Is a 2wd truck and I dont know about the gear, but is the stock one.

Thanks amigo

 

I would load the truck backwards to see how much you can reduce the pin weight and possibly get the truck somewhat level. If that is not possible I would look for another truck with a standard transmission as you will have automatic transmission problems sooner than later using that one. You can get a LT265 75 16 ten ply tire that is rated to 34** lbs. in a single rear but you may need a dually in the end.

 

I don't understand why your truck is squatting that much. I've had over 4,600 lbs. of sand in the bed of my 2500 and it wasn't squatting anywhere near that much. You must have wet noodles for springs.

 

A CDL is a commercial drivers license, I did not see you live in Mexico or I would not have mentioned it because I do not know the laws down there. I still can't really agree with just trying to get that truck to work, you really need a bigger truck.

 

At 21000 gvw the 2500 will handle the load, dual wheels are easy to add to the truck, and if u cant import a heavier truck, by all means make the one u have as safe as possible. I use a 95 Dodge 2500 with dual wheels and a sleeper to pull a 48 ft low deck gooseneck 2 car hauler and have no problems with the automatic, also use a 96 Kodiak and a 3500 dodge 4x4, but the 2500 with duals seems to work just fine and its under the cdl rating here in the states with a GVWR of 8800 lbs.

 

get a tranny cooler and exhaust brake for sure stopping and driveline would be the main thing first to adddress then slight engine mods

 

BUT be careful having too much weight behind the trailer axles ,if it ever starts to whip around at hiway speed that trailer will eat that 2500 alive

 

Where can I find the parts? and what do I need to change? I know tha I need the rear dually axle, double wheels and tires, airbags, rear fenders, 4.11 gear, what else?

If I change the rear axle, do I need to do something to my tranny??

Thanks

 

Where can I find the tranny cooler??

 

Find a dually axle with 4.10's and LS, add air bags, get a diff cover (mag-hytec or similar), start saving for a built trans (goerend), trans temp guage, double deep trans pan, tc,vb, ex-brake with trans controler, really good brake controler, I'll add more when I think of it.
you can get a tranny cooler all over the internet, B&M, HUGHS, ebay etc.
Frank

 

I might even suggest shifting the axles on the trailer for better weight distribution if that is possible, there is way too much weight on there, let the trailer pack the load ( keeping moderate tongue weight ) I had 10,000 on the rear of my 2500 (with load and tongue weight) one trip and it scared the crap outta me! however with better distribution the truck handled it fine just too much tongue weight. airbags are great but what's the next weakest link?
with airbags I've had 4600 lbs of gravel in the back but thats not towing.

 

The most important stuff to do first is going to be brakes. Definitely add brakes to the third axle, as well as an exhaust brake. Also, when you do those (and any modifications you do for towing that much weight), do whatever it takes to make things as reliable as possible. You don't want your trailer brakes to fail at a critical moment because of a poor wiring connection somewhere. The other modifications are important, but not nearly as important as being able to stop that load.

You mention the truck is a 1999, which means it would have drum brakes in the rear. Get larger wheel cylinders for those drum brakes. I think one cheap and effective rear brake improvement is 30mm wheel cylinders for Chevy/GMC trucks. Also, if you have 2.5 inch wide brake shoes, buy new drums and 3" wide shoes. If you go with an axle from a dually, that will already have 3" wide shoes, but probably still has the same wheel cylinders that you already have, which I think are 27mm or something close.

For the transmission cooler and other improvements you should call one of the good transmission builders like DTT (http://www.dieseltrans.com), Goerend (http://www.goerend.com), or ATS (http://www.atsdiesel.com). I would think any one of them could help you build a really good, bulletproof transmission that could stand up to that load.

If you can afford them, you might also consider 19.5 inch wheels and tires. They're much more costly than the normal light truck tires, but they're real truck tires and much stronger. Rickson (http://www.ricksontruck.com) makes direct bolt-on wheels in both aluminum and steel that fits our trucks.

Good luck!
Mike

 

^^^^^^^^^all of the above^^^^^^^^^^
wayyyyyy overloaded. Don't forget you have to be able to stop all of that inertia and weight going fwd.