48RE Trans Help

[gathomas]

At 187K I lost first gear this was July 28,2012, took it to Rebuilder in OH that I was referred to by trans parts supplier

that has a relationship with rebuilder. On 8/1/2012 I got my truck back,put approx 3K miles on no problems.



about 3 weeks later while driving 50 mph in OD... ATF overtemp warning light flashes on/off several times, at same time

trans is trying to downshift repeatably. Took truck back to rebuilder, he scanned trans for data. found no codes.

Rebuilder replaces one solenoid, he called it a combination sol, it controls atf warn light.



Now, a week later, same problem as above resurfaces, along with No First gear, Rebuilder still has my truck scratching

his head. Would speed sensor on tail housing contribute to this problem??



Cerberusiam, feel free to comment please. !! Thanks, Glen Thomas, Beaver,PA

 

[fox]

If you lost 1st gear you also lost all forward gears.
EDITED!

 

[cerberusiam]

Do you actually have no first gear or you just can't get it to downshift at any time? From the sounds of it new transducer, gov solenoid, and output shaft speed sensor time.



Yes, the speed sensor messed up will cause them start and stay in drive with no downshift. Mess up the OD holding also. Same can be said for gov solenoid. If it sticks high no downshifts, ever.



There is no combination sensor and solenoid. There is the transducer that reads temp and gov pressure but it sets nothing. The solenoid actually sets the pressure based on wheel speed and feed back from the gov pressure sensor. Its a feed back loop. The TCM monitors pressure and tells the solenoid where to set using a table based on wheel speed. Crude but it works most of the time.





No, you can loose 2nd and still have all the rest of the forward gears. 2nd gear is just front band apply with the direct clutches off. Depending on what causes the loss of second that is. Blow the seal on the front servo and it will never get out of 1st if it moves at all, but, break the band and it will just jump 2nd into drive and keep going.

If you lost 2st gear you also lost all forward gears.

 

[Sled Dog]

http://www.goerend.com/ Call, speak to Dave, the Owner!


Why choose Goerend Transmission Inc?

They are one of the few transmission companies to offer a 3 year/100,000 mile limited warranty on all of the heavy duty transmissions they sell. The quality, dependability and performance of their products allow them to offer this free of charge.

They build their own torque converters, in-house, using precision ATI equipment. These high quality parts also carry warranties from Goerend Transmission Inc. , up to our Exclusive LIFETIME warranty on triple-disc converters.

Unlike many transmission companies, they have invested in several on-site specialty tools that allow them to analyze and test transmissions beyond what their competition can do.

While many consider them `Eastern Iowa's High Tech Specialists` they operate Nationally. Their satisfied customers can be found all over the globe, from internet diesel truck forums to the local drag strip.


The factory transmission in a Dodge Ram pickup leaves much to be desired. Poor fluid coupling in the Torque Converter results in excessive heat, lost power and less than optimal fuel economy. These deficiencies are accentuated when a load is placed on the truck. To make these transmissions stand up to the torque of the Cummins Diesel and V10 engines will depend on a several factors. The first being: what is the truck used for? A truck that is used for a daily driver with minor performance enhancements will not need the same transmission as a truck commonly loaded with a gross weight of 20,000 pounds.

I'm a Happy customer!

Note: with just a 3D converter and valve body, you won't believe your driving the same truck.

 

[cerberusiam]

http://www.goerend.com/ Call, speak to Dave, the Owner!

Good luck with that. :-laf You will be lucky to get a call back a week later. Davbe quit answering the phone several years ago except for existing customer and special cases, chiefly when he is not swamped, which is never a snear a sI can tell. Goerends has pretty much quit doing complete units and is concentrating on parts and a builder network. If your lucky its a 3 month wait to get into the shop.



Not that Dave doesn't build some good stuff but you had better be able to wait or have a builder to put the parts in cuz scheduling is a pain.

 

[gathomas]

cerberusiam



Do you actually have no first gear or you just can't get it to downshift at any time? From the sounds of it new transducer, gov solenoid, and output shaft speed sensor time.





No First gear, I'm starting out in 2nd gear, it doesn't matter if I'm in (D) Drive or manually put into 1st.



This is a Total rebuild "Goerand" trans... Valve body with solenoids, triple disc torque converter, billet input shaft, etc. . etc...

 

[Sled Dog]

Talked with Dave today, about 30 mins.

Its True its more difficult nowadays to get throught.

Many have discovered his product.

But be persistant as its WORTH it.

Was so impressed with my purchase of a 3D converter and valve body,

that I'm having them build me a "Complete Unit".

If QUALITY is Very Important to you then,

Dave IS "The MAN"

Check the website, prices are listed.


If there's ever a problem, you're dealing with the BOSS,

not some salesman at the local outlet.

 

[gathomas]

Hello, Sled Dog

Did you happen to read my Last Post. ??

 

[fox]

Ok, it is starting out in a higher gear. (2nd or 3rd ) This is limp home mode. Ussually caused by the vb not seeing zero or close to zero from the gov circuit.
Put a gauge on it and verify it.
You should see about 2 psi for each mph.

Sorry about the goof about 2nd gear. If the trans is working in 2nd, or 3rd, or 4th, the rear clutch is working. ( rear clutch is first gear. )

 

[cerberusiam]

Rear clutch pack is all forward gears. 1st gear in auto is a sprag clutch, manual 1st is the rear band applied.

I take it reverse is still working. If so, either the gov pressure is high and solenoid stuck or transducer messed up or the sprag is broke.

If you haven't done it, the GM style solenoid will cure a lot of the problems with the gov solenoid sticking and not setting right. Replace it and the transduser and go from there.

 

[gathomas]

Cerberusiam,

I called the Rebuilder's shop this AM and relayed the info you gave me in the prior posts.

Whether they'll consider that info, I cannot say... sometimes pride will get in the way of judgement, if you
know what I mean.

When I talked to them this AM, I was told they had been on the phone with "GOERAND" , who supplied all parts!!!!

I want you to know that I've read many of your posts, therefore I trust your knowledge base, and appreciate your input!!!

Thank you, Glen

 

[cerberusiam]

Yep, we are all guessing based on experience as we can't be there and put gauges on it and drive it. You will ultimately have to work with the shop to resolve the problem. All we can do is provide a little info for your benefit so you don't get blind sided.

I would suggest the GM style solenoid if oyu don't have it and a new transducer for starters and see how that works.

 

[gathomas]

Cerb,

Is that GM style solenoid a Borg Warner unit ? Chrysler part #56028196AD ??

 

[cerberusiam]

No, its not a Chrysler part. Its an aftermarket piece with a new gov houisng to make it work. Pic below. You can get it from differnet places, Suncost, PATC, etc.
The OE piece, and even the upgrade solenoid that fits the OE housing, has been problematic.

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