<VV> PG questions

[BobHelt at aol.com]

In a message dated 8/17/2010 5:23:54 A.M. US Mountain Standard Time,  
akinzelm at greatnortherncorp.com writes:

Guys,
Is there any difference between a EM PG and a LM PG?  If  there is, is it 
significant (like, don't put a EM PG into a  LM)?
Thanks,
Andy K.



Hi Andy,
Yes there is a big difference between the Powerglide transmissions used on  
the 140/145 CID engines and the 164 CID ones. That difference is that the 
LM  trannys used higher internal pressures to accommodate the higher torques 
of the  LM engines. So it is always advisable to use a LM PG tranny with a 
LM engine and  vice-versa. 
 
Think if it this way. The manual transmission engines used different clutch 
 pressure plate pressures to match the engines' torque capabilities. There 
were  at least four different pressure plate pressures in production to 
accomplish  this. So why did the factory spend the money to match PPs to the 
applications?  So that there would be no unwanted slip and with long reliable 
life. The same  applies to the PG trannys too. Sure you can "get-away" with 
using an 80 hp  clutch PP on a 164 CId engine. But it's risky. Same applies 
to the PGs  too.
Regards,
Bob Helt