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Old 05-02-2010, 08:22 AM   #11 (permalink)
vince99frc
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Are you saying the towing tunes on most programmers and/or tuning is possibly less than the LBZ/LMM stock for the older trucks? OR just because of the 6 speed they are better in situations like the grapevine or another hard towing grade?

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I don't think there is much difference between my LBZ (360 HP) and the LMM (365 HP). The LMM has 5 more HP and added emissions which probably negate the 5 HP, and a new body design. If it were an LB7 I might put a programmer on it, but IIRC they are 300 HP, have no cat, and pull well. My brother in law has an LB7 with the Banks 6 gun and 4" exhaust and can keep up with me on flat ground, and only slows a bit more than I do going over the Grapevine. I agree with LtEng5, how much power do you really need, and IMHO if you are climbing lots of hills you might be 5, maybe 10 minutes behind everyone else at the end of the day, and I would be happy with that.


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Old 05-02-2010, 03:08 PM   #12 (permalink)
Primed2win
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My 0.02.
For most people there is not going to be enough difference to justify upgrading to a newer truck.
The differences will show up when you push the truck toward its capacity.
This can be done either by towing heavy weights or climibing big hills.

Anyone that lives in mountain country will tell you that more gear ratios is a huge advantage when towing in the mountains. Until you done it you won't understand.

There are some mountain passes whereyour speed will dicatated by the terrain Ie. switchbacks that force your speed to be < 30mph. During those times your engine and tranny temps climb and your truck is working hard if you have alot of weight behind it.

Other hilly terrain will have slopes that have your truck looking for the correct gear. Ie 8% grade with 10K lbs behind the truck maybe fine in 4th on a NBS truck but 3rd is too low on a classic and 4th too high, because of less torque from the engine.

Like I said most people will never notice. If you tow frequently in the mountains you are dreaming of the days when the rumored 8 speed Allison will finally come out.

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Old 05-02-2010, 04:01 PM   #13 (permalink)
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I just hope the 8 speed Allison will fit in the older trucks and only require a computer change..

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Like I said most people will never notice. If you tow frequently in the mountains you are dreaming of the days when the rumored 8 speed Allison will finally come out.
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Old 05-02-2010, 04:08 PM   #14 (permalink)
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buy the 6 speed conversion from suncoast if you want 6 gears honestly they arent any different pulling and the 50 hp from oem isnt much.
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Old 05-02-2010, 04:14 PM   #15 (permalink)
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I just dont plan on purchasing another truck for a long time if at all. If I can keep my current up to date via not having any issues towing anything the newer trucks can tow I would be content. I do plan on upgrading to a built Allison one day. Just doing the usual research now. Hell adding another tranny cooler and doing the V2 might be all I need for the future, but I wont know until I start putting a load heavier than my cars behind my truck. I should know better when I drive to Cali later in the year to pick up my cousins 15klb boat and tow it back to Florida.

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buy the 6 speed conversion from suncoast if you want 6 gears honestly they arent any different pulling and the 50 hp from oem isnt much.
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Old 05-02-2010, 05:14 PM   #16 (permalink)
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mine will tow all day long at 12k i dont think you got any worry

hell ppl pull 15k with old psds gassers etc...there all capable might not tow as fast as brand new lmm but 50k price tag would empty your pocket alot quicker.
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Old 05-02-2010, 05:39 PM   #17 (permalink)
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My LLY doesn't miss 6th gear now that I put 265's on. My rpm at 65 mph is 2k which is the sweet spot. Would it be nice to have the LBZ for the 6th gear and no possible overheating issues. Sure, but mine pull great as is. Now the 2011 model is getting my interest... A lot of improvements.
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Old 05-02-2010, 05:55 PM   #18 (permalink)
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Quote:
Originally Posted by Chris_S View Post
I don't think there is much difference between my LBZ (360 HP) and the LMM (365 HP). The LMM has 5 more HP and added emissions which probably negate the 5 HP, and a new body design. If it were an LB7 I might put a programmer on it, but IIRC they are 300 HP, have no cat, and pull well. My brother in law has an LB7 with the Banks 6 gun and 4" exhaust and can keep up with me on flat ground, and only slows a bit more than I do going over the Grapevine. I agree with LtEng5, how much power do you really need, and IMHO if you are climbing lots of hills you might be 5, maybe 10 minutes behind everyone else at the end of the day, and I would be happy with that.
LB7s do have cats and egr systems depending on the emissions. AND let me tell you, the egr systems suck bad!
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Old 05-02-2010, 06:08 PM   #19 (permalink)
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X2 for Primed2Win.
I often tow my 9K 5th wheel over Monarch Pass, CO which goes 12000 feet. I use manual and keep the rpms at 21-2200. Those mountains are a long pull up and a long push down using the engine to brake. 30-35 mph is a standard speed around tight corners keeping control of your rig. Those 6 gears are appreciated and if you haven't pulled a trailer through a Rocky mountain pass you'll never really know what a great machine these DuraMax /Allison's are!
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Old 05-02-2010, 11:47 PM   #20 (permalink)
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Quote:
Originally Posted by vince99frc View Post
Are you saying the towing tunes on most programmers and/or tuning is possibly less than the LBZ/LMM stock for the older trucks? OR just because of the 6 speed they are better in situations like the grapevine or another hard towing grade?
I think the 6 speed has an advantage, but if I had the 5 speed it still does the job, and not worth trading up to a newer year. He always catches back up on the downhill side. IMHO I would rather own any D/A that is LBZ or prior. The LMM's are nice, but to much smog crap on them for me, and is just more to break. We both tow up a 13% grade for 11 miles every year, and his truck will pull it without any issues, as will mine. We both start at the bottom, and I will always make it to the top first, but the win isn't by much, maybe 60 to 90 seconds. I guess the question you have to ask yourself is, does the cost of a new truck really worth getting there a few minutes earlier than you do now?

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