It looks like you have mixed up your pins. That pin looks like it is from the 1-2 accumulator (the housing that sits directly on the other side of the separator plate). Try swapping the pin out of your 1-2 accumulator and using it in the case. This thing:

 

You mixed up the 2nd and 4th accum. pistons! Check the hole in the center, the 1-2 is smaller

 

Doh, gonna go check.

 

that was it.. the pins were right (fit snug) but once I swapped the pistons everything moves like it's supposed to...

see 2 attachments. I think the instructions with the Transgo kit are unclear.

I think I have it now.. thanks!

 

piston swap images uploaded

 

next time.........use sonnax pinless pistons

 

Several hundred builds here and never a pinless acc. in any of them.....whole lotta boost valves, sleeved drums and clutch-packs, servos and bands. I think I own stock in raybestos, but the 4th accumulator always ends up in the garbage can under the tranny bench. I'm sure GM meant to plug that feed hole with a checkball anyway

 

Hey, problem solved. Happy motoring!

 

All back together, and I just put another 10-15 miles on it at various speeds. Seems better, but either something is still wrong or I just need to get used to what the shift kit did. It seems to still spike the RPMs more than I would expect when it shifts into 4th. I might take a video of the tach tomorrow and maybe host it somewhere and see what y'all think.

 

Only in 4th? Did u replace the servo w/ aftermarket or use the parts in the trans-go kit? Did u flip the 4th apply piston in the servo cover? What about the seals? Get busy b4 u burn the band

 

I reinstalled it as shown here: https://ls1tech.com/forums/attachmen...ons-img005.jpg

Only used the Transgo HD2 parts, did not replace any servos.

 

Well it is still jacked up. Here's a video from my phone watching the speed and rpm's. I guess I'm going to have to find a shop to work on it. Maybe a good time to just bite the bullet and get an upgrade.

http://www.youtube.com/watch?v=DnBYamEn2Yo

Sorry the video is sideways, not sure how to easily rotate it. don't hurt your neck.

 

Oh and after limping it home like that, my garage smells bad, now too. Not a good sign, I know.

 

what size holes did you drill in the plate? was there excessive wear in the plate from the checkballs? if you did not check it i am SURE the plate was worn..........f bods already have the vette servo.....but did you install the shims?

 

The separator plate was the original one, about 80,000 miles on it. I did not notice any particular wear on it. I do not touch the servo at all.

Based on the video and what I've described, what kind of damage am I looking at?

 

All I see is a transmission with no 3-4 lockup judging by the vid. My experience is with 700r4s. When that happens to a 700r4 it's usually the governor or the lockup solenoid.


Being a 4L60e, yours is electronically controlled. Are you sure you connected the wiring harness properly?

 

There's really just 6 connectors, and I was pretty careful. Would it be worth replacing the solenoids, and maybe the separator plate? Could driving it like the video showed have damaged anything else, remembering the smell that filled the garage when I got it home?

 

At this point, it's hard to tell. Throwing parts at it without testing them first isn't likely to solve anything (test the solenoids with a circuit tester). I installed the Transgo separator plate in mine because the old one was worn. The accumulator spring had almost worn through the stock plate, check ***** had beat dents into it too, at 93,000mi. The clutches were fine though, even the 3-4 were fine which surprised me because I found all kinds of grey matter in the bottom of the fluid pan.

So don't panic yet. Above the Valve body the 4L60e is similar to the 700. My ATSG manuals says this about "3-4 shift/slipping or rough 3-4 shift". The following may apply to you, read carefully:

Governor---Governor valve stuck. (not likely unless you installed the wiring wrong)

Oil pump Assembly---(not likely your problem since you didn't touch the pump)

Valve Body Assembly---Valves stuck (2-3 shift valve train); or, Accumulator valve; or, Throttle valve; or, TV limit valve; or, 1-2 shift valve train; or 3-2 Control valve; or, Manual valve link bent or damaged; or, Spacer plate or gaskets incorrect, mispositioned or damaged.

Case ---3rd accumulator retainer and ball assembly leaking; or, Porosity in 3-4 accumulator piston bore; or, 3-4 accumulator piston seal or seal grooves damaged; or, Plugged or missing orifice cup plug; restricted oil passage. (you had trouble assembling the 3-4 accumulator, but presumably you fixed that problem, is there anything you might have done wrong?).

Test the solenoids, then take the trans off and go through it to check for damage. This is likely being caused by a simple error.


You can call the Transgo tech line and talk to them about it. They're pretty good. But if you've already burned up the 3-4 clutches for whatever reason you may need to change that clutch pack.

 

if your tranny was on the way out............there is nothing the TG kit would have done for you..........ask me how i know

 

Hello boss man,


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