metalgraver 12 Report post Posted February 21, 2014 I am dismantling my 69 Mach 1 for a total restoration. I pulled the rear end out last night. The numbers on the tag are WES-AA 9GC 3.00 9 952A. I looked these numbers up and it looks like I have a 9" with 3.00 gears. Also it is not a Posi-traction. I will be putting back in the 351W with a T5 transmission behind it. The 351W will have some slight upgrades such as a new intake and mild cam but nothing to run on the track. How will this rear end perform with this set up as a daily driver? or an occasional street race? Should I consider replacing the gears to something like a 3.50 and should I turn it into a posi-traction? :online2long: Quote Share this post Link to post Share on other sites
fvike 173 Report post Posted February 21, 2014 It will do just fine. If you want to upgrade, I'll recommend a Detroit Tru-Trac diff. Very happy with mine. I run 3.70 gears. Quote Share this post Link to post Share on other sites
Zipppo 11 Report post Posted February 22, 2014 Depends on the type of driving you will be doing in my opinion. 5 speed with 3:00 open on freeway will get you good MPG and low rpm. Go with a Posi if you are gonna drag race and yes if racing is what you will do go with like 3:91 or 4:10 out back. Otherwise just leave it be Quote Share this post Link to post Share on other sites
metalgraver 12 Report post Posted February 24, 2014 I thought so. I will not be dragging it on the strip, maybe an occasional midnight run for fun. Can I do the upgrade myself? Quote Share this post Link to post Share on other sites
