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Re: 1999 Chevy Suburban won't slow down.
It should not do that in manual D
The overrun clutch locks the forward sprag to give you engine breaking on the D range.
Drive highway speeds and pull the shifter down into 'D'. You should feel the deceleration. If it coast I would say the sprag is starting to go bad. If the sprag completely lets go you wouldn't be able to move forward from a stop but you could back up.
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My Classics:
'72 K20 Suburban + '65 Dodge Town Wagon
'72 Corvette Roadster +'67 Corvette Roadster
'73 Z-28 Camaro
'63 Ford SWB Uni Pickup
'50 Ford Coupe
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