TH 350 oil suggestions

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TH 350 oil suggestions

Postby 71GTKammback » Sun Feb 25, 2018 9:22 pm

In the process of rebuilding the stock 305 V8 from the cam up. I have learned a lot about oils and what oil to use in my flat tappet cam smallblock. Once it is back in and running well I plan on changing the fluid and filter in the stock TH350. Car has 62k on it and the transmission works perfectly. So, what are people's thoughts on the best/correct auto trans fluid to run in a stock TH350 with an essentially stock 305 v8 in front of it. Stock Posi rear end.

Thanks. George NW Washington
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Re: TH 350 oil suggestions

Postby spencerforhire » Mon Feb 26, 2018 8:06 am

If it were a race transmission, I'd tell you to put something synthetic in there like Royal Purple, but I think with a stock trans there is no need to over-think your choice. Any name brand Dexron-type trans fluid will do. You're not going to get all the old stuff out anyway when you drop the pan; there will still be 2+ quarts left inside the converter and other areas.
The "fleet"-
77 Vega Estate wagon- project(someday)will have TPI305/T-5, S-10 spindles/axles
72 Vega HB Drag Car -383/'Glide/9"(9.35@146.19)(5.94@117.28 1/8th)
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Note- the very act of listing all of these has made me realize I have some kind of problem.....

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