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Open Roads Forum  >  Tow Vehicles

 > GM 'o7classic LBZ dsl 6 spd to '21 L5P dsl 10 spd report

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SDcampowneroperator

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Posted: 08/13/21 06:29am Link  |  Quote  |  Print  |  Notify Moderator

Pricing was fair, bought from same salesman that sold me the . 07. Bed height is higher, had to raiise the pinbox 2 1/2" so have 4 1/2" clearance a little less than I like but still sufficient.
The b&w hitch is silent and positive, big improvement over the 16 k reese with rails it clanked rattled and unlatched once when I did pull test.
Had 190000 mi. on the LBZ probably 100 k of them towing camper or heavy work trailers.

Cummins12V98

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Posted: 08/13/21 09:50am Link  |  Quote  |  Print  |  Notify Moderator

You will love the B&W. Once you are comfortable with it you can skip the pull test and do a simple "visual test".

PinBox and hitch plates touching, handle closed and locked with jaws closed around the kingpin you are good to go. Of course this is a personal decision.

I would be very concerned with 4.5" of bed clearance. Time to do a little fabricating on the RV's suspension.

If you don't have one get B&W's 1/8" slip plate as it will make unhitching easier.


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ksss

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Posted: 08/13/21 08:41pm Link  |  Quote  |  Print  |  Notify Moderator

I agree on the 4.5 inches of clearance. I have 9" on my toyhauler and sometimes it comes very close to hitting when going over rough ground. Toyhauler life is rougher than regular RVing but 4.5" isn't much room for error in the roadway.


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larry barnhart

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Posted: 08/13/21 08:51pm Link  |  Quote  |  Print  |  Notify Moderator

bob213 wrote:

I have an 05 with 45K miles. I don't really need a new one but I've been bitten by the "new truck bug". I can't find what I want so I think I will have to order as well. I just need to get over the sticker shock. ENJOY your new truck!!!



We have an 05 chev duramax with 114K miles and still feel I am driving a new truck. We could drive a new truck but why?

chevman


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SDcampowneroperator

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Posted: 08/13/21 10:11pm Link  |  Quote  |  Print  |  Notify Moderator

4 1/2" sounds close, its not an issue in a dip it is in an hilltop. What we in pipelining called an overbend, vs sag.
The tailgate to overhead of the 5er contact with a 8' bed would mean a 20% overbend hill top I agree, not ideal , unlikely. avoidable. Raising the 5er is an option, that adds even more complications.

Grit dog

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Posted: 08/14/21 05:23am Link  |  Quote  |  Print  |  Notify Moderator

larry barnhart wrote:

bob213 wrote:

I have an 05 with 45K miles. I don't really need a new one but I've been bitten by the "new truck bug". I can't find what I want so I think I will have to order as well. I just need to get over the sticker shock. ENJOY your new truck!!!



We have an 05 chev duramax with 114K miles and still feel I am driving a new truck. We could drive a new truck but why?

chevman


Right on Chevman!
Of all the mid 2000s diesel pickups, the GM is on par or maybe preferable and the drivetrain is the best hands down total package.
Your LLy I think you can program in a turbo brake as well.


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ksss

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Posted: 08/14/21 12:55pm Link  |  Quote  |  Print  |  Notify Moderator

If your not pulling as heavy I don't know that it matters as much, but pulling heavy the reasons to upgraded are pretty apparent.

corvettekent

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Posted: 08/14/21 05:23pm Link  |  Quote  |  Print  |  Notify Moderator

After reading your post and stopping by my local Chevy dealer I'm thinking about ordering a new 2022 Chevy 3500 SRW with the Duramax.

So I assume that you had to get a new B&W companion hitch? Is the height of the new truck and the old truck similar?


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noteven

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Posted: 08/14/21 05:50pm Link  |  Quote  |  Print  |  Notify Moderator

Are the new GM diesels only available with the 10 speed powershift transmissions?

Why would a 10 speed be needed behind a diesel in a pickup annyways?

Behind a gas engine yes.

SDcampowneroperator

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Posted: 08/14/21 07:08pm Link  |  Quote  |  Print  |  Notify Moderator

I didnt have to get the B&W hitch from chavy, There are other aftermarket hitches to get or install yourself. I have a welding shop, considered making my own mounts for some other brand, the math for savings just didnt add up.
The 4 puck system is easier for install and removal than this goose ball socket mount as the 4 puck doesnt require any wrenches, is lighter and lifts freely. To remove the Companion takes a chain hoist or pry bars and a buddy.
I am not a fan of the bed height, I' m 6' , trim and in good health, but it takes a step to reach in to work the hitch or any cargo. I now carry a 3 step folding step. A milk carton used to be plenty.
Trannys were huge improvements for any engine, my first was a pontiac 2 spd behind a 389 super duty in a '65 GTO. Gearing allows tighter shifts, locking converters, lower rpm at lighter loads.
In the early '70s I drove farm grain trucks with 318 detroits with 15 spd. roadrangers and Macks with 4x 4 16 spd.
Regardless of engine the reason is to keep the machine in the power band at its most efficient for the task. Thats why I reported that the new truck only shifted down into the next best gear to maintain that torque , same as a semi driver would do.
The LBZ with its 6 spd was a great improvement over our '98& '03 4 spd behind the troubled GM 6.5 s
Heres another new tidbit concerning gearing and mileage. The new truck with 3.42 diff. and 18" wheels has the dmax spinning at 1275 rpm @ 60 mph.
The '07 with 3:73s and 16" tires spun at 1500 rpm @ 60 mph
Many times I monitored fuel mileage, empty, loaded, heavy, into head wind or with a tail wind. I now have done enough of that to report the new truck is 5-15 % more efficient on fuel than the '07. I attribute a lot of it to the tranny. I recently attained a 21.7 mpg 100mi. rd trip that the '07 old trucks best was 19.3 with 10 % city, 90% 55- 65 speed zones with lots of hills.
My Pappys 1977 3500 454 gassers 3 spd. best was 11. 5.5 towing 12k

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