A904 sluggish acceleration in drive - Transmission Problems


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A904 sluggish acceleration in drive

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kmars68
New User

May 20, 2010, 1:04 PM

Post #1 of 3 (2234 views)

A904 sluggish acceleration in drive	Sign In

1978 Dodge Aspen 225-6 a904

When I put in Reverse it works fine but when I put it in drive it has very sluggish performance. I thought it was the brakes grabbing at first but eleminated that. Replaced radiator about 2 months ago. tranny was rebuilt about 3 years ago with low miles (3000 miles).

Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

May 20, 2010, 3:55 PM

Post #2 of 3 (2226 views)

Re: A904 sluggish acceleration in drive	Sign In

Try manually pulling the shifter down to 1st gear and see if that makes a difference.

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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.

Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

May 20, 2010, 10:00 PM

Post #3 of 3 (2223 views)

Re: A904 sluggish acceleration in drive	Sign In

1978 Aspen 225! Like the show "Cats" - Memories...........

Seemed like everyone I knew bought one of these back then. Near all had carb issues difficult to overcome and would starve for fuel like an under pressure/volume fuel pump.

Weak spots I recall were carb base gaskets, intake to manifold leaks and the carbs. Smile, gutless wonders and wicked fuel pigs but wouldn't quit with a hand grenade thrown underhood!

Some solutions that helped were raising idle 100 RPM over spec and eliminate any sign of vacuum leaks. Other hit or miss may-bees with some miles were timing chains, nobody ever adjusted those mechanical lifters on a schedule, distributor gear but that was run or not,
ballast resistors, brushes in alternator (actually on outside!) and voltage regulators.

Hated to play with OE specs but advancing timing just a tad, the idle and depending on what carb is on it now if adjustable make the accelerator pump a bit faster to apply extra fuel. This was an issue with the late "slant six" in cars and as I recall less issues when used in the trucks,

T

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