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  • 1996 - 2004 SN95 Mustang -General/Talk-
  • SN95 4.6L Mustang Tech

00 4.6 engine swap question

  • Thread starter Thread starter RedondosTires
  • Start date Start date Apr 25, 2011
R

RedondosTires

New Member
Mar 1, 2011
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Gardena
Apr 25, 2011
#1
  • Apr 25, 2011
  • #1
A buddy of mine had a question so I cam on here for some help..
He is working on a 2000 4.6 automatic, got a used engine from a 2000 manual. The car was shaking during decel. He figured there was something wrong with the used engine or maybe it wasnt compatible but couldnt find one off of an atomatic so he got another one from a manual car. The car is still shacking during decel but significantly less but still more than normal.
I'm pretty sure the engines from an automatic and a manual are the same but can anyone confirm this? Also any ideas of what can be causing the whole car to shake during deceleration?
 

fast97gt

Active Member
Jan 2, 2007
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north carolina
Apr 25, 2011
#2
  • Apr 25, 2011
  • #2
did he pull the pilot bearing from the back of the crank?
 
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RedondosTires

New Member
Mar 1, 2011
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0
Gardena
Apr 25, 2011
#3
  • Apr 25, 2011
  • #3
fast97gt said:
did he pull the pilot bearing from the back of the crank?
Click to expand...

Not sure, Ill ask him and get back to you later
 

wmburns

SN Certified Technician
Aug 14, 2009
5,892
514
204
Houston Texas
Apr 25, 2011
#4
  • Apr 25, 2011
  • #4
RedondosTires said:
Also any ideas of what can be causing the whole car to shake during deceleration?
Click to expand...
As others have said, the motors ARE the same. The only difference is the flywheel/flexplate and pilot bearing.

As for the shaking, here are some things that come to mind:

  • Automatic transmission torque convert not fully seated on the transmission input hub. Should be two definate "clicks/clunks" as the torque converter is installed. Also turning the motor backwards can un-seat the torque converter.
  • Motor mounts
  • transmission mounts.
  • U-joints
  • Drive shaft runout or out of balance. Was the drive shaft indexed before removal?
  • incorrect pinion bearing pre-load.

Note, if the torque converter is not fully seated, this will quickly ruin the motor from excessive load on the thrust bearing. As fast97 has stated that if the pilot bearing was not removed, then the TC will not fully seat inside the crank. This will cause the crank to push back on the TC. This in turn will wear out the motor's bearing from excessive load on the thrust bearing. Don't ignore this.
 
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