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Unread 05-03-2010, 07:27 PM   #1
parkerm26
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Fixing Rotted Out Skid Plate Mounts

So after i blew a ujoint, and had my JB Conversions SYE ordered (the u joint didnt last long enough), i decided to remove the tcase cuz thats the way my friend wanted it to do the SYE. with a friend i could practiaclly rip all the skid plate bolts out of the frame. so it was time for remaking the bottom of the frame rail. This is the frame after removing the skid

Drivers Side:


Passenger Side:


Damage to Pinion (not a big deal) What are those little "bridges" called? and how much they are?


i welded in the new pieces today. They were 27 inches long. 2.5 inches wide. 1/8 in thick cold rolled steel. The holes are 5/8 inch diameter in the center of the strip. the holes are 9 3/16 and 8 3/16 apart on center. on one side i welded 1/2in (3/4in socket) Grade 8 nuts with the holes centered so bolts could easily fit through. both are identical. i drew a sketch cause i forgot to take pictures of the pieces but my mac wont let me upload it to image shack. PM me your email if you want the sketch. more pics to come tomorrow of the finished job. forgot to take pics today i was too tired and covered in burns from welding, grinding, cutting, etc. it sucked. The bolts im using to hold the skid plate up are 1/2in x 2in grade 8. i hope theyre long enough with an 1/8in washer. havent test fitted the skid because its here at my house and the jeep is down the street at a friends shop and needs towing. More pics tomorrow night!

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Unread 05-03-2010, 08:30 PM   #2
Area.3.Fiftyone
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If you welded the nuts to the plate, they are no longer grade 8. The heat from welding them reduces their hardness.

You can get a U Joint strap kit at just about any good auto parts store. It will come with new bolts and straps.
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Unread 05-04-2010, 06:04 AM   #3
parkerm26
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Yeah thats what the engineer said who helped me. better starting with grade 8 that something else i would assume. idk if stainless would have been better. but the bolts are grade 8 and thats where i really need strength. thanks for the info on the straps
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Unread 05-04-2010, 11:48 AM   #4
Area.3.Fiftyone
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No problem.

Grade 8 bolts are only better for applications that require more shear strength any way. Those skid plate bolts are in tension, so it really doesn't matter.
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Unread 05-04-2010, 03:00 PM   #5
parkerm26
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cool thanks
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Unread 05-04-2010, 03:06 PM   #6
littlejohn411
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That frame looks just like mine.

I am using these for the repair http://www.quadratec.com/products/56011_9050_07.htm

If you can post some pics of what you did to fix yours.

Also here is the strap kit you need if you can't find it locally http://www.quadratec.com/products/52303_00.htm
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Last edited by littlejohn411; 05-04-2010 at 03:14 PM.. Reason: More info
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Unread 05-04-2010, 05:44 PM   #7
notmyj
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Quote:
Originally Posted by IronMaiden View Post
No problem.

Grade 8 bolts are only better for applications that require more shear strength any way. Those skid plate bolts are in tension, so it really doesn't matter.
Untill your dragging it across a rock and it catches on a lip. Then its in a shear load. Lol

That being said, I used stainless button head bolts to hold my UCF skid on.
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Unread 05-04-2010, 06:24 PM   #8
NHfireYJ
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looking forward to intermediate and completed pics..
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Unread 05-04-2010, 07:56 PM   #9
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I did the exact same thing to fix mine. I have pictures but I'm too ashamed to post them because my welding looks horrible (but effective).
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Unread 05-05-2010, 08:15 AM   #10
parkerm26
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yeah my welding is horrible. i havent been down to see it yet since i did the job but i'll get the pics up asap
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Unread 05-07-2010, 12:35 PM   #11
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Quote:
Originally Posted by littlejohn411 View Post

Just found this thread in a search..

I have a bud's 88 YJ in driveway, just finished the lift with the exception of the transfer lowering kit. On drivers side the formost bolt is gone.. and the rearmost just spins. I'm expecting it's rotted above the skidplate.

I just called Q'Tech about this part and they tell me it's a 4 sided piece.. meaning it cant simply be slid over the framerail and welded. Is this true?

I'm hoping that it's slightly wider than the frame and i can cut the top portion out and weld this in? Anyone have any experience with this piece?
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Unread 05-07-2010, 01:49 PM   #12
parkerm26
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you do not want a "u" shaped replacement piece. this will just make your problem reoccur by trapping water. drilling drain holes is an option i guess. i did it this wat and only welded some parts. by doing this water can drain and excess water can evaporate.

and sorry these are cell phone picks thats why they suck

here is looking back from the front tire under the drivers side.



Same angle only the back portion of the new piece


and a look at my terrible welding and grinding. if you do this wear long sleeves, pants, and do it on a cool day so you can have something on your neck and face. hot metal burns suck


and done. with the frame anyway. still have to put the trans case back in with my new JB super short SYE installed, put the skid back up, and have the cherokee driveshaft cut and balanced. also doing front driveshaft u joints while im taking stuff apart. i'm thinking about cutting my cat out because i was told by the mechanic who did my SYE that i don't need it (cuz its a 93)and it might fall apart inside. any opinions? i'm not worried about the noise i'm an 18 year old kid hahaha just input from anyone that does not have a cat
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Unread 05-07-2010, 01:50 PM   #13
parkerm26
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why the pictures so small? i have no clue. they should be the same size as the first ones. ill try to fix that later. click on them for a better view sorry
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Last edited by parkerm26; 05-07-2010 at 01:50 PM.. Reason: forgot something
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Unread 05-07-2010, 04:31 PM   #14
littlejohn411
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Quote:
Originally Posted by ExpeditionXJ View Post
Just found this thread in a search..

I have a bud's 88 YJ in driveway, just finished the lift with the exception of the transfer lowering kit. On drivers side the formost bolt is gone.. and the rearmost just spins. I'm expecting it's rotted above the skidplate.

I just called Q'Tech about this part and they tell me it's a 4 sided piece.. meaning it cant simply be slid over the framerail and welded. Is this true?

I'm hoping that it's slightly wider than the frame and i can cut the top portion out and weld this in? Anyone have any experience with this piece?
Quadratec is wrong,they are caps and slide right over the frame.

You need to notch the body mount to slide the cap all the way up then weld it all up.
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Unread 05-07-2010, 05:48 PM   #15
Petrucci
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I just cut some angle iron to fit, drilled the skid plate bolt holes. Then tack welded the nut to the inside of the angle. I belive it was 3"-2" 1/4" angle and I welded it up solid to the frame. I Noticed a huge differance the jeeps alot more solid. But I also did the front steering box, and the rear shackle area frame repairs.....still a few more "weak" spots as well..lol
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