6-speed
Junior User
Joined: Jan 2006
Posts: 88
Likes: 0
From: sw Ohio
Bdox, I have some pics of a 4-3 setup but I haven't read up on how to send them. And my e-mail address has changed since I registered on FTE. And I haven't read up on how to change that either. jbbmw
Junior User
Joined: Jan 2006
Posts: 88
Likes: 0
From: sw Ohio
4+3=6 speeds that is
51dueller, checkout the last pic in my 59F350 album. One word of caution to those who want to try this, do not shift up thur the gears with the rear up on jack stands because the rear tires will explode. Don't ask how I know this. The next project in the works is a NP435 behind a T18. Unfortunately the teeth from 2nd gear in the three speed application are in bottom of the case. jbbmw
Last edited by jbbmw; Nov 14, 2006 at 11:18 PM.
Fleet Owner
Joined: Sep 2005
Posts: 28,609
Likes: 18
From: Lake Tahoe, Nevada
Jbbmw, I hope you can make an analysis on what happened to the 2nd gear in the three speed. Especially, if the unususal application contributed to it's failure. I don't mean that I think it did, but then again I don't know why it would fail in that way.
Junior User
Joined: Jan 2006
Posts: 88
Likes: 0
From: sw Ohio
6-speed
Bdox,The 4 speed has a torque multiplication of about 6 times in low gear and 3 times in 2nd. The engine is producing well over 300 lb-ft of torque. 300x6=1800 lb-ft. of potential torque into the 3 speed. In 3rd, of course, the 3 spd transfers torque straight thur the top shaft. But in 2nd torque passes thur the gear train. A good rule of thumb may be, do not plant the right foot until the front transmission is up in third or fourth. Or the rear trans is in direct drive (3rd in a 3spd) or (4th in a 4spd). Either way would have saved the gears. Root cause for the failure was overloading of the gears, although, contributing factors are normal gear wear over the previous life of the 3 spd and the possibility that 2nd gear was not fully engaged when the torque was applied. I did have a temperature sender in the fill plug of the 3 spd. The temp was kept below 200 F on the freeway, by downshifting the 3 spd into 3rd. We were pulling a cargo trailer over the West Virgina mountains. But that's another story. jbbmw
Last edited by jbbmw; Nov 15, 2006 at 08:16 PM. Reason: clarity
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Junior User
Joined: Jan 2006
Posts: 88
Likes: 0
From: sw Ohio
6 speed F-350 now 7 speed
Bdox, checkout the lastest pics in my 59F350 album. The 59F350 now has a NP435 mounted backwards behind the stock 4 spd. for 7 speeds with 3 over direct. jbbmw
Last edited by jbbmw; Jan 6, 2007 at 12:50 PM. Reason: clarity
Junior User
Joined: Jan 2006
Posts: 88
Likes: 0
From: sw Ohio
2019 update the 59F350 is now back to a 4 spesd. The worn out NP435 had a bearing going out so the entire second trans setup was removed and the orginal front drive shaft reinstalled in 45 minutes on the ground. And then we drove home home at 40 MPH. 5.14 gears ugh. lol
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