PDA

View Full Version : New Bumper....



robselina
09-11-2004, 08:34 PM
I put this in my jeep journal, but thought I'd share it here too....

I made a rear bumper today. Its only temporary, so I made the mounting system modular and super beefy, so I could just bolt on another design down the line. I want something that will wrap around, but I don't have time to make that right now so this will keep me from smacking my back end on every obstacle (used to have a hitch for a tow point)

Anyway, here's the mount:

http://www.nmt.edu/~rselina/zjbumper1.JPG

The passenger side 2" tube is 12" long, the drivers side is 10" long to clear the fuel lines. The 2" square tubing is 1/4" thick, it's connected by 1/4" thick 2" angle iron and then the tabs on the end of the 2" square stock are made of 3/16" thick 2" flat bar. I didn't brace them on purpose 'cause I want them to have some give....I tapped the 2" square stock so it would take 3/8" fine thread bolts (24 threads per inch). The 2" angle iron is connected to the body in 6 points with 7/16" grade 8 hardware.

http://www.nmt.edu/~rselina/zjbumper2.JPG

Here are finished pics. The 7/16" grade 8 bolts holding the bumper to the mounts have a couple neoprene fender washers between the bumper and mounts, again for a little give. I wanted a little play in the system so I wouldn't put too much stress on the mounts to the body, since that's definitely the weak link in it all.


http://www.nmt.edu/~rselina/zjbumper3.JPG


http://www.nmt.edu/~rselina/zjbumper4.JPG


PS - thanks to Brentt for letting me pick his brain about how he mounted his bumper....

Alaska ZJ
09-11-2004, 08:48 PM
Holy shit that looks familiar.....Looks good man.

BigDaveZJ
09-12-2004, 01:44 AM
Beefy and simple, I like it!

Moabrox
09-12-2004, 05:56 PM
Wow I like how it ties into each other. Probably strengthens the unibods well.

robselina
09-12-2004, 08:05 PM
Wow I like how it ties into each other. Probably strengthens the unibods well.

that's what I was shooting for. I think this removes a lot of the stress involved with the two single 2" square stock mounts, and it also offers some additional tie ins to the unibody....anyway, tried it out today, worked great getting slammed on rocks. Doesn't look tweaked or anything and it took the hits well (though there were a lot less hits than the last time I ran this trail I might add).

Wish I could say my rocker protection did so well though! It took a couple of hard hits on the passenger side, then on a pretty hard fall, it yanked the metal screws holding it in place out and forced the rocker protection into the body :x :? Anyway, I remounted it temporarily and reshaped the fender and door so they'd at least clear each other again:

http://www.nmt.edu/~rselina/zjdamage.JPG

I need to go ahead and just weld these things on. I'm going to try to get that out of the way tomorrow, though I am VERY tempted to just cut out the rockers and weld in some 2x4 that I have sitting in the shed.....

nmzj
09-13-2004, 12:13 PM
Rob, if you want to see what's behind the rockers, mine are trimmed, but I havn't welded anything on yet. You could come by and look at it if you're in Abq. soon.

Jason

JeepinHank
09-13-2004, 01:01 PM
Rob, if you want to see what's behind the rockers, mine are trimmed, but I havn't welded anything on yet. You could come by and look at it if you're in Abq. soon.

Jason

C'mon man! Share the love! Snap a couple of pics of that and post `em up. That would be something nice to have whenever I get around to cutting out my rockers, and I'm sure there are plenty of others who could use it. If you don't have the space, let me know, and i'll host them for you.

JH

robselina
09-13-2004, 01:40 PM
Jason - thanks for the offer. I'm going to be in town on Saturday, not sure if that's soon enough for you. If you could snap a couple of pics though that would be great 8)

Thanks,
Rob

Alaska ZJ
09-13-2004, 02:48 PM
http://www.akextreme4x4.com/images/tech/rocker/rockers1.jpg

http://www.akextreme4x4.com/tech/rocker/rockerpanelreplacement.htm

Have a look.

robselina
09-13-2004, 03:30 PM
cool, thanks for the info Brentt. This settles it for me, I'm just going to weld the fawkers onto the existing rocker.....

gearhead313
09-13-2004, 04:48 PM
that was definitly more detail that i expected on teh rocker install. VERY nice! I dont know if i'll go that indepth with mine. I think im going to take like 3/16's wall box and tack it in.

Alaska ZJ
09-13-2004, 06:01 PM
I was bored at the time. If I did it again I would just put a piece of 2x4 in there and call it a day.

zjnick
09-20-2004, 06:04 PM
Add a tire carrier and that thing would be awesome . . . i like the design

robselina
09-20-2004, 06:40 PM
Add a tire carrier and that thing would be awesome . . . i like the design

thanks, that's the eventual intention. My wife hates keeping the spare in the back (she likes the space), so I throw it on the roof for her, but I hate wheelin' with it up there, so I pull it down for wheelin....it's getting old :D