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8 speed fluid and filter change

tlaw91
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rremesal Enthusiast

rremesal

Posted
Posted
you could add a by-pass trans filter to it, and not have to deal with draining the pan anymore..
I wish there was a kit for it... I'd go for it.

Next time, I'm siphoning the old fluid out, add fresh fluid and call it a day. The filter will be ok without replacing.
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tlaw91
tlaw91

After filling 7.4 quarts, install the rubber fill plug and the heat shield. Ok all done! At this time you’ve made a damn mess so I brake clean the exhaust pipe and transmission pan at this time. And

ftwhite
ftwhite

I replaced filter and fluid today. Used the transmission pump to pump most out from cooler line. sucked out some more with extractor from fill hole, and got a little more when I dropped the pan. 

SuperOldSchool
SuperOldSchool

I followed tlaw91’s procedure and a YouTube video and changed my 8l90’s filter and fluid today.   I had dealer do the first time at 45k.  34k later it’s my turn.   I bought a fluid

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flyingfool Senior Enthusiast

flyingfool

Posted
Posted (edited)

amsoil might sell a by pass kit

 

i'm gonna try running this full flow on my truck next. no bypass, just straight thru. i tried a spin on Derale adapter, work well but i feel the anti drain back valve built into a spin on filter is restrictive and causes the trans to operate at 185 degrees. i like to get my temps down to 145

https://www.amazon.com/Professional-Products-10102-Fuel-Filter/dp/B001ELZAUY/ref=pd_sbs_263_2/136-4555928-7921826?_encoding=UTF8&pd_rd_i=B001ELZAUY&pd_rd_r=58e83f13-deaf-42a4-ae96-7bc7f449a471&pd_rd_w=4ALr1&pd_rd_wg=teF7N&pf_rd_p=cc0adad9-73a2-470d-acda-37a71f8758ba&pf_rd_r=2GZSX6XE609X44WF5VX3&psc=1&refRID=2GZSX6XE609X44WF5VX3

Edited by flyingfool
txab Senior Enthusiast

txab

Posted
Posted

Why didn't you use a filter without the drain back valve? Plenty of options out there

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flyingfool Senior Enthusiast

flyingfool

Posted
Posted (edited)

OK just completed the bypass valve with a stock spin on filter, the anti drain back valve may not be an issue yet, i will run it for 500 miles then cut it open to confirm its filtering...

before the bypass valve i was operating at 185F with the trans thermostat deleted too.  now I'm back where i was after the T-stat delete (135-145 F ) 

 

the by-pass valve is a piece of brass machined to accept input and output trans cooler lines, prependicular to this, are two 1/4" fittings that feed my remote spin on filter.  inside the brass valve is a bypass hole  of 1/8"  separating the 1/4" npt fitting, and creating a pressure differential for fluid flow. the valve can be Purchased from Frantz FIlters.

 

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Edited by flyingfool
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flyingfool Senior Enthusiast

flyingfool

Posted
Posted
5 hours ago, txab said:

Why didn't you use a filter without the drain back valve? Plenty of options out there

who sells the screw ons with no anti drain back valve???

txab Senior Enthusiast

txab

Posted
Posted (edited)

Isn't yours 13/16-16? Conflicting info on that amazon page

Edited by txab
flyingfool Senior Enthusiast

flyingfool

Posted
Posted

i belive your correct, but Derale  and WIX both sell adapter center stud in 3/4-16 for $6-$8

https://www.amazon.com/Trans-Dapt-1034-Oil-Filter-Nipple/dp/B000CPZVW0/ref=pd_bxgy_img_2/136-4555928-7921826?_encoding=UTF8&pd_rd_i=B000CPZVW0&pd_rd_r=9ec8b77b-fd0c-4cb1-9e03-f66b91d94587&pd_rd_w=lROd9&pd_rd_wg=yyn3M&pf_rd_p=ce6c479b-ef53-49a6-845b-bbbf35c28dd3&pf_rd_r=R76Q8XA4DEXGZQRCBA6N&psc=1&refRID=R76Q8XA4DEXGZQRCBA6N

txab Senior Enthusiast

txab

Posted
Posted

you can stop by a NAPA and look at the filter in person. NAPA Gold just have them cross the part # or do it yourself. The # will be close to the Wix #

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C Dave Enthusiast

C Dave

Posted
Posted

Sure would be nice if these transmissions came with a spin on filter like the Allison tran does ! Then even a drain plug in the pan. 

 

Bliss

flyingfool Senior Enthusiast

flyingfool

Posted
Posted
46 minutes ago, C Dave said:

Sure would be nice if these transmissions came with a spin on filter like the Allison tran does ! Then even a drain plug in the pan. 

 

Bliss

the Allison is a by-pass filter, theres no need to drop and drain the pan once you got a spin on.  my current set up cost about $80-90 , but the bypass valve is very important to maintain the trans cooling function , without it it will overheat.

  • 5 weeks later...
tlaw91 Enthusiast

tlaw91

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Posted

HEY I GOT A POST PERMANENTLY PINNED ON HERE NO FREAKIN WAY

maybe I should do more of these ‘how to do common things on GM cars’ things

Like your damn battery cables. You all need battery cables [emoji23]


Sent from my iPhone using Tapatalk

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