Tranny slams into reverse

[MaxPowerLB7]

I've got an issue with my tranny. When everything is cold it will shift into reverse just fine. When the tranny gets warm it will pause then slam into reverse. I have no other issues. I believe it has something to do with the pressure switch? Anybody got any ideas?

 

[Mike L.]

Stock trans or built?

 

[Josh2002cc]

Sc IV

 

[LB7Diesel]

I "THINK" Mike told me to reset C2 tap cell when mine did this. It quit for awile but has since returned.

 

[Mike L.]

You could try resetting the garage taps and see what happens. There might also be some crud on the reverse pressure filter screen on the manifold. Changing spin on might help. There is always the possibilty of worn C3 clutches.

 

[reuter]

i was having same issue, like you had to stand on the brake to keep her under control, took valvebody apart, had the lil conical internal plugged with material. I had also broken the little spring that holds the check ball in the lobe (part of Transgo kit). put her back together and returned truck to stock to let it relaearn (after a taps clearing via EFI) then go let her eat

 

[LB7Diesel]

You could try resetting the garage taps and see what happens. There might also be some crud on the reverse pressure filter screen on the manifold. Changing spin on might help. There is always the possibilty of worn C3 clutches.

Atleast i had the word "Tap" right!!


I shouldn't forget tapping it in a garage

 

[MaxPowerLB7]

i was having same issue, like you had to stand on the brake to keep her under control, took valvebody apart, had the lil conical internal plugged with material. I had also broken the little spring that holds the check ball in the lobe (part of Transgo kit). put her back together and returned truck to stock to let it relaearn (after a taps clearing via EFI) then go let her eat

Ya thats exactly what it acts like. I have reset the garage taps to no avail. I suppose i will change the spin on and see if that does anything. If not i will drop the valvebody and have a look around.

 

[BLUEBLAZER]

Mine does the same thing i have had the defuel off for about 3k miles and pulled a 20k pound back hoe like that, hope i didnt fry the thing, but it holds power just fine.

 

[kjp800]

I recently had the same thing happen to mine, however I would also get the same thing in the 2-3 shift. After I shut it down I restarted and got the "shift range inhibited" message and truck wouldn't go into any gear.

Any ideas?

 

[reuter]

what codes did it throw?

 

[kjp800]

No codes at all