converting from divorced to married tranfercase?
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Senior User
Joined: Jun 2003
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From: Star, Idaho
converting from divorced to married tranfercase?
I recently heard of someone converting a a divorced trafercase to a married one. Has anyone else done this? I think all that would need to be done is move the crossmember forward and get a longer rear driveshaft right? I ask this because once when I had my last 77 F250, the u-joint broke and cut a hole inthe bottom of the cab.
Postmaster
Joined: Apr 2003
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From: Virginia Beach
Just a little thinking on my part. . .I have come up with this list:
If your truck is a standard cab/long bed, grab an F-150 (mid 70's up to 79 should do) or 78-79 F-250/350 of the same style truck as yours and Tcase/tranny you want and grab the following:
-Front drive shaft
-Transmission (or at least output shaft. Will reguire complete tranny disassembly to swap output shafts)
-Tcase adaptor
-Tcase shifter linkage
-Tranny cross member and mount
-Tcase
-Speedo cable
-Tcase frame mount
-Rear drive shaft (if using 1/2 ton parts on 3/4 ton, double check drive shaft length)
-You may need to reroute your exhuast as well
Don't just toss your Hiboy hardware either. It should fetch a fair price if you were to sell it, especially the divorced Tcase
Someone else should post if I miss anything, or they may tell you to just beef up your intermediate shaft, which is my recomendation. Check out the off road forum, there is a guy named Proeliator running about 600 HP through his HiBoy. Maybe ask him where he got his made
If your truck is a standard cab/long bed, grab an F-150 (mid 70's up to 79 should do) or 78-79 F-250/350 of the same style truck as yours and Tcase/tranny you want and grab the following:
-Front drive shaft
-Transmission (or at least output shaft. Will reguire complete tranny disassembly to swap output shafts)
-Tcase adaptor
-Tcase shifter linkage
-Tranny cross member and mount
-Tcase
-Speedo cable
-Tcase frame mount
-Rear drive shaft (if using 1/2 ton parts on 3/4 ton, double check drive shaft length)
-You may need to reroute your exhuast as well
Don't just toss your Hiboy hardware either. It should fetch a fair price if you were to sell it, especially the divorced Tcase
Someone else should post if I miss anything, or they may tell you to just beef up your intermediate shaft, which is my recomendation. Check out the off road forum, there is a guy named Proeliator running about 600 HP through his HiBoy. Maybe ask him where he got his made
Post Fiend
Joined: Jul 2003
Posts: 11,945
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From: Spokane, WA
Franken did a good job of covering everything you'd need to do this swap. Also remember that your front driveshaft will be a lot shorter and will probably cause need to adjust the angle of the pinion on the front axle which can require a fair amount of shimming. I'd recommend you have a beefy intermediate shaft built if you plan to run high HP through it. As mentioned Pro beats on his truck with over 600 horse, has blown up the rear driveshaft, but has never had the intermediate let go.
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Senior User
Joined: Jun 2003
Posts: 351
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From: Star, Idaho
It almost sounds like more trouble than what its worth. I could just build a driveshaft loop to protect the underneath should a u-joint break. Thanks for the input though! I was debating on getting a divorced NP203 near here to build a doubler, looks like I'll be getting it after all.
Lead Driver
Joined: Sep 2003
Posts: 5,241
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From: Other side of the sunrise
Personally, I prefer the divorced T case in the 73-77. It seems to have a more classic 4x4 origin appeal to it. Personal preference. I check my u joints at oil changes to make sure I dont fly a driveshaft. I like that idea though, about the loop.
Post Fiend
Joined: Jul 2003
Posts: 11,945
Likes: 3
From: Spokane, WA
Originally Posted by olfordsnstone
Personally, I prefer the divorced T case in the 73-77.
Last edited by ivanribic; Oct 1, 2005 at 12:24 AM.
