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727 Transmission Shifting Problem

Started by MOPARHOUND!, August 10, 2007, 01:54:05 PM

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MOPARHOUND!

August 10, 2007, 01:54:05 PM
Bought a 69 Dodge D200 truck recently.  It has a 383 and an auto trans.

You you have to start off in 1st, get up to 15-20, and bump the shifter to Drive, and it will make the 2nd to Drive shift on it's own. Coast back to a stop, and truck will set there whirring in Drive, going no where. Put it back in 1st, and off you go again.

Any ideas?

I also think my driveshaft isn't correctly seated in the trans, with 3 inches exposed of the yoke shaft:

1971 Charger R/T, 440 H.P., Auto, A/C Daily Driven (till gas went nuts).  NOW IN CARS FOR SALE SECTION: http://www.dodgecharger.com/forum/index.php/topic,48709.0.html
1969 Charger 318/Auto (latest addtion): http://www.dodgecharger.com/forum/index.php/topic,31948.0.html
*Speed costs money son, how fast do you want to go, and for how long?"
*"Build the biggest engine you can afford the first time."
*"We normally wouldn't use a 383 for this build, parts and labor for a 440 cost the same."

aifilaw

#1
August 10, 2007, 02:10:16 PM
sounds like a broken band, but I'll bet kunkel will chime in since he knows.
Your right, I bet half the spline is not on the drive shaft.
'72 B5 Metallic Blue Hardtop
426" Wedge - Hydraulic Roller Stealth heads

John_Kunkel

#2
August 10, 2007, 04:40:36 PM
Sounds like the trans has lost the overrunning clutch (sprag), the whirring is the chunks of the rollers spinning around. Shifting to low applies the rear band which takes the place of the failed sprag. Whatever you do, don't use heavy throttle; a failed sprag is what can cause the trans to explode if over-reved.

Here's what a failed sprag looks like:
Pardon me but my karma just ran over your dogma.
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