Re: Gearbox oil

Posted by rvsls On 2016/5/1 22:52:01

Go point! I have only used it to top off the 37 Packard rear end so there has been little dilution. Will be doing some routine maintenance on the 37 shortly and will drain and refill with a GL5 oil. The Penrite 250 is good for trans and rear ends with yellow metal which the Cadillacs have. I see that Penrite makes a GL5 but says no yellow metal. Does anyone know if there are brass parts in the 37 120 rear ends?
Thanks for the tip,
Rod Smith, Reno NV