I had a 2-4 billet servo installed into my 2004 C5 automatic. My local Corvette shop in San Diego said he does it all the time and I'd like how the trans shifts. Now my transmission case is broken and my 17K mile transmission is smoked. The case broke around the snap ring that holds the servo cap in place. He claims he can weld the case. Not sure why the trans smoked though. Anyone else ever had this problem?

 

Broken snap ring grooves for the 2-4 servo is caused by having the ends of the snap ring too close to the open area of the groove in the trans case.

Always install the open end of the snap ring in the 9-12 o'clock position.

Russ Kemp

 

Thanks Russ. I'll pass that along when I get my new transmission case! What a mess........

 

I wouldn't let anybody mess with my transmission other than RPM. Our transmissions are a little more complicated than the old school trans'.

 

Seen too many local shops do rebuilds that grenaded in less than a year.

 

I too would talk with RPM Transmissions. If I were going to do it, I'd sure want it done right the first time.

 

I'm really in a spot. The transmission is something I can't fix myself. I don't like anyone touching my cars but I have no choice. It makes me crazy to think that an 04 with 17K miles needs a new transmission. I bought the car last year with 1800 miles and I've been told that's the reason why I've had troubles. Bunk.....

 

Bulletin No.: 04-07-30-025A

Date: July 27, 2004

TECHNICAL

Subject:
Transmission Fluid Leak, Inoperative 2nd/3rd/4th Gears, No Movement, Case Cracked or Broken at 2-4 Servo (Repair Transmission and Install New Retaining Ring)

Models:
2004 Chevrolet Corvette
2004 Pontiac GTO
2004 Light Duty Trucks

with 4L60-E and 4L65-E Automatic Transmission (RPOs M30 or M32)

Supercede:

This bulletin is being revised to add the Corvette and GTO models and to include the 4L65-E transmission. Please discard Corporate Bulletin Number 04-07-30-025 (Section 07 - Transmission/Transaxle).

Condition

Some customers may comment on a transmission leak, inoperative 2nd/4th gear, slipping 3rd/4th gear or no movement due to excess fluid loss.

Cause

This condition normally occurs at low mileage, usually under 1,600 km (1,000 mi), and investigation may show that the servo cover is loose or that the transmission case is cracked or broken at the servo bore.

This condition may be caused by a servo cover retaining ring that did not retain the servo cover.

The servo retaining ring design was changed for the 2004 MY from round wire to wire with two flat faces.

In mid-April, 2004, the retaining ring design did revert back to a round design in production.

It is possible that the transmission case may crack at the servo cover area due to the retaining ring being incorrectly seated.

Correction

Important: ^ In mid-April, 2004, the retaining ring design did revert back to a round design in production.

^ If the transmission fluid level has lowered due to loss of fluid, it is possible that damaged 3/4 clutches will result.

^ A cracked or broken case may usually be repaired at a significantly lower cost than transmission assembly replacement by replacing the case and any damaged clutches or bands.

1. Raise and suitably support the vehicle.

2. Inspect the transmission case around the servo cover for signs of cracks or damage to the case.

^ If the transmission case is cracked or damaged, replace the transmission case. Refer to the appropriate SI Document for Transmission Case Replacement.


© 2010 ALLDATA LLC. All rights reserved.

 

Wow. Thanks Kevin. Looks like I'm not the only one with trouble. I thought I was alone! lol......

 

I have 20k on the engine and I lost 3rd gear.
My solution--Rpm makes a good tranny. And so does FLT
I have heard alot of good things about them and so I went
with Finish Line Trans.
You better consider a brand new stock unit or a built one.