4” BDS shim holes & center pin - JeepForum.com
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  • 2 Post By oldschool74cj5
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post #1 of 8 Old 04-11-2021, 10:28 AM Thread Starter
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1983 CJ7 
Join Date: Dec 2010
Location: Dallas
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4” BDS shim holes & center pin

Hey everyone. I’m installing a 4” BDS lift on my 83 CJ7. I have two issues:

1. The center pin seems too short to fit through both the shim and the axle mount holes. Picture attached. Dumb question, but can I buy new center pins to the length needed? Or will I need to cut them to size and re-thread?

2. The BDS center pins provided don’t even fit into holes in the 4 degree shim that BDS provided. It doesn’t make sense. So I either need to buy with center pins that will fit or drill out the shim holes, correct?


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post #2 of 8 Old 04-11-2021, 10:36 AM
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1983 CJ7 
Join Date: Sep 2020
Location: New Braunfels
Posts: 371
Are those aluminum or steel shims? I would only use steel. Drilling them to fit bolt is fine. Couple ways to solve the bolt length issue. If you have a welder you can modify the ones you have by welding a nut or steel shaft on top and grind it round. Or you can just order new bolts with the size heads you require. My shims from Tom Woods came with new bolts.
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post #3 of 8 Old 04-11-2021, 12:14 PM
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1980 CJ5 
Join Date: May 2002
Location: Hawaii
Posts: 8,736
I used allen head bolts on my front axle since I was working on the Jeep on a Sunday and the parts stores were closed. Whatever you use, be sure the heads don't bottom out on the axle tube and keep the spring pad from sitting properly on the shim.
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post #4 of 8 Old 04-11-2021, 01:05 PM
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1980 CJ5 
Join Date: Jun 2016
Location: Yuma
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Yep those are AL shims. I had the same shims in my kit from BDS. I ordered steel shims and pins from Rustys Offroad. Eventually you will pound out those shims. If you use them don't drill them out, use the new pins that came in the kit. They should be threaded through the shim.
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post #5 of 8 Old 04-11-2021, 01:13 PM
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1934 CJ7 
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Location: Orange City
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Napa probably has them, thatís where I got mine. When I had a similar problem putting my BDS kit on.

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post #6 of 8 Old 04-11-2021, 05:11 PM
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1984 CJ7 
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Location: Lancaster CA
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WFO is where I buy my shims...they seem to be the most affordable steel shims I can find. They sell the center pins as well.

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post #7 of 8 Old 04-11-2021, 06:11 PM
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you want steel shims. also when i have installed shims i clamped the spring removed the center bolt and the bolt goes through the shim then the springs. that clamps the shim to the springs so it cant move then the head of the pin goes only through the axle hanger.
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post #8 of 8 Old 04-12-2021, 08:09 AM
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1985 CJ7 
Join Date: Sep 2017
Location: Lehigh Valley
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You have to install new spring pack bolts with the shim as part of the spring pack. Shims should come with new (longer) spring pack bolts. Plus ditch the aluminum for steel.
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1985 CJ7- 4.5" BDS/Fiberglass Tub/33s/Many Mods
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