring totaling 10, but grouped in pairs

these additions are for a faster / firmer 1-2 up shift ? correct ?

does the addition of springs cause a harsh reverse engagement as well ?

I was under the impression that an additional spring was a good thing, but I would not want a harsh reverse engagement ???

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post #51 of 57 (permalink) Old 01-05-2016, 01:51 PM
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Great job. The only real issue is not addressing input shaft end play. It is checked before removing or disassemble of trans. It gives you a ideal of wear in thrust washers, ect. Try and reduce end play by using thicker spacer between input and intermediate shaft. Also the spacer on output shaft will affect. Thickness of OD spacer riding on OD piston is for adjusting OD direct clutch release.

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post #52 of 57 (permalink) Old 01-05-2016, 11:02 PM
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The gear train thrust washers should always be replaced, especially in the 48RE. Gear train end play is very important and you'll be loose if you reuse the thrust washers. Sonnax makes shims to tighten the gear train on the 46's and 47's, but not the 48's.

The forward clutch Belleville spring (the plate that he couldn't remember the name of...) should always be replaced at overhaul.

Also, the write up says to install the low roller clutch dry. You'll definitely want to lube it (and the OD roller clutch, also) with ATF before you install it. They both should also be replaced at overhaul.

It's also very important to replace the direct drum bushing at overhaul. This bushing locates the drum on the stator support. Any unnecessary play here and you can run into sealing ring problems and and up leaking direct (3rd gear and reverse) oil.

I'm not being critical here. Heck, most guys wouldn't even attempt to go into their transmission... Hat's off for that...! I'm just trying to add a few pointers...

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post #53 of 57 (permalink) Old 04-30-2016, 01:52 PM
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Is there a way to remove overdrive or lockuyp control from the ecm? I have a 98 12 valve with a 47 re and I'm eleminating as much ecm/electronic control as possible.
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post #54 of 57 (permalink) Old 05-17-2016, 12:36 PM
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post #55 of 57 (permalink) Old 06-06-2016, 07:07 PM
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Quote:
Originally Posted by ls32500cummins View Post
Is there a way to remove overdrive or lockuyp control from the ecm? I have a 98 12 valve with a 47 re and I'm eleminating as much ecm/electronic control as possible.
If you really want to you would need to back down to a 47rh, this would take the OSS input out. currently the tranny speed is measured by the OSS, which inputs to ecm, then ecm also take TPS, VSS, Tach signals along with pressure and temps from vb. Ecm then send info back to gov solenoid and modulates pressure.
In the RH version, the gov press modulation is performed by a mechanical fly weight ( gov) mounted on the overdrive output shaft. Both the RE and RH use same OD and LU solenoids, just that the electrical connection is different, the RH connector is smaller as it only controls the solenoids.

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post #56 of 57 (permalink) Old 10-24-2016, 06:47 AM
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This is a fine thread, well done and informative; But To help out us home rebuilders this you tube video series is detailed.

https://www.youtube.com/channel/UCXq...bb0QKnP2Owo3nA

I just wish he had info on setting up OD spacer and intermediate shaft end play.

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post #57 of 57 (permalink) Old 10-24-2016, 06:57 AM
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Quote:
Originally Posted by Keleko17 View Post
I am going to try to bring this thread back to life. I tried to help a buddy do what we thought was a simple fix today. His truck is having trouble shifting into 4th, and overdrive. Quick searching pointed to a couple solenoids. That is what I tried to help with.

We dropped the pan and planned a quick swap of them. Once the pan was on the ground we found a spring about the diameter of a pencil, a little over an inch long, and when compressed it was just about a half inch.

Neither of us are transmission savvy. We searched for YouTube vidoes, photos, anything we could to possibly find where it belongs. We could only come up with one location that looked right. I couldn't find a photo to give a clear picture of the location, until now. We slid it over the piston type device.

Can anyone tell me what that thing does? Or where a spring about that size might go?

wll, the valve body is FULL of little springs, I'm sure that you figured out where the spring came from, check out this instructional video https://www.youtube.com/channel/UCXq...bb0QKnP2Owo3nA
I think #6 is VB rebuild.

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