Tandum rear 60s
Post Fiend
Joined: May 2004
Posts: 5,277
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From: St George, SC I-95
Like I said in post 17 from what Ive read many people who build tamdem rear axle vehicles have a front axle that makes somewhat of a turn. Probably only 10-15* from what I saw but it has to help in turning radius. Like the Macks that have 1" of "slop" in the spring mount there has to be something to absorb some of the lateral stress. I dont think it would be possible to have both rear axles positive traction. I think they would fight each other too much around the street.
Senior User
Joined: Dec 2005
Posts: 229
Likes: 1
From: Fargo, ND
I think that you could take a divorced Dana 24 t-case (used in the Highboys)and flip it backwards and straight up and you would have two outputs facing the rear, one high and one low. Then use an intermediate shaft with a hanger bearing and another short shaft at an angle to reach the rear diff, which would have to be rotated up a bit to relieve the sharp driveline angle. then on the low output of the dana 24 just run a shaft right to the front (1st) diff. The one thing I'm not too sure about, is if the transfer case would be able to oil itself being straight up and down, or not. I was going to try this, but I don't want to butcher my good 78, so I will have to find another truck. Let me know what you think.
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Post Fiend
Joined: Sep 2006
Posts: 5,181
Likes: 3
From: Across from the neighbors
Wow this thread has went on alot longer and better than i imagined. The only problem with turning a transfer around is that i do believe it would spin backwards if im not mistakin. If i am someone let me know.
Senior User
Joined: Dec 2005
Posts: 229
Likes: 1
From: Fargo, ND
I don't think that the gears turning in reverse would hurt anything. I believe they are helical cut, so it would be the same either way.
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Post Fiend
Joined: May 2004
Posts: 5,277
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From: St George, SC I-95
Somebody get off your **** and build one. I nominate Crazyredneck since he started this whole mess.
For the sake of argument I dont think transfercases, regardless of make model chain or gear, were meant to be run 100,000 miles while under the strain of 2 rear axles and the weight/payload trucks so equiped would haul/tow. It might work fine for a while but eventually you will have problems and Id suspect chain stretch would be the first. Besides that Im thinking it would be noisy at highway speed. The unit in post 24 was probably designed specifically for this application and would probably last the longest under the harshest conditions. The only reason I can see why anyone wouldnt use the splitter in post 24 is cost but on the other hand I dont see anyone building a tandem axle truck right now so that really doenst matter now does it? (Im not trying to be a smarta$$) I still fall back on Rockwells being the easiest cheapest and best way to do this since they were designed to be run like this and most likely a front and 2 rears can be bought cheaper than the splitter in post 24.
Stepping down off my soap box
For the sake of argument I dont think transfercases, regardless of make model chain or gear, were meant to be run 100,000 miles while under the strain of 2 rear axles and the weight/payload trucks so equiped would haul/tow. It might work fine for a while but eventually you will have problems and Id suspect chain stretch would be the first. Besides that Im thinking it would be noisy at highway speed. The unit in post 24 was probably designed specifically for this application and would probably last the longest under the harshest conditions. The only reason I can see why anyone wouldnt use the splitter in post 24 is cost but on the other hand I dont see anyone building a tandem axle truck right now so that really doenst matter now does it? (Im not trying to be a smarta$$) I still fall back on Rockwells being the easiest cheapest and best way to do this since they were designed to be run like this and most likely a front and 2 rears can be bought cheaper than the splitter in post 24.
Stepping down off my soap box
Senior User
Joined: Dec 2005
Posts: 229
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From: Fargo, ND
I think that you are correct about the t-case wearing out over the long haul. But I was thinking that this was for off-road use only and for play. I don't think any tandem rear setup would be good for the street on a regular pickup. the tire wear would be insane, not to mention horrible gas mileage. If I ever do build one, it will be for bashing in the fields and brush.
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