5 Bolt 289, NP435 4 Speed... How to? - Ford Muscle Forums : Ford Muscle Cars Tech Forum
 
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post #1 of 3 (permalink) Old 06-17-2019, 01:24 PM Thread Starter
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5 Bolt 289, NP435 4 Speed... How to?

Thanks in advance for any help you might have...

New not only to these forums, but Ford in general. Leaned over the weekend, the hard way, that Ford changed styles of bell housings in mid-64 on the small block motors. I have a 64, 289. All nicely rebuilt, assembled, painted and ready to go. Finally found the tranny (70s NP435) and transfer case that I needed for my son's Jeep project. Went to bolt everything up and discovered that the 5 bolt bell housing on the 289 only has the narrow bolt pattern, while the tranny is a wide bolt pattern typical of the post 65 4-speeds! Ouch!!

Been googling since last night and not finding any adapters to put a 6 bolt bell housing (which I also have) onto the 5 bolt block.

Now I am stuck and looking for advice. Scrap the 64 289 with tons of money and hours into it and start over or find a narrow tranny that I can bolt to the 5 bolt bell housing. What type of narrow 4 speed will take the abuse of off roading in a jeep and still bolt up to that 5 bolt bell housing?
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post #2 of 3 (permalink) Old 06-23-2019, 10:20 AM
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Re: 5 Bolt 289, NP435 4 Speed... How to?

I feel your pain and this is just my two-cents.

The early 5-bolt block has very few aftermarket options whereas the later, '66 and later 6-block is pretty much the standard for the aftermarket.

This may be hard to swallow, and again only my opinion, but I would recommend finding a 6-bolt block (289 and 302 are interchangeable) and put the current 5-bolt, 289 guts in it. Sell the 5-bolt block to a restorer to make up some $$$ and by switching to the "modern" 6-bolt block, you have just not opened the door for infinite parts. This would be soooooo much easier in the long run.

Racing Cougars (the other Mustang), for four decades...
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post #3 of 3 (permalink) Old 06-26-2019, 08:32 AM Thread Starter
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Re: 5 Bolt 289, NP435 4 Speed... How to?

Quote:
Originally Posted by k718cougar View Post
I feel your pain and this is just my two-cents.

The early 5-bolt block has very few aftermarket options whereas the later, '66 and later 6-block is pretty much the standard for the aftermarket.

This may be hard to swallow, and again only my opinion, but I would recommend finding a 6-bolt block (289 and 302 are interchangeable) and put the current 5-bolt, 289 guts in it. Sell the 5-bolt block to a restorer to make up some $$$ and by switching to the "modern" 6-bolt block, you have just not opened the door for infinite parts. This would be soooooo much easier in the long run.
Yeah, that's one of the top options I am looking at. I have a 289/6-bolt sitting on the floor. I might just rebuilt that, sell the 5 bolt as a rebuilt, ready to run motor and move on.
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