48RE Troubles

[KiloCummins04]

I have an 04 RAM 3500 as in the signature below.

I just finished trans rebuild and install, and the transmission was built by a local shop using a lot of parts I specified since I didn't have time to do it this go around.

The truck ran great for a few days with excellent power.

I drove it to get some things, pulled out on the highway, got to the store, and shut it off.

When I came back out, it seemed fine in the parking lot.

I went to pull back out on the highway, and it was majorly slipping in 1st.

I'm not sure if it slips in second as well, as I can't even feel it shift, but at around 35-40 mph, it gets back to normal.

You can't get it over 1400 rpm on the way up, or it'll run up and do nothing.

The fluid is full, and it has a brand new DPC billet triple 1800 stall converter.

It ran fine for a few days, so I'm honestly at a loss.

I'm going to recheck the shifting linkage and TV cable tomorrow as my shifting linkage seems like it's just a touch off in a few gears like I have to shift it then wiggle it to get the square to pop up on the dash around the letter sometimes, but it goes into gear positively.

It moves on its own when you put it in gear slips when power is applied.

I tried shifting to one; it is pretty much the same; you can feel a little more shudder than trying to grab.

Anything else I should look at before I pull the pan off or pull this whole thing out?

It's got all billet shafts and servos and accumulators.

The guy who built it said he would get back to me tomorrow as well.

If this isn't something simple, I will sell it or put an NV5600 in this damn thing.

I had a perfect trans that lasted a few years before an accident cracked the case, and ever since, it has been a nightmare.

Thank you guys in advance!

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[AK Bob]

I have an 04 RAM 3500 as in the signature below.

I just finished trans rebuild and install, and the transmission was built by a local shop using a lot of parts I specified since I didn't have time to do it this go around.

The truck ran great for a few days with excellent power.

I drove it to get some things, pulled out on the highway, got to the store, and shut it off.

When I came back out, it seemed fine in the parking lot.

I went to pull back out on the highway, and it was majorly slipping in 1st.

I'm not sure if it slips in second as well, as I can't even feel it shift, but at around 35-40 mph, it gets back to normal.

You can't get it over 1400 rpm on the way up, or it'll run up and do nothing.

The fluid is full, and it has a brand new DPC billet triple 1800 stall converter.

It ran fine for a few days, so I'm honestly at a loss.

I'm going to recheck the shifting linkage and TV cable tomorrow as my shifting linkage seems like it's just a touch off in a few gears like I have to shift it then wiggle it to get the square to pop up on the dash around the letter sometimes, but it goes into gear positively.

It moves on its own when you put it in gear slips when power is applied.

I tried shifting to one; it is pretty much the same; you can feel a little more shudder than trying to grab.

Anything else I should look at before I pull the pan off or pull this whole thing out?

It's got all billet shafts and servos and accumulators.

The guy who built it said he would get back to me tomorrow as well.

If this isn't something simple, I will sell it or put an NV5600 in this damn thing.

I had a perfect trans that lasted a few years before an accident cracked the case, and ever since, it has been a nightmare.

Thank you guys in advance!

Sorry to hear about your transmission troubles; hopefully, the guy who built it will have some answers for you tomorrow.

Unfortunately, I don’t have any useful knowledge on the 48RE to share.

Please keep us posted.


2014 RAM 3500 (Aisin) 3.73 4X4 Limited Crew Cab Long Bed DRW. Oil Bypass Filter, Fuel Filtration Kit and 50 Gallon auxiliary fuel tank.

Sent from my iPad using Tapatalk

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[KiloCummins04]

I have a newborn, so I'm off work for 3 more weeks, luckily.

My guy hasn't gotten back to me yet.

I did find troubleshooting stuff in the repair manual.

I will do everything I can do without dropping the pan first since it takes about 120 of fluid.

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[KiloCummins04]

Does anyone have any experience with a similar issue?

I saw some other places where they said to adjust the front band, but that shouldn’t have much to do.

The trans has less than 100 miles on it.

I checked the front band and shifter linkage and all just for S&Gs, and everything seems to be in check.

It slips if more than 14-1500 rpm in D, but it shudders like it’s trying hard to grab in manual 1 then takes off.

I’m wondering if the rear(forward) clutch or overrunning clutch is defective.

I’m going to pull it apart Tuesday, so I’ll let you guys know what I find in the pan and what the results are

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[KiloCummins04]

just an update.
pulled the pan and found clutch material/metal in the pan.
good news is that my converter is ok and the fluid inside it wasn't dirty and everything is working as it should.
the guy who put it together for me is going to tear it down and make it right.
he said sometimes the snap rings mess up even though I went with the new style upgraded ones.
the forward clutch and over running clutch were faulty.
going to put alto red back in there and add an extra one to the forward clutch.

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