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Old 09-24-2008, 08:35 PM   #1
wetatt4u
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Default Doug Nash 4+1 (5 speed )

Hey Guys

Can anyone tell what will be needed to install DN 5 speed into a 55 chevy?

I had a three speed in it original from the factory,changed out to an th350 many moons ago and want to change back to a straight drive.

Main question is ....

1)will in fit in the trans tunnel ?

2)what about the cross member?

I still use the front motor mounts,

Can anyone tell me if I'll need the back side mounts ,I think I've gathered all the parts needed ,

But just trying to make sure before I take it apart that I have all the parts and don't want to wait around to find any last minute parts..

Hope this make sense,

Thanks to all in advance for any help...
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Old 09-24-2008, 08:46 PM   #2
thehazmatguy
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Default Re: Doug Nash 4+1 (5 speed )

You should be able to fit the DN trans into your car without any trans tunnel modification.

I'm just about done getting a Tremec five speed in my 55 sedan. Unless you have scored a deal on the Doug Nash I would recommend checking out the Tremec.

Cross memember? How do you have the current engine and trans in the car now? You should not be using front mounts and a rear trans crossmemeber. Either use the front mounts and the bellhousing side mounts, or convert to engine side mounts and a trans crossmember.
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Old 09-24-2008, 08:46 PM   #3
hotrodladycrusr
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Default Re: Doug Nash 4+1 (5 speed )

It's been awhile but if my memory serves me right from my past Corvette days, those transmissions were/are junk. Mid '80's Corvette I think??
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Old 09-24-2008, 08:49 PM   #4
32v
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Default Re: Doug Nash 4+1 (5 speed )

they are a five speed but not overdrive
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Old 09-24-2008, 08:49 PM   #5
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Default Re: Doug Nash 4+1 (5 speed )

The 4+1 5 speeds were race transmissions. The 5 speed OD were not all that hot. The 4+1 Is a pretty sturdy piece. They even made one with "torsion bar " shafts to absorb the pounding. A buddy of mine ran one in a 67 stang stocker. Used to leave the line @ 8500RPM and shift @ 9800 !

Oh, and you shouldn't have much trouble installing it in your Chevy.
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Old 09-24-2008, 08:51 PM   #6
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Default Re: Doug Nash 4+1 (5 speed )

Quote:
Originally Posted by wetatt4u View Post
Hey Guys
1)will in fit in the trans tunnel ?

2)what about the cross member?
I have no idea if it will fit in the trans tunnel, but its big in the tail shaft and could easily be a challenge.

As long as it is, and as heavy as I imagine it is near the output shaft, I'd think a rear cross member might be required, but I don't know that with certainty. I've been under a Corvette with one of these from the factory and can't remember if it has a crossmember or not, but it did have the torque arm that does provide some stiffness and support for the transmission.

I'm not sure I'd try to use one of these transmissions. I say that having driven one today, which I do most days. Its not a popular transmission among Covette circles and you read more about replacing it than anything else.

It is a Super T-10 with an overdrive, and that's a nice thing, but its not like driving a 5-speed. The computer controlled OD doesn't behave quite how most people would like. I assume you are going to control it manually, but still you're driving a 4-speed with a switch for OD.
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Old 09-24-2008, 08:58 PM   #7
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Default Re: Doug Nash 4+1 (5 speed )

Quote:
Originally Posted by hotrodladycrusr View Post
It's been awhile but if my memory serves me right from my past Corvette days, those transmissions were/are junk. Mid '80's Corvette I think??
Yeah, has to be junk if Richmond bought the design and is still using it to make the 5 and 6 speed Richmond gear boxes.

My buddy has a DN 4+1 in his Ram Air III T/A and it's held up to more of a beating than the ST-10 in my T/A has.

80's vettes were probably using T5's or something, DN 4+1 transmissions were aftermarket units. DN DID make the goofy 4+3 semi-automatics that were installed in some of the 'vettes. They were a Super T-10 with a 3-speed automatic box hanging off the back.

The DN4+1 is a 5-speed with an ultra-low 1'st gear and 1:1 5th so you can use highway gears and still get good performance.

Shawn
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Old 09-24-2008, 09:09 PM   #8
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Default Re: Doug Nash 4+1 (5 speed )

Anyone out there have one of the MLM clutchless conversions?
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Old 09-24-2008, 09:15 PM   #9
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Default Re: Doug Nash 4+1 (5 speed )

Quote:
Originally Posted by Lotek_Racing View Post
DN DID make the goofy 4+3 semi-automatics that were installed in some of the 'vettes.

Shawn
Thats the one I was thinking of.
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Old 09-24-2008, 09:21 PM   #10
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Default Re: Doug Nash 4+1 (5 speed )

I had a DNE 4+1 (not a Corvette trans, not an overdrive) in a '57 Bel Air Sport Coupe.

Ratios in the street 5-speed: 3.27, 2.14, 1.57, 1.23, 1:1

Fits in the trans tunnel no problem, no mods needed other than to cut a hole for the shifter.

Uses a TH400 output yoke.

As already mentioned, either use the stock front engine mounts/bellhousing mounts or convert to side engine mounts and add a trans crossmember.

Also used to run a DNE 4+1 in my GTO, it was a nice trans and could take a beating pretty well. Still have the trans, soon it may find its way back into one of my Pontiacs again.
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Old 09-24-2008, 09:30 PM   #11
Larry T
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Default Re: Doug Nash 4+1 (5 speed )

The older DN 5 speeds were crashbox type race transmissions. They used square cut gears and no synchronizers. Not very street friendly. Richmond makes one that has synchros for roadracing and street driving.
Larry T
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Old 09-24-2008, 09:33 PM   #12
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Default Re: Doug Nash 4+1 (5 speed )

GM NEVER installed a T5 in a corvette
they could barely handle a 305
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Old 09-24-2008, 10:04 PM   #13
Lotek_Racing
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Default Re: Doug Nash 4+1 (5 speed )

Quote:
Originally Posted by spiderdeville View Post
GM NEVER installed a T5 in a corvette
they could barely handle a 305
Didn't know for sure, not a corvette guy.

The 80's DID give us the 305 'vette though.

Shawn
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Old 09-24-2008, 10:29 PM   #14
wetatt4u
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Default Re: Doug Nash 4+1 (5 speed )

To answer some questions

I already have the DN and have used it in a 68 firebird and it is the 5 speed like dragginGTO spoke of. and I do have the th400 yoke..

I have the trans cross member in my car now with the th350 auto transmission...

Its not a overdrive trannie ,but a true 5 speed ,with low 1st thur 4th and then 5th for cruzin...

Richmond did buy the design years ago ,however for the most part they are still making the trans ,they call it the richmond 5 speed and even designed the 6 speed after it...

QUESTION ....
Will the th350 auto cross member work for the DN?
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Old 09-24-2008, 11:21 PM   #15
Lotek_Racing
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Default Re: Doug Nash 4+1 (5 speed )

Quote:
Originally Posted by wetatt4u View Post
QUESTION ....
Will the th350 auto cross member work for the DN?
I believe it will, they were designed to be a bolt-in replacement in the second-gen Camaro and Firebird. The ST-10 uses the same crossmember as a TH-350 so I imagine the DNE trans would use the same.

If not, how hard is it to make a crossmember?

Shawn
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Old 09-25-2008, 06:07 AM   #16
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Default Re: Doug Nash 4+1 (5 speed )

The advice about using the side mounts on the engine is right on...
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Old 09-25-2008, 09:07 AM   #17
wetatt4u
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Default Re: Doug Nash 4+1 (5 speed )

I know I can re fabricate,the cross member ,

just trying to get my ducks in a row before I get started...

Thanks to EVERYBODY that replied with helpful information...................
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Old 09-25-2008, 09:21 AM   #18
Larry T
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Default Re: Doug Nash 4+1 (5 speed )

OK. I just went and measured. The DN 5 speed transmission mount is around 22 1/2" from the back of the block. Looks like it's about 2" further back than a 4 speed or Turbo 350 and not as far back as the Turbo 400 (somewhere around 27").

Overall length looks to be around 27 1/2" on the 350 and 28 1/2" on the 400 and the DN.

If you use a front mount for the engine, you'll have to use the stock bellhousing mounts. If you want to eliminate the bellhousing mounts, you'll have to go with side mounts on the engine.
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Last edited by Larry T; 09-25-2008 at 09:38 AM.
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Old 09-25-2008, 11:51 AM   #19
wetatt4u
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Default Re: Doug Nash 4+1 (5 speed )

Thanks Larry T
Thats exactly what I needed to know !
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Old 09-25-2008, 01:00 PM   #20
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Default Re: Doug Nash 4+1 (5 speed )

Something no one has mentioned about this transmission is that ALL
the individual gear ratios can be changed independently to tailor it to any application.
Keep in mind that 5th is direct and that will usually dictate changing the rear end ratio to suit your type of driving.
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