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Old 06-05-2013, 04:57 PM
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Back seat mod

I'm getting ready to shim the back seat of my 07JKUR. How high do you all suggest and will I need to replace the bolts as well?

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Old 06-05-2013, 05:09 PM   #2
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curious - why do you need to raise the seat?

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Old 06-05-2013, 05:18 PM   #3
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I like the other backseat mod better. The one where the backseat stays in the garage.
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Old 06-05-2013, 05:19 PM   #4
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Originally Posted by enjerhoo View Post
curious - why do you need to raise the seat?
I think he's shimming beneath the front posts to tilt the rear seat backwards and make it a little more comfortable. I'm told it helps.
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Old 06-05-2013, 05:28 PM   #5
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I like the other backseat mod better. The one where the backseat stays in the garage.
Amen Brother! Especially on a 2 door.
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Old 06-05-2013, 06:33 PM   #6
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Old 06-05-2013, 06:51 PM   #7
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The first link you posted should only be used as an object lesson in exactly how not to do this mod. It's a recipe for absolute disaster, because he has removed and not replaced the rear seat bolts. He says that he's worried for the safety of his wife and child as a result, and he's right to be. In the event of a significant impact, the weight of a human working on the weakened front mounts (because of the spacers) with nothing holding the rear down are likely to turn the entire back seat and its occupants into a missile, crushing them and quite probably having a serious effect on the front seat occupants as well.

Please, no-one do this.
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Old 06-05-2013, 07:21 PM   #8
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i like the other backseat mod better. The one where the backseat stays in the garage.
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Old 08-26-2013, 10:12 AM   #9
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Shimmed the back seat...much better

Not that I ride back there but I do put 4 people in my 2012 JKU Sport S fairly often. So, reading threads from the other forums, I completed the rear bench sheet angle mod. I had a machinist friend make this for a case of microbrew.

Here are the measurements for the shims using 3/8" thick, 1.5" wide steel flat bar:
4 pieces
1.5" wide
2.75" long
One 1/2" hole drilled through each piece. The hole center should is 3/4" from both sides of the stock and 1" from the end.

3 pieces
1.5" wide
5"" long
One 1/2" hole drilled through each piece. The hole center should is 3/4" from both sides of the stock and 2.5" from the end.

The 4 shorter pieces go under the bench seat "feet" and the 3 longer ones get placed under the seat where is attaches to the tub.

You definitely need to loose the 3 nuts in the cargo area that hold the rear seat. It allows you to move the seat around to align the holes once the shims are on place.

Please be sure to read the other thread on the how-to steps. It's pretty straightforward and you'll need some elbow grease to initially break the bolts loose. I posted this to show the shims as I refined the measurements.
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Old 01-18-2014, 12:32 PM   #10
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Wow that looks great, any chance at getting those made ? Like forsale?

(Sorry I know this is an old thread)
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Old 01-18-2014, 01:07 PM   #11
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Wow that looks great, any chance at getting those made ? Like forsale?
Check out eBay user ( innovativejkproducts1) sells a set for about $60 (see link below)



Jeep JK Unlimited JKU 4 Door Rear Seat Recline Spacers | eBay
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Old 01-19-2014, 03:47 AM   #12
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Thank you!
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Old 01-20-2014, 10:59 AM   #13
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Originally Posted by Y-Guy View Post
Check out eBay user ( innovativejkproducts1) sells a set for about $60 (see link below)



Jeep JK Unlimited JKU 4 Door Rear Seat Recline Spacers | eBay
Bought this kit and installed it in my 2014 JK. Easy to install and does the job. Chrysler really missed the boat on the back seat comfort in the JK's. Stiff as a board, 90 deg angle sitting position and zero lateral support. Disappointing... PS-
I will be swapping out my front seats to the Mastercraft Baja RS seats next week and a cover for the rears.
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Old 05-17-2014, 04:19 PM   #14
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I did this yesterday. Found some 3/4"x1-1/2" and 3/8"x1-1/2" aluminum bar stock at a local metal supplier for $10. Fronts are 3/4"x1-1/2"x2-1/2" with hole 3/4" from one end. Backs are 3/8"x1-1/2"x4" with hole 1-1/2" from one end. Holes are 1/2" dia.






















This is how far a seat bolt sticks through the tub without shims.


This is the rear bolts with 3/8" shim. Still 100% threads engaged.



This is with the 3/4" shims at the forward seat legs. I measure slightly less than 1/2" thread embedment. Given the taper on the bolt that you can see 2 pictures above, it clearly doesn't have full engagement of threads in the weld nut. I may try to find longer bolts for those 4.



Final thoughts:
As many have said, breaking the bolts loose is tough. They're tight and have thread locker. $12.99 for 25" breaker bar from Harbor Freight makes it a reasonable job. Definitely a worthwhile mod. I don't ride back there but my teenagers do and it's definitely more comfortable.
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Old 05-17-2014, 06:41 PM   #15
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Nice write up. I'd look for longer bolts for the front. I was wondering if the bolts might be too short for this but it looks like it might be OK with just 3/8 inch spacers instead of the 3/4 inch spacer you used.
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Old 05-17-2014, 06:52 PM   #16
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Nice write up. I'd look for longer bolts for the front. I was wondering if the bolts might be too short for this but it looks like it might be OK with just 3/8 inch spacers instead of the 3/4 inch spacer you used.
Agree. 3/8 is fine but 3/4 is pushing it.
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Old 05-17-2014, 07:09 PM   #17
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Agree. 3/8 is fine but 3/4 is pushing it.
Any idea what size those bolts are? I found the metal online but I wonder if you can find those bolts at any common hardware store or if they are an uncommon size.
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Old 05-17-2014, 08:54 PM   #18
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Any idea what size those bolts are? I found the metal online but I wonder if you can find those bolts at any common hardware store or if they are an uncommon size.
I didn't measure the bolts. Only thing unusual about them is the tapered tip. I don't know if that's for self-tapping or what. I guess it would make removal easier after years of undercarriage exposure, but that may not be the purpose. If I end up removing one to measure I'll post up the size. Please do the same if you get to it first.


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Old 06-05-2014, 10:49 PM   #19
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These people seemed to have a good product and you don't have to completely remove the seat bolts: 07 14 Jeep Wrangler Unlimited Rear Seat Recline Spacer Kit 08 09 10 11 12 13 | eBay
Interesting concept but having just done this mod I would say not fully removing the bolts is of minimal value, IMO. Might save a couple minutes of turning a wrench. I don't think I would want to try to break the back bolts without fully removing the fronts and folding the seats up. To be fair though, there's no reason you can't use this kit and fully remove the front bolts.
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Old 02-17-2015, 11:41 PM   #20
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Did this mod today, what a difference 3/4" spacer made. Thanks to cc4005 for your pictures, I did the spacer the exact same as yours. They were easy to make, and was under $10 in scrap aluminum.

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