OK, bearing in mind that I know just enuff about automatics to get myself in trouble, heres what I have found so far on my slip-shifting C6

Replaced valve body, no noticable difference

Checked Vaccum modulator (screw was way backed out) and replaced with another that tested good on the mighty-vac, also checked for stuck valve behind the modulator, its free

Performed control pressure test according to the Transtech manual I got from Summit. Results are

Idle, 15" vaccum on the mighty vac applied to the modulator

P 75lbs
R 120Lbs
N 75Lbs
D 75Lbs
2 75Lbs
1 75Lbs

1000 Rpm, 10" vac

P 120lbs
R 150Lbs
N 120Lbs
D 120Lbs
2 120Lbs
1 120Lbs

1000 Rpm, 2" vac

P 125lbs
R 240Lbs
N 125Lbs
D 125Lbs
2 125Lbs
1 125Lbs

Removed the pan and body and performed a air test on the clutchs... all of them give a "thoop" type sound, except the one for the forward clutch, which purges thru the convertor hole?

According to the book, low line pressure in D 2 and 1 shows a bad forward clutch, my questions are

1) Am I reading the results right?

2) Assuming that I am, is there anything else I should look at doing while I have the trans out? I already have a new TCI streetfighter valve body that came today, and the trans has a new R servo and E lever, as well as a extra wide 2nd gear band that looks to still be good even tho there was some slippage (trans has maybe 100 miles on it since I put the 2nd gear band in)

I'm looking at the TCI Master Race kit, which has heavy duty blue clutches and all the various gaskets and seals, steels, etc for a basic overhaul, minus the valve body and 2nd gear band (which I will reuse and add the new Valve body I got today, along with a new TCI streetfighter govenor)

The truck is a 90 F250 Ext cab long bed 4x4 (read HEAVY curb wt) with a 429 CJ (roughly 550Hp, 550Tq flywheel) TCI 2000 Saturday nite special convertor, and 3.55 gears on 315/75 (35") tires

Thanks!

 

Sounds like something is wrong with the forward clutch,or maby the pump gasket is leaking.

 

I'll know for sure this afternoon... just got back from Summit and picked up a TCI master racing kit to go thru the clutches and seals, etc. Just going to go ahead and overhaul the whole thing and get it over with

 

Update, rebuilt the trans (the clutches were good, but since I had the new ones...) Pulled the forward clutch and the inner seal was worn, new seals, valve body, etc and it shifts like it should, solid at low speeds and floor it, 1st to 2nd at 55 and a slight chirp of rubber!!