Dually adapters?

[Badfish740]

I have a 1991 Toyota pickup that I'm building into a heavy duty off road firewood hauler. The idea is a compact and light truck that can haul heavy loads over rough terrain. I have 100 acres I'm allowed to cut on crisscrossed by overgrown logging roads, skidder trails, dry creeks, etc... I'm in the process of finding a rear axle to convert to a full floater to handle the weight, but I'd really like to put dual rear wheels under the flatbed. I found this old pic online from a Full Size Jeep forum of a dually adapter, but the company that made it has long gone out of business. I'm thinking of trying to find a local fabricator who could build a set. Might be $$$, but worth it I think. Anybody ever do anything similar with a Toyota?

[whitwilliams74]

Toyota one ton axle. I just googled it and found a u tube video on a axle swap.

[oldenginebuilder]

Frame strength isn't there, or I'd suggest swapping any old GM 10.5" 14-bolt FF, they're rated to carry 8,600#, they're everywhere, they're cheaper than those fail adapters you pictured, and it ain't that hard to adapt one to your spring spacing, driveshaft, brake lines, and shock absorber locations.
If you want to carry such loads, sell the 'yota and get a real dually.

[Provience]

Toyota made a factory 1-ton dually in the 80's. essentially the 2wd standard mini truck with Dual Rear Wheels, full floater axle and heavier springs. Look into that direction first.

[Elwenil]

I believe the they made them through the '90s as well. There were many dually Toy U-haul trucks around here with the '90s cab at one time.

[Badfish740]

Originally Posted by Elwenil

I believe the they made them through the '90s as well. There were many dually Toy U-haul trucks around here with the '90s cab at one time.

Originally Posted by whitwilliams74

Toyota one ton axle. I just googled it and found a u tube video on a axle swap.

The problem with the factory one ton axles is the bolt pattern. It's 6x7.25" which is a real oddball-you're pretty much limited to the 14" Toyota OE wheels at that point-I've heard that you can find 15" wheels though. I'm running 265/75/16 Treadwright Guard Dogs on 16x7.5" Tundra steel wheels.

Originally Posted by oldenginebuilder

Frame strength isn't there, or I'd suggest swapping any old GM 10.5" 14-bolt FF, they're rated to carry 8,600#, they're everywhere, they're cheaper than those fail adapters you pictured

8600lbs is a lot. I'd be happy to be able to carry 4000 (A full cord of green wood) comfortably. How much different are those adapters than whatever factory duallys use?

Originally Posted by oldenginebuilder

If you want to carry such loads, sell the 'yota and get a real dually.

The problem is they can't fit down the trail-the 'Yota can

[sjracer]

get a SRW full floater 14 bolt and haul your 4k easily. still the same width as a dually toyota axle and easy/cheap to find rims/parts for. easy to adapt to your frame.

ive worked on those toyota dually's for years. they bring the suck when it comes to getting parts. and those adapters your looking at are an abortion at best.

[oldenginebuilder]

Axle capacity isn't just the desired payload, it's also the weight of the rear half of the pickup itself.
For that, you need something rated to at least 6500, which is the upper limit of a FF Dana 60.
I'm still gonna state that your 'yota frame won't survive that much weight with that much flexing.
Box an S-10's rear C-channel frame, that might survive.