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Old 03-14-2018, 05:24 PM   #1
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GM 4L85-E trans

What is recommended A/T fluid for this trans. Are there any known weak points with this trans. Its in a '07 Itasca 29 1/2 footer (Model 29R) I'm looking at. Has the 8.1 L motor. Thanks
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Old 03-14-2018, 08:38 PM   #2
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What is recommended A/T fluid for this trans. Are there any known weak points with this trans. Its in a '07 Itasca 29 1/2 footer (Model 29R) I'm looking at. Has the 8.1 L motor. Thanks
It MAY have been OE with Dexron 3, but since ALL the Dex 3 currently on the market is not necessarily exactly what GM originally certified, I would switch to TranSynd, or one of the other brands meeting the Allison TES-295 standard. Any of those ARE better than the Dex 3, and are compatible with the older fluid that will remain in your tranny. Buy Transynd fluid at Allison distributor for the best price. Visit Allison website to learn what other brands qualify for the TES-295 standard.
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Old 03-15-2018, 04:51 AM   #3
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Transmission

Is this trans, (listed as HMD, 4L85-E on build sheet) built by Allison Division of GM?
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Old 03-16-2018, 09:57 PM   #4
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Is this trans, (listed as HMD, 4L85-E on build sheet) built by Allison Division of GM?
The 4L85E is a GM transmission, updated 4L80E. Not sure what they updated, maybe heavier planetaries or added clutchs ect. I've had 2 4L80E trans and never had a bit of trouble out of either one. I pulled a race car and golf car on a 18ft open trailer for 7 years with my 95 Challenger, narry a problem.

I do like the Allison 5 speed better though.
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Old 03-20-2018, 09:01 PM   #5
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The only difference between the 4L80e and the 4L85e is that final planetary is 5 gears instead of 3. There are difference based on years.
As far as trans fluid, I would be VERY careful about what you use. The 4L80/85e has a special variable slip torque converter lock up that is unique to GM - patented. Because of the variable slip, the clutch plates are very porous, so that the fluid can run through the clutch plate to keep it cool. As such, the fluid has unique coefficient of friction, as well as is able to stand up to an incredible amount of heat.
So that trans has unique fluid that should be changed often.
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Old 03-22-2018, 02:16 AM   #6
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According to a pro (over 40 yrs) trans builder I spoke with in Grants Pass, Or. (Jerrys Clutch and trans) with my 4L80E he specifically said to use Mercon V fluid.
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