Transmission Oil & Differential Oil

E

Ed Price

Guest
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<font face="Century Schoolbook" color="#0000ff" size="4"><span class="812492400-16022007">The recent comments about oil brought up another old question about oil for the differential.</span></font>
<font face="Century Schoolbook" color="#0000ff" size="4"><span class="812492400-16022007"></span></font>
<font face="Century Schoolbook" color="#0000ff" size="4"><span class="812492400-16022007">We already know that a GL-4 rated oil is chemically the right oil to use in our transmissions, and, because the trans oil also lubricates the differential (transaxle), we have no choice of a different oil there. But I had always heard that standard transmission (manual, not automatic) oil did not have the "film strength" to withstand the extreme contactpressures at the hypoid / pinion gear interface. Since the old RWD cars had a separate case for the differential, you were supposed to never put any plain gear oil in there. You were supposed to always use a gear oil that was "Hypoid" rated.</span></font>
<font face="Century Schoolbook" color="#0000ff" size="4"><span class="812492400-16022007"></span></font>
<font face="Century Schoolbook" color="#0000ff" size="4"><span class="812492400-16022007">Amphicars certainly have a pinion gear, although maybe the little gear on the transmission output really isn't preciselya hypoid, but it's close enough. I don't see Amsoil saying anything about their gear oil having a "Hypoid" rating. What about that?</span></font>
<font face="Century Schoolbook" color="#0000ff" size="4"></font>
<div align="left"><font face="Century Schoolbook" color="#0000ff" size="4">
<div align="left"><font face="Century Schoolbook" color="#0000ff" size="4">Ed Price</font>
<div align="left"><font face="Century Schoolbook" color="#0000ff" size="4">El Cajon, CA USA</font>
<div align="left"><font face="Century Schoolbook" color="#0000ff" size="4">67 Rust Guppy</font>
<div align="left"><font color="#0000ff" size="4"></font></font>

<div align="left"><font color="#0000ff" size="4"></font>
 
E

Ed Price

Guest
<table>
<font face="Century Schoolbook" color="#0000ff" size="4"><span class="812492400-16022007">The recent comments about oil brought up another old question about oil for the differential.</span></font>
<font face="Century Schoolbook" color="#0000ff" size="4"><span class="812492400-16022007"></span></font>
<font face="Century Schoolbook" color="#0000ff" size="4"><span class="812492400-16022007">We already know that a GL-4 rated oil is chemically the right oil to use in our transmissions, and, because the trans oil also lubricates the differential (transaxle), we have no choice of a different oil there. But I had always heard that standard transmission (manual, not automatic) oil did not have the "film strength" to withstand the extreme contactpressures at the hypoid / pinion gear interface. Since the old RWD cars had a separate case for the differential, you were supposed to never put any plain gear oil in there. You were supposed to always use a gear oil that was "Hypoid" rated.</span></font>
<font face="Century Schoolbook" color="#0000ff" size="4"><span class="812492400-16022007"></span></font>
<font face="Century Schoolbook" color="#0000ff" size="4"><span class="812492400-16022007">Amphicars certainly have a pinion gear, although maybe the little gear on the transmission output really isn't preciselya hypoid, but it's close enough. I don't see Amsoil saying anything about their gear oil having a "Hypoid" rating. What about that?</span></font>
<font face="Century Schoolbook" color="#0000ff" size="4"></font>
<div align="left"><font face="Century Schoolbook" color="#0000ff" size="4">
<div align="left"><font face="Century Schoolbook" color="#0000ff" size="4">Ed Price</font>
<div align="left"><font face="Century Schoolbook" color="#0000ff" size="4">El Cajon, CA USA</font>
<div align="left"><font face="Century Schoolbook" color="#0000ff" size="4">67 Rust Guppy</font>
<div align="left"><font color="#0000ff" size="4"></font></font>

<div align="left"><font color="#0000ff" size="4"></font>
 
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