Hi guys,

New to forum. Owning Lincoln Ls. I know that Jags have same trannies we speak about 2000 year models. 5R55N.
Been reading many threads on transmission problems.
Looking for some advice.

I am having P0735 error, which means 5th gear wrong ratio.
How bad can it be? If someone had similar trouble, would like to hear what you ended up with.

Thanks.

 

You may find it well worth using Search
Choose Posts (rather than Threads)
And the 2 things to try are:
P0735 (hey, what did you expect?)
Sonnax

Could be a pretty cheap fix.

 

jagv8,
hi, I've read all of these speaking about broken spring in valve body.
Solenoid pack replace, valve body itself. Many of these threads end up with tranny rebuild, tranny swap or car swap.

I took it to a tranny shop, while testing they said that 5th gear tends to slip but not all the time. Its like fine, then slips. Its not something constant.

I am thinking of some electrical issue, maybe bad contact on some tranny wires.
Maybe some water got inside.

 

Unfortunately, the DTC code we get only gives us a narrower list of causes, and with that information, do the best we (and any mechanic we hire) to fix it the rest of the way. This time, there's no one answer for a fix. May be time for a physical examination of the valve body...eliminate them one at a time.

 

I can't see it being wiring. Possible, perhaps, but unlikely. Looks like taking it apart is the next step.

 

Well the broken spring you mention is easy and cheap. Get the parts here. Scroll down and look for the 4-3 pre-stroke spring.

http://www.transmissioncenter.org/5r55s_mustang_v6.htm

You did see where it matches your DTC735? I think you might have an easy fix!
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very good link tbird

 

He dismissed that "spring" stuff when I posted it.

I dunno why. Just seems soooo likely to be it.

 

Yea I saw that. I don't know why people get a likely answer but won't do anything except more posting on the internet. Sometimes you just have to go out in the garage get the car up in the air and actually work on it.
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So true!

 

Does the tranny have a provision to measure input and output shaft speed in relation to real axle speed? In otherwords, could the problem be a faulty input or output shaft sensor? These sensors are located at the front and rear of tranny.

 

The tranny doesn't, as on the Ford box it has no computer. It's done by the main PCM (which does engine+tranny). It has at least 3 tranny speed sensors, judging by the circuit diagrams.

Whether it can/does check the "real axle speed"... er, what is that? LOL

Er, all very interesting but it's still gonna need taking apart I feel. Not least because a tranny shop will probably understand the box but NOT jag's PCM (and won't need to). A jag place will not understand the tranny (or the PCM - ahem!).

 

jagv8, on vehicles with input and output shaft sensors; they work as inductive pickups i.e. sending inductive pulses to the ECU which in turn calculates input vs output shaft revolutions in relation to drive shaft (and ring in differential for that matter) revolutions. Many manufactures used to or continue to use this method to measure rear axle revolutions in relation to input shaft revolutions as a means to calculate gear changes, converter lock-up, and ABS kick in-off. This is how it was done on my 99 Dodge Durango (sold).

 

Er, yeah, I said as much. The S-Type with Ford box is as I described. Just didn't know what you meant by your terminology. I'm used to them being called ISS and OSS (input and output shaft speeds). I thought you meant yet another axle and was puzzled quite which / where.

They're shown very nicely on the circuit diagrams.

Pretty sure there are no sensors in the diff.

It's still probably not gonna help the OP