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#1
03-16-2025, 08:10 PM
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Doug nash 4+1 race transmission torque rating
Just bought a Doug nash 4+1 race transmission for my 63 tempest gasser build. Will it live behind a 550 pounds of torque. Behind a 455
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#2
03-17-2025, 04:09 AM
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Is it cracked ?
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#3
03-17-2025, 05:54 AM
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No. They have a split case
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#4
03-17-2025, 02:46 PM
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I beat on mine with reckless abandon on street tires so far. Zero issues. 455 estimated 450 hp. Got it cheap enough from B man on the board years ago. I use the long shifter.
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#5
03-17-2025, 04:18 PM
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All depends on the ratios mainly first gear in it. Not sure if my old Richmond catalog has the TQ ratings in it I's look tonight. It does for their ST-10s. Back in the day you could give them the Nash serial number and they could look up what ratios it had. Mine was a "NHRA Stocker" so 4th and 5th were 1:1. I swapped out some gears and now 2.80, 2.22, 1.77, 1.33, 1.0.
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Skip Fix 1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever! 1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand 1965 GTO 4 barrel 3 speed project 2004 GTO Pulse Red stock motor computer tune 13.43@103.4-sold 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs 1964 Corvette Coupe 327 4 speed |
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#6
03-18-2025, 09:12 AM
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i have the richmond version in my 69 behind a healthy 455 and a 342 posi and drag radials. it is fine i think torque rating was in the 700ft lb range but that maybe selective memory
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1969 carousel red firebird 455, richmond 5 speed 1964 540 gto 1971 lemans sport convertible 1972 Maverick under slow construction |
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#7
03-18-2025, 02:49 PM
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If this is what use have. Fully Rated at 600 ft. lbs. of torque
https://www.richmondgear.com/wp-cont...hmond/RG22.pdf Stan
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Stan Weiss/World Wide Enterprises Offering Performance Software Since 1987 http://www.magneticlynx.com/carfor/carfor.htm David Vizard & Stan Weiss' IOP / Flow / Induction Optimization - Cam Selection Software http://www.magneticlynx.com/DV Download FREE 14 Trial IOP / Flow Software http://www.magneticlynx.com/DV/Flow_..._Day_Trial.php Pontiac Pump Gas List http://www.magneticlynx.com/carfor/pont_gas.htm Using PMD Block and Heads List http://www.magneticlynx.com/carfor/pont_pmd.htm |
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#8
03-18-2025, 08:04 PM
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That's it
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1969 carousel red firebird 455, richmond 5 speed 1964 540 gto 1971 lemans sport convertible 1972 Maverick under slow construction |
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#9
03-18-2025, 08:32 PM
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Thank you. Should be ok.
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#10
03-26-2025, 11:33 PM
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I broke one with my 300 ft-lb Stocker when I had the clutch set too aggressively on a radial prepped lane, so....
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#11
04-09-2025, 01:21 AM
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Those have a helluva 1st gear - what axle ratio are you running ?
Very stout transmissions (4+1) |
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