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#1
05-13-2020, 10:01 PM
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Convertor help
Hey guys,I have a 69 bird with a stock350 as far as it sounds and a 400 trans. Issue is when I put it in gear reverse or forward it bangs hard and trys to kill the motor. Does it sound like it needs a better convertor ? I have no idea what is in it as I bought this way. What stall speed would be recommended for street only so it will idle in gear.
Thanks in advance
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Steve Thomas  Dallas, GA 1950 Chevy truck red/original drive train 1967 Camaro SS silver w/black stripes 8.91@153mph 1969 Camaro SS 350 white w/black stripes 1971 Firebird 350 matching #'s white/blue int. 1975 Trans Am Blown 509 blk. 1975 Trans Am 400 matching #'s silver,loaded 1979 Trans Am 301 matching #'s,black 1980 Trans Am 301 matching #'s,t-tops,blue 1982 Mitsubishi drag truck 383 sb runs 9.92@ 133mph |
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#2
05-14-2020, 02:22 AM
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A stock 350 engine should get along fine with a stock converter. What is your idle speed? If it is 700 RPM or lower I would be suspicious of the converter going bad.
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Mick Batson 1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 2+2 survivor AC auto -- 1965 Catalina Safari Wagon. |
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#3
05-14-2020, 08:21 AM
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First thing to do is check the timing. Likely someone installed a distributor spring "kit" at some point and timing is falling off some when the engine is loaded at idle speed (trans placed in gear). The timing mark MUST NOT MOVE in and out of gear or you will experience the exact issues you are seeing here......Cliff
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If you can read this, thank a teacher. If you can read this in English, thank a Veteran! https://cliffshighperformance.com/ 73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile), |
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