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K
Hi everyone,
Needed to purchase tranny fluid for turbo 350 in my 78. Back injury has kept me out of driving her for a long time.. Quite a bit has weeped out, none on the dip stick. What do you recommend? In the past I have used Penzoil ATF Dextron lll for older vehicles. Cannot locate in any of the auto part stores near me. They recommended Dextron VI. I didn't purchase any because I had to many questions they couldn't answer straightforward enough.
What's your thought's on this?
Thanks,
Kenny 78
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Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/
Am-Fm/map light National/Regional/Chapter NCRS "Top Flight"
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Dex VI is full synthetic. It will work just fine in your 350, tho you might notice a leak(or more) after running it in there for a while. The syntetics have smaller molecules, and the fluid will find ANY small opening that will allow a leak. Not sure why you cannot find any Dex III...it's still available. You can also use a Type F(Ford) fluid with no problems, assuming there are NO issues with the trans now. Type F fluid can sometimes firm the shifts up somewhat, due to the friction enhancing formula. Matter of fact, the fluid B&M sells is actually Type F fluid, in B&M containers.
Edited 7/24/2026 7:08:19 AM (AZT)
Joel Adams
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