1redta

I’ve had several 4l60s, don’t have the valve body driledl for firm or racing shifts, just a little over stock and leave the pressures alone too. Sonnax sells a variable pressure mod for the trans so you still get a nice shift instead of a kick in the kidneys every time you shift that will ruin your case and break your output shaft

Northeastconfederate

I'm using the Sonnax "Performance Pack" which has the progressive pressure feature you mentioned. I agree totally, I'm not interested in lurching from 1st to 2nd at low speeds, that's for sure!

01WS6/tamu

iTrader: (36)

Not one to argue it but I've built a bunch of 4L60es over the last 30 years and haven't lost a set of altos ever on mine or customers I've used em on.
Is it on a particular brand of tranny you've had the alto failures on now I'm damm curious. Like I said tons of great parts use what you have had best luck with.

BILLY!!!!

Sorry to Hi-jack, I'm trying to avoid making my own post for this.

Does anybody know where you get the clutches and steels for that Smart-Tech® Input Housing Kit with Heavy Duty Input Shaft? i can't find the clutch or steel frictions thicknesses the instructions recommends anywhere
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Northeastconfederate

Either Summit or Jeg's has it as a Sonnax kit. Sonnax part number 77734-01k. Jeg's part number is the same with an 852 prefix, so 852-77734-01k. Roughly $165.

BILLY!!!!

you gotta be kidding me, I've been trying to find this for over a year and it was right in front of me, I'm dumb AF

Northeastconfederate

🤣🤣🤣 Hidden in plain sight...

Northeastconfederate

I'm back on this transmission job, finally. Got it disassembled today. The pan was full of friction material, and when I removed the band, I found where it came from. The band is worn to almost nothing and the drum is smoked! I haven't disassembled and inspected the clutch packs yet. I may have to buy a spring compressor; the one I made for Benz transmissions doesn't seem to quite fit. Maybe I can modify it adequately. I sure don't want to have to wait around for a tool to show up....

Friction material in the pan

Here's the smoked drum with friction material stuck to it in places

And the band with its friction material worn almost completely off

I'm really surprised this thing didn't slip in 4th gear considering how worn the band is. I get that it's a different servo that applies the band in 4th, but still.

I have the Sonnax upgrade parts and a new drum. But I don't have any seals or clutches. Hopefully I won't have to wait too long for those. I probably should have gotten them ahead of time, but I wanted to get in the trans and see what else I might need.

Northeastconfederate

MaroonMonster, if you read this, what's your opinion: Should I glue the magnets to the new, deep aluminum pan?

Also, that pan came with a cork gasket. Use it? Or something else?

MaroonMonsterLS1

Cork gasket is fine
Torque evenly starting by going to the 4 corners first then around in a circle.
108 inch lbs on the tq wrench

Tq it...take a 5 minute break...then at the same tq setting go around in a circle 1 more time.
Pan gasket will never have an issue

As for the magnets.
If you get a filter that has metal top and plastic bottom, there is often some room to fit a magnet there. That works well
Or you can stick one to the park linkage bracket
Or you can glue a couple to the bottom of the pan

Realistically...it's ok to run 2 or 3 magnets
Debris is inevitable after a failure and when rebuilding so magnets help catch it and reduce overall contamination in the unit