Transmission Change
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New User
Joined: Mar 2007
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Transmission Change
My 4.9L is mated to a 3 speed automatic transmission and I wanted to swap it out with a 4 speed automatic. Does anyone know if that is possible or is the 4 speed only able to connect to a V-8?
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New User
Joined: Mar 2007
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The only reason I was considering swapping out trannys is because sometimes I have to hit the highway and do 70 and the RPMs are in the high 3k range and I was thinking I might get better gas mileage with that extra gear.
Elder User
Joined: Feb 2004
Posts: 909
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From: San Luis Obispo, CA
Correct info on the bell-housings, but remember the V-8's are externally balanced and the I-6's are not. No problem, with the trans & bellhousing, but be certain to get the right flywheel/flex-plate for your type of engine. If you have a V-8 flex-plate, you probably could just cut off the balancing weight - I think it is just spot-welded on. (Whatever holes this process creates should be duplicated exactly on the opposite side of the flex plate to maintain balance.)
