Bolt size for 4 factory holes in rear bumper? What's supposed to be there? (1 Viewer)

[whosthecoolguy]

I have an '91 HDJ81, it has the four hole pattern on the rear bumper. I took a closer look at the holes today and noticed the top 2 are threaded.

Does anyone know what size bolt the holes take? Also, what are the 4 holes for? I was thinking of putting a pintle hook there for recovery, will that hold? What is supposed to be there?

Thanks guys,

 

[jon@svwbarchitects.c]

Tehy are 12 mm X 1.25 thread.

 

[Beowulf]

What is supposed to be there?

The holes are for a pintle. This is mentioned in the Newbie guide in the FAQ.

-B-

 

[whosthecoolguy]

I must have missed this when I searched...and I still can't find it, do you have a link?

The holes are for a pintle. This is mentioned in the Newbie guide in the FAQ.

-B-

 

[whosthecoolguy]

Thanks!

Tehy are 12 mm X 1.25 thread.

 

[d0ubledown]

pintle mounting. seen them lots on HDJ81's. not really rated for heavy duty towing though...

 

[whosthecoolguy]

I don't think I would ever tow with it, maybe something light but I thought maybe as a recovery point?

 

[Bikeman]

MAF makes a 2" receiver that will bolt up to that pattern. I had one for bike rack use and light towing.

 

[landcrusher80]

Jeff,

Have no trouble towing with it. I think almost everyone outside of North America use them.

 

[Tackelbarry]

Any idea where I can buy one? Thanks Scott

 

[whosthecoolguy]

Picked mine up at a local surplus store (Princess Auto). I would look in your yellow pages for a store that deals with hitches.

 

[Bear80]

unless it's only for a small 350kg camping or utility trailer....

 

[98 SNAKE EATER]

Jeff,

Have no trouble towing with it. I think almost everyone outside of North America use them.

I have no trouble towing with mine either

 

[whosthecoolguy]

Snake Eater,
Looks good! Anything special you did to mount it? reinforcing? Looks good, what do you figure the weight of the trailer and seadoos is?

Jeff

 

[Beowulf]

I must have missed this when I searched...and I still can't find it, do you have a link?

Post #3 in the FAQ.

IH8MUD.com Forum - View Single Post - FAQ for 80/LX450 - February 26, 2008- Added IronYuppy's body lift review

-B-

 

[whosthecoolguy]

Still not seeing it?

Post #3 in the FAQ.

IH8MUD.com Forum - View Single Post - FAQ for 80/LX450 - February 26, 2008- Added IronYuppy's body lift review

-B-

 

[Beowulf]

The holes are for a pintle. This is mentioned in the Newbie guide in the FAQ.

-B-

Jeff,
It is in the Newbie guide on the Slee Off-Road web site which is the 1st linked item in post #3 of the FAQ here in the 80-Section. Open the Newbie guide and read down to section 2.6

2.6 What are those 4 holes on the back bumper

Firstly, the black piece with the 4 holes (covered on Lexus LX450's) is not actually the bumper but the rear cross member of the frame. The 4 bolt holes are another point of great debate. These were put there by Toyota for attaching a pintle hook or towing ball. However in the US these are not rated for towing, and it is recommended to use a factory or aftermarket receiver hitch that bolts securely to the frame.

-B-

 

[whosthecoolguy]

Found it

Thanks for leading the horse to water. There was so much stuff I couldn't find it.
Thanks!
Jeff

Jeff,
It is in the Newbie guide on the Slee Off-Road web site which is the 1st linked item in post #3 of the FAQ here in the 80-Section. Open the Newbie guide and read down to section 2.6

2.6 What are those 4 holes on the back bumper

Firstly, the black piece with the 4 holes (covered on Lexus LX450's) is not actually the bumper but the rear cross member of the frame. The 4 bolt holes are another point of great debate. These were put there by Toyota for attaching a pintle hook or towing ball. However in the US these are not rated for towing, and it is recommended to use a factory or aftermarket receiver hitch that bolts securely to the frame.

-B-

 

[Beowulf]

Found it

Thanks for leading the horse to water. There was so much stuff I couldn't find it.
Thanks!
Jeff

No problem. We have a lot of information in the FAQ and the volume has reached a point where improved organization would help people find things. For now, those that are familiar with where things can be found will have to help those that are struggling with finding things.

Now you can jump in and give guys a pointer when someone needs information that is covered in the Newbie guide.

-B-

 

[robmir]

Snake Eater,
Looks good! Anything special you did to mount it? reinforcing? Looks good, what do you figure the weight of the trailer and seadoos is?

Jeff

Jeff: I have been there, and after several long trips I will explain what I did.

Before installing my aux tank I had the standard town hitch and a 500 lbs cargo carrier to carry about 15 gal of gasoline as to extend my range, bad idea because the cargo carrier affected my departing angle and the carrier hit every where.

For the next trip, I removed the town hitch and bolted a 2" receiver to the 4 hole and hooked again the same cargo carrier with the same weight in gas cans and guess what happened after I arrived to my destination: the cross member face were the receiver were bolted twisted a bit and the cargo carrier was not parallel with the floor so it was clear that the 4 bolt was only designed to pull a load in line but not to hold a large tongue weight. When I returned from the trip I inserted a 2" solid bar in the receiver and lifted the cruiser from the bar with a jack as to fix the cross member.

Once I got my aux tank and my rear TJM bar and tire carrier I decided it was time to reinforce the 4 bolt area to stand a large tongue weight before mounting the rear bar.

The aux tank holding brackets limited my options but I still managed to add braces welded to a steel plate between the cross member and the TJM bull bar to relay the load to the frame were the stock hitch were bolted. Also I did a new 2" hitch receiver with the square tube welded to a bigger plate and added 2 additional grade 8 bolts in the upper side. Inside the cross member I removed the 2 OEM cross member welded nuts and inserted a new reinforcing plate with the new 4 nuts welded on it following the OEM pattern plus the 2 additional nuts also welded to this reinforcing plate. The idea was to spread the torque transmitted by the load to a wider area limiting the flexing of the rear cross member through the reinforcing inside inserted plate.

Then to test how well the system worked, I lifted a bit the body and set a couple of jacks on the corners of the rear frame, then lowered the body until it rested on the jacks as to avoid any body movement and hooked again the 500 lbs cargo carrier with a couple of heavy buddies standing on the carrier and ask them to jump on it many times as to force the cross member to flex and simulate what I should encounter on a bumpy road: there were not any noticeable movement of the cargo carrier or cross member flexing. I guess this couple of friends "tongue" weight were well over the 250 lbs limit I set on my design.

I know is not a very precise technical measure test and of course is not a DOT approved accessory but lo and behold it passed well my crude test

Of course after I added the aux gas tank I never really needed to carry extra gas again and load more than 100 pounds on the cargo carrier but is good to know it can handle a lot more.

Another reason I had to reinforce the OEM 4 bolt cross member location was because I got a Warn 8000 lbs removable winch with it's own fast connectors just in case, and I had to be sure the cross member bolted receiver can stand the big pulling load a winch hooked on it could transmit.