Differential Drain ? - ZR-1 Net Registry Forums

902066 · 10-29-2016

Changing gears from 3:73 to 4:10. While I am at it I wanted to add a drain for the lube. Thinking about going quick and cheap, by drilling a drain hole in the carrier and using the Bat Wing bottom bolt as a drain.
Question is how well does this work, and does the Bat Wing cover bolt ever develop a leak? Going to use The Right Stuff RTV for the cover sealant. Thanks Jim

Dynomite · 10-29-2016

I would not complicate it............Just drill and use a 1/8" pipe tap for a 1/8" Pipe Plug as shown which gets you at the Bottom of the Differential Case.

See Item #4 LT5 Added Systems

I placed the Differential Drain Plug just on the Drivers Side of what I call the Molding Seam in the Center of the Flange Thickness.
The kit provides a template that puts the hole just left of the center bolt in the valley of the differential.
Original Photos provided by Scrrem on another topic with Red notes added.

10-29-2016	#1
902066 Join Date: Jul 2005 Posts: 189	Differential Drain ? Changing gears from 3:73 to 4:10. While I am at it I wanted to add a drain for the lube. Thinking about going quick and cheap, by drilling a drain hole in the carrier and using the Bat Wing bottom bolt as a drain. Question is how well does this work, and does the Bat Wing cover bolt ever develop a leak? Going to use The Right Stuff RTV for the cover sealant. Thanks Jim

10-29-2016	#2
Dynomite Join Date: Aug 2009 Location: South Dakota/California Posts: 3,788	Re: Differential Drain ? I would not complicate it............Just drill and use a 1/8" pipe tap for a 1/8" Pipe Plug as shown which gets you at the Bottom of the Differential Case. See Item #4 LT5 Added Systems I placed the Differential Drain Plug just on the Drivers Side of what I call the Molding Seam in the Center of the Flange Thickness. The kit provides a template that puts the hole just left of the center bolt in the valley of the differential. Original Photos provided by Scrrem on another topic with Red notes added. __________________ Left Clickable links -Solutions- LT5 Modifications/Rebuild Tricks Low Mileage ZR-1 Restoration 1990 Corvette (L98) Modifications LT5 Eliminated Systems LT5 Added Systems LT5/ZR-1 Fluids 1995 LT5 SPECIFIC TOP END REBUILD TRICKS Last edited by Dynomite; 10-29-2016 at 08:37 PM.