BW T-5s, which are what late model Fords and Chevvys use, call for ATF. Most
performance oriented people use ATF synthetic. And it's supposed to be
changed every 30,000 miles, tho few do so.
Lots of people on various Mustang sites talk enthusiastically about a GM ATF
called syncromesh available thru Chevy dealers, although I have no
experience w/that product. Don't use 30 weight oil, whatever you do. Makes
me wonder about quality of the rebuilder, suggesting 30-weight.
Al J.
SJC Worldwide wrote:
> Hello Everyone:
> My new hi-po 289 and 5 speed are installed in my Tiger. (Haven't started
> it up yet, though). A questions has come up. The shop that built the
> transmission for me recommends straight 30 weight oil in the gear box.
> The shop that's done the installation recommends ATF (automatic
> transmission fluid) and in fact has already filled it with this. Who's
> right, or is there a definitive answer? My mechanics (who build and have
> run NASCAR cars for years, and do some awesome hot rod cars and have
> done a good number of Tigers through the years) say durability is no
> worse and that shifting is easier with ATF. They say the only reason to
> use 30 weight is if the transmission is noisier than I like. Any ideas
> out there on this?
>
> I'll probably pick up the Tiger on Friday or so. I'll give a full report
> on the conversion later next week after I get some miles on the car.
> I've had a few functional custom things done to it that I'm interested
> in seeing if they work, as I hope they will, mostly in the cooling
> department.
>
> Steve Sage
> 1967 Tiger
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