Servo questions

[KendallF]

I'm putting together the last pieces of the trans for my GN. I need some tips on the best way to use a stock GN servo and what to do with the (edit) 1-2 accumulator. This is a stock GN servo with the big spring removed and the scarf cut seal removed from the servo spring retainer.

I'm trying to get the servo snap ring in place and I can't get that thing in for the life of me. Anybody have a trick that works without the special tool to compress the thing? Also, is my difficulty in getting it in a good indicator that I should be using the next shorter apply pin? I've got a couple of 2 grooves and a 3 groove, but no 1 groove ones..currently trying the 2 groove for starters.

Next, the (edit) 1-2 accumulator. Use a stiffer spring (like the one removed from the servo?) Leave it alone?

Any help is appreciated..I am so not a transmission guy!

Edit: fixed my accumulator reference to the correct accumulator..doh

 

[78oldscutlass]

I was told that to select the right band pin, you have to take a measurement. Assemble the servo into the tranny. Install the retaining snap ring. Using a dial indicator, measure the servo cover travel by pushing on the cover as hard as you can.

I was told you want this around .060-.080" clearence.

To see if the band is to tight, slip a spare yoke on the output shaft and see if can be turned both ways. If not, the band is too tight and will burn.

since you said you have spare apply pins, try grinding down the end of the pin and see if it will slide in further. That way you find out if you need the shorter pin.

Oh, I found it easier to put the servo in when the tranny is in the car. YOu can get a pry bar between the floor and the cover and shove it in.

 

[HOTTOGO]

Assuming you've got it assembled right http://www.actperformance.com/catalog/actcatalog77.html
you should be able to take a hammer handle and tap it in to seat it, if not then somethig is a miss. Like 78oldscutlass said, when assembled you should still be able to turn the output shaft in both directions w/a little resistance in clockwise (make sure it's in neutral!)

 

[KendallF]

Originally posted by HOTTOGO
Assuming you've got it assembled right http://www.actperformance.com/catalog/actcatalog77.html
you should be able to take a hammer handle and tap it in to seat it, if not then somethig is a miss. Like 78oldscutlass said, when assembled you should still be able to turn the output shaft in both directions w/a little resistance in clockwise (make sure it's in neutral!)

I have the ATSG manual. The servo is assembled correctly. I can seat the servo with light taps.. if I were able to get the snap ring seated, I would check the rotating assembly; haven't gotten there yet.

Thanks to some advice from Lonnie Diers I remembered what we had planned to do with it in the first place..plug the feed in the inner servo piston, leave the return spring out, and assemble. I will try that next.

I am thinking about building a version of the tool shown in the manual so I can install the servo and check the apply pin adjustment properly.

 

[chris718]

why on earth would you remove the cushion spring from the band?when this is done every time the vbody backshifts w/ no tv itll kick .as 4 the servo all you need to do is grind off the pin till its good .yes this is an accepted practice in case you are afraid .seems like all the shifting quality tricks that are going around is bang boom is better ,and i am sick and tired of seeing it passed to unsuspecting enthusiasts who accept it as normal because no one has taken the time to make em shift right by retaining accumulators and not sky jacking the pressure.we have though. our transmissions shift right at all throttle angles and dont bang when no torque transfer is needed during non balls to the wall usage .they do however bark like a dog when a mustang comes along and we open the throttle body up.call me and ill send you a free hi rate 1/2 accumulator spring only available here that just plainly and simply does the job rite . im not baggin you bro just trying to show you how to spend more time in the drivers seat instead of under the hood beatin a dead horse.NOTHING works better than a properly calibrated automatic .say no to parts breaking shifts and start realkly enjoying your car www.ckperformance.com 718 626 4315

 

[KendallF]

I just love how you can get 3 transmission guys in one room and end up with 4 opinions! Chris, I have read some of your posts here and it sounds like you're thinking and have some good ideas.

I care less about a cushy shift than I do about making the band and direct clutches live. I have burned up friction materials in several generic stock rebuilds done locally. I have done one trans with a billet servo and a number of parts (including the direct clutches, etc.) set up by Bruce...it lived and I didn't mind the shifts.

This trans also has a good bit of the setup done by me with Bruce directing while I was in Sacramento last year; I took a suitcase full of trans parts along. You should've seen the security people when they asked to inspect my suitcase..mysterious machined round metal parts.

At any rate, I may give you a call and talk; I am sure you could teach me something..if I'm teachable.

 

[chris718]

we are all teachable including me .