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01-23-06, 08:38 AM
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#1 | | Addict
Join Date: Jan 2005 Location: Louisville, KY
Posts: 1,098
| Spare Tire Modifications In preparation for my Slee rear bumper without a tire carrier, I crawled under the 100 this week end to look at the current spare mount. I was looking at what it would take to get the spare higher up under the 100. There are three areas that need to be addressed.
The first area is the front rail that pushes against the tire. It is mounted to the cross member in front of the spare tire. This was simple. I unbolted it and flipped it over and bolted it back on. It didn’t really matter much though as the tire rests against the cross member now and doesn’t hit the rail. The cross member is smooth so I don’t expect it to damage the spare any more than the rail would. |
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01-23-06, 08:40 AM
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#2 | | Addict
Join Date: Jan 2005 Location: Louisville, KY
Posts: 1,098
| The second step is to address the rear bar that the tire rests against. This was also simple. This bar just needs to be tilted upwards on its existing mounts to gain the clearance you need. (Pic 1) To do this, I took off the 4 bolts that hold it on. I then took a drill and wallowed out the top holes so the bolts had more room when the mount pivoted. (Pic 2) Then I added three washers in between the frame and the mounting flange on each of the bottom two bolts. These washers act as a shim. (Pic 3) Then add the top bolts and tighten everything down. This will pivot the bar upward almost touching the body of the 100. |
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01-23-06, 08:41 AM
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#3 | | Addict
Join Date: Jan 2005 Location: Louisville, KY
Posts: 1,098
| The last area to deal with is the cross member that holds the spare tire winch. It is held on with 2 bolts on each side. (Pic 1) Remove the 4 bolts and leave the cross member lying on the mounting bracket. Next, you must create some 1 ½ inch spacers. I used a steel half inch pipe and cut into 4 sections. I then filed down the rough edges and primed and painted them. Then I added the spacers in between the cross member and the mounting bracket. I used new 8mm x 1.25 x 60 mm hex head bolts to secure the cross member. (Pic 2) |
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01-23-06, 08:42 AM
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#4 | | Addict
Join Date: Jan 2005 Location: Louisville, KY
Posts: 1,098
| These three modifications allowed me to raise the tire further up in the spare tire well. It moved the front of the tire up another inch and allowed the rear to go up another 1 ½ inches. Overall, I am really happy with the new height. Between the narrower size of the 255x85 spare tire and these modifications, the spare hangs down over two inches less than before. This will definitely help with clearance as I plan to keep the tire under there after the Slee bumper is fitted to the 100. Here are a couple final pics of the spare after the modifications are done. |
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01-23-06, 09:21 AM
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#5 | | Lifer
Join Date: Dec 2003 Location: Bay Area, CA
Posts: 6,457
| Great write-up. I thought about doing the same thing but abandoned the idea when I couldn't find a suitable 35x9.5-16 tire. 255/85-16 is much easier to find.
__________________ 98 LX470
85 BJ70
09 KK SportsRV |
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01-23-06, 09:47 AM
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#6 | | Lifer
Join Date: Jun 2004 Location: Brooklyn, NY, Edgartown, MA
Posts: 4,049
| That looks great, and simple. Nice job. May consider doing that when I get my new rear bumper on.
__________________ 1981 FJ60 - 210K, OME, 33" BFG ATs, Surco Safari Roof Rack with custom Rod Racks, MAF header, Flowmaster Super 44 muffler. 2002 UZJ100 - 50K, OME 865, OME T-Bars, Slee Diff Drop, TJM T-15 AL, TJM RB8, TJM Rear Tyre Carrier, Toyo OC ATs, Warn Winch, AO Roof Rack, IPF 900s, PIAA 520s and 510s, Borla CAT back with SLP muffler. Gotham City Land Cruisers Yankee Toys Bay to Blue Ridge Cruisers |
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01-23-06, 09:52 AM
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#7 | | Addict
Join Date: Feb 2004 Location: Left Coast, USA
Posts: 2,327
| Nice job Greg! I'd be all over this mod, if I didn't plan on sticking an OEM subtank up above the spare...
__________________ Derek Lee `81 G-Wagen (460.333), `04 Land Cruiser (UZJ100)...plus some other junk... |
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01-23-06, 09:52 AM
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#8 | | 250+ Club
Join Date: Oct 2004 Location: Bay Area
Posts: 598
| Hey Greg,
Very nice idea and write-up. I only have a 285/75R16 Nitto spare but I would still like to get more ground clearance since I don't and probably won't add a swingout rear tire carrier. I will be doing this soon too. Thanks for the post.
Re: Raising the crossmember-
1. I know that doesn't really add much strength especially compared to the already stout frame on the 100. But, I'm wary of the idea of using SS tubing for a spacer. That doesn't look very strong to me. I'd opt for a block of steel joining the two holes if possible. Like I said, I doubt it adds that much strength anyways and probably isn't a big deal.
__________________
2000 UZJ100 "Grey Ghost" - Outback Rack, Sliders, 285 Nitto Terra Grapplers, Norcal 80s Sticker
2010 Tear Drop Trailer - Next Project |
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01-23-06, 09:55 AM
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#9 | | 250+ Club
Join Date: Oct 2004 Location: Bay Area
Posts: 598
| One more thing-
How does raising the tire up affect the way the tire is loaded/unloaded with the little winch and extension bar for raising/lowering it? Does it still engage without rubbing?
Thx!
__________________
2000 UZJ100 "Grey Ghost" - Outback Rack, Sliders, 285 Nitto Terra Grapplers, Norcal 80s Sticker
2010 Tear Drop Trailer - Next Project |
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01-23-06, 09:57 AM
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#10 | | Addict
Join Date: Feb 2005
Posts: 1,082
| Nice job stuffing that tire up in there...you can barely see it now from the rear !
You will love that new bumper !
__________________ 2000 UZJ100 OME 2" HD lift + "L" shocks, 305/70/16 Toyo MT`s , Slee diff drop, ARB front Bull-bar,Slee rear w/carrier, Custom exhaust, AO roof rack and drawer system, Various custom dents and scratches.... |
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01-23-06, 10:17 AM
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#11 | | Lifer
Join Date: Dec 2003 Location: Bay Area, CA
Posts: 6,457
| Quote: |
Originally Posted by rockclmbr 1. I know that doesn't really add much strength especially compared to the already stout frame on the 100. But, I'm wary of the idea of using SS tubing for a spacer. That doesn't look very strong to me. I'd opt for a block of steel joining the two holes if possible. | They've been doing a similiar mod to this on the FZJ80's for a long time. Some people have even used a stack of washers as spacers. But a block would be nicer.
__________________ 98 LX470
85 BJ70
09 KK SportsRV |
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01-23-06, 10:21 AM
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#12 | | 10k Club
Join Date: Mar 2003 Location: PNW
Posts: 12,706
| yup, great mod, did it on my 80 many many moons ago, hadn't checked the 100 to see if it was the same, looks close enough, thanks Quote: |
Originally Posted by hoser They've been doing a similiar mod to this on the FZJ80's for a long time. Some people have even used a stack of washers as spacers. But a block would be nicer. |
__________________ Truth is a torch that shines through the fog without dispelling it. Always be true to your work, your word, & your friends, & you will never live a day without peace |
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01-23-06, 10:59 AM
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#13 | | Addict
Join Date: Jan 2005 Location: Louisville, KY
Posts: 1,098
| Quote: |
Originally Posted by rockclmbr Hey Greg,
Very nice idea and write-up. I only have a 285/75R16 Nitto spare but I would still like to get more ground clearance since I don't and probably won't add a swingout rear tire carrier. I will be doing this soon too. Thanks for the post.
Re: Raising the crossmember-
1. I know that doesn't really add much strength especially compared to the already stout frame on the 100. But, I'm wary of the idea of using SS tubing for a spacer. That doesn't look very strong to me. I'd opt for a block of steel joining the two holes if possible. Like I said, I doubt it adds that much strength anyways and probably isn't a big deal. | I used a pretty heavy pipe to make the spacers. There's no way they will collapse with the amount of weight they are holding. The brackets are thinner than the spacers, if too much weight gets put on them they would probably fail before the spacers. If you're really worried about it though, you could use blocks, spacers, washers, etc. I'll post back if it ever fails. |
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01-23-06, 11:03 AM
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#14 | | Addict
Join Date: Jan 2005 Location: Louisville, KY
Posts: 1,098
| Quote: |
Originally Posted by rockclmbr One more thing-
How does raising the tire up affect the way the tire is loaded/unloaded with the little winch and extension bar for raising/lowering it? Does it still engage without rubbing? | When you tilt the rear bar (Step 2) upwards, it will not be in the way of the winch. I can still put the crank bar through the bumper and it goes into the winch mouth just fine. If you went any higher though, you probably couldn't get the crank bar into the winch mouth through the stock bumper. |
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01-23-06, 01:54 PM
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#15 | | 250+ Club
Join Date: Nov 2005 Location: AJ - UAE
Posts: 395
| I have the SUB tank .. I think I cant do this mod .. thanks any way ..
__________________ FJ100 |
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01-23-06, 08:17 PM
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#16 | | Forum Regular
Join Date: Oct 2004 Location: Boston
Posts: 211
| Nice write-up. Great idea!
__________________ 2000 UZJ100
2004 allroad 2.7TT (Not your average station wagon)
1996 Jeep ZJ 5.2L (still in the family)
1994 Jeep ZJ 4.0L (also still in the family) |
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01-23-06, 09:02 PM
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#17 | | Lifer
Join Date: Nov 2003 Location: Socal
Posts: 4,254
| Gregb,
with the VSC you can't use a different size spare with the 4 larger tires. Is there a contingincy plan for this?
__________________ SC'd, Water intercool'd, HQ'd, Slee'd, Norcal80'd my wip I drink your milkshake! |
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01-23-06, 09:36 PM
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#18 | | Addict
Join Date: Feb 2004 Location: Left Coast, USA
Posts: 2,327
| Quote: |
Originally Posted by FirstToy Gregb,
with the VSC you can't use a different size spare with the 4 larger tires. Is there a contingincy plan for this? |
All that matters for the driveline is that the rolling diameters are the same, tire width doesn't really matter (yeah yeah, different rolling resistance and all that, but I don't see that making much of a difference in this scenario). Going purely by the "+ One" formula, his stock tire (I assume on a 16" wheel) is 33.4" in diameter. The 255, because of the higher aspect ratio of 85%, comes out to 33.1" in diameter. IMHO he should be fine to run this tire with only a 0.3" difference.
__________________ Derek Lee `81 G-Wagen (460.333), `04 Land Cruiser (UZJ100)...plus some other junk... |
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01-23-06, 09:42 PM
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#19 | | Lifer
Join Date: Nov 2003 Location: Socal
Posts: 4,254
| That's pretty close then, but maybe do a test run. (Remember that one guy who had his VSC kick in during higher speed turns b/c one rr tire was worn out)
but .3" sounds inconsequential. I thought it was a larger difference
__________________ SC'd, Water intercool'd, HQ'd, Slee'd, Norcal80'd my wip I drink your milkshake! |
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01-23-06, 09:55 PM
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#20 | | Addict
Join Date: Feb 2005
Posts: 1,082
| Quote: |
Originally Posted by dclee All that matters for the driveline is that the rolling diameters are the same, tire width doesn't really matter (yeah yeah, different rolling resistance and all that, but I don't see that making much of a difference in this scenario). Going purely by the "+ One" formula, his stock tire (I assume on a 16" wheel) is 33.4" in diameter. The 255, because of the higher aspect ratio of 85%, comes out to 33.1" in diameter. IMHO he should be fine to run this tire with only a 0.3" difference. | I agree with DCLEE (Hey, that kinda rhymes !)
The VSC will operate normally, even if one tire is MUCH lower in pressure than the rest..as long as it is within a "reasonable" diameter of the other 3 tires (dont know how much "reasonable" actually is) but it (VSC) seems to be pretty understanding, even when your running with one tire that is almost flat
__________________ 2000 UZJ100 OME 2" HD lift + "L" shocks, 305/70/16 Toyo MT`s , Slee diff drop, ARB front Bull-bar,Slee rear w/carrier, Custom exhaust, AO roof rack and drawer system, Various custom dents and scratches.... |
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