Will an NP-435 with a Dana 20 adapter fit a 351w?

[la hi]

I am replacing my 170ci 6 with a 351w that I will have rebuilt. I have not heard much about the np-435 transmission and would like to know it this transmission will work?
Or would a toploader 4 speed work better?
I have a 66 U14 , 3 on the tree and some of you have said that the 3 speed will not hold up.

 

[Broncobowsher]

Yes, it will work just fine.

The issue with the 3-speed is you are dealing with one for an I6 application, not a V8 application.

What works best, depends on how it will be used.

 

[ScanmanSteven]

A NP435 will definitely hold up, they were used in lots of F250s. The weak link will now be the Dana20, but again, depending on how you use it depends on if anything breaks.

 

[SavageBurro]

not to talk you out of the np435, they're great transmissions. I run one and have run a handful over the years. excellent way to get a granny low but still no overdrive.. there are however other trans out there that might better meet your needs depending on what you're looking for. for example a zf5 has a decent granny low and a nice overdrive. takes a bit more to fit (tad more expensive trans and adapters) and likely require driveshaft mods. food for thought

 

[Cortez]

If you go with the np435, it’s going to require at least 1” body lift because it sits a little higher.

 

[Broncobowsher]

If you go with the np435, it’s going to require at least 1” body lift because it sits a little higher.

I know a lot of people who have run them without a body lift. Including myself. So a body lift isn't exactly a requirement, although it does make things easier. Especially with the 351. Real easy to run out of hood room.

 

[la hi]

Thanks all,
I will let you know the results when I do it. I am thinking that I will use the 3 speed till it breaks. Meanwhile I will keep researching.
larry

 

[Broncobowsher]

Don't use the 3-speed. It's too short. To use it you will have to butcher the firewall to shove the engine back too far. this also puts the oil pump directly above the front diff. The transmission is fairly strong, it's the physical size that is the problem. If you insist on using a 3-speed, find a used V8 version (and matching shift rods).

 

[sykanr0ng]

For a three speed from a V8 ask the guys on Colorado Classic Broncos, many of them have swapped theirs out for something else and may not have taken them in for scrap yet, they are hard to give away around here.

 

[Nothing Special]

I've got a 3-speed from my V8, as well as the Dana 20 collecting dust in the garage. I can't say that I'm real eager to figure out how to ship it, but if anyone wants the pair of them (and/or an AOD with manual valve body and Dana 20 adapter) we can maybe figure something out.

 

[sprdv1]

yes, it will work just fine.

The issue with the 3-speed is you are dealing with one for an i6 application, not a v8 application.

What works best, depends on how it will be used.

x2.......

 

[Bronco Junkie]

I know a lot of people who have run them without a body lift. Including myself. So a body lift isn't exactly a requirement, although it does make things easier. Especially with the 351. Real easy to run out of hood room.

Right, not a requirement but most likely need to cut a big hole in the floor.