Changing DN4+3 into "normal" 4 speed?
Thread Starter
Tech Contributor
Joined: Jun 2004
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From: I tend to be leery of any guy who doesn't own a chainsaw or a handgun.
Changing DN4+3 into "normal" 4 speed?
Just curious if anyone has done this. I've got a Richmond 6 speed in the car at the moment, but it's more gearing than I need with my track engine, and I'd like to go back to a four speed (smaller and lighter). The OD in the DN setup seized up years ago, and the "front" box has been sitting on a shelf for a buncha years.
At first glance, I see a few things in the front box that need changing to do this, but I'm sure there are several details that I'm not aware of.
Thanks for any constructive input.
At first glance, I see a few things in the front box that need changing to do this, but I'm sure there are several details that I'm not aware of.
Thanks for any constructive input.
Le Mans Master
Joined: Aug 2017
Posts: 6,939
Likes: 1,488
From: New Jersey
Iirc I think if you use a regular super t10 tail housing and fab a C-beam bracket it'll work. When I replaced my overdrive internally the front seemed no different than the super t10 on the floor jn the garage.... probably have some driveshaft work too but it is just a T10 front...
I'm pretty sure there was just a second adapter plate bolted to the rear of the T10 to adapt the DNE bolt pattern.
Edit: if you're up for selling the 6 speed I may be interested lol
I'm pretty sure there was just a second adapter plate bolted to the rear of the T10 to adapt the DNE bolt pattern.
Edit: if you're up for selling the 6 speed I may be interested lol
Last edited by 84 4+3; Dec 30, 2020 at 05:24 PM.
Le Mans Master
Joined: Feb 2005
Posts: 6,477
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From: Clearwater Florida
..... The output shaft is different and would need to be changed ... they weren't very plentiful , but the Super T10 used in 3rd Gen F-bodies has the same ratio spread as the 4+3 front box and would at least provide all the reverse gear pieces and parts that would also be needed to convert the Doug Nash box to a straight 4 speed .....
Thread Starter
Tech Contributor
Joined: Jun 2004
Posts: 20,850
Likes: 959
From: I tend to be leery of any guy who doesn't own a chainsaw or a handgun.
Iirc I think if you use a regular super t10 tail housing and fab a C-beam bracket it'll work. When I replaced my overdrive internally the front seemed no different than the super t10 on the floor jn the garage.... probably have some driveshaft work too but it is just a T10 front...
I'm pretty sure there was just a second adapter plate bolted to the rear of the T10 to adapt the DNE bolt pattern.
Edit: if you're up for selling the 6 speed I may be interested lol
I'm pretty sure there was just a second adapter plate bolted to the rear of the T10 to adapt the DNE bolt pattern.
Edit: if you're up for selling the 6 speed I may be interested lol
Previously, I pulled enough weight out of my '69 that I didn't need the extra gearing of the DN4+1 I had in it, so I pulled it out and put the original lighter Muncie back in. I've got a turbo 355 in my '84, and with the boost the extra gears of the six speed aren't as necessary as they used to be.
