ATF Fluid Type
Thread Starter
Burning Brakes
Joined: Sep 2005
Posts: 895
Likes: 4
From: whitman massachusetts
ATF Fluid Type
Just had my TH400 overhauled, new shift kit, seals, etc. Sprung for a Huges Performance GM25 to match the requirements of my ZZ383. The tech I talked to at Huges told me to use Ford type F fluid in my new transmission/converter. Any thoughts or info on this before I pour it in!
Team Owner
Joined: Apr 1999
Posts: 21,953
Likes: 1,443
From: Reno Nevada
2024 C3 of the Year Finalist- Modified
Type F has more friction additives than Dextron. I've used F in the past. The up side is more clutch holding power. The down side is more ware on all the parts.
I would use the recommended. If the shifts are to hard then change over to dextron. What ultimately determines the life of the auto tranny is it's operating temp. Always use the biggest cooler possible.
I would use the recommended. If the shifts are to hard then change over to dextron. What ultimately determines the life of the auto tranny is it's operating temp. Always use the biggest cooler possible.
Last edited by gkull; Jul 28, 2009 at 12:23 PM.
Melting Slicks
Joined: Mar 2006
Posts: 3,456
Likes: 102
From: Piedmont Va
St. Jude Donor '11-'12-'13,'19-'20
Just had my TH400 overhauled, new shift kit, seals, etc. Sprung for a Huges Performance GM25 to match the requirements of my ZZ383. The tech I talked to at Huges told me to use Ford type F fluid in my new transmission/converter. Any thoughts or info on this before I pour it in!
I just went throught he same but with Hughes GM20. Same recommendation from Hughes but the tranny guy who did the rebuild told me to stick with Dexron III..that the pure type F would wear out the clutches so thats what I did...tranny works great.
