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2000 Volvo 3:42 rear 13a

2000 Volvo 3:42 rears 13 speed trans 22.5 lp tires 390 hp cummins n14 13th gear is to high and week but 12th gear is to low 54mph @13.5rpm should I go with a 18speed and if so which model and I would like to run in direct drive or should I regear the rears I like running at 58 mph thxs pete

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The 18 speed won't change anything, the top 2 gears are the same as the 13. If you want to run in direct I would recommend 2.79 gears.

RPM @ 58mph

11th gear - 1380

RPM @ 67mph

12th gear - 1380

RPM @ 77mph

13th gear - 1380

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These would be great specs! I'm finding that my n14 loves 1400 rpms and it seems nothin else will do according to scan gauge KR.


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Is your engine maxed out at 390 or can you have reprogrammed for more HP and torque?

Cheaper than a tranny or gear swap.

I have the same specs., but had mine reprogrammed to 500hp & 1850 on the torque. Mine runs really well at 1410 and 67mph. If I can I usually hook up with a Swift truck and follow him at about 62mph and get 9-10 mpg.

Reprogramming takes less than an hour, about $100, depending on where you take it.

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I know it goes against the conventional wisdom but whay not try going to 11r22.5 regular tires? That would gain you about 7% in road speed at the same engine RPM's. Wouldn't cost that much especially if the tire dealer would let you get a used set for a trial period. Try working a deal to demo a set for a month or so.

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strousejo will be eternally grateful.
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