ZF8 service with ATF machine

MightyBee · Jan 15, 2023

Hello Everybody,

We have a ATF FLUSH machine in the shop but....
Our machine not come with the correct adapter for the Ram ZF8HP70 and not the correct for the Challenger with ZF8HP45.
Our machine vendor cannot help us in Belgium...
I have two question for the professionnal who use this kind of machine.
Do you have a reference or a picture of the adapter ?
Second question, how do you do for bypassing Oil Cooler thermostat in the challenger (mechanical one) (I think you have to connect before the thermostat ? And on the Ram ??? who has another kind of Cooler on the transmission ?

Thank you for your help

Brandon-w · Jan 15, 2023

Honestly I don't Beleive in tra s flushes I've seen too many times where debris gets into the valve body by doing this. Personally I'd just Dump the oil swap the filter and go again. It leaves alot less chances for things to go wrong, especially on these newer transmissions. That's just my 2 cents tho.

Jeepwalker · Jan 15, 2023

Can you just machine or fabricate something (fittings) up?

MightyBee · Jan 15, 2023

I have an idea for the connector with an old cooler tube. But the problem still that the Thermal valve will still close and prevents me to do the flush properly. ZF recommend to do a flush on the ZF8hp but it work great when you don't have a thermal valve... or an electronic one but not a mechanical one.
I know that some people don't recommend to do tranny flush, but I do that for 10 years now without any problem so .... I try to contact ZF and I'm waiting for their answer.
If I cannot find any any or solution for the thermal valve, I'll do like Brandon says..
I don't understand why ZF charge more than 1200$ for a flush in europe for a Dodge Ram if they are not able to perform a full flush because of the thermal valve, 1200$ for just removing the pan and replace 7-8 liters of fluid it's a little bit expensive

Wild one · Jan 15, 2023

MightyBee said:
I have an idea for the connector with an old cooler tube. But the problem still that the Thermal valve will still close and prevents me to do the flush properly. ZF recommend to do a flush on the ZF8hp but it work great when you don't have a thermal valve... or an electronic one but not a mechanical one.
I know that some people don't recommend to do tranny flush, but I do that for 10 years now without any problem so .... I try to contact ZF and I'm waiting for their answer.
If I cannot find any any or solution for the thermal valve, I'll do like Brandon says..
I don't understand why ZF charge more than 1200$ for a flush in europe for a Dodge Ram if they are not able to perform a full flush because of the thermal valve, 1200$ for just removing the pan and replace 7-8 liters of fluid it's a little bit expensive

To do what you're wanting to do,and flush the whole system,you'll want to remove the thermostat before the flush,then reinstall it after you're done.It's easily removed and replaced with a good set of angle nose inner c-clip pliars. The adapter fittings you might have to make though.

MightyBee · Jan 16, 2023

Ok thank you and can I dissambleded the plug of the thermostat to put only the plug on the heater unit ?

Wild one · Jan 16, 2023

MightyBee said:
Ok thank you and can I dissambleded the plug of the thermostat to put only the plug on the heater unit ?

There's pics of the thermostat here.You'll have to remove it,and i think re-install the cap/plug for it,then adapt a fitting of some sort off the cooler lines to do what you want to do.

8hp70 heater bypass

Starting this thread to consolidate some information that we've been discussing (https://www.ramforum.com/threads/revmax-8-speed-thermostat-bypass.171776/unread) on the topic of keeping the 8hp70 cooler than stock. Here you'll see the thermostat assembly broken down into its individual...

www.ramforum.com

Post #263 (3rd pic down) has pics of the bore hole the thermostat sits in,it's a smooth bore non threaded,with just a inner c-clip holding the thermostats end cap in place. To use it as your flush port i think might be tough,as putting some sort of adapter fitting in it for hooking a flushing line to it,that would seal up and hold the flush pressure might be tough.It would make a good port to flush through other then that factor.

RevMax 8 speed thermostat bypass

Took the wife out for supper tonight,we weren't in any rush and we were on 2 lane back roads,so i had the cruise set at 90 kmh's roughly 56mph,our favorite little eating joint is about 40 miles away,tranny just barely got over 110f in her car.

www.ramforum.com

ramrod_2023 · Jan 18, 2023

Hey, did you end up flushing or changing the filter/fluid at the filter fill opening? Also, can you get the temp up in order to force the bypass to open so fluid flows through the radiators? I'm thinking can you do that? I mean driving it till it gets hot enough to open, then disconnecting hoses from the radiator to flush/fill.

2020PW · Jan 18, 2023

Procedure

https://aftermarket.zf.com/app/controller/ti/download/Binary/cd8af64c-40b1-11ed-a2ee-00505690da53.pdf

Wild one · Jan 18, 2023

Fill and check procedure for the trucks.These are the factory instructions that come with a "brand new" transmission from the dealer.

ZF8 service with ATF machine

MightyBee

Junior Member

Brandon-w

Senior Member

Jeepwalker

Senior Member

MightyBee

Junior Member

Wild one

Senior Member

MightyBee

Junior Member

Wild one

Senior Member

8hp70 heater bypass

RevMax 8 speed thermostat bypass

ramrod_2023

Junior Member

2020PW

Senior Member

Wild one

Senior Member

Attachments

Similar threads

Latest posts

Staff online

Members online

Forum statistics

Share this page