| | Classic Broncos .com - Tech: ZF Transmission into 66-77 Early Ford Bronco |
 | | The ZF S5-42 (and -47) were actually factory equipment in a number of Ford heavy-duty trucks for a few years - they were installed in 2wd and 4wd '87-'95 F250 HD’s, 350’s, and 450’s behind Windsor blocks (so it’ll bolt right up to the 289, 302, or 351W in your Bronco), 460’s, and diesels. |
 | | By notching the front of the crossmember so the ears of the ZF can pass through it, an angle iron bracket welded underneath the crossmember and drilled with the ZF mounting pattern will allow bolting the ears to the crossmember, and the transfer case will be solidly mounted using the original (but modified) adapter. |
 | | Even though the ZF is physically larger than the original 3 speed, you'll actually have more room to run headers and exhaust pipes because the ZF's internal hydraulic throwout bearing allows the removal of the old mechanical clutch linkage. |
| classicbroncos.com /ZF_Transmission_Swap.shtml (2629 words) |