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Shifting an 8LL overdrive

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Uploaded by on Oct 26, 2007

Running up a 400 big cam with a 8LL overdrive trans. Please note the strange shift pattern.

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Autos & Vehicles

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Uploader Comments (ickycan)

  • If the model of this rig is either an S/F-2574/75 or S/F-2674/75, the original Cummins engine was likely an NTC-350 Big Cam, and was upgraded to 400 hp in the later years of the fleet. (F = tandem axle; 4 = straight truck; 5 = Severe Service tractor.)

  • Yup you nailed it! The 350 let go on a very cold start about 2 years ago. It has a "few" other upgrades ...

Top Comments

  • Good ole 8LL, thats what I've been driving for 5 years now, steady shifting on hills but a reliable transmission...and yes, its the (rto) meaning the 3rd and 4th, and 7th and 8th are backwards....I love it on my '88 international s2600 L10 cummins!!

  • The 1st time I drove one of those U shaped pattern I was grinding gears untill I figgured it out. LOL

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All Comments (26)

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  • i have a video of me driving the same shift pattern in a 1993 autocar (ACL66) its an all wheel drive model that we use in the USN Seabee's down in gulfport, MS. its definitely a fun truck to drive, great video tho, my phone did a horrible job of capturing that!!!

  • O_O

  • @chris1422 I had these all figured out, but I thought all 8LL's were this way. So I jump in a "standard" pattern 8LL equipped truck and can't pick a gear to save my soul. had to pull over and look for the pattern. LOL

  • what is the top speed of this beast.

  • Thanks for posting this. One of my garbage trucks has the same shifting pattern (minus overdrive). For me, the hard part is remembering that I'm driving the RTO truck instead of one of the other trucks.

  • @hondarider100r only in 1st in low range

  • that shift pattern looks difficult. lol.

  • I hauled bulk milk for approximately 29 years and one of the best companies I worked for, ordered most of their FPU/Road trucks with the 8LL trans. I really got to like it for the most part but after driving a CH Mack with an 18spd, I would say that is the tranny I would have if I ever were to return to driving. (I retired 7 years ago on Disability). I liked the fact of being able to split gears even in the low side which worked great for farm pickup!

  • The low reduction is only used in Low gear. A 15 speed uses low reduction in all low range gears

  • in the 8ll deep reduction is only used in low ? or bottom range gears?

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