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Re: Synchro shift additive

OK, this product is made by BG, makers of 44k fuel injector cleaner 
(great stuff). Synchro shift is not an additive, but a synthetic 
transmission fluid. It's good stuff. We run it exclusively in all the 
race car transmissions.

As with any synthetic fluid, one has to make sure that the fluid is not 
too slippery such that the synchros don't sync up the input/output shaft 
gears. This is the "crunch" one can hear when shifting.

Synthetic fluid is typically used to improve shifting in cold weather 
scenarios. It may possibly improve shifting in warm weather, but YMMV...

Filippo Morelli
Datsun Dynamics