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02-19-2013, 04:22 PM | #1 | |
AF Regular
Join Date: Aug 2004
Location: Farmersville, Texas
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Turbo-400 Trans Slips When Cold
70 Chevelle SS. When the trans is cold/cool, it doesn't want to shift into Reverse for several seconds, sometimes almost 30 sec. Then in Drive, slips/doesn't want to go very well. If you manually shift it into 1st/Low, it immediately starts whining, but will easily drive away. Then you manually upshift to 2nd, and same as in Drive/3rd, the RPM's come up, but not much forward push. (This is all with light throttle settings). If you drive it a few blocks in Low, then it suddenly begins working just fine.
Fluid & filter has been changed regularly/often, I even dropped the valve body, checked all valves, removed accumulator cover, reverse and (I believe) 2nd servo piston. All looks fine, ring is not worn bad at all, springs & balls all there, no varnish. New filter & fluid, even flushed converter. It was fine, and just kind of started doing this about a month ago. It does get driven fairly regularly, just not a lot of miles. Hate to pull and disassemble/reassemble the entire trans, even more if it still has the same problem. Like I mentioned, it is perfect when warm. Tried adjusting the fluid level up & down a pint at a time: +1, +2, then -1, -2. No change. THe whine is fairly loud in low, but when it warms up and starts acting normal, that sound goes away. Possible front pump? Or an other ideas? Thanks again! -Dan.
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-Jim 2015 Silverado Crew Cab 2500HD 6.6 Duramax 4x4 2002 Silverado Crewcab HD 2500 6.0 4x4 Sold 281K Great Truck 1970 Chevelle SS454 (Gave to my son 9 years ago for his 18th birthday. Yeah, I know, crazy, right? Thank goodness he doesn't drive it the way I would, -er, did...). 1971 Monte Carlo SS454 Drag Racer. The old girl finally got new paint! 1968 Camaro SS (New race car project). Caged, Tubbed, Back-Half/Ladder Bars. Rolling Chassis (For now). |
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02-19-2013, 06:43 PM | #2 | |
A990 racer
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Re: Turbo-400 Trans Slips When Cold
Youy have leaking internal seals, only fix is to do an overhaul.
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Ol'Jim (02-20-2013)
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02-19-2013, 10:13 PM | #3 | |
Confoundingly Lucid
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Re: Turbo-400 Trans Slips When Cold
Second vote for internal seals. It will only do this for so long before it no longer moves.
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1988 9C1 - Modified LM1 @ 275HP/350TQ - TH700R4 - 3.08 8.5" Disc Rear - see it at http://www.silicon212.org/9c1! 2005 Crown Vic P71 - former AZ DPS - 4.6 liters of pure creamy slothness! 1967 El Camino L79/M20 old school asphalt raper Remember - a government that is strong enough to give you everything you need, is also strong enough to take everything you have. |
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Ol'Jim (02-20-2013)
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05-12-2013, 09:52 AM | #4 | |
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Re: Turbo-400 Trans Slips When Cold
There may be a short term solution, but only short term. Transmedic has an additive that softens the seals. Lucas also has an additive that is more readily available. As I said, this may be a short term solution. An overhaul is inevitable.
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