[Mitch808]

I just check the drum with a straight edge. If it's flat, it's flat.

If you stuck with the oem sized band I probably wouldn't argue with you there. But if you change to the wide band, that's a no no. I hear you can put them on a lathe though and some shops will do that. But there isn't a stated minimum thickness spec I can find otherwise.

 

[Mitch808]

What pin are you referring to? What's wrong with the atsg manual? Clearances for what?

The 3/4 clutch pack clearances and the wideband/pin engagement clearances are way looser than it should be as stated.

The secret sauce the performance trans builders often don't mention it, but if you pay attention, you'll find its way tighter. As an example performabuilt will do the 3/4 clutch pack at like .019 or something like that but the spec calls for around .07. Many builders settle in for around 0.03.

 

[miketx]

The 3/4 clutch pack clearances and the wideband/pin engagement clearances are way looser than it should be as stated.

The secret sauce the performance trans builders often don't mention it, but if you pay attention, you'll find its way tighter. As an example performabuilt will do the 3/4 clutch pack at like .019 or something like that but the spec calls for around .07. Many builders settle in for around 0.03.

I set them all at .040.

 

[miketx]

If you stuck with the oem sized band I probably wouldn't argue with you there. But if you change to the wide band, that's a no no. I hear you can put them on a lathe though and some shops will do that. But there isn't a stated minimum thickness spec I can find otherwise.

Thanks, have you rebuilt a lot of them?

 

[Mitch808]

Thanks, have you rebuilt a lot of them?

Only my own, twice. Dozens of hours on YouTube, and asking a lot of questions in various fb groups.

I really want to learn valvebody vacuum testing but don't want to buy the tools for it.

 

[miketx]

Only my own, twice. Dozens of hours on YouTube, and asking a lot of questions in various fb groups.

I really want to learn valvebody vacuum testing but don't want to buy the tools for it.

It's rare for a VB to be bad. I've seen very few that were actually bad. A good cleaning, including removing some of the valves to clean properly and then running a flat file over the VB assy will fix it up 99 percent of the time.

 

[Mitch808]

It's rare for a VB to be bad. I've seen very few that were actually bad. A good cleaning, including removing some of the valves to clean properly and then running a flat file over the VB assy will fix it up 99 percent of the time.

If you were to believe Sonnax, they market their parts as if they leak like a sieve. 😛

 

[miketx]

If you were to believe Sonnax, they market their parts as if they leak like a sieve. 😛

my close to 40 years experience says otherwise.