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2004 Pontiac Bonneville swapping transmissions

Tiny
NOTAPROMIKE2
  • MEMBER
  • 2004 PONTIAC BONNEVILLE
  • 3.8L
  • V6
  • FWD
  • AUTOMATIC
  • 140,000 MILES
I want to swap transmissions from a parts vehicle to my 2004 Bonneville. My 04 has a slightly different gear ratio (FQ3, 2.86). The tranny I am about to install is the F83 with a 3.05 gear ratio. They both have codes MN3 and L36. Will this cause any problems? The parts man at a dealership thought it may mess up the computer and encouraged me to get the exact match. Is this necessary? Will it fit and work properly if I make this swap? Thanks. Notapromike
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Tuesday, May 20th, 2014 AT 7:43 AM

1 Reply

Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
Yes, it will mess things up somewhat. Speedometer will be wrong. Fuel mileage will suffer. Trans may not shift at the right time. The computer was programmed to a different ratio so the computer is going to have specific responses at specific RPMs and that is going to be all changed.
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Tuesday, May 20th, 2014 AT 8:49 AM

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