MY TRANSMISSION REPAIR 8hp90

[Magnified]

Why would slippage be happening here and not in some other trans with similar throughput?

 

[hellno]

See around the edge here?

View attachment 7447 [/QUOTE]

As far as I know them are casting numbers I’m sure they have meaning but unfortunately I haven’t the answer

 

[Hickster]

Punched part #s. Now the guy whom made and or installed them are fired. Good job.

 

[hellno]

Here’s a clutch application chart that details what is applied in each gear it’s from a ZF8HP45 but it’s the same as the 70 and 90 series

 

[hellno]

Why would slippage be happening here and not in some other trans with similar throughput?

read the entire thread and you will see what I belive caused the burnt clutches ,but I have heard you can adjust pressures in different gears but I will need to talk to curt to confirm it

 

[hellno]

this may be the reason the clutches burnt up lol

 

[moparjim]

Great write up. Sorry you have to go through this. At least the rest of us are learning something new.
The auto trans is the only thing that I haven't been brave enough to try before. LOL

 

[hellno]

 

[Hpindy]

Great write up. Sorry you have to go through this. At least the rest of us are learning something new.
The auto trans is the only thing that I haven't been brave enough to try before. LOL

Jim I told him the worst thing he ever done was Become friends with me........ I seem to cost people a lot of money for some reason .

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[hellno]

unfortunately I wont be able to finish reassembling til Monday or Tuesday because I still have a few parts that haven't showed up

 

[Hpindy]

Is there a difference In the factory clutches and steels VS the alto ones?

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[Hickster]

I am not counting pennies,,, butt this place and the utta place has cost me a bit. More than 2 fiancée's plus rings and cruises. But, I will en tr view the ship fer taco Tuesday and the critter want cause me a problem. But, I do get what I pay for. The younger usually the more $$$. I have a ways to go with this 2018 and learn how to screw it up and fix the clutch. You fix it,, or it says no. No in between. Watched the idiot next door change out the battery on his 2019 Z 01 and a night mare. He works as a mechanic at a performance shop and struggled. Good. This new #c8 is awesome.

 

[hellno]

Is there a difference In the factory clutches and steels VS the alto ones?

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The steels are the same
The alto clutches are considered heavy duty clutches And withstand more heat

 

[Speedy!]

Dang dude, fast work and great info. Auto tans make me nervous and I leave that to the pros like you. I kinda understand the clutch diagram, but can you explain it? So E and D clutches were slipping and those appear to be used in just about every gear.

I had some down time at work today and dug in to some of the trans tuning stuff. There is a TON of stuff you can do in here. Admittedly a lot of it I don't understand because I'm no auto trans expert, but the two of us could probably come up with some good info.

You can definitely set shift pressure per gear as well as clutch ramp time, torque converter fill time, and a bunch of other stuff. I'm gonna look at it some more tomorrow and compare mine to a Demon crate tune and a RE stock tune.

 

[Hpindy]

The steels are the same
The alto clutches are considered heavy duty clutches And withstand more heat

Is this the only upgrades that can be done to the A8?

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[hellno]

Is this the only upgrades that can be done to the A8?

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I’m not actually sure I’m going to make some calls tomorrow, I doubt SHR would share any info but I have plenty of sources to go to

 

[Hpindy]

I’m not actually sure I’m going to make some calls tomorrow, I doubt SHR would share any info but I have plenty of sources to go to

I am curious . There are a lot of solenoids in there . What else could be upgraded besides the clutch packs and steels?

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[cole3986]

Cole look at the e and d pack
The steel s tell it more so then the clutches , now stay off that shine buddy View attachment 7445 View attachment 7446

Sorry, I did not see those photos, now I understand,

 

[Speedy!]

Solenoid pressures can also be controlled in the tune.

 

[Hpindy]

Solenoid pressures can also be controlled in the tune.

Agreed . That's why I'm asking what else is in there that can be upgraded . This I all new to me . I'm use to the 727 lol

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