Eric said any 80/90 would be fine as long as it isn't synthetic. He did suggest to stop at a Ford Dealer and get their anti-slip additive though. I bought 4 quarts of the 80/90 and the additive at my local Ford dealer for $24. Very inexpensive I thought. I read on another site that the Ford gear oil is excellent compared to the off brands you see at the auto parts stores and it is specifically made for Ford designed rear ends.
I've got about 60 miles on mine now and am going to lift the car up and go over every bolt to make sure everything is still as it should be. Otherwise, I finally got on it a little yesterday and it seems great. No gear noise at all. The Strano suspension is excellent as well. I;m not sure I'll be able to get to the track one more time this year. I'll try though.
Location: Ocala, Fl = home Seoul, South Korea = stationed
Posts: 1,592
im a little curious on fluid too. i just bought one this week!! i also have the Strano springs and Koni shocks and its nice to hear there are no problems with them and the 9".
__________________ 2002 Camaro Z28 A4 - UMI sfc phr lca ta, BMR stb, Strano sway bars and springs, Koni 4/4 shocks, p&p tb, Kooks headers, GMMG catback, built up 4L60E.
In progress: 228/230 114LSA Cam, Tony Mamo ported AFR 205's and 92mm FAST, NW 92mm TB, fabbed MWC 9" w/ 3:70's, FLT 4L60E, FTI 3600 stall, PST 3.5" DS, UMI K-Member and A-arms.
I destroyed a perfectly set of Moser 9" gears after 4 passes at the track a few years ago. The gears had 5K miles on them and were quiet too.
I hit the road to return home from the track and they were screaming bloody murder on decell IIRC. Could feel them grinding some too.
Drove it home like this (45 miles) and got the gear case out and it was full of metallic sludge and the backlash was at .040" IIRC.
I was running synthetic 70-90 oil and I blamed it on that cause there was nothing else it could have been. The surface of all the teeth were destroyed from excess heat.
To this day, I will not run synthetic rear end oil. After googleing, I found many folks that encountered the same thing. It appears its about a 50/50 split for the folks that do vs. the folks that dont.
All right....270 miles so far and everything still seems ok. I do have a slight whine, but I did expect something. My exhaust does drown it out. Hopefully I'll be able to get to the track on Sunday and see what happens.
On another note, the more I drive the car, the more I appreciate Strano's combo. It rides and handles better than expected. The man knows his stuff. It's still on his "start here" settings. I'll drive it this way for a while before making any changes.
__________________ 1998 Trans Am...STOCK!
1987 Lt1 t56 Trans Am
"The surgeon general never said 'nuthin 'bout smokin' the competition!"
