Hey. Long time since I've posted. The new baby took some time away from the Belvedere but now the engine is assembled and beautifully painted. Before bolting on the 3-speed manual, I want to put fresh fluid in it. I can't find what is required for it. An anyone know? Also, if a synthetic version is available, can I go with it?

3 speed manual is same as 4 speed manual:

Mopar used to use ATF in many of their manual trannies...but I would check to see what is in the gear box at the moment.

You may find oil in the box, in which case a nice 90wt GL-4 (not GL-5) will work fine. You can also use a non-detergent 30wt motor oil. Redline Manual tranny oil is also good...

Synthetics are not as good in this application as the synthetic is a bit 'slicker' than plain oil and can cause your synchros to not work as well causing a lot of missed shifts and grinding to get it into gear.

-D.Idiot

Looks like oil. I would think that it would have a red tint to it if it were atf. Thanks for the help!

I noticed today that in the Chysler service manual for my 69, they recommend Auto Fluid Transmission for the A903 (3 speed manual), but a manual trans gear oil for the 4 speed manual. I was going to ask if this was a mistake, but I guess is not, as from DusterIdiot answer...

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/6 Dodge Charger 69
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