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Wich NP435?

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Old Mar 18, 2004 | 04:41 PM
  #1  
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68 351 bronc
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From: Colville
Wich NP435?

I need a output shaft for a NP435 to D20 conversion in my EB.
Went to the local junkyard and there is 2 different 2Wd output shaft lengths, 4.25 and 5.5 approx. Wich works with the Advance Adapter?
Is it cheaper to go with a 6 cyl stock adapter?
I read somthing on this a while back but I can't seem to find it.

Ed
 
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Old Mar 19, 2004 | 11:45 PM
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RCrawler
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From: Southern Oregon USA
You are looking for the one with a 28 spline output shaft which is the common version found in 1/2 and 3/4 ton Fords. Should be the longer of the two. I believe that the shorter, HD version is a 30 or 31 spline.

If you happen to have a factory 6 cylinder adaptor, then going with the adaptor plate kit is more cost effective. But, if you have to buy the 6 cyl adaptor and the plate, then you will almost spend the same amount in the end. IMO, I would go with one of the adaptors from a Bronco parts supplier such as Tom's. The AA adaptor is a quality unit, but the way that it is designed makes service and accessibility a hassle. I have found that the adaptors made using the stock adaptor (such as Tom's) are just easier to use. I'm not advertising their stuff, I've just done a lot of 4 speed conversions with their adaptors. I think that WH and Jeff's offer the same type.

HTH,
Jason
 
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Old Mar 20, 2004 | 12:11 AM
  #3  
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68 351 bronc
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From: Colville
RC that is what I thought and wanted to hear.
I don't have any adapter. I sold every one I ever had and knew one day I would regret it.
Have you had any experience with the NP 540 5sp trans out of the 60s trucks? they have 2 different unsinkrode?? low gears. I believe it is possible to put one in place of the 435. Does any one know?
 
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Old Mar 20, 2004 | 11:08 AM
  #4  
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RCrawler
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From: Southern Oregon USA
I've never looked into the 540 for a swap. The output shaft is super HD, so you would be on your own for an adaptor. If you have access to a good machine shop, and the time to do it, it could be done. I don't think that you gain much with the gear ratio though. Seems like 1st gear is about the same as the 435 and 5th gear is non OD. So, it splits the jump between 3rd and 4th.

Another option is the Clark 5 speed. There are several different options you can go with ranging from super low gears to OD. The biggest problem with these transmissions is that they are truck (not pickup) transmissions and drive accordingly. Very loud in operation and hard shifting with a clutch by design. A friend of mine built one for his Jeep. Liked the gearing options. There was a company that was building adaptors for them. "Performance- something", I can't remember.

If you're not too low geared to be without an OD, the 435 is about the best there is, IMO. Still common to find parts for new and used. Drives pretty good for a truck transmission. Easy and cheap to swap.

Jason
 
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