Click on image for the lowdown. 
====
| | | Forums66 Topics128,129 Posts1,056,695 Members48,452 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
| | THANKS!
For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Aug 2005 Posts: 7 Junior Member | | Junior Member Joined: Aug 2005 Posts: 7 | I set out to change the lube in the rear end of my 1949 4100, single speed rear end. I found the fill plug, but was unable to find a way to drain it. What am I missing? Do I have to remove the rear housing to get it drained. I'm worried about finding a replacement gasket, if I do.
Any ideas appreciated. | | | | | Joined: Jul 2004 Posts: 5,708 'Bolter | | 'Bolter Joined: Jul 2004 Posts: 5,708 | Jaskey,
I 'think' you can pull the fill plug, then remove one or two of the bottom bolts from the cover and, voila, out comes the lube. Removing the fill plug acts as a 'mega-vent'. Just put a little silicone on the bolts when you stick them back in.
Stuart | | | | | Joined: Jul 2006 Posts: 584 'Bolter | | 'Bolter Joined: Jul 2006 Posts: 584 | I just sucked my fluid out the fill hole. Worked fine. Sure I missed a tiny bit of gunk at the bottom, but got 98 percent of it. | | | | | Joined: Mar 2002 Posts: 9,115 'Bolter | | 'Bolter Joined: Mar 2002 Posts: 9,115 | I concur with removing one or two of the bottom cover bolts as that is what worked for me. The filler plug will work as an air inlet. | | | | | Joined: Aug 2005 Posts: 7 Junior Member | | Junior Member Joined: Aug 2005 Posts: 7 | I think I will try removing a couple bottom bolts, with the filler plug out.
Thanks to all for the suggestions. | | | | | Joined: Jul 2006 Posts: 187 Wrench Fetcher | | Wrench Fetcher Joined: Jul 2006 Posts: 187 | I pulled off the whole cover just to look at the condition of every thing. Gives me a chance to clean out the gunk in the bottom and blast and paint the cover before using a good RTV and sealing it back up. I had a previous post on the crud in the rearend. No way was that thick stuff coming out by just removing a couple of bolts.
'36 Tall cab Chevy 1.5 ton, '36 Low cab Chevy 1.5 ton, '53 GMC 2 ton, '51 GMC 640 5 ton, '47 Dodge 2 ton, '42 GMC CCKW 353 6X6.
| | | | | Joined: Aug 2005 Posts: 7 Junior Member | | Junior Member Joined: Aug 2005 Posts: 7 | So, you just ran a bead of RTV (silicon ?) around the cover when you put it back on. No gasket?
I like the idea of seeing the condition of everything inside.
Thanks! | | | | | Joined: Jul 2006 Posts: 187 Wrench Fetcher | | Wrench Fetcher Joined: Jul 2006 Posts: 187 | Yeah, just run a bead of black RTV around the cover, smooth it out around the bolt holes just enough to get about an 1/8" thickness put the cover on and start your bolts. Tighten evenly and wipe off any excess, or wait till it dries and cut any excess with a razor blade. I've done it ton's of times. No leaks. 
'36 Tall cab Chevy 1.5 ton, '36 Low cab Chevy 1.5 ton, '53 GMC 2 ton, '51 GMC 640 5 ton, '47 Dodge 2 ton, '42 GMC CCKW 353 6X6.
| | | | | Joined: Aug 2005 Posts: 7 Junior Member | | Junior Member Joined: Aug 2005 Posts: 7 | I'm going to give it a try.
Thanks! | | | | | Joined: Apr 2003 Posts: 608 Shop Shark | | Shop Shark Joined: Apr 2003 Posts: 608 | Jaskey, Another old trick to make yer own gasket,if ya dont gottsa new one is to use a cover from a Pizza Box  Not the serrated kind like Dominoes. The flat one piece sheet that most reg mom an pop stores have!  Regards............ | | | | | Joined: Jan 2007 Posts: 176 Wrench Fetcher | | Wrench Fetcher Joined: Jan 2007 Posts: 176 | RTV Will work fine, that's what was used even from the factory on many of the later trucks.
1970 C50 dump! saving orphans from the CRUSHER
| | |
|
|
