Why is Transfer Case so easy and Transmission so hard?

[Chris Callanan]

Did a fluid change in both the Transfer Case and the Transmission (8L90) on my 2019 Sierra SLT 5.3...

 

Transfer case takes like 10 minutes - take out 2 plugs - very easy to get to, replace the drain and fill, replace the fill plug.  bang zoom done.

 

8L90?  Take the pan off to drain - can't get the pan off, exhaust in the way...  fill plug on top (was a bear to get back in)....   

 

Just seems they *could* have made the transmission more serviceable...  or maybe I just like complaining

 

  

[2016 Sierra Owner]

Transmissions used to be way more serviceable than they are now! GM wants the masses to bring it to the dealer for service! Most people never do anything with the transfer case so I guess they left that alone for now. 

[Black02Silverado]

Yep, to bring customers in to the dealerships for service. 

[KARNUT]

The transmission service on my Hondas are easier than changing the oil. Servicing the transmission requires multiple drains and fills to do it right. My GMs in the past I did the training through the dipstick. Unless you’re turning over your vehicle around at 100K miles for a new one. Frequently changing fluids are a must for longevity. A single drop a fill along with an oil change at a service center becomes necessary. Probably every other oil change if it’s just one drop and fill. 

[Atlas]

I don't disagree, but some manufacturers are stating transmission fluids are "lifetime" fills. No service required. They're not wrong if a "run to failure" service interval is 150k miles. Might not be what the customer had hoped for, though. Even GM is saying things like 45k service intervals under a severe service schedule. I'd think "severe service" would be more like 15k or a set number of hours, even with synthetic fluids. Every penny they save with eliminating a dipstick, drain plug, and getting you to take it to the dealer funds bonuses...

 

Pretty sure you can buy an 8L90 pan with a drain plug or have one welded into your existing pan. A good fluid pump makes the fill situation easier. Can't do anything about the thermostat needing to be at a set temp in order to properly fill, that part is still a PITA.

 

Then again it's not like they weren't doing this crap 30 years ago. The 4L60 comes to mind... didn't come with drain plugs in most applications, the filters had press-in bushings going into the valve body, and you filled through the dipstick tube...mostly a spill and guess operation.

Edited January 27 by Atlas