Bout to puke
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Senior User
Joined: Nov 2012
Posts: 106
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From: Southern Indiana
Bout to puke
I'm pretty sure the ol' four speed in the highboys bout to puke I have a zf 5 speed for a 460 wondering if anyone know if there is an adaptor to butt up to the 390? Also wanting some opinions on weather or not to change it over to auto?
Elder User
Joined: Apr 2012
Posts: 990
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From: Tamaroa, IL
I couldn't find an adapter, but I think people have done it. The ZF for a 460 should bolt up to a 400/351M, but the bolt pattern is different on the FEs, but maybe there is some sort of adapter out there. Also the ZF5 will be a hydraulic clutch, plus I think that you will have different drive shaft lengths. Depending on what you do with the truck that will play a factor in whether you should go auto. I personally prefer a manual trans, especially if I had a ZF5 with overdrive. Whether you go auto is really up to you. If you already have a ZF5 laying around that's the route I would go, or rebuild your 4 speed (T-18 or NP435) both are pretty easy to work on and are pretty cheap to get rebuilt. IMO I would go with the ZF5
Elder User
Joined: Apr 2008
Posts: 542
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From: Dixon, IL
http://www.high-impact.net/transmiss.../zf_5&6spd.htm
says they are available, but don't show them or price them
says they are available, but don't show them or price them
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