Driveshaft problems
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Driveshaft problems
I recently bought a 68 f100 stepside shortbox equipped with a 240 inline 6 and 3 speed tranny. I now have installed a 390 and C6 out of a 72 f100 longbox. My problem is the yoke on the end of the 3 speed tranny moved in and out so a one piece driveshaft was used. On the C6, the yoke on the tranny does not move so a 2 piece driveshaft was used. If I shorten the 2 piece shaft, will the rear shaft be running at too much of an angle? What type of shaft was used on shortbox trucks with a C6? Do I have any other options I am not seeing? I am really anxious to drive it so this last problem is driving me nuts. Also, how important is it too swap front springs from a V8 truck to a 6 cyl. truck when engines are swapped? I would like the truck slightly lowered, but if the 6 cyl. springs are just not tough enough, I would like to know. Thanks
all alone in the world
Joined: Feb 2002
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From: oklahoma
the springs should be alright, but you might take it to a frontend shop and let the check the caster just in case.
un bolt the yoke off of the c6 tranny and see if your yoke will slide in. if it does, and it should, all you should have to do is take a hack saw and cut the threads off the shaft. the shaft is not hard so it will cut pretty easy. you might have to change the rear seal in the tranny also, but i dont think so.
jim
un bolt the yoke off of the c6 tranny and see if your yoke will slide in. if it does, and it should, all you should have to do is take a hack saw and cut the threads off the shaft. the shaft is not hard so it will cut pretty easy. you might have to change the rear seal in the tranny also, but i dont think so.
jim
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Your angle on the rear shaft will not change. The rear shafts on the two-piece design are all the same length on longbed trucks, but the front shaft varies in length depending on the trans. A correct, truck C6 uses a slightly shorter front shaft (with a bolt-on yoke) than the 3-speed, which also used a bolt-on yoke with the two-piece shaft. You don't necessarily need a bolt-on yoke for the front shaft, you can devise a hybrid by using a slip yoke on the front shaft, it won't move in and out but it doesn't have to...in fact, on the later Supercabs (like '75, 76) they used a two-piece 'shaft with a slip yoke on the front shaft (trans end) and the conventional splined back end that the rear shaft moves in and out on.
I hope I explained that right....
I hope I explained that right....
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