I was asking about tranfer case swaps into my early bronco on classic broncos. com and some one posted all these horror stories about it. Let me know what you think. here is the link:
http://www.classicbroncos.com/forums/showthread.php?t=110468
here is the text of the most worrying post:
I was able ride in and drive J. Miley's 4BT Bronco conversion and we brain stormed a lot on the problems that all the torque from his 4BT created. First, I believe an NV4500 would probably require less adaptation for a 4BT than a ZF, but in answer to your question - an NP205 would bolt right up to a ZF (with minor grinding for the shift rails) and would probably have the strength to hold up to the torque. By the time you adapted and built a D20 to handle the torque you might as well buy an Atlas II.
J Miley used an NV4500 and an AtlasII in his. It had so much torque it pretzeled his drive shaft on the first drive. When he tried to see what low range and 1st gear was like, it ripped the brake pads off trying to hold it at idle in the driveway. After building a monster traction bar to limit the rear axle wrap, it would still twist the frame and compress the front end and every time he shifted it would put you in the next lane. His EB was one of the best engineered Broncos I've ever seen, but with the 4BT it wasn't safe on the street and was prone to breaking the weakest link (U-joints, axles, driveshafts, etc) offroad.
He concluded that to make it safe and reliable on the streetand trail a 4BT EB would require D60's front and rear with a 4 link suspension. He also said if he was doing it again he'd use a TH400 like they came with in the delivery vans to absorb some of the brutal torqueand make it more user friendly.
He spent an awful lot of time and money getting the boost, fuel delivery and intercooler just right. There's a lot more to it than you would think. In reality he said he'd never do it again and would have gone with a FI 351W/NV4500 and Atlas II.
On the cool side, it would absolutely pin you to the seat in any gear and it was loud as hell. I'm not trying to discourage you on your project, just share what he learned. He did it for the adventure of the project and was able to sell it for a nice price. The guy who owns it now lives in CO, but does not participate on this board.
http://www.classicbroncos.com/forums/showthread.php?t=110468
here is the text of the most worrying post:
I was able ride in and drive J. Miley's 4BT Bronco conversion and we brain stormed a lot on the problems that all the torque from his 4BT created. First, I believe an NV4500 would probably require less adaptation for a 4BT than a ZF, but in answer to your question - an NP205 would bolt right up to a ZF (with minor grinding for the shift rails) and would probably have the strength to hold up to the torque. By the time you adapted and built a D20 to handle the torque you might as well buy an Atlas II.
J Miley used an NV4500 and an AtlasII in his. It had so much torque it pretzeled his drive shaft on the first drive. When he tried to see what low range and 1st gear was like, it ripped the brake pads off trying to hold it at idle in the driveway. After building a monster traction bar to limit the rear axle wrap, it would still twist the frame and compress the front end and every time he shifted it would put you in the next lane. His EB was one of the best engineered Broncos I've ever seen, but with the 4BT it wasn't safe on the street and was prone to breaking the weakest link (U-joints, axles, driveshafts, etc) offroad.
He concluded that to make it safe and reliable on the streetand trail a 4BT EB would require D60's front and rear with a 4 link suspension. He also said if he was doing it again he'd use a TH400 like they came with in the delivery vans to absorb some of the brutal torqueand make it more user friendly.
He spent an awful lot of time and money getting the boost, fuel delivery and intercooler just right. There's a lot more to it than you would think. In reality he said he'd never do it again and would have gone with a FI 351W/NV4500 and Atlas II.
On the cool side, it would absolutely pin you to the seat in any gear and it was loud as hell. I'm not trying to discourage you on your project, just share what he learned. He did it for the adventure of the project and was able to sell it for a nice price. The guy who owns it now lives in CO, but does not participate on this board.
