how do you lock the rear

[CorbettTrailers]

I'm a little late. but I locked mine with Freddy's method. I drilled and tapped a hole. It still requires complete disassemble of the axle hosing and differential, but I've had no problems. And this includes hauling the neighbor kids around on my trailers and running in grass. Freddy would prolly be able to tell more. I locked mine right before the Brookville meet in March and I'd have to tear mine apart to remember how to do it. Too many knocks on the Noggin', even with a helmet it still had an effect.
But glad you got it locked!

[CustomRCmodels]

I lock my diff’s with hot-melt ( glue-gun ) ,
Since that stuff stays somewhat flexible , it allows some very little movement ,
more like it flexes . With that method I never had any issues , no matter how much I pulled or what ever crazy stuff I do with my trucks .
All these other methods maybe a little to stiff , therefore the one or the other experience some damages upon depending how much torque you apply to your axles .
I would like to find a real super heavy grease , which would act like a limited slip differential , but so far no luck . Everything I came across so far was still to thin .
I been also thinking about using shims in the diff’s , to make everything work , but with a lot more resistance , again , similar to a limited slip differential , but didn’t get to that one yet … to much work , not enough time , ha

Besides , these days I am tending to improve my suspension and add weight to the tires and frame , as long you can keep your tires on the ground , you don’t need no locked diff’s , excepted you drive in very loose ground or sand .

this one here has NO locked diff's and I never got stuck with it !
http://www.customrcmodels.com/Trucks...wd_project.htm

[9W Monighan]

I would like to find a real super heavy grease , which would act like a limited slip differential , but so far no luck . Everything I came across so far was still to thin .


This is what I was going to suggest with stiff oil. My brother told me about this technique they use with their racing buggy's and trucks.
Try some silicone grease from the plumbers section at Home Depot.
There is a semifluid oil we use on our old Cats to lube the rollers. I think it is known as "00" semi fluid grease.
I have some of that and some Castrol Longtime PD O these greases are like vasalene consistancy.
Another grease to try may be the stuff they use on binocular and camera lenses. That would give a nice slow movement. There are different grades for varying temperatures the binos work at.