C6 life expectancy
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Cargo Master
Joined: Feb 2009
Posts: 2,111
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From: Yreka, CA
C6 life expectancy
I've been watching the 4r100 and torqshift life expectancy threads in the SD/HD area and thought it'd be interesting to see what kind of mileage people have on their C6's. I'm at 127k and it still shifts nice and crisp.
Tuned
Joined: Aug 2004
Posts: 269
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the one in my '86 F250 HD saw landscaping duty since it was new (pulling a trailer 5/6 days a week and plowing snow for 50 residential accounts every storm). the trans finally screamed mercy in 2006 when it didn't want to go into gear anymore. so 20 long, abusive, hard years. than i had it rebuilt with a shift kit and high performance torque convertor. its good for at least another 20 now.
Posting Guru
Joined: Feb 2007
Posts: 1,006
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The C6 in my '94 has almost 144,000 miles on it, it shifts firm and has never had any slipping issues. The only work that has been done to it is fluid/filter changes, a new vacuum modulator, and a B&M RV/HD shift kit. My grandfather put 120,000 on the truck before I got it from him almost 3 years ago. He put between 75,000 and 90,000 of those miles on it towing a 28 foot fifth wheel (about 9,000 lbs.) and later a 30 foot travel trailer (also about 9,000 lbs.). Lacking overdrive is a bummer, but it shifts tough, dosen't slip, and it keeps going and going.
Senior User
Joined: Nov 2008
Posts: 113
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From: Western NC
Since I tow with my c6 I added the B&M shift kit with the RV setting. The 1-2 shift is so jarring that I'm afraid I will break u-joints. Last night I pulled the valve body off to put it back to stock. How hard does yours shift? My transmission was swapped with a replacement just before I got my truck, is it possible they did other upgrades to the internals?
For me one of the selling features of my truck was the c6 transmission. They are very rugged transmissions. They are also very cheap, rebuilt units are under $1k if you needed one. Looking inside them I think I'd try to rebuild one myself since they are mechanically simple compared to the newer ones. The aftermarket also has many options for these units as well. Another downside not listed here is that the torque converter doesn't lockup, so fuel economy hurts due to that as well.
For me one of the selling features of my truck was the c6 transmission. They are very rugged transmissions. They are also very cheap, rebuilt units are under $1k if you needed one. Looking inside them I think I'd try to rebuild one myself since they are mechanically simple compared to the newer ones. The aftermarket also has many options for these units as well. Another downside not listed here is that the torque converter doesn't lockup, so fuel economy hurts due to that as well.
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