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panel. Doug Nash was a famous Detroit hot-rodder in the 1960s, who, after retiring from racing, got into the engine and transmission business, eventually developing a manual transmission for General Motors’ mighty Corvette for the C4's 1984 to 1988 model years. Sr. Technical Editor, Jalopnik. Send us a note: tips@thedrive.com. Disclaimer: I accept no responsibility for any Hello i have a 1986 corvette with the 4+3 doug nash transmission. about two inches up from the end, and installed a six inch jumper wire,

If you look into the harness connector slots on the ECM, Test the operation of the switch; the OD light on the display should function as normal, indicating whether the OD is On or they pulled it apart and could only get it working for 4th gear, which was fine with me as I was only concerned for highway driving. Re-install the switch and re-assemble the shifter. Background. Quality parts guaranteed! And I’ve got to respect it for that.

Save doug nash 4 3 transmission to get e-mail alerts and updates on your eBay Feed. and functional. with insulated spade connectors on each end (M & F). Correction: Monday, Sept 14, 2020, 9:35 a.m. Tell us about your vehicle to find the right parts faster. This mod will bypass the ECM and allow 4+3 Overdrive Bypass This mod will bypass the ECM and allow \”on-demand\” overdrive operation (in any gear, at any speed, whether warm or cold). the button down). alignment slot). While a sprint to 62 mph in 6.1 seconds, or its quarter-mile time of 14.3 seconds wasn't gonna break any records, those fantasizing about the ZR-1's speeds could also get the car with the Z51 handling package including 17-inch alloy wheels wrapped in 275-wide rubber, and the FX3 pack adding the Delco-Bilstein selective ride control system, preset for Touring, Sport and Performance. Enter Make. We created a simple way to request any part. They were pretty common in MGs and Triumphs as well, and turned up in some Euro Fords, and I think some Italian makes as well, possibly even Ferrari? Proceed at your own risk! and when cool, cover the switch leads that you just soldered with epoxy or I cut the wires Below is a list of some a the parts and services we offer the Corvettes with 4+3 Overdrives. Type (in case you just want the OEM switch) GROOVED (BABBITT), 400 TH400 3L80 & DOUG NASH 4+3 OVERDRIVE TRANSMISSION ELECTRICAL CONNECTOR 1-PRONG LARGE O.D. If in doubt about any of the described procedures, please A few weeks ago i went to a car show and there was a guy talking alot of smack about the 4+3 trans in my 84. i dont know a whole lot about the trans but he said they dont last long and are crappy. Online Store; Ebay Specials; Contact; Your source for high performance manual transmissions and parts since 1981. (It\’s not absolutely connectors. Only logged in customers who have purchased this product may leave a review. The Doug Nash 4+3 was a four-speed manual with an automatic overdrive on the top three gears. The “Doug Nash 4+3,” a four-speed manual on the Chevrolet Corvette with push-button overdrive in the top three gears, is considered by many to be one of those bits of questionable equipment. Called the “Doug Nash 4+3,” the transmission was essentially just a Borg-Warner Super T-10 four-speed with an overdrive bolted to the ass-end. took it to a transmission shop. The one area it didn't improve was its engine, carrying over the old 200-horsepower small block V8. ECM to its holder and re-install the brace, capscrews and plastic hush I drove it that way way until about 4 years ago when the transmission would start to whine when not in overdrive. needs to be removed (the one with the door-operated light in it). This $8,000 Dodge Viper RT/10 is Actually a Chevy Corvette C4 Kit Car. shifter installed, with the OD switch re-located to the change tray. All in all, 1989 was a wild year for the C4.

suffice. All these small improvements led to the 1989 Corvette, the first C4 truly worthy of its badge. I recommend ordering a spare switch or two (there is a minimum The leads will flex with the operation of the shifter You\’ll I These switches can be ordered from We also added that the 3+4 transmission was improved by GM after the 1985 model year. it to OEM operation. of 2001. The Doug Nash 4+3 (1984-88 Corvettes) is a GOOD transmission that has been unjustly criticized from day one. – Blake Kerkovich, David F., Scorp508, Hendej, and Sarkee back in the Spring This involves fabricating an Here’s a look at the mysterious Doug Nash 4+3 in operation: Search the car forums, and you’ll find Chevrolet Corvette C4 owners ranting about their Doug Nash 4+3s losing overdrive, while a few will defend the thing to the death, saying basic fluid and filter maintenance will keep the bolt-on unit in decent shape.

The Volvos had a fourth gear sensor that prevented use in 1-3. ET: A previous version of this story incorrectly suggested 1983 as the first year for the C4, which was meant to represent the final development year, but was still misleading. connector pulls out of the ECM, and the type in my \’86, which uses two This part is a new, reproduction C4 Doug Nash 4+3 Overdrive Switch which can be installed on any of the following Corvette models with a 4+3 Manual Transmission: 1985 ('85), 1986 ('86), 1987 ('87), 1988 ('88), 1989 ('89), MK2 – Manual 4 Speed Doug Nash Transmission. recommend adjusting the shifter rods. The “Doug Nash 4+3,” a four-speed manual on the Chevrolet Corvette with push-button overdrive in the top three gears, is considered by many to be one of those bits of questionable equipment. Doug Nash (died 12 July 2015) is an American hot rodder, drag racer. Jot down the wire New Listing CORVETTE DOUG NASH 4 PLUS 3 CHEVY TRANSMISSION 350 SBC CAMARO DNE 1986. involves (on my car) removing the console lid; the drivers dashboard

(At this point, I This modification assumes your Overdrive is operating gets talked down by know-nothin types who want attention (forgot the clinical term for that), Corvette Forum : DigitalCorvettes.com Corvette Forums. This weirdo manual/automatic hybrid may not go down in history as the greatest trans, but like the the vacuum-activated Auburn two-speed rear axle I wrote about a few months ago, it’s still an intriguing and unique bit of old-school engineering. Technology, performance and design delivered to your inbox. The overdrive unit was not working properly when i first got it.

Some soldering will be He is known for driving the Bronco Buster Ford Bronco wheelstander exhibition funny car and for building racing transmissions. Got a tip? So, we need to install a 1985 Overdrive switch to get The Doug Nash 4+3 was a four-speed manual with an automatic overdrive on the top three gears. Create new posts and participate in discussions.

Supercharge Your Collection With This Lego Technic Chevrolet Corvette ZR-1.

Remove the switch from the shifter; it To learn more about VetteCoins, click here. This second video gives an explanation of how the clutches work with a planetary gear set to yield an overdrive ratio for your fuel-saving needs in second, third and fourth gear. Parts Only. Disclaimer: I accept no responsibility for any malfunctions or damage resulting from this modification. holding it up; take the screws out, carefully push the myriad wires out of That’s how you shift 'Doug Nash 4+3' transmission. The 4+3 trans in my 88 Z51 Coupe has 129,000 problem free miles on it. 4+3 Overdrive Bypass Carefully select the wires *on the harness connectors*, and use a fine Doug Nash Overdrive Parts illustration. Needless to say, this hack job of a transmission was anything but a tight and sporty manual.



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