Rear diff drain

[efnfast]

Any down side to drilling and plugging the rear diff for fluid changes?
Anybody crack one?? Oh the horror.

[Scrrem]

I used the drill and tap kit from Corvette Central, worked great, no issues.
Rich

[Dynomite]

Any down side to drilling and plugging the rear diff for fluid changes?
Anybody crack one?? Oh the horror.

No Issues at all.........crack one?....are you kidding? :p


See item #4 LT5 Added Systems (http://forums.corvetteforum.com/c4-zr-1-discussion/3005470-tech-info-lt5-modifications-rebuild-tricks-500-hp-8.html#post1587644226)
Original Photos provided by Scrrem with Red notes added :handshak:
Thank You Rich :thumbsup:

It is worthwhile to do if for no other reason you get a complete drain of the original Differential Fluid :cheers:

[efnfast]

Thanks Cliff, I've got all that stuff at home.

[RussMcB]

I wonder why it didn't come with a drain.

I added one via the kit a while back. I don't remember it being easy, but certainly not a big job.

The "official" kit comes with a template to help you drill in the right location.

[Shrek]

Here's one I did using a pipe plug

http://i446.photobucket.com/albums/qq186/2manyvettes24/96/96%20Rebuild/Dana44003_zps6ab90d23.jpg

http://i446.photobucket.com/albums/qq186/2manyvettes24/96/96%20Rebuild/Dana44003A_zpscfe868f1.jpg

[Dynomite]

This location of the drain plug is at the Lowest point inside the Differential :thumbsup:

Original Photos provided by Scrrem with Red notes added :handshak:
Thank You Rich :thumbsup:

https://cimg7.ibsrv.net/gimg/www.corvetteforum.com-vbulletin/400x400-1/80-diffcasedraintap3_1__e8ead9db5d0b81f65d93eef60ed4e 04dff138525.jpghttps://cimg8.ibsrv.net/gimg/www.corvetteforum.com-vbulletin/400x400-1/80-diffcasedraintap2_1__80fe8b40bc515a2b0dae3745f74d8 20ddf7cd22a.jpg

See item #4 LT5 Added Systems (http://forums.corvetteforum.com/c4-zr-1-discussion/3005470-tech-info-lt5-modifications-rebuild-tricks-500-hp-8.html#post1587644226)

[efnfast]

Now if I could just fine those 1/8" anodized plugs I bought when I did my plenum......

[Dynomite]

Now if I could just fine those 1/8" anodized plugs I bought when I did my plenum......

1/8 inch Aluminum Allen Head NPT pipe plugs (http://www.summitracing.com/parts/sum-g1485r)

See item #4 LT5 Added Systems (http://forums.corvetteforum.com/c4-zr-1-discussion/3005470-tech-info-lt5-modifications-rebuild-tricks-500-hp-8.html#post1587644226)

[efnfast]

I think I have some around here. If not, I probably have a regular SS one's at work

[Paul Workman]

FWIW, I put a wrap of Teflon plumbers tape on the plug to keep it from seizing.

[efnfast]

Thanks for all the input. It's on my list of things to do.

[WARP TEN]

Marc H does these regularly and might have tips for you if you give him a call. --Bob

[jss06c6]

Simple job, makes fluid change a breeze..

Sent from my XT1585 using ZR-1 Net Registry mobile app (http://r.tapatalk.com/byo?rid=90383)

[efnfast]

Severe duty, every 50,000. How often so you guys change it?

[RussMcB]

Severe duty, every 50,000. How often so you guys change it?Not often, but it was a little peace of mind to drain it and put in new, known fluid.

[efnfast]

Done.

[Hib Halverson]

When I owned my 95, right after I first met Marc H., he told me about drilling the back of the drive axle housing for a drain plug. I think the exact measurements for the positioning of the hole are on his web site.

Never worried about chips because they all came out with the old lube.

In that car, like all my other drive axles, I used Red Line Heavy Shockproof Gear Lubricant.

I'd change it ever 36,000-40,000 miles or every 3-4 years.

[efnfast]

Filled it with Amsoil 75W-90 with a little friction modifier. Pretty pleased with the results.

[TX '90 ZR1]

I am changing my fluids in the next few days. Might as well do the diff. drain while I am there.
Does anyone have the exact placement of the plug in the housing? I have the drill & tap so don't really need to order the kit. Also, checked Marc's site, but was unable to find the info if it is there.
Thanks in advance.

[efnfast]

Cruz up this thread, there are some pretty good pictures of the inside of the diff. I used them for reference before I drilled.