I just installed the following parts:

Transgo Shift Kit
Pinless forward accumulator piston
GM aluminum accumulator pistons
Servo release check valve
Yank TT3000

Drove the truck last night and it feels like it has no power in 1st gear. Once it shifts to second, everything feels fine. From looking at the EFI Live log, it looks like the RPM's go up some then flatten out and then go up again. It just takes alot longer to get up to the shift point. Anybody have any ideas?

 

I'm by no means an expert, but it sounds like one of two things:

1) You are experiencing the 'looseness' of the Yank vs. the stock TC, or

2) You did something incorrectly in your installation of the TransGo kit.

I can't pin it down finer than that, tho. HTH.

 

Sounds like it is acting correctly. It's the loose feeling you are experiecing. Punch it in 1st if it hauls ***, its fine.

 

Did you re-tune the computer for the transgo, servo, and shift kit. Could be the torque management playing hell with your truck.

 

From looking at my log files, it took about 8 seconds before it shifted into second gear. With the stock parts it used to take about 2.25 seconds before it would shift into second. It's definitely not just the converter -- It just acts like it doesn't have any power until second gear.

 

P.M. teamtripp, he builds them for a living. He will point you in the right direction.

 

I also have everything on your list and it has never had that problem.....sorry I'm of no other help

 

I had this same exact problem. It felt like the parking brake was on in first gear but was fine once it got out of first. My problem ended up being the aluminum piston I put in for the plastic one in the accumulator housing. The aluminum one had the oversize pin hole whereas the plastic one has a smaller pin hole. I got a gm aluminum corvette one and it had the correct pin hole size gm part #2420-4496
Is the pic of the one in the thread the one you got? https://ls1tech.com/forums/showthrea...mulator+piston

 

That is the same accumulator piston I put in. Now it seems like first gear is fine about 50% of the time, but now it will not shift into second gear.

 

My trans acted sort of funny for the first 200 miles or so, someone mensioned it may be 'junk' being flushed out of the valve body.....