Re: Trans fluid change

Posted by BH On 2008/2/12 9:58:05

The Ultramatics originally called for "Type A", which may be NLA.

Some sources cite GM's "Dexron" as being a suitable replacement for "Type A". However, while the characteristic of "Dexron" are allegedly closer to "Type A", some owners have had better results with "Type F". In fact, some who have used "Dexron" reported a groaning noise from the Direct Drive clutch at part throttle, under light loads (which you can "drive" around), but this noise cleared for those who drained and refilled with "Type F".

I think the general consensus is to use "Type F" if your Ultramtic has not been rebuilt or still has OE clutch linings, but use Dexron if it has been rebuilt AND upgraded to GM friction materials.

Someone correct me if I am wrong.