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#1
12-17-2013, 11:03 PM
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Stock 69 GTO Shudders On Takeoff
My 69 GTO (original stock 400, T400) sometimes shakes a bit when leaving a stop sign even at slow speeds. Car has a stock converter. But when I had a B&M Holeshot 2000 converter, it did the same thing. Not at every stop but like 2-3 times on a 30-mile round trip to work. This is a street car and like to keep it stock. Really feels like a converter issue. Engine idles smooth.
Any ideas? |
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#2
12-18-2013, 12:10 AM
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Does the tranny fluid look brown and smell old or varnishy? I have seen late model GM tranny's do that, and I think it is from the clutch's not holding good since it act's like a clutch chattering in a manual tranny car.
If the fluid is good, maybe it's a pressure issue. I'm certainly no auto tranny expert though, I'll be the first to admit that, although I have built one before.
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Paul Carter Carter Cryogenics www.cartercryo.com 520-409-7236 Koerner Racing Engines You killed it, We build it! 520-294-5758 64 GTO, under re-construction, 412 CID, also under construction. 87 S-10 Pickup, 321,000 miles 99Monte Carlo, 293,000 miles 86 Bronco, 218,000 miles |
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#3
12-18-2013, 07:25 AM
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Its eitheir trany rebuild time, or you have a flow restriction in the cooling lines, or the shift cable has come out of adjustment, or the filter is clogged.
I would carefully look over the cooling lines to the radiator for pinch points. If that checks then get a lenght of hose and two clamps and jump out the cooler section in the radiator to confirm there is no problem with that restriction wise. Does the problem get better or worse as the car gets driven? Does the trany shudder thet same way in reverse?
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
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#4
12-18-2013, 08:12 AM
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Don't know what trans. you have but does it do the same thing if you put it in manual low gear and start out and does it do it in rev.----BOB
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#5
12-18-2013, 08:53 AM
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Make sure your rear brakes are adjusted properly and free that can cause the same issues.
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#6
12-18-2013, 03:43 PM
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before diagnosing any tranny issue 100% make sure engine is good running order - no misfires
check motor mounts check tranny cross member
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69 Gto, 390 posi gears,th400 w/jim hand converter/406 pontiac/#64 HEADS/ 10:1 compression/ 190 PSI with/ TRW 160 thou domes / hooker headers 1 7/8, PRW 1.5 rockers, 405 Crower Springs, Holley 750 vac with proform upgrade, Performer RPM on points / 284 H Single Pattern Crane |
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#7
12-18-2013, 04:23 PM
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Check also the Harmonic Balancer.Any wobble=replace.
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#8
12-19-2013, 10:52 AM
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Reread your post and I must have missed it (400 trans.)----BOB
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