Thread: ZF4HP22 do it yourself overhaul

Originally Posted by haydent

Yes, after reflecting on it, I ordered a master rebuild kit. Re the pump, apart from visual inspection and what can you do about it ? Does a master kit have anything for it ? As the exploded parts list just shows pump as one part.
Im not doing any upgrades. But will look into the teflon seals. What could be wrong with the TC ? As soon as we start talking getting external labour the price gets beyond the value of the box...

I wouldn't take the chance on reinstalling the TC as is, at the very least it will be full of clutch debris

Originally Posted by rick130

Cheers Craig.

It's only $$ and time, right?

It's been shifting really sweetly but the t/case is coming out in the next few months for upgrades so reckoned I may as well pull the 'box and do the TC and flex plate, too. I have a HD flex plate ready to go in, it'll be on way out at current km's.

Once all that's done, then I can remap.
Bit where do I stop??!!

Between the TC upgrade and the remap, that should charge up the smile counter for at least a year or two.

As you're fitting the heavy duty flex plate I assume you'll be modifying the TD5 converter?

Originally Posted by discorevy

Between the TC upgrade and the remap, that should charge up the smile counter for at least a year or two.

As you're fitting the heavy duty flex plate I assume you'll be modifying the TD5 converter?

Yep.

The plan is a TCT V8 converter

Originally Posted by rick130

Yep.

The plan is a TCT V8 converter

Not familiar with the TCT stuff, do they still use the TD5 flex plate?.
Seeing that you just bought a heavy duty TD5 plate I'm guessing so

Originally Posted by discorevy

Not familiar with the TCT stuff, do they still use the TD5 flex plate?.
Seeing that you just bought a heavy duty TD5 plate I'm guessing so

They used to, I hope they still do

I've had the flex plate, ATB, and t/case bits for about 8 or 8 months.
Can't rush these things

Originally Posted by discorevy

I wouldn't take the chance on reinstalling the TC as is, at the very least it will be full of clutch debris

From what i can tell, Anything that came off a clutch would end up in the sump after, and then get taken out by the filter before going back into the system.

Originally Posted by haydent

From what i can tell, Anything that came off a clutch would end up in the sump after, and then get taken out by the filter before going back into the system.

Small debris gets through, it's only a mesh filter, it'll be through everything inc cooler.

Torque converters are commonly the first thing to go wrong with these transmissions when not maintained


It's your vehicle though!

Originally Posted by discorevy

Small debris gets through, it's only a mesh filter, it'll be through everything inc cooler.

Torque converters are commonly the first thing to go wrong with these transmissions when not maintained


It's your vehicle though!

Thats what i wasnt sure about is the capability of the filter.

How could a problematic torque converter cause damage to the tranny ?

I will make enquires though about cost at shop in nearby town.

Originally Posted by haydent

Thats what i wasnt sure about is the capability of the filter.

How could a problematic torque converter cause damage to the tranny ?

I will make enquires though about cost at shop in nearby town.

The lockup clutch sheds friction material.
The standard clutch itself is pretty marginal in terms of torque capacity.
And the vanes can come loose in the converter, the inefficiency increases running temps of the fluid putting further strain on the friction material throughout the trans, the valves, check valves, etc

And as discorevy says, the filter is only a mesh gauze, more a strainer than a filter.