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Doug Nash 4+1

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Doug Nash 4+1

Postby runawy9 » Thu Feb 14, 2008 12:26 pm

I can pick up a Doug Nash 4+1 pretty cheap. It has been rebuilt and never put into a car and the guy ony want what the rebuild cost him. Is this tranny any good or are they junk.
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Postby BH » Thu Feb 14, 2008 4:38 pm

What is it going to be used for.
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Postby runawy9 » Thu Feb 14, 2008 5:54 pm

I'd like to use it in a street/strip car. More of a street car. Not sure how well it would work. I don't know a whole lot about the Doug Nash's.
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Postby BH » Fri Feb 15, 2008 1:15 pm

Thats not enough info. How much power, weight, power adder etc.
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Postby melsie68 » Fri Feb 15, 2008 3:46 pm

my dad tried one out in my '68 Camaro a while. it was the dog ring style transmission. i believe some were synchronized too. needless to say it wasn't much fun on the street. i am not sure if something was wrong with it or we didn't know how to use it. the thing of course had terrible low speed shifting manners but at the same time didn't shift well at high engine speeds where i thought these were supposed to be great. my power levels were probably about 425hp at the tires.
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Postby runawy9 » Fri Feb 15, 2008 4:25 pm

3600 lb chevelle with small block around 400 horsepower, 4.11 gears, and drag radials. The engine turns around 6800 rpm. The low speed shifting is what I was concerned about. How would it act in traffic?
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Postby af2 » Fri Feb 15, 2008 5:03 pm

I know of 2 personally that are still going strong after 20 years and no rebuilds. 1 is behind a blown 327 that runs 11.0 1/4 mile and shifts at 7800 rpm 3000 lb. #2 is behind a 292 straight 6 that runs 10.70 and shifts at 8500 rpm and is 3200 lbs. with around 500 or so passes. We don't get too many passes in nostalgia. Both of those shift as smooth as any Muncie.
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Postby Ed-vancedEngines » Fri Feb 15, 2008 10:57 pm

Years ago I knew a guy that was running the Torque tube version behind a 9,000 rpm BB Chevy in the mid 9's. That was many years ago though. At the time I was running a 4 speed Chrysler in the high 8's.

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Postby xenginebuilder » Sat Feb 16, 2008 12:21 am

runawy9 wrote:I can pick up a Doug Nash 4+1 pretty cheap. It has been rebuilt and never put into a car and the guy ony want what the rebuild cost him. Is this tranny any good or are they junk.


These transmissions were eventually sold under the Richmond Gear banner after they bought the rights to this transmission, I used to work for a retail co that sold these. For HP street use, they seemed to be as strong or stronger than equiv toploaders and muncie's they were replacing. The biggest problem we had was the crappy shifters that were available, always seemed to be out of adjustment. We switched to Long shifters and quit having shifter issues. The other thing, is the way they were assembled was kind of sketchy, if it had been gone through by a good tranny guy they were really nice to drive, either easy street or hard on it. The stock units seemed to be pretty balky on the syncros sometimes.

runawy9 wrote:3600 lb chevelle with small block around 400 horsepower, 4.11 gears, and drag radials. The engine turns around 6800 rpm. The low speed shifting is what I was concerned about. How would it act in traffic?


With this tranny, I think your first gear will be 3.25, with a 4.11 you will be using 2nd to leave in traffic. We used to recommend either 3.27 or 3.55 gears for street/strip use, the high ratio first gear will get you out of the gate pretty good, and the 5th is straight through, so freeway rpm is still comfortable.
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Postby henny496 » Sun Feb 24, 2008 9:27 pm

You can change gear ratios around quite a bit on them.not as much as other newer race trannies though
I have 3 complete trannies and intend to street/strip drive them. I have 2 Long inline shifters but I wish I had a Long H pattern for downshifting on the street (1 four speed, 2 five speeds)
A 39/16 first gives you like a 3.25:1 The 16 tooth cluster gears are apparently prone to breakage. I have a 38/17 which is a 2.98:1 I could go down to a 2.80:1 with the parts I have
The first one I am intially using is Doug Nash set up for a 4 gear, old Super Stock tranny with 3/4 face plate G force. That way I hope I only have to go to 3rd in traffic and down to 1/2 while stopped
I have a few friends who run them on the street, they are the ones advising me. Going to face plate gears will solve a lot of the problems
It is not in my budget this year to convert them though
Tom
get an adjustable clutch though if you are running a slick
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Postby ClassKing » Thu Feb 28, 2008 12:47 am

Doug Nash ran low nines with a 289 in his Bronco with one. Man......some screamin' 289 THAT was.
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