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GV's website says - Fluid type - GM#1052271 petroleum based or GM#12346190 synthetic.
Ken, thanks for the head's up. The Dexron II ATF is right out of their installation manual. But, maybe it hasn't been updated. It's worth a call to them to verify since I haven't gotten it out on the road yet. I'll try to check out their website this afternoon.
I think the recommendation depends on the local climate. Rick Johnson told me to use a 50/50 mix of Dexron II (or any ATF) and 75/90 GL4 here in the UK.
1970 Road Runner
505 cid
MCH CNC ported Stealth heads
MP 528 camshaft
4 speed
GV overdrive
11.98 @ 117 on street treads
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