Hell I can send you a GU type 2 housing, springs, new piston w/legs & a seal no charge. Just pm me your address. I have to take my wife to the Doctor tomorrow. But can get it in the mail Thursday.

 

that spring is for the 3-4 accumulator. The other spring you listed is for a stock LT1 b-body which originally had a type 2 housing. you bought the wrong parts for the new housing. full stop.

I guess the confusion is that type 2 ALWAYS had a single spring setup. i was incorrect they sometimes had an inner and outer spring, but these springs are not the same inner/outer as what was used in the type 3 housings.

 

The trainwreck that domestic auto parts are in general never ceases to amaze me. I've worked in european parts for 25 years now and they are about as **** and specific as you'd imagine with the exception of the British, and they are still easier
to sort out than Ford and GM stuff that's a few years old. It's like it's all a secret lol...

Virtually everywhere lists 24209794 as being for 1-2 (and most places say the 1-2 is the same spring as the 3-4), but I'm happy to take your word for it that it's not correct.
Sonnax also lists spring 74926 that I used as being a universal replacement but mine sure shifts like a bear with any kind of throttle. Could it be because I used JUST
that outer spring and not a center one? I don't know what version accumulator housing is in there now, trans was rebuilt awhile back.


Anyway, so type 3 housing, plastic piston, ordering springs 24220145 inner and 24219942 outer, both green, that will get me to a stock 1-2 shift if nothing else is worn out, right?

 

should be stock depending on what you've down with the 1-2 shift hole, PR valve, accumulator valve lineup,etc.

 

Nothing at all, trans was rebuilt by a local shop to presumably stock a good decade ago, I put in a rebuilt valve body to fix a tcc code when I started driving it regularly, that's it.
I've read the SS trans might have been slightly different than the grandma-spec caprices, cop car options maybe but I'm not positive.
Shifts okay other than the 1-2 and even that is okay at light throttle, seems to shift a little late at light throttle too but who knows.

 

Every Impala SS transmission I have seen had a corvette servo from the factory. It contained an additional conical spring inside the 2-3 accumulator portion of the servo

 

I believe all LT1 b-bodies got the vette servo. I just went through a '96 Buick RM wagon w/ LT1 and it had the vette servo. valve body is nothing special the only thing that would have been different is the 1-2 accumulator and maybe 3-4 accumulator springs.

 

Just for someone's future reference, a current 24219942 in a Genuine GM Parts baggy is not painted at all but listed as "green" everywhere. The inner
24220145 is painted green.