1966 Crown Coupe, 2016 200 S AWD, 1962 Lark Daytona V8.
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17,323 Posts
Has it ever had a fluid and filter replacement? ATF+4 is the required fluid for the NAG1 (W5A580).
It sounds like a clutch is applying too slowly and causing the shudder until it is fully engaged when the slippage stops.
Slow pressure build up may be from a restricted filter or foamy fluid (sometimes an air leak where the filter o-ring attaches to the valve body allows air to mix with the ATF). Sometimes the filter sealing o-ring gets left off or dislodged during a fluid/filter service. That 10-15 minutes would allow the pump to partially drain, but maybe not lose prime.
Low fluid could do this, but that would be more likely a cold problem more than a hot problem.
If you service this yourself use dipstick 9336A with a fluid level temperature correction chart. (It can vary ~1" per 100 deg F).
https://millerspecialtools.spx.com/Detail.aspx?id=847
It sounds like a clutch is applying too slowly and causing the shudder until it is fully engaged when the slippage stops.
Slow pressure build up may be from a restricted filter or foamy fluid (sometimes an air leak where the filter o-ring attaches to the valve body allows air to mix with the ATF). Sometimes the filter sealing o-ring gets left off or dislodged during a fluid/filter service. That 10-15 minutes would allow the pump to partially drain, but maybe not lose prime.
Low fluid could do this, but that would be more likely a cold problem more than a hot problem.
If you service this yourself use dipstick 9336A with a fluid level temperature correction chart. (It can vary ~1" per 100 deg F).
https://millerspecialtools.spx.com/Detail.aspx?id=847
