engine swap
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New User
Joined: Jun 2012
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engine swap
I have an 86 Bronco and I am putting in a 91 7.3L IDI diesel and was wonder, after the turbo kit is installed, will I need to change the axels and transfer case? I am afraid that the increase torque will break the gears.
Lead Driver
Joined: Oct 2005
Posts: 6,129
Likes: 1,919
From: Ponca City, OK
if you do have the np 205 t-case it should be ok, it is supposed to be one of the toughest made. as for the axles i'm not so sure, with 35's and hard wheeling they will probably break eventually.you could just run them till they blow then upgrade to dana 60's
Lead Driver
Joined: Sep 2002
Posts: 9,182
Likes: 12
From: Gateway to the West
The NP205 is gear-driven. There is no chain to stretch or break and it can be modified to "twin stick" operation. They are a sought-after commodity. By the way, don't worry about it behind a 7.3. The BW t-case that lived behind that 7.3 in 1991 was a far weaker unit.
Fleet Mechanic
Joined: Sep 2009
Posts: 1,404
Likes: 14
From: Bloomington, IN
Just my advise, go to "fullsizebronco.com" there are alot of guys over there that have done diesel swaps. Good guys like FTE...many threads over there with all the "correct" answer's to your questions.
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