How do you know when to definitively change a transmission spin on filter

[sdowney717]

I am adding a spin on trans filter to the cummins 2005 truck. This filter has an internal bypass set from 7-9 psi.

I am going to add to add a 60 psi gauge on the input to the filter. I was thinking get a new pressure reading, then when the pressure rises by 7 psi, it needs changing idea.

 

[Rand]

do trans filters normally have a bypass? and if so why would it be so low.. I'd spec one of those subaru style 22psi bypass ones If I had to use a bypass equipped filter.

 

[slacktide_bitog]

Spin-on transmission filters don't need to be changed unless they're damaged

 

[atikovi]

I think I'd add an auxiliary cooler and temperature gauge before adding a spin on filter and pressure gauge. What's wrong with the filter already in the transmission? What are you trying to achieve?

 

[sdowney717]

do trans filters normally have a bypass? and if so why would it be so low.. I'd spec one of those subaru style 22psi bypass ones If I had to use a bypass equipped filter.

they do have an in internal bypass.
here it is
https://wixfilters.com/Lookup/PartDetails.aspx?Part=101730

What am I wanting? better filtration.
I have already added another cooler in front of the OEM, it is actually another OEM cooler made by Dorman in series with OEM.
I removed the thermostat from the OEM cooler as it quit working.
I eliminated the problematic seperate coolant to ATF cooler as with age they can leak on the Cummins Ram trucks.

 

[sdowney717]

here are both coolers with intercooler removed., Dorman on top of OEM. Trans fluid is running a lot cooler, I can tell by a hand on the pan. I can now leave my hand on the pan.

 

[sdowney717]

spin on filters do need changing when they clog up, they are no different than any other spin on filter. This spin on has a 28 micron rating. The screen in the pan is about 100 micron rating. An add on Magnefine is about 40 micron and adds a magnet.

 

[atikovi]

Can you monitor temp through OBD2? That would be good to know instead of just by feel.

 

[sdowney717]

Can you monitor temp through OBD2? That would be good to know instead of just by feel.

Maybe, but the code is unpublished.
Planning to add a trans temp gauge, Exhaust temp gauge, boost gauge in the cabin using a 4 hole mount that fits over the mirror.
which leaves me 1 more gauge hole for something else.
I just pulled off pan and it is super clean inside.
Also going to drill a hole and solder in a 1/2" brass bushing to use a 3/8 plug for a drain.

 

[sdowney717]

I brazed in a brass fitting into the pan for a drain. Tried soldering but was not good, too loose lets solder run out. I suppose JB Weld could have done this too.
Simply cut a hole and screwed in the brass fitting. A steel fitting brazed on the pan would have been better and easier. But this is ok. But not cast iron, that can be harder to braze. Got to be super careful not to overheat the brass fitting, cause it will melt into a puddle since the brazing rod and brass are about the same melting point.
It is on and not leaking

 

[sdowney717]

https://www.thoroughbreddiesel.com/...rm=4580221852726538&utm_content=Transmissions
Found an answer here about when it is clogged for my 48re

 

[sdowney717]

Figured out where to put the trans spin on filter, and it is under truck on the frame.
I could have force fit this next to cooler, but I was thinking, I dont want ATF dripping down if I change the filter.

I drilled and tapped for three 1/4-20 grade 8 bolts. And that was TOUGH! Drilling is ok, but tapping is not.
The frame steel seems to be hardened. I broke one tap and had to pound it out of the hole with a punch and 3 lb sledge. I did make a cardboard template to get the holes drilled in the right spot. I used a short tiny wrench to tighten the side bolts.
Retaping worked with a new tap and a new drill. But it is easy to break. Likely better to over drill the hole slightly bigger.
What others seem to do is drill a hole and simply run in a screw, not a bolt.
I will finish this tomorrow. Since its 4x4, I had to make sure the drive shaft wont hit the hose ever, will show how I did that later.

 

[sdowney717]

Works good, PSI halfway warmed up is 12.

wont be rubbing driveshaft

cut out entire oem metal return line, straightened and curved it, beaded the ends and reused a section as I ran out of rubber hose.

2 rubber hoses ziptied here onto the brake lines

more of the new hoses tied in so cant move around. Also made sure they wont rub on anything sharp.

 

[sdowney717]

Up to 15 PSI after another 70 miles of driving, so the filter is cleaning out some debris in the trans fluid.

 

[sdowney717]

Just bought a wix 51525 for a future replacement. It has a 21 micron rating, bypass setting of 8-11.

 

[wpod]

Sooner than later.

 

[ctechbob]

do trans filters normally have a bypass? and if so why would it be so low.. I'd spec one of those subaru style 22psi bypass ones If I had to use a bypass equipped filter.

I would imagine because you don't want to ever starve it for pressure or flow. Better for it to bypass and keep the pressure up to the clutches than restrict the flow too much and end up burning them all up.

 

[weaponoffreedom]

Figured out where to put the trans spin on filter, and it is under truck on the frame.
I could have force fit this next to cooler, but I was thinking, I dont want ATF dripping down if I change the filter.

I drilled and tapped for three 1/4-20 grade 8 bolts. And that was TOUGH! Drilling is ok, but tapping is not.
The frame steel seems to be hardened. I broke one tap and had to pound it out of the hole with a punch and 3 lb sledge. I did make a cardboard template to get the holes drilled in the right spot. I used a short tiny wrench to tighten the side bolts.
Retaping worked with a new tap and a new drill. But it is easy to break. Likely better to over drill the hole slightly bigger.
What others seem to do is drill a hole and simply run in a screw, not a bolt.
I will finish this tomorrow. Since its 4x4, I had to make sure the drive shaft wont hit the hose ever, will show how I did that later.

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great setup, nicely done. In my duramax, I would change the filter and clean the magnet every 15k. Changed the internal filter at 150 and the pan was clean, big deal.

 

[dnewton3]

I brazed in a brass fitting into the pan for a drain. Tried soldering but was not good, too loose lets solder run out. I suppose JB Weld could have done this too.
Simply cut a hole and screwed in the brass fitting. A steel fitting brazed on the pan would have been better and easier. But this is ok. But not cast iron, that can be harder to braze. Got to be super careful not to overheat the brass fitting, cause it will melt into a puddle since the brazing rod and brass are about the same melting point.
It is on and not leaking

Much easier and cleaner is this product (and those like it) ...

https://www.amazon.com/80250-Automatic-Transmission-Universal-Drain/dp/B00029WR78

I've used these several times in various applications; never had one leak and super easy to install.

 

[weaponoffreedom]

Spin-on transmission filters don't need to be changed unless they're damaged

Not sure where you got that from, but that is 100% untrue.

The spin on filter of the Allison 1000 is the filter you change, not the internal filter.