1978 Chevy K20 longbed with nearly 500,000 miles! LS Swap begins!

[Nick_R_23]

The transmission adapter seal wasn't included in either the transmission or transfer case kits, go figure! I swung by the parts store and picked one up, as well as a pinion seal and some vent line.



The new seal is installed!



Coupler sleeve installed!



Mated to the transmission.



Before going any further with the engine and transmission, I wanted to address this pinion seal leak on the front axle. Eventually, the outer seals and U-joints will be replaced as they are worn out also, but for now I wanted to knock out this one, as it'll be much easier without the engine in the way.

Here's a trick I use to hold the yoke from spinning while removing the nut. You can also see that I've written how many turns the nut took to remove, in order to set the nut back in the correct place and not affect the pinion crush sleeve.



Removing the yoke.



New seal installed!



Yoke back in place and nut tightened back to it's original position.



Part of the reason these seals are all bad is because of the vent system. The hose was cut and packed full of dirt, and the nipple was half broken off.



Tapping the hole for 1/8" NPT.



New, better fitting installed.



I ran new vent line for the front axle.





Replaced the upper line as well.