Feasibility of U1200 frame stretch.

MOGMAN64

New member
Good morning I was hoping to get some feedback on the possibility of stretching a U1200.

Lets get to the bones. The truck is an 88. Om352A. I can push it to 170hp with some IP injection work.

Also, the truck is a Snowblower. 24 speed tranny. Once that is removed. I have a 1200 with 1600 running gear which gives it the big boy disc brakes, axles, suspension(weighs in at 23,000+lbs), and Level 4 suspension upgrade stock.

So the stock frame is 1/2" thick. 6.5" outer web with 5.5" inner web.

My thinking is to stretch it. Max length 4900mm.

Since a 1300L is 3250mm and the Lwb are 3700mm and 3800mm. That be minimum.

So where would I source the frame rail? I checked with the local steel supplier.

I have the European Frame manual for shortening or lengthening a frame. Need to do a work up.

Anywhere be appreciated. I realize many people would say...why not find a longer Mog to start with. Although not entirely out of the picture this is ...

Is It Possible. Cost. MFG specs.

Other things to consider.

Torque Tube Lengthening.
Drive line lengthening.
Torque tube supports.
Brake lines.
Wiring
 

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Iain_U1250

Explorer
Anthing is doable if you have enoug money, you are basically rebuilding most of the truck. The geometry of the frame needs to be sorted out first.

You have one of these:

Screenshot 2022-04-06 082405.jpg

My U1250 looks like this

Screenshot 2022-04-06 082740.jpg

A U1300/L37 looks like this (I don't have a better copy unfortunately). You can see the extra cross members in the L37, and where MB did the lengthening. The frame is also wider and made of a bigger C sections

Screenshot 2022-04-06 083549.jpg

Here are links to the body builder handbook for a U3000/4000/5000.


 

MogsAndDogs

Member
Anthing is doable if you have enoug money, you are basically rebuilding most of the truck. The geometry of the frame needs to be sorted out first.

You have one of these:

View attachment 715913

My U1250 looks like this

View attachment 715914

A U1300/L37 looks like this (I don't have a better copy unfortunately). You can see the extra cross members in the L37, and where MB did the lengthening. The frame is also wider and made of a bigger C sections

View attachment 715916

Here are links to the body builder handbook for a U3000/4000/5000.


Interesting how different the frames are. Not just a case of making the back of it longer - the whole thing is engineered differently. Do you know where you found the U1300L37 diagram?
 

MOGMAN64

New member
Here are the two Vins associated with my truck.

Thanks for all your input. Keep it coming. This is a feasibility study.
 

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MOGMAN64

New member
I happened to run across this from Australia.
 

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