Shifting_Gears
Well-Known Member
- Joined
- Sep 13, 2018
- Threads
- 88
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- 2,026
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- Location
- South Florida
- Vehicle(s)
- 2016 Mustang GT
- Thread starter
- #1
I want to first give a shout out to Optimum Performance for putting this kit together. I am one that will scrutinize the details prior to purchasing parts/fluids/tires etc. Optimum makes an awesome kit for anyone that is interested in using BG Products Syncho Shift II and their differential fluid.
After a lot of research on here, I settled on the BG Sychro Shift II/LS Guard differential fluid. I did email BG directly to confirm the Synchro Shift II fluid met Ford spec, in case it ever came into question. I went with the 75w140 due to the hot Florida summers and the fact the exhaust is constantly baking the rear diff.
I rented a lift at a local garage to do the dirty work, which was a pretty sweet experience. The kit OP puts together has instructions for both the trans and diff, pumps/hoses for the trans and diff, thread tape for the diff drain/fill plugs and is packaged meticulously. The shop owner was equally impressed.
The service itself was super easy with the car in the air. I was surprised by the fact that both fluids looked pretty good coming out (40k, original fluid). The trans fluid was a little dark and man that stuff is thin.
I can 100% say I do feel a difference in shifting after changing it. It feels smoother than when I drove there with the factory fluid. Never really had lockout issues so I can't speak to that, but it just felt better changing gears. I imagine this has to do with the change in the fluid viscosity. The rear, can't really speak to. The Torsen is business as usual and I haven't hammered on it to notice if there's any change in lockup. To clarify, the kit includes a limited slip modifier so there's no need to add any. Some debate the effectiveness of it with the Torsen anyway.
After a lot of research on here, I settled on the BG Sychro Shift II/LS Guard differential fluid. I did email BG directly to confirm the Synchro Shift II fluid met Ford spec, in case it ever came into question. I went with the 75w140 due to the hot Florida summers and the fact the exhaust is constantly baking the rear diff.
I rented a lift at a local garage to do the dirty work, which was a pretty sweet experience. The kit OP puts together has instructions for both the trans and diff, pumps/hoses for the trans and diff, thread tape for the diff drain/fill plugs and is packaged meticulously. The shop owner was equally impressed.
The service itself was super easy with the car in the air. I was surprised by the fact that both fluids looked pretty good coming out (40k, original fluid). The trans fluid was a little dark and man that stuff is thin.
I can 100% say I do feel a difference in shifting after changing it. It feels smoother than when I drove there with the factory fluid. Never really had lockout issues so I can't speak to that, but it just felt better changing gears. I imagine this has to do with the change in the fluid viscosity. The rear, can't really speak to. The Torsen is business as usual and I haven't hammered on it to notice if there's any change in lockup. To clarify, the kit includes a limited slip modifier so there's no need to add any. Some debate the effectiveness of it with the Torsen anyway.
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