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North Carolina | Depends on what your main transmission is if you can find the tag it should tell you if it is an A or B. A is slow and B is fast transmision These trans will only split in upper range of main trans. If you have the type of 13 that has 3 ranges and you shift it like a 10 speed in upper 2ranges I'm not sure if those and be made into a "double over". I had a 87 freightliner with 400 cummins 125013B standard shift pattern 4.11 rears with 24.5 tall rubber. Turned the gears and made a horseshoe shift pattern creating double over only way I could use last gear was to be running on flat ground above 80 mph Just didn't have enough power to use it any slower Nice when I was empty or very light load on flat ground. Before I changed it over 80 mph was top speed @ 2300 rpm In my case the A main box would have been better in your case the 4.44 rears should help you if you make a double over outta it | |
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How much speed will I gain with a “double over” transmission?
