Clutch pack too tight, which is pretty normal as most builders don't know any better. Then there's the old servo/band/wtf thing.

 

How many clutchs are in the pack? What is the clearance as it sits now? Can you post a picture of the damage?


Hutch

 

Sorry I did not take pics, but there is bluing on some steels only ,,not all and the amount is not a real lot ,,say no more than 10% on the worst one...

What should the clearance be please?

 

Need answers to all my questions to give you a good answer. Also do you know what the system line pressure is?


Hutch

 

Ok thanks guys, there are 7 clutches in the pack of the failed trans, and I think that you are both onto it,,, I contacted coan in regards to my other transmission one that they built, and They gave me a clearance value of 0.080'' for their 8 pack clutch... So, as these two transmissions are near identical I am thinking of converting my failed 7 pack to the same as my good 8 pack Coan transmission (COA-11128A-180-REID1). and set the clearance at 0.080" as it is the good trans... Sound Good? I cannot give at this point a clearance value for the failed trans at this point, I will have to see if I can obtain that info.. But suffice to say that it was a lot less than the coan trans, in which the clutch pack was still in immaculate condition... I will also have to ask in regards to system line pressure ,,, what should I be expecting to see please?
Mr hipster,,Then there's the old servo/band/wtf thing.<< what are you meaning regarding this comment please?
Thanks for the help guys

 

Well there are many reasons to lose a clutch pack other than capacity (clutch count)


Hutch

 

I'd run that pack @ .100/.110, real Sonnax servo, probably be in good shape. Glide likes .015 per clutch, believe me.

 

Once I installed the Sonnax kit my band problems went away.

 

Once I installed the Sonnax kit my band problems went away.

View attachment 52652

This is what I put in mine when I re-built it. Excellent piece.

At your HP level you do not need more than 5 clutches in high gear. My car is 3140 lbs and runs 10.0. My glide has 5 high gear clutches and 2 reverse. It is very reliable.

I built mine with only 5 clutches and it I run 8.70's @3130lbs. I have 16 passes on it and so far so good. 1.23 60'

 

Sonnax number
28821-20K

 

I love it when a product actually does what it is marketed to do. This does. I would recommend it to anyone, regardless of the power level. Really cleaned up my shift.

 

At your HP level you do not need more than 5 clutches in high gear. My car is 3140 lbs and runs 10.0. My glide has 5 high gear clutches and 2 reverse. It is very reliable.

 

Thank you all for your input,,, I have spoken with the trans man.. It has become very clear that this trans has been set up with insufficient clearance. The line pressure I have not checked, and I have never done this but from what I see it is checked at the servo cover, Is that all? or are there other checking ports? with some of the research I have been doing seems the sonnax servo works better than most and if this + proper clearance is the solution I would be delighted

 

with some of the research I have been doing seems the sonnax servo works better than most

Not that it works better than most, it is the only one that fixes anything. Do yourself a favour and watch the Sonnax pin bias video.


Hutch

 

ok, will do sonax pin bias video - Bing video

 

to add to this when the trans was disassembled, the band showed no visible signs of distress, only the clutches... this of course is not to say that there could be a problem in that area also

 

I must confess, I know nothing about these transmissions.. The guy helping me here is a pro trans man, but not on these type trans'. He has suggested some possible valve body issue but I did and do not understand how this can be... Any input there please?

 

You do realize in this thread you have been talking to the best of the best trans guys out there? These guys know the performance/race transmissions like the back of their hand. Listen to them.

 

UPDATE ,,, got this thing back together, the second trans that is.... Reid case, and it has an allen head plug id about the middle of the case and this has no pressure showing on the gauge... The car has both forward gears and reverse, while on jack stands.. am I doing something wrong?

 

Pic of this mid way on the case plug your talking about.

There's a servo port and reverse port and that's it.

If you have found another please let me see it.


Hutch

 

https://i.ebayimg.com/images/i/331351826897-0-1/s-l1000.jpg

hoping for the pic to appear,,,, about in line with the front and rear shafts,, and about 1'' forward of the rear housing is a 1/8'' npt plug,,,

 

That is the reverse clutch pressure port. You will only see pressure there with the transbrake applied or in reverse.


Hutch

 

OK thank you, for that

 

Desoto, the plug is on the servo cover. Look at the Sonnax illustration you will see a dark spot, that's where the plug should be check pressure at that plug.
Tommy

 

Thx Tommy, I will move the fittings to that port and report back..

 

Ran it in that port and got ~90lbs.

 

I am ready to test this trans for pressures,,, What is it that I should expect to see and what procedure should I use for testing please?

 

https://www.youtube.com/results?search_query=powerglide+pressure+test

Don't get out much do you?

 

no, what makes you think that?

 

Ok, in the forward gears the pressure is around the 200 mark