so my main bering is leaking a crazy amount of oil out of er, i know there common on the 6.5s, my questions are why do they do this? is there any way to prevent it?, and does any one have an idea on how long it'l take to pull the tranny and fix er?

 

What transmission do you have 2WD or 4WD what are your mechanical skills ??? I have had both an automatic and a NV4500 on the ground in about an hour when put the trans back in it helps to have 2 6 inch bolts with the same thread as the bellhousing bolts to use as guides this will save lots of time and trouble and a really good floor jack is priceless IMO

 

No way to prevent it.your rear main seal is constantly riding on crankshaft which turns 6-800 times per minute just at idle.the seal is simply made of rubber and after being 10-20 years old they start leaking. just make sure you buy a good replacement brand one such as victor reinz.fel-pro is junk!

 

Also make sure your CDR valve is functioning properly-it's purpose is to try and maintain a slight crankcase vacuum to prevent oil leaks.

Crankcase pressure makes the seal leak worse.

 

ok cool, and ya i just put a new cdr valve on er this time last year, and my trucks 2wd with a 4l80e, and i work at an auto wreckers so i see stuff like this everyday, but we use hoists there and im not as fortunite as that:p