Changed my filter and fluid on 8l90 8 speed today

[SuperOldSchool]

Yes, reuse it.

 

[tommyboy180]

You guys reuse the OE gasket or replace?

I replaced but you should be able to reuse it if it's the ribbed version.

 

[richardault]

OP again. Changed again today (fluid and filter) at 130k…. 31k on the fluid. It was still pretty red and not much paste on the magnets.

Also, added the SureCool thermostat to lower trans temps. Good stuff!

View attachment 401349

I was thinking of getting the surecool system, I'm about to do my first transmission fluid change on my 8l90 (2016 Yukon XL denali). Have you noticed a difference since you installed yours?

 

[SuperOldSchool]

I was thinking of getting the surecool system, I'm about to do my first transmission fluid change on my 8l90 (2016 Yukon XL denali). Have you noticed a difference since you installed yours?

It runs about 50-60 degrees cooler than it used to.

 

[irishluder]

I was thinking of getting the surecool system, I'm about to do my first transmission fluid change on my 8l90 (2016 Yukon XL denali). Have you noticed a difference since you installed yours?

I did this a few weeks ago and it runs much cooler, If you are in a cold climate it might be a good idea to warm the vehicle before hammering on it.

 

[SuperOldSchool]

OP again, another refresh at 155k miles - about 25k on fluid.

Just did two extract and refills - 6 quarts each time, then level check. No pan drop with filter change.

I took a quick few minute ride between drain/fill #1 to fully circulate the fluid.

First extract was definitely darker than second.

I plan to do this every 25-30k and hopefully keep the truck running well.

It does shift noticeably smoother after the exchanges.