winnebago chieftan

[moty]

my winnie will only go into 4th gear when hot it will go 1st 2nd 3rd with no problem can anyone help please oil levels right the right oils in it just wont go into 4th when cold

also my cruise controll has gone off

[Nick-B]

Hi moty and

It would help if you mentioned which chassis your Chieftain has. Ford or Chevy if gas powered and which if diesel (did they make a diesel Chieftain? I don't know).

[moty]

its desiel 6.2 turbo and chevy chasis

[Dixieray53]

Post the year of the RV and transmission brand..It might help get answers..
Welcome to the forum...D

[Nick-B]

Quote:

Originally Posted by moty its desiel 6.2 turbo and chevy chasis

Now I'm confused.

I didn't know that they used the 700R4 overdrive trans behind the 6.2 motorhome chassis. I know they did in the Chevy pickups and Suburbans, but the higher weight motorhome chassis supposedly only got the 3-speed Turbo 400. I've been wrong about many other things though.

If you don't know for sure which transmission you have, crawl under and look at the transmission oil pan. The 700R4 is pretty much square and the Turbo 400 is like a race track. Here are the GM tranny pans.



Assuming you do have the 700R4, it is unusual that it will only go into overdrive (4th) when it is hot. Usually, OD either works or it doesn't. There is no power used to engage OD but there is voltage used to engage the torque converter lockup. I wonder if it is not locking the converter, which feels like a slight shift, and it isn't an OD problem at all.
Still odd about it working when hot.

[moty]

its an 1993 and electronic gear box... on the chart my oil pan is number 7

[Nick-B]

Thanks moty. That helps us narrow down things.

The good news is you have the heavy-duty overdrive automatic. It is much better than the 700R4. Also, are you sure you have the 6.2 and not the 6.5. The 6.2 was not in production by 1993. Not an issue, just wondering.

OK - on with the problem. No OD when cold. This is NORMAL. Engine temp must be above 140 degrees F before the computer will allow overdrive. If you think it is still taking too long to get there you could have a faulty temp sensor or thermostat. Unfortunately, I do not which or where your temp sensor (there could be more than one) is located. You'll need someone more experienced with your particular setup to further diagnose.

Best of luck.