hi im new to this forum. i have an 89 pete 3406b 15sp 355 rears. i haul sheet rock from central pa to ny nj ct. 52,000 lbs. last weekend i change the 15sp out for a 13sp. i bought the 13sp from a freind who pulled it from a cabover with a 3604b. he never ran it so he couldnt tell me much about it so i had my mechanic over haul it and everything look great. i asked my mechanic about "flipping the gear" and making it a double over aqnd he told me it wouldnt be needed because the truck would run to fast and lose to much power. the truck used to run 65mph at 1525rpm. i picked it up monday morning and it now runs 65 at 1725rpm and my fuel milage has dropped. is there anything i can do to fix this with out having to buy another tranny?
thanks. jeff
new transmission regrets.....
Discussion in 'Peterbilt Forum' started by skoj89, Jan 14, 2012.
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Why did you do the switch in the first place ? The ratio on the top end it different on a 15. Your B model should of had plenty of torque to handle your 15, Driver's believe that splitting the gears on a 13 has their advantages, it might if your constantly pulling hill's but your sacrifice on flat's like yourself. I have a 13 and I dont split the top on gears most of the time. I know many buddies that prefer a 15 and will replace there 13 when it explodes. I prefer my 13 and wish I had 3:55's or 3:33's, or should I say I will get that ratio when my rear's explode. At 1400 rpm's I run about 58 on the top end, and again I live in the great state where 55 mph rules
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I've ask the same question to my trans shop few years back and said it was impossible without doing internal switch. It can only be done on a 10. If your right Hammer Im going back and do #2 on your list.
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