Gears and tranny question - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 5 (permalink) Old 10-03-2017, 11:50 PM Thread Starter
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Gears and tranny question

Any one run a Rto 14615 with 390 years? What was top speed? How did it pull?
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post #2 of 5 (permalink) Old 10-04-2017, 12:14 AM
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Depends what you have it in.
With standard tires you'll run around 77mph at 1800 rpm.
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post #3 of 5 (permalink) Old 10-04-2017, 12:16 AM Thread Starter
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3406 b model.. it's a overdrive tranny with .78 final drive
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post #4 of 5 (permalink) Old 10-05-2017, 01:33 AM
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Eh, I thought it had the. 85 gear.
So around 81 per my calculator with 46" tires.
Try playing around Here
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post #5 of 5 (permalink) Old 11-02-2017, 10:38 AM
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Best money I ever spent on my truck has been replacing the rto14x15 with rtlo18918b. 15 speed is too big of a jump between direct and od. 3.70 on tall 24.5 around 96 at 2250 with .78 15. With 3406c either 60mph or 70+ and not much between if there was any wind. The old 15 was nearly bulletproof though. Spent about 400 bucks + oil changes in 1.5 mil miles.

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