the question is i put a 1/2 quart synthetic tranmission fluin in my torque converter when i reinstalled my rebuilt tranmission. if i use non synthetic tranny fluid to finish filling up the tranmission will this be ok? or do i need to find more synthetic fluid.

Synthetic is compatible with non synthetic, but I would recommend just filling it up with synthetic. Supposedly synthetic ATF will help your mileage a bit, though that's just heresay. I haven't seen the results myself.

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'74 Duster w/ HEI ignition, beat to snot suspension, A904, 8.25" 3.55 SG rear, still being tuned up and gets 17 MPG

Know how they always build a better idiot? That's me

Check the bottle. I've never used synthetic "trans-missile" fluid, but all the other synthetic lubricants say they are compatible with conventional. I'd bet synthetic trans fluid is, too.

"DW"

EDIT: Mr. Jopapa posted as I was posting and he has verified what I had supposed.

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If it ain't broke, fix it!

The synthetic trans fluid is supposed to be more heat resistant than the regular, just like the synthetic engine oil.
I just changed the ATF out of my 833OD trans and put in 2 qts syn ATF and 1 qt 0-30 syn motor oil. It shifts better now and I feel better with some oil in there than all ATF.

Cecil

Great minds & psychopaths, eh?

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'74 Duster w/ HEI ignition, beat to snot suspension, A904, 8.25" 3.55 SG rear, still being tuned up and gets 17 MPG

Know how they always build a better idiot? That's me

I don't know how to take that, Jopapa, so I'm gonna assume it's a compliment...

"DW"
(Demented Wierdo)

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If it ain't broke, fix it!

Well I gotta throw the "psychopaths" part in so that it covers people like me

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'74 Duster w/ HEI ignition, beat to snot suspension, A904, 8.25" 3.55 SG rear, still being tuned up and gets 17 MPG

Know how they always build a better idiot? That's me