5R55N Tranny problems.....help!!

[stype2001]

I was reading on this forum  that:"If you are experiencing missing 4th and
5th gear and after reading the computer 734 and/or 735, and solenoid C
codes - the problem is due 4-3 pre-stroke valve spring on 5R55N
transmission. This spring can be replaced without fully removing the
transmission. Please contact us for more details and how to order."

On my bill from the dealer it is written: CODE P0795, PRESSURE CONTROL
SOLENOID C, PP0734 and P0735, INTERNAL FAILURE.

Can someone tell me if my transmission can be saved by a spring replacement?

Thanks for your knowledge

[Neil]

Thanks for asking and I am sure we can help you out.

What problems did you experience when your transmission failed ? Was it a missing 3 or 4th gear? Something like transmission slipping and then Transmission Failure light switching on?

If you switch off the engine and start again, can you drive the car if you set your J gate gear into position 2 or/or position 3 ? Can you accelerate up to around 45 miles in #2 and #3 J-gate position without transmission slipping, jerking and without transmission failure light alert in the panel?

[Neil]

Sorry, in J-gate #2 position max 25...30 miles no faster!

[Neil]

if J-gate #2 or #3 position doesn't switch on Transmission failure alert, does #4 position fails the transmission if you accelerate around 40...45 miles per h. ?

[stype2001]

I felt the transmission slipping for a few days before the failure alert went on, if I drive under 60Km/h, only the transmission failure light stays on If i go behond that speed, the on-board cpu indicate a problem with the gear box.

I will try to drive the car with the J gate tomorrow and I will let you know how that went.

Thanks again for your help

[stype2001]

I tried the J gate, and in position 2 and 3 I can feel the gear shift, I brought the car up to 50 miles and shifted to 4 but never felt the gear shift it feels like it stays in 3rd.  The transmission light is always on but the cpu does not indicate anything but the mileage.  But when I drove the car in normal (non-J-gate) mode when I go over 50 miles, the cpu indicates gear box problem.

What's the diagnosis doc?

[Neil]

Sorry to hear, but you should be somewhat lucky - this is not expensive to fix.
Anyway, this is a 4-3 pre-stroke spring that is causing the problem, I guess.
Of course I could not give you 100% that it's the problem, but you should try it

1.) call makco distribution (972-463-6175 .. Fax 972-463-6730 )
2.) order 5r55n spring (S46741G-3)
3.) order 5r55n filter (46010)
4.) optional, order 5r55n pan gasket (46300W)

the total would be less than $50 and plus shipping. Cheap eh?

Wait for the parts and go to the transmission shop. before, you may want to check out if the local tranny shop has the Mercon V fluid, if not, read our page about mercon V oil http://www.jagplanet.com/oil/mercon-V.php and what to order. You will need around 9.5 US Quarts (if they are able to flush it fully).

Remember, this spring can be easily replaced without removing transmission. Drain the oil, remove the pan, remove the filter, remove 4-3 prestroke valve, then spring, replace spring, install pre-stroke valve, install filter, install new gasket, install pan. Fill with fluid. Check for correct level as filling 5r55n is a bit different comparing to older transmissions.

Many transmission shops prefer to remove transmission for rebuilding, later finding out it's just a problem with $6 spring but they will never tell you that. Now what, I just saved you a couple of grand. Cheers!

[stype2001]

Thanks a lot for your help, I am thinking of going to the transmission shop and asking them to check it out before I order the parts from Makco (bulkpart.com).  Thank you also for the tranny oil advice. 

One last question, If the spring replacement is the solution to my problem how many hours of work can I expect my mechanic to charge me?

[Neil]

I am not that technical myself, but it depends how fast they can lift the car, remove transmission pan.. it also depends if they will be able to remove pre-stroke valve and spring (and remove all small metalic parts of the spring if it's broken) without removing the valve body where it's installed... 3...4 hours, I guess ?

Make sure they install correct oil (WSS-M2C 202B).

Make sure they know how to correctly fill the transmission as correct oil level is CRITICAL.

[mario]

Ok guys I just had my gearbox fitted with a new 4-3 pre stroke valve spring and used a great mechanic called Chris, he charged me £250 including parts, spring, oil filter, gasket, and oil, great value for a dirty horrible job that I would hate to do myself, his garage is close to Manchester city center UK so you could drop your car off before work and collect 3-4 hrs later, he showed me the old spring which was broken up into 4 bits and I was amazed how such a little thing could have caused me so much anguish, anyway if anyone wants to take the same road as me and get someone else to do this job then give Chris or sally his wife a call and just say Mario with the S-Type told you to call, he’ll know exactly what you want repairing that way, anyway his address is: 77 Cornbrook St, off Chorlton Rd, Manchester M16 7QB, tel: 0161-226-7400, www.car-mot.co.uk