what rear end? and what is the revs at say 60 mph?
I'd have to wait til I see the truck again to answer with any accuracy. But the revs seemed to be getting up there(2500-3K? Its hard for me to say, I am more used to looking at the tach in my Ford... But I wanna say the needle was pointing about 1:30-2:00), and I was only going about 50mph if I recall correctly. I do know that even working properly it will take a little adjustment for me since my other truck is an OBS F350 crew cab on 42" tires, and it still has 4.10 gears... So my ears are used to a sound of just lugging along even at 70-75... The dodge is still running the stock size Michelin street tires(and its gonna stay that way LOL...)... I don't have a clue what gear is in it..
Hey Boost, I'm no trans expert but let me offer this up...I have a 95 ranger that was doing the same thing. Everything was working fine except for OD couldn't get it to engage. Prior to that I had my radiator replaced and the new radiator apparently came with a new trans cooler..somekind of aftermarket deal. <SNIP>
Yeah, I was wondering about that, since thats why I threw in the part about the radiator and temp sensor. I was going to expand on my thoughts but it was in the middle of the night when I posted and the baby wasnt feeling good so I was tryin to get done before he woke up the woman and gave me hell about being up on the computer.
But yeah, since there was little coolant circulating, maybe by the time I was on the hard road maybe the trans fluid was hot.. or if it uses coolant temp to decide, then maybe it thought the engine was still too cold. Either way, new radiator is being dropped off today and hopefully I will get it put in on Sunday after I get back.
OD off swith problem? (assuming it has one)
The OD button on the shifter is problematic on these things too??
Since it seems to shift O'K in lower gears, I doubt the governor pressure solenoid is bad.
first would be replace the speed sensor on left rear of tranny. It inhibits OD if no signal received. Cheaper to replace than try and diagnois. Park truck downhill or get a atf bath on removing.
Also check for codes relaying to OD circuit. This would hint the wiring is fubarred or OD and or LU solenoid is suspect. If no codes than a mechancial problem with solenoids may be indicated. Drop pan and lookee see for condition.
Codes are often the best way to diagnose the issue. The 47RE IS an electronically controlled transmission and each sensor speed/temp/APPS/ect have an affect on how it operates. The trans also has failsafes that include a "limp" mode which disables OD.
Ok, so I went to NAPA while up here in GA and bought the sensor. The guy asked me input sensor or output?? Do they have a sensor for the input shaft speed too? I ended up buying the "atp/output speed sensor".
Link to the sensor I got.
Does that look like the right one?
What does APPS mean?
I'm going to throw this out there. Not sure if its related or not, but although the cruise control lights up on the cluster when cruise is powered on, it won't actually take over. But I would assume cruise uses the diff speed sensor, and the speedo works so its prolly a different problem.
So heres my current plan for when I get home.
1) Change oil, and hopefully not find coolant in it.
2) Replace radiator.
3) Test drive truck, see if OD magically fixed it self with a properly operating cooling system. If OD works, replace ATF and filter. Have my buddies scanner handy to see what the computer is requesting the tranny to do.
4) If problem persists, jack the back end up and replace the speed sensor.(thanks for the tip about having the back end higher.. didnt see that in other threads!). Will also adjust the bands while Im there.
5) Road test. If it works, replace ATF and filter.
6) If it still doesn't work then I gotta drop the pan I guess? At that time I will also do the filter and stuff. In the plan I have the filter at the last point just because I dont want to drain and replace it only to have to drain it all again if the radiator and speed sensor doesn't work.
Im guessing if the ECU is telling the tranny to go into OD and its not(and its also not slipping, just not shifting anywhere), chances are its a solenoid issue?
Man, I cant wait to drive this thing! Its going to be so nice to have a diesel that I don't have to stretch my legs to my stomach to get into!