[travioso77]

I just got this 97 PSD DRW AT with only 104k miles. As far as I know it is bone stock. It does not have a 5th wheel or gooseneck so I assume that it has not been used for heavy hauling much. Driving it around for the first time last night and I noticed at WOT, in first gear, the rpms raise normally as you go through first then the rpms stop raising and remain constant at 3,xxx rpm for maybe 2 sec. Then you can just barely hear/feel the transmission touch on 2nd gear and then immediately into 3rd. It almost skips second gear altogether. Normal driving it shifts fine into 2nd gear and everything else seems normal. I have not towed yet.
I would like to understand :
1) Why it basically skips 2nd gear and why only at WOT
2) Why it seems to hesitate (RPMs stop raising) just before shifting into 2nd gear at WOT.
I have not had the time to check anything out yet on the truck.
Thanks for any and all insight!!!!! /ubbthreads/images/graemlins/smile.gif

 

[jsduke33]

Are you sure it is starting in 1st, not 2nd?

Sometimes the accumulator valve body can get sticky and cause delayed shifts- possibly you have the transmission shifting into 2nd immediately followed by TC lockup then 3rd?

It would be a good idea to take off from a dead start and use as little right foot as possible and note the speed at each shift and count the shifts. Post them here and someone will let you know if they are correct.

 

[Richter69]

take off in m1 and shift to m2 under wot and see what happens. If 2nd works that way then the intermediate clutch is smoked.

 

[travioso77]

[ QUOTE ]
Are you sure it is starting in 1st, not 2nd?

Sometimes the accumulator valve body can get sticky and cause delayed shifts- possibly you have the transmission shifting into 2nd immediately followed by TC lockup then 3rd?

It would be a good idea to take off from a dead start and use as little right foot as possible and note the speed at each shift and count the shifts. Post them here and someone will let you know if they are correct.

[/ QUOTE ]

Now I am just confused and feel rediculous asking this question but is an E4OD a 4 speed transmission with overdrive(the equivalent of a 5 speed)? Or is it equivalent of a 4 speed. Here are my gear speeds:

Very Light Throttle:
0-11: 1st
11-17: 2nd
17-30: 3rd
30-35: 4th
35~ OD

Wide Open Throttle:
0-23: 1st
23-40: 2nd
40-65: 3rd
65+ : OD

What is wrong with this picture? /ubbthreads/images/graemlins/shrug.gif I have always had manual trucks before so that is my excuse for not knowing how many gears there are. Thanks for the help!

 

[BKB]

What you feel is the torque converter lock up after a shift. I have a van computer so my truck might shift differently. With my truck light throttle will shift to second then the TC locks up a little later, same with 3rd. At WOT it will shift into 2nd with the TC locked dropping the RPMs alot, same with 3rd.

 

[travioso77]

[ QUOTE ]
What you feel is the torque converter lock up after a shift. I have a van computer so my truck might shift differently. With my truck light throttle will shift to second then the TC locks up a little later, same with 3rd. At WOT it will shift into 2nd with the TC locked dropping the RPMs alot, same with 3rd.

[/ QUOTE ]

So the shifting scheme of a E4OD is 1,2,3,OD? NOT 1,2,3,4,OD. Right? I did notice after manually shifting at WOT that what I thought was the trans just barely touching on second and then straight into 3rd was actually it shifting into second and then locking into second. Someone please clarify the shifting scheme for me.
Thanks!! /ubbthreads/images/graemlins/biggrin.gif

 

[mikel]

The shift pattern on this tranny is different depending on throttle. It can be:

Heavy Throttle
1st
then
2nd
then
Torque converter lockup in 2nd
then
converter unlock and shift to 3rd
then
converter lock in 3rd
then
4th with converter locked


Otherwise it will shift:

1st
then
2nd
then
3rd
then
converter lockup in 3rd
then
4th with converter locked


I think you are feeling the converter unlocking in 2nd and then the shift to 3rd which doesn't change the RPM of the motor much and then you will get the 3rd lockup and you'll feel that.

The transmission gets annoyingly busy when you have the throttle all the way down.

Most of the time when the torque converter locks it will feel like a gear shift even though it isn't.

Mike

 

[mikel]

[ QUOTE ]
...snip...

Very Light Throttle:
0-11: 1st
11-17: 2nd
17-30: 3rd
30-35: 4th
35~ OD



[/ QUOTE ]

This is what I'm trying to explain, what is really going on is:

Very Light Throttle
0-11: 1st
11-17: 2nd
17-30: 3rd
30-35: <font color="red">TC lockup in 3rd</font>
35~ 4th

Mike

 

[travioso77]

[ QUOTE ]
[ QUOTE ]
...snip...

Very Light Throttle:
0-11: 1st
11-17: 2nd
17-30: 3rd
30-35: 4th
35~ OD



[/ QUOTE ]

This is what I'm trying to explain, what is really going on is:

Very Light Throttle
0-11: 1st
11-17: 2nd
17-30: 3rd
30-35: <font color="red">TC lockup in 3rd</font>
35~ 4th

Mike

[/ QUOTE ]


Yep, sounds about right...So my trans is fine...thats good!!
Thanks!!!!! /ubbthreads/images/graemlins/biggrin.gif /ubbthreads/images/graemlins/biggrin.gif

 

[Racer_X]

[ QUOTE ]


Yep, sounds about right...So my trans is fine...thats good!!
Thanks!!!!! /ubbthreads/images/graemlins/biggrin.gif /ubbthreads/images/graemlins/biggrin.gif

[/ QUOTE ]

Try the M1 M2 manual shifts Richter posted if you have a hesistation before the shift into third. Doing that will test the 1 and 2 clutches without an upshift until you move the lever. That will tell you if all is fine in those clutches.

You have a 4 speed automatic with a locking torque converter. The number of automatic upshifts is 3 and that is what counts. 1 to 2, 2 to 3, and 3 to 4. They count as shifts because they happen at differant road speeds automatically. What speed they occur varies with operating conditions.
The TC lock can feel like a shift, especially with a shift kit. What happens is the engine and transmission are locked and turning at a 1 to 1 ratio at the input shaft. It's not counted as a shift,but rpm drops @ 1 to 1 ratio. It drops because the lock up has now improved the efficency of the torque converter. It's now the same as your old trucks clutch was--locked to the flywheel and turning at engine speed. Except you don't have to shake hands with a ball, and move your left leg up and down many times a day to get the same thing. Welcome to TDS /ubbthreads/images/graemlins/smile.gif.
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