TC in a stock tuned truck locks at 36mph (with 4.10s) and shifts into OD under light throttle at that point...

 

When you turn the OD back on it will be a clean crisp shift. The TC lock will be the 3 rd shift you feel

 

This seems like what I might be feeling but with a hesitation.

 

That bump is really the only shift I feel firm with OD on.
At about 40.

There is a soft shift around 20.

Thing is the hesitation or bump only started about maybe 18 months ago.
Ive had it about 5 years and didnt feel it till then.

 

the "soft shift" is when the truck shifts into 2nd gear with the TC unlocked... then it should shift at about 25 if you keep a steady speed into 3rd with the TC unlocked and stay there until about 35-40mph when the TC locks and it shifts into OD

 

So what does it mean that I can feel this bump more now than when I first got the thing?

It never did this first few years I had it.

I feel the bump under gentle acceleraton, but if I need to punch it pulling into traffic it will really bump hard sometimes it never did this before.

 

maybe it means your trans is getting worn?? i'm not too sure on this since i don't even think i have shift flair

 

Thats the question.
Trans TC or both or something the cure could fix?

Ive been driving for about a year like this and other than the bump it doesnt feel like its slipping.
Fluid doest look or smell burnt.

 

Tried turning OD on and off on the way home from tonight.

With OD off it basically felt like the engine was working harder but no shifting feeling.

With it on I felt the shift points a little more and the engine was reving slower.
It was cold I actually didnt feel the bump at 40 I think it mostly happens when it is warm outside or the trans is warmed up especially after towing.

 

The cure will make the responce time of the TC quicker. (duration)
The VB will make the responce time of each shiftpoint quicker. (duration)

The TC duration is set by fluid passage in the trans. The only way to set it it to pull the trans and pump. As you enlarge the passage the shorter the duration. The cure shortens the TC duration electronically. (no need to pull the trans).

The Shift kit in the VB will allow you to change (tailor) each shift duration.

Any mods done to the truck change the input and output of the trans.
By any i mean ALL. Even a change of tire height loads the out side of trans more.

From what i have seen trans builder's will keep the duration of the 4th (OD)
On the long side (more slip). This will hide the slip of the TC at that point.

On a WAG you feel more slip a light throttle from the TPS calling for a lower EPC. The lower EPC increases shift duration acrossed the board. (added slip)

You want the shifts quick and firm and the TC quick and firm. Anything less is just wear on the clutch/clutch packs and shortens the trans life.

Fords design added slip so it would have a car like feel. But scarificed its life span by doing this.

Bill

 

so since i have done c00ns shift kit i dont need a valve body because thats just a shift kit 2 right

 

The correct term would not be VB but VB mods.
In otherwords anything that will shorten shift duration.

Fords answer to the TC/OD problem, was to slip the TC more.
The next gen of the E4OD is the 4R100.
In the 4R ford introduced PWM (TC). PWM has even more slip than the E4.
It has a much softer/slower apply of the TC. With the PWM you can adjust the slip for the merge with the OD . But this was a ars backward way of doing this. It added more heat and slip into the TC. Most tuners will rid the PWM and opt for the apply no apply of the TC.

Bill

 

Well it depends its not the same all the time been driving the last couple days and havent felt it at all.

When I do feel it it is at a steady throttle and a slight bump.

When I have been able to feel it there have been times Ive needed to get on it to accelerate faster then Ive felt a serious bump closer to a banging this is what is spooking me the most.

Is there anyway to tell what kind of shape the trans is in?
I don have a tach so I cant really watch it bounce for a slip.

 

The change in feel from light/heavy throttle comes from the EPC. Its low at light throttle causing more slip, as with the heavy throttle it has a higher EPC with less slip to the clutches. Most of the time the issue comes from the TC.
Its to slow to engauge.

Have you added any mods to the truck?
No tach needed. Is this an E-series?
If you filled your sig we would know year and model and mods.

Bill

 

It is a 96 E350 van. Ill get on the sig sometime soon.

Not really much in the way of mods.

Ive got rebuilt Beans injectors.
With the modded Injector driver module.
And a 4 position chip from Beans that I keep in stock program most of the time.

Ive been thinking I should change the fluid but had a trans shop check it last summer and the didnt feel anything strange. The recommended against changing the fluid if it was going bad that could speed it up.
I have had that happen to me before after changing fluid in another car.

Kinda not sure what to do Im not sure its even really going bad but Im haveing a tough time trusting because of a few other breakdowns with it. Not trans related.
Afraid to break down while towing my racecar trailor. 10,000lb trailor stuck on the side of a 2 lane road with no berm to pull over would not be a good thing.