4WD
$50 site donor 2024
Yes … the design was and they build their own based on the design … Last I knew … the GM is rated slightly higher …
2021 Chevy Duramax transmission pan replacement (PPE) and oil filter change
- Thread starter wwillson
- Start date
4WD
$50 site donor 2024
Nice - it should cool a wee bit …
I have seen it stabilize at a lower temperature. I don’t know that I can give you an accurate number.
I also have changed how I use my truck and I think that is the biggest factor. I usually only tow in 5th gear and keep RPMs above 2,000. This helps with EGTs and transmission temperature. The TC also stays locked up better and doesn’t shift as much.
Just my $0.02
the trick to draining tranny oil without any special tools or pumps is to look at the pan, and most tranny pans almost always have one short flat side while the other sides are curved or otherwise not a straight line.. you want to get yourself one of those throw away aluminum turkey sized cooking pans if you dont have any suitable draintainer... now identify which is the flat side of the pan... crack all the threaded fasteners loose.. but dont remove... now start removing all the threaded fasteners except on that one flat side of the oil pan.. take all out except the flat side, then put one bolt in the opposite side in a few turns... now crack the pan gasket loose if it hasn't already began dripping... now loosen the bolts on the one side of the pan not previously removed... and proceed from there.. you remove that lonely bolt and then start gradually removing the flat side of the pans bolt, this lets the pan tilt down... then shove the pan back to the trans case by hand, and remove the remaining threaded fasteners..... now get ahold of the pan and take it off.. it's not that bad once you get the hang of it.
Wilson, curious if you gave any thought to using Castrol Transynd..? that is generally Allisons high end fluid... donm't know if they actually recommend it for the baby Allisons in the GM pickups trucks
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No, this isn't an Allison transmission, contrary to the GM marketing department. I'm sure Allison TES-295 would be good and TES-668 would be even better. However, the fluid I put in is a formula HPL blended based on an add pack that is designed for this transmission, by an add pack company that has a ton of data that shows this add pack works best for the 10 speeds. Would the Allison fluids work? I'm sure, but I'm going with a formula based on data and supplier reputation.
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- Oct 30, 2021
- Messages
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Quality fluid is a must and HPL Checks all the boxes
Wow - lots of similarities with common and nearly common parts. I've read that GM and Ford co-developed the light duty 10 speeds and the HD 10 speeds and this seems to leave little doubt.
Great write up wwillson, you are making me rethink my decision to just do a spill and fill on my truck. I may just have to get one of those pans after all.
dnewton3
Staff member
For those who don't want to spend hundreds of dollars on a specialty aftermarket pan ...
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These plugs work great. I've installed them on probably a dozen cars over the years and never seen one drip or leak and probably 200k miles of use.
And these are only $13, give or take a bit.
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These plugs work great. I've installed them on probably a dozen cars over the years and never seen one drip or leak and probably 200k miles of use.
And these are only $13, give or take a bit.