Paxun

What do you guys think of this separator plate; replace or not to replace? Found a new on for $27 shipped. Given what is going on inside this trans I am not even sure the plate or anyhting else for that matter is correct for the trans (1990 "CJM"). The valve body is dated correct "J109" for a '90 though.VIN on side of trans is CL1129919. Converted for use in F-Body (3G).





Also, I cannot recall which of these pistons goes inside the case and which goes inside the accumulator body. Any ideas; does it matter?


Somehow this orange spring was bagged with the servo, but I am not certain this is for the servo. From the resources I am looking at, the spring appears to go to the accumulator... ugh.


I have no idea where this spacer belongs:




I think my soul will need repaired after this transmission.

clinebarger

That plate is beat to hell, Replace It!

700R4 Accumulator pistons are all the same....Forward, 2nd, & 4th. It probably needs New Pistons & Pins in all 3 locations.

That orange spring is the Servo Return Spring.

The Spacer is not a stock part.

unit

Replacements are cheap so why fool with one that could potentially cause problems?

mrvedit

Regardless of your next steps, I recommend the Transgo 46-PLT-96 separator plate for all rebuilds.
I still recommend finding a blown 4L60E on CL (under $100) as a source for some missing or mixed up parts. For example, the 1-2 accumulator inner spring is hard to find (none on ebay today).
As Clinebarger said, you need new aluminum pistons and likely pins too. Sonnax pinless are a possibility, but they still need the stock springs. (The Sonnax Performance pack includes the pinless pistons and new springs, but it is a $125+ shift kit with many other parts.)

Also where are you located. Maybe a nearby member has some spare parts.

Paxun

Thanks guys. I did order a new TRANSGO 700-P plate late last night and two springs (35371D 700R4 4L60E 1-2, 3-4 Accumulator spring, white color).

I will look very closely at the pistons and pins, since you guys are kind enough to lend the advice. Tomorrow I should be able to put a few hours into the trans.

Located near Nashville.

mrvedit

In your original thread you titled it "4L60 (1990) Endplay problems".
I only saw the "4L60", didn't notice the year and assumed a 4L60E.
Since the 4L60 didn't come out until 1992, you have a 700R4, or you wrote the year wrong.
Therefore, I was confused by the title and some of my advice may not be applicable to a 700R4, such as buying a 4L60E on CL for spare parts.

Please confirm exactly what you have, what engine it is going on and what PCM you have.

Paxun

mrv My manual show the 700R4 nomenclature changed to "4L60" officially in 1990, but yes it is essentially a 700R4. RR Stamp reads "0CJM...." making it a 1990. This was changed (to some extreme) for F-Body application before I got my hands on it and it will be used in the same for my purposes. So the PCM would be 1227165. Either way a second trans would be great for me under these circumstances and is a great suggestion. 5.7L application.

I received the new separator plate today and it states that "If the second piston casting code ends with 093 or 95-1 drill holes A & C.093 to .110." I am not sure what they are talking about. Maybe, I will give TransGo a call on this one. I would like to figure out what is unique about those pistons. Anyone here know?

clinebarger

093 & 95-1 are the last 3 digits of GM part numbers, Both are "Vette" 2nd Servo Pistons, Aftermarket "Vette" Pistons do not have OE part numbers on them, If you bought a "Vette" 2nd Servo piston....It is equivalent to a 093/95-1.

093/95-1 pistons have the greatest apply area of all factory pistons, Followed by the 159 trailblazer SS piston, 553 Standard V8/truck V6 piston, 554 Small V6/I4 piston.

Paxun

Perfect! Thanks for this. I did get an aftermarket "vette" servo.

I pulled 5 loose check ***** that were bagged during disassembly. The case had one check ball with the retainer and the auxiliary valve body has another that has a two-tab retainer holding them in place. The Atra shows 5 in the case under the plate that I installed. But, it is showing 2 more to be installed on the valve body side of the plate that were not present. It would be no surprise if the last guy removed them for some reason. Does anyone have an idea what is going on with this? Thanks for all the help guys. Do appreciate all the info.

clinebarger

A 1990 4L60/700R4 takes 4 Check ***** in the case & 2 in the valve body, Being auxiliary valve body eliminates the "Bath Tub" ball in the main VB, Being a '88 & up VB eliminates the Case "Bath Tub" nearest the rooster comb. You will have to plug 2 holes in the 700-P plate.

Paxun

Thanks guys, got the valve body on.

Just a few more questions for assurance, before I install the pan.

1. Servo travel was .090 with new band installed. I do not have the special tool. Adequate, excessive or insufficient?

2. 1-2 accumulator piston/spring stack inside housing. Page 42 & 103 ATSG. Spring first or piston first? Trans model is "CJM" ( I believe a 2wd truck), but application is 5.7L F-Body.

clinebarger

I like to run the Band tighter than that, Around .060"....But .090" will work.

700R4.....With Accumulator up-side down on bench, Install Piston "Dome" down. Legs "Up", Then Spring. Spring will be against the Plate when installed.

Paxun

Thanks again Cline.

I took it for a drive today finally. At first the shifts were late, but VERY firm. Then it starting shifting exactly as expected. Then again it reverted back to being firm and late, so I tapped the gas pedal twice (firmly) thinking the TV cable was sticking and sure enough it went back to shifting correctly.

Do I have a sticking TV piston...? I cleaned everything COMLPETELY.

clinebarger

Could be a sticky TV Plunger and/or TV Valve. With the engine idling in park, Disconnect the TV cable, Lock a pair of Vise-Grips on the aluminum crimp on the end of the TV Cable.
Give it 20 good pulls, & see if that solves your issues.

If that doesn't work....A Trans-Go TV Valve & a new #94 Plunger & Sleeve is a solution. A SK-700 JR. is the cheapest way to obtain a self cleaning TV Valve. Sonnax sells new #94 Plungers & Sleeves.

Paxun

Tried this suggestion a few weeks ago. Drove car twice since and have not had this issue again. Hopefully, that solved.