Driveshaft fit question

1971fordsdad · Post by **1971fordsdad** » Mon Jul 28, 2008 10:57 am

Okay, here's the deal. Ryan and I pulled the 429 and trans out of his 69 F250 and want to put it in his 71F250. The 69 had a single piece drive shaft and the 71 has a two piece drive shaft with carrier bearing. Can I use the one piece driveshaft that came out of the 69? The 69 also has marks on a crossmember indicating that there was once a carrier bearing in it. They also both have Dana 60 rearends. I haven't compared the overall lengths of the two transmission. The one-piece driveshaft is shorter than the two piece. I am hoping the tail housing on the c-6 that goes with the 429 is longer and that it will work.
Thanks,

Wes · Post by **Wes** » Mon Jul 28, 2008 2:06 pm

What are the wheel bases for the 2 trucks. if you use the same 429 trans you will probably need to use the 1 piece drive shaft.

1971ford · Post by **1971ford** » Mon Jul 28, 2008 2:08 pm

they are both f250 longbeds.

cant we just swap in the 429 with its tranny (like we are doing) and use the one peice?
it worked in the 69 donor, it should work in an identical truck with all the same parts
i dont see why not

flatblack · Post by **flatblack** » Mon Jul 28, 2008 2:13 pm

ya it should work without a problem, the only thing is if your using different transmissions the one your putting in might require a different trans crossmember.

averagef250 · Post by **averagef250** » Mon Jul 28, 2008 2:20 pm

They're the same truck, I don't see the problem if it worked in one it'll work in the other.

An F-250 should have a two piece because of the length, but a one piece will work.

1971ford · Post by **1971ford** » Mon Jul 28, 2008 2:24 pm

yeah i noticed the driveshaft was crazy long. but i dont like the idea of a two peice driveshaft in a desert racing truck. should be good to go

1971fordsdad · Post by **1971fordsdad** » Mon Jul 28, 2008 2:52 pm

Ryan, go yank the crossmember out of the 69!!!

1971ford · Post by **1971ford** » Mon Jul 28, 2008 2:59 pm

hold on i will do some comparisons first. besides its probably a big rivet mess

and you never picked up the air chissel

chop chop!

spartman · Post by **spartman** » Mon Jul 28, 2008 3:40 pm

So you are saying not to go past 60 inches with a single shaft then?

If one goes past 60 would that automatically dictate a 2 pc shaft even if the drive angles might become to steep with a 2 pc setup?

averagef250 · Post by **averagef250** » Mon Jul 28, 2008 5:31 pm

Ideally, keep it under 5 feet, but drivelines get into the 5-6 foot range even in production vehicles.

Length doesn't automatically dictate a two piece shaft, but racing (atleast high speed stuff) pretty much makes you take a firmer stance on driveline rules.

From a true desert race perspective neither a 6 foot driveline nor a two piece driveline would be acceptable. The ideal setup would be 60" or less single so that means either a shorter wheelbase or moving the engine back.

1971fordsdad · Post by **1971fordsdad** » Mon Jul 28, 2008 6:01 pm

1971ford wrote:hold on i will do some comparisons first. besides its probably a big rivet mess

and you never picked up the air chissel
chop chop!

The tranny cross member is bolted in!!!! Only one bolt on each side. Shouldn't be too hard even for you!!

flyboy2610 · Post by **flyboy2610** » Mon Jul 28, 2008 6:32 pm

You tell him, Dad!

1971ford · Post by **1971ford** » Mon Jul 28, 2008 11:22 pm

i know i checked them out. one bolt, each side. give me a day though. thats like 4 bolts i have to remove. i mean jeeze all ive ever done is completely dismantle a truck (still doesnt mean i can put it back together

)

SteveC · Post by **SteveC** » Tue Jul 29, 2008 1:05 am

hope you remember where everything goes...

price2757 · Post by **price2757** » Tue Jul 29, 2008 4:56 am

Why do I keep getting this image of Ryan in one room of the house posting to his Dad in the other room?

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