Trany fluid / T-case / Front + Rear Differential service

Have a 2003 Tacoma V6 4x4 (TRD, SRS)

Done a good amount of research. So far I've gathered I need to get the below gaskets but have a few questions:

1) Any recommendations on synthetic oil to use? I live in Colorado so dealing w colder temps. Are all 4 the same or is tranny / t-case different than the differentials?

2) Anyone know how much oil to add to each?

Here are gaskets I've got:

Transmission drain plug washer (aluminum) = part #90430-18008 / 90430-A0003, 27 ft lbs, ($1.51/ea)
Transmission fill plug washer (aluminum) = part #90430-18008 / 90430-A0003, 27 ft lbs, ($1.51/ea)

Transfer case drain plug washer (aluminum) = part #90430-18008 / 90430-A0003, 27 ft lbs, ($1.51/ea)
Transfer case fill plug washer (aluminum) = part #90430-18008 / 90430-A0003, 27 ft lbs, ($1.51/ea)

Front diff drain plug washer (copper) = part #

$8 90430-24003 Front Differential Drain Plug Gasket

90430-24003, 48 ft lbs, ($1.74)
Front diff fill plug washer (crush style) = part #

$21 12157-10010 Toyota Oil Drain Plug Crushable Steel Gaskets Set of 10 OEM 12157-10010

12157-10010, 36 ft lbs, ($1.23/ea)

Rear diff drain plug washer (crush style) = part #12157-10010, 36 ft lbs, ($1.23/ea)
Rear diff fill plug washer (crush style) = part #12157-10010, 36 ft lbs, ($1.23/ea)

 

For oil - if you want to use synthetic, then MT-90 is a good choice and you can run it in all four locations. It's not cheap however, so I'd recommend using dino-oil where you can - our diffs/transfer case are more than happy to run Lucas 80W-90, even at cold temps.

Personally - and I just did this on Friday as part of my new-year fluid changes (I drive ~30K miles/yr, mix of highway/dirt) - I put the Lucas 80W-90 in my front diff, t-case, and rear diff, and I put MT-90 in my manual transmission.

As far as amounts... as usual, fill until oil starts coming out of fill hole.

• You'll likely need 5-6 quarts to do the front diff, rear diff, t-case. (I got away with a gallon, which is cheaper + 1 qt)
• You'll need 3 quarts (but won't use all of it) for the manual transmission. Buy 4 quarts, it's a lot cheaper. Or 12 quarts for even more savings)

As far as the crush washers go, this kit is often the best deal you'll find - price wise. I think you still need to get the transmission crush washers in addition to this though.

One last thing - when you're doing the front diff, you might consider replacing the drain plug with one that uses a 14mm hex head, rather than the OEM 10mm allen key. For me at least, it makes removal much less stressful.

​

 

https://www.tacomaworld.com/threads...-thread-compiled-list-of-helpful-links.95271/

 

super helpful, thanks!!

 

Yup looked through but all links around this are either broken or outdated, thanks