5R55S Problems - Ford Mustang Forum
 
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post #1 of 6 (permalink) Old 10-08-2016 Thread Starter
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5R55S Problems

My transmission has been acting up first i stopped at a stop sign and as i proceed to go the car wont go at all only rev. I put it in park and back to drive still reved then to reverse and still wouldnt go.

I had to turn off the car put it in park and then to drive and it finally went like nothing happen. Second time i was driving between 50-60 km and the car just decided to start reving. I pulled over to the side and turned the car off and went on my way again. Does anyone have any idea whats going on?

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post #2 of 6 (permalink) Old 11-17-2016
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Sounds like problems with the low reverse servo engagement. The cause could be a variety of things including fluid level, solenoid pack, valve body gasket, servo, etc.

Interestingly enough, I have an update to this related issue:

Ford Mustang Forum - View Single Post - Transmission started to whine in 2nd gear?

After 60k miles on a new replacement transmission, my car started having problems getting into reverse, similar to yours.

I pulled the pan to start checking things out.

So far, I found that the low reverse servo housing was not assembled properly at the factory. The 2 halves of the housing are supposed to rotate together until it can click and lock in place. Mine wasn't locked, and the whole thing popped apart when I unbolted it.

Looks like it may have rotated over time until it came apart and made the servo operation a problem.

First time that I've heard of this cause. Most other ones are related to solenoid packs, dirty valve body, and eventually, burned and broken bands.

Don't keep driving with the problem. After a while, the reverse band breaks and will require a full tear down of the transmission to replace.

How many miles do you have on your car?


2007 Satin Silver V6 / Explorer Express X-Charger #67 - Xtreme 2.6 - INTERCOOLED!
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post #3 of 6 (permalink) Old 11-17-2016
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The problem at 50-60 kmph could be intermediate or overdrive servos disengaging and releasing the bands.

Considering the reverse issue, and the 50-60 kmph revving, I'd check the solenoid pack which controls the servos. They are known to go bad.

5r55s also are known for servo bore wear causing problems.

There's also a part in the transmission pump that controls oil flow/pressure that can cause problems.

And before all of those other things, check to make sure your fluid level is correct.
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post #4 of 6 (permalink) Old 05-10-2017 Thread Starter
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I really apologize for not replying I ended up buying a 5R55S with 20K kms out of a branded/not sellable mustang (long story) got it for 300$. My old 5R55S with was stored in my dads garage wrapped in a tarp over the winter.

When I removed the trans the top part of the bell housing had weird writing on it. Me and my dad thought it was bought at a salvage yard, until I started to disassemble it. It was actually rebuild.... The case has brass sleeves. I have got it about half disassembled so far. When I took out the first drum it's all rusted. I will post pictures soon
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post #5 of 6 (permalink) Old 05-10-2017
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Is it actually rusted, or is it discolored from a slipping band?

2007 Satin Silver V6 / Explorer Express X-Charger #67 - Xtreme 2.6 - INTERCOOLED!
AEM, MSD, JBA, Zabteck, FRPP X, Dynomax bullets, Pype Bombs, J&M, Steeda, Tokico d-spec, H&R Race, Eibach, Shelby Fays2, Shaftmasters, 8.8, t-lok, 3.73, OE Wheels Cobra R 18x9/10, Nitto 555 255/285, Hawk HPS, GT/CS F/R fascia
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post #6 of 6 (permalink) Old 05-15-2017 Thread Starter
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Quote:
Originally Posted by Mr. Ugly View Post
Is it actually rusted, or is it discolored from a slipping band?
it's rusted... I added the drum with the band that was with it.
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