Oil recommendation - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Northern lights · 08-05-2009, 11:30 AM

OK, so I have a seal coming tomorrow for my Rockwell t221 (thanks guys for the ID) and can't imagine there being a problem filling it with 75-90 synthetic as I do with all my diffs but, rather than assume, I thought I'd get some thoughts on it. Also, out of curiosity, the 4spd tranny in my truck has the following markings on the drivers side right above the PTO cover. What would it be?.

A66
8
GM
837334

Thanks
C

08-05-2009, 11:30 AM	#1
Northern lights Registered User Join Date: Jul 2009 Location: Whitemud Alberta Posts: 328	Oil recommendation OK, so I have a seal coming tomorrow for my Rockwell t221 (thanks guys for the ID) and can't imagine there being a problem filling it with 75-90 synthetic as I do with all my diffs but, rather than assume, I thought I'd get some thoughts on it. Also, out of curiosity, the 4spd tranny in my truck has the following markings on the drivers side right above the PTO cover. What would it be?. A66 8 GM 837334 Thanks C



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