Dextron III / IV or Synthetic ATF

Dan Fahey · 03-06-2017, 12:11 PM

Corrected Post to Dexron...thanks!

Just bought another PerformaBuilt Trans from Alan Pickering.
Got their Heavy Duty 4L60E Truck version for the 94 Caprice Wagon.
Planning adding a 383 as the current engine has 250,000 miles.
This will complete the powertrain restoration.

Alan recommended any Dexron III or IV and Synthetic is ok.
Going to add a second cooler.

My question.
Does Synthetic AFT offer any advantage over Dexron?
Researching over the internet there is a lot of antidotal information.
Nothing is clear as to which is better for Towing.
Except Synthetic is a lot more expensive.

Looking at the Ounce of Prevention = Pound of Cure.
If it exists in this case.

Need some help.

Dan

03-06-2017, 12:11 PM	#1
Dan Fahey VIP Member Join Date: Oct 2008 Posts: 2,128 Likes: 1,084 Liked 184 Times in 113 Posts	Dextron III / IV or Synthetic ATF Corrected Post to Dexron...thanks! Just bought another PerformaBuilt Trans from Alan Pickering. Got their Heavy Duty 4L60E Truck version for the 94 Caprice Wagon. Planning adding a 383 as the current engine has 250,000 miles. This will complete the powertrain restoration. Alan recommended any Dexron III or IV and Synthetic is ok. Going to add a second cooler. My question. Does Synthetic AFT offer any advantage over Dexron? Researching over the internet there is a lot of antidotal information. Nothing is clear as to which is better for Towing. Except Synthetic is a lot more expensive. Looking at the Ounce of Prevention = Pound of Cure. If it exists in this case. Need some help. Dan Last edited by Dan Fahey; 03-07-2017 at 10:34 AM.