What 4speed?

steveinaz · Post by **steveinaz** » Sun Mar 19, 2006 7:07 pm

What 4 speed is in the D400/500? Am I right to assume that it is some version of the Np435 with a larger input? (Any leads on locating one would be greatly appreciated too.) SteveinAZ

Website · Post by **wideblock** » Sun Mar 19, 2006 7:43 pm

the 435 would have been used, its a lot stronger then the 420. most of the ones i have seen are 5spds.

steveinaz · Post by **steveinaz** » Sun Mar 19, 2006 9:19 pm

I thought I had seen one years ago. I remembered the input shaft being larger than the 1 ton and below trans. Wish I could find one laying around so I could measure it. SteveinAZ

HEtkind · Post by **HEtkind** » Mon Mar 27, 2006 2:21 pm

the NP420 is actually STRONGER than the NP435. The difference is that the 420 is a cast iron case, while the 435 is aluminum, and the 420 is only synchro in 3 and 4 while the 435 is fully synchro.

Now the NP540 is the five speed tranny.

Running a NP420 in the 62 D-100 town wagon...

RussRoth · Post by **RussRoth** » Mon Mar 27, 2006 3:19 pm

HEtkind wrote:the NP420 is actually STRONGER than the NP435. The difference is that the 420 is a cast iron case, while the 435 is aluminum, and the 420 is only synchro in 3 and 4 while the 435 is fully synchro.

Now the NP540 is the five speed tranny.

Running a NP420 in the 62 D-100 town wagon...

I have no opinion or knowledge of whether one is stronger than the other. I do know the 435 is a CAST IRON case not aluminum. The top cover is aluminum. It also is not full synchro as there is no synchro on 1st gear. The 445 close ratio is supposed to be full synchro although I have never seen or driven one so I can't say for certain.

RussRoth · Post by **RussRoth** » Mon Mar 27, 2006 10:34 pm

HEtkind wrote:the NP420 is actually STRONGER than the NP435. The difference is that the 420 is a cast iron case, while the 435 is aluminum, and the 420 is only synchro in 3 and 4 while the 435 is fully synchro.

Now the NP540 is the five speed tranny.

Running a NP420 in the 62 D-100 town wagon...

I have no opinion or knowledge of whether one is stronger than the other. I do know the 435 is a CAST IRON case not aluminum. The top cover is aluminum. It also is not full synchro as there is no synchro on 1st gear. The 445 close ratio is supposed to be full synchro although I have never seen or driven one so I can't say for certain.

RussRoth · Post by **RussRoth** » Mon Mar 27, 2006 10:45 pm

HEtkind wrote:the NP420 is actually STRONGER than the NP435. The difference is that the 420 is a cast iron case, while the 435 is aluminum, and the 420 is only synchro in 3 and 4 while the 435 is fully synchro.

Now the NP540 is the five speed tranny.

Running a NP420 in the 62 D-100 town wagon...

I have no opinion or knowledge of whether one is stronger than the other. I do know the 435 is a CAST IRON case not aluminum. The top cover is aluminum. It also is not full synchro as there is no synchro on 1st gear. The 445 close ratio is supposed to be full synchro although I have never seen or driven one so I can't say for certain.

RussRoth · Post by **RussRoth** » Mon Mar 27, 2006 10:55 pm

HEtkind wrote:the NP420 is actually STRONGER than the NP435. The difference is that the 420 is a cast iron case, while the 435 is aluminum, and the 420 is only synchro in 3 and 4 while the 435 is fully synchro.

Now the NP540 is the five speed tranny.

Running a NP420 in the 62 D-100 town wagon...

I have no opinion or knowledge of whether one is stronger than the other. I do know the 435 is a CAST IRON case not aluminum. The top cover is aluminum. It also is not full synchro as there is no synchro on 1st gear. The 445 close ratio is supposed to be full synchro although I have never seen or driven one so I can't say for certain.