Have your tuner look at it now that its been "fixed" again and see if it is going into lockip or not.... Alot less expensive than a scanner worth buying that will show you trans data....

 

It wouldn't lock up after the first rebuild, but I took it back to rapid motorsports and it seems like it's locking up and putting in all the gears firm.

 

The paper on the right is the first time I had rebuilt it with these guys then it began to slip. Then I left it again to get repaired and the paper on the left is for today. So the same thing is happening again.

 

You my friend need a valve body, take it back to them and tell them they need to update or replace the valve body and find the tsb gm has on the p0894/p1870 codes....

 

Tsb is the technical service bulletin right?

 

Yes, may be a PI (preliminary information) bulletin but either way its out there

 

Also another thing bugging me is the shift points on cruising speed. Like I said before 1-2 10mph 2-3 20mph and 3-4 30 mph. When I first had this truck it was 1-2 10mph 2-3 around 25 and 3-4 45. When I got it rebuilt the first time it shifted that was aswell for 3 days then it stopped shifting that way.

 

Shift points are a little low... Which is in the tables, under different tps% its going to **** at lower speeds....

 

Today I drove my dad's truck and that one shifts 1-2 around 10, 2-3 20, 3-4 around 30 but then it feels like another shift at 40 mph. That's how my truck felt but last shift at 45.

 

It sounds like **** poor tuning.

You should have 3 shifts. 1-2, 2-3, 3-4.

The "5th" shift is the converter locking up. Depending on how it's tuned, it could be a small "thump" or a large "thump".

For me, lockup is a large "thump", my rpm's drop significantly and it takes a fair amount of pedal to get it to unlock.

As for the shifts, that's all tuning. I use the Bluecat software and adjust the aggressiveness of how long the gear holds before a shift and how sensitive it is to downshift.

Where are you located?