[old yukon]

Has anyone installed a Sonnax TCC valve kit ??

After reamering the valve body and following all the steps, i put in the new 77754-04K( Sonnax TCC valve kit for the PMW 4L60e 93 and up) kit.

I followed the line up as per diagram.


The new valves seem tight, to tight compared to the old one.

Is this normal to have them tight, or should they have some play in them ??

[tnsmith10]

are you talking about the valve or the sleeve at the end? the sleeve is gonna be a bit snug. the valve inside that sleeve as long as its free is going to be fine. you dont want any "freeplay" of the sleeve in the bore as that will allow too much fluid to get past and could possibly end up not taking care of the pwm circuit that is known for the p1870 dtc which is what that kit is for.

[old yukon]

Thanks tnsmith10 for the reply.

Yes I mean the regulator valve sleeve is very snug, so that is good. the regulator valve inside is no problem, as it is housed by the sleeve.

The first valve to go in, the isolator valve, is a tight fit. when lubricated it strokes in its bore, but with no play whatsoever, is that OK or will that be a problem when the tranny is running?

[tnsmith10]

Originally Posted by old yukon

Thanks tnsmith10 for the reply.

Yes I mean the regulator valve sleeve is very snug, so that is good. the regulator valve inside is no problem, as it is housed by the sleeve.

The first valve to go in, the isolator valve, is a tight fit. when lubricated it strokes in its bore, but with no play whatsoever, is that OK or will that be a problem when the tranny is running?

as long as it moves, it should be fine. theyre not meant to have any free play as the fluid is supposed to stay in the passage way, and not go though the sides of the valve. there will always be some leakage, but things fitting to loose can cause problems.
the main reason for the kit is to fix the p1870 dtc, what causes the code is the regulator valve wears in the bore of the sleeve and creates too much leakage past the valve.
the sonnax kit is great, but in my personal opinion, the pwm circuit is a waste to have in this trans till they (gm) fix the problem that they created. i just put a check ball on each side of the spring and put it back together. eliminate all that movement that creates the wear. it basically turns the pwm circuit back into a on/off type lock up apply.

[old yukon]

Thanks for that clarification.

Tearing down much or this GM, tranny included, i have seen many design flaws that could be improved on.

As they saying goes: "Day don't build dem like day ustoo!"

[tnsmith10]

ill agree, i liked the simplicity of the older hydraulic controlled transmissions, diagnostics were pretty simple back then, not to mention with the lack of electronics, cheaper too.

[jamesrnz]

i have a 97 blazer that works, but this spring the tcc has quit locking when warm... works when cold, then starts a bit of a slip, then wont lock......


i was interested in the springs and check balls, can you elaborate on that?

tnx

[tnsmith10]

Originally Posted by jamesrnz

i have a 97 blazer that works, but this spring the tcc has quit locking when warm... works when cold, then starts a bit of a slip, then wont lock......


i was interested in the springs and check balls, can you elaborate on that?

tnx

if you look at the pics that old yukon posted, theres a spring shown. what i usually do when i have a 1870 DTC to address, i will take a couple gm valve body check balls and put 1 on each side of the spring. it essentially blocks of the PWM circuit and changes the PWM to an on/off type lockup.