c6 auto swap to ???
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c6 auto swap to ???
Hey, i wanting to swap out my c6 trans on my 88 f250 7.3l at 55 im at about 2500rpm and as a student fuel milage is a slight issue, what would be the best manual or auto swap to get my rpm down?
Postmaster
Joined: Aug 2010
Posts: 2,554
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From: Northern Arizona
Your rpm's show you have 4.10 axle gears. If your truck is 2wd then a rear axle swap to 3.55's would be a cheaper way to get your revs down some, but honestly 3.55's AND an overdrive transmission is what will put you in a happy place for fuel economy. 4x4's are a lot more expensive and complicated to re-gear. As stated, if this is all about pinching pennies at the pump, it will be hard to recover your investment. If you plan to keep the truck a long time and you can afford to improve it then sure, trans swap is one of the best things you can do to it.
Fleet Mechanic
Joined: Oct 2012
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If MPG is the main goal the regearing and a zf5 would be the best. An e4od will give you overdrive and a locking torque converter, both of which your c6 doesn't have.
How much of you driving is city and how much is hwy? I would suggest doing the savings math before you swap anything. Back when fuel was $4 a gallon I installed a DNE2 and low stall converter in my c6/3.54 combo. With the amount I drive and $4 a gallon it would take me a little over a year to recupe the investment. With the drop in fuel prices, now it is between 2-3 years. I plan on keeping my van for a lot of miles and the noise reduction/gear splitting benefits were also of great value to me.
How much of you driving is city and how much is hwy? I would suggest doing the savings math before you swap anything. Back when fuel was $4 a gallon I installed a DNE2 and low stall converter in my c6/3.54 combo. With the amount I drive and $4 a gallon it would take me a little over a year to recupe the investment. With the drop in fuel prices, now it is between 2-3 years. I plan on keeping my van for a lot of miles and the noise reduction/gear splitting benefits were also of great value to me.
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