Rear Diff Cover Replacement

IMHO it doesn't really matter how much oil it holds. As long as the fill plug is roughly the same height in relation to the base, what's inside should be bathed in ample fluid, and not high enough levels that it'll travel into other areas.

In that regard, as long as you clock the fill plug properly so it's at a good height, you should be fine. It looks like it may be a smidge higher on the new one, but it doesn't appear too high to me.

 

PS - @ThatYeti which specific Dorman p/n did you order? Only because I'm not seeing it as I look back.

 

Looks like it was 926-958

Dorman 926-958 Rear Differential Cover Compatible with Select Toyota Models (OE FIX)

$62 Dorman 926-958 Rear Differential Cover Compatible with Select Toyota Models (OE FIX)

https://www.amazon.com/dp/B07MFWBVF7

 

I was able to get a local welder to install the cover last week. No issues at all, I think it turned out pretty good. I used Por 15 rust preventative after the cover was welded on. This is the part I used:

$102 For Toyota Tundra 2000-2006 Differential Cover | Rear | Stamped Steel | with Filler Plug | Replacement For 42110-34120, 42110-34121
926-958

Here's a before, in the midst of and after photos.

 

I worked at dorman for about 5 years they would often buy the rights to make and market parts for specific models and years but not others to keep it cheaper to aquire. Often as a rrsult parts will fit models not listed and their help technicians will have no idea