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Technical Info: 2nd Gen 12 VALVE DRIVETRAIN Technical discussion of second generation (1994 - 1998) 12-valve engine and drivetrain questions, solutions and upgrades.
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  #1  
Old 12-20-2005
v8440 v8440 is offline
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Default Should I put nv5600 in place of nv4500?

Hi all,


I'm wondering if there's any real advantage to the 6 speed over the 5 in a truck that has a pretty wide powerband? I never feel like upshifting drops the engine out of where it's making good torque, so I dunno whether I ought to bother swapping. I plan on putting twins on this truck, so if the 6 speed is much better able to take the torque, that would be a consideration. How does the overdrive ratio compare between the two?

The reason I ask this now is that you can get clutches made to adapt the 6 speed to the 5 speed flywheel if I understand correctly. That being the case, it wouldn't make much sense to buy an expensive clutch for the 5 speed if I'm gonna just end up putting a 6 speed in anyway.
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1998 quadcab 5 spd 12v 2wd dually, SB 3250 dd sintered iron clutch, no plate, CPP 7 x 10 injectors, htb2 64-13 turbo, 4" exhaust, detroit locker, wastegate set at 50psi, internally stock and original motor, has run 14.67 at 98 mph granny shifting, dynoed at 450/920 on VERY stingy dyno in 4th gear.

2009 rcsb 2wd hemi truck, runs 13's stone stock
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  #2  
Old 12-20-2005
ScottRacing ScottRacing is offline
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Default Re: Should I put nv5600 in place of nv4500?

if you sell that 5 speed let me know. [img]/forum/images/%%GRAEMLIN_URL%%/wink.gif[/img]
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2002 2500 5 spd 4wd qcsb 75hp maxsticks and Airdog. Otherwise Stock for a little while

'94 Z28 11.1@ 128mph, 383 stroker, stock ported heads/intake, solid roller cam, 9" rear, 4.56s, stockish 6spd, all kinds of suspension, 8pt cage, still need to try the nitrous out! all work done by ME.
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Old 12-20-2005
v8440 v8440 is offline
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Default Re: Should I put nv5600 in place of nv4500?

Actually, I have two of them-the one in the truck, and the spare one in my shop that came with the truck. The guy I bought the truck from is a dealer tech, and he has managed to squirrel some good parts away, and some that need work. A good spare tranny and rear end were part of the deal. I know the rearend he gave me was good-after I broke the spider gears in the LS unit of the original D80, I put the spare in. No problems from it. What do good 4500's go for, and what do good 5600's go for? If possible, I'd like to unload both 4500's and get a good 5600, maybe with a little money left over.


*Edit* I just looked on ebay, and there are only two nv5600's for sale at the moment. One is supposedly reconditioned, and the starting bid is $1500. There are no bids on it, and the auction ends in a little over a day. That tells me that perhaps it's a bit overpriced, or maybe Christmas is the wrong time to try to sell stuff.
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1998 quadcab 5 spd 12v 2wd dually, SB 3250 dd sintered iron clutch, no plate, CPP 7 x 10 injectors, htb2 64-13 turbo, 4" exhaust, detroit locker, wastegate set at 50psi, internally stock and original motor, has run 14.67 at 98 mph granny shifting, dynoed at 450/920 on VERY stingy dyno in 4th gear.

2009 rcsb 2wd hemi truck, runs 13's stone stock
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  #4  
Old 12-20-2005
ScottRacing ScottRacing is offline
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Default Re: Should I put nv5600 in place of nv4500?

i've been looking at ebay too, and obvisouly the 5600 is gonna draw a lil more cash. i've seen the "reconditioned, full warranty" nv4500's go for 800 bucks, if the price is right, i'll go to the bank tomorrow. [img]/forum/images/%%GRAEMLIN_URL%%/wink.gif[/img]
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2002 2500 5 spd 4wd qcsb 75hp maxsticks and Airdog. Otherwise Stock for a little while

'94 Z28 11.1@ 128mph, 383 stroker, stock ported heads/intake, solid roller cam, 9" rear, 4.56s, stockish 6spd, all kinds of suspension, 8pt cage, still need to try the nitrous out! all work done by ME.
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Old 12-20-2005
v8440 v8440 is offline
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Default Re: Should I put nv5600 in place of nv4500?

I dunno what a right price is. I could sell my spare at any time, the one in the truck is fine also, but it's obviously in service now, so I can't let it go until I have a nv5600 in hand.

Back to my questions-do I need a 5600 for the power twins will make?
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1998 quadcab 5 spd 12v 2wd dually, SB 3250 dd sintered iron clutch, no plate, CPP 7 x 10 injectors, htb2 64-13 turbo, 4" exhaust, detroit locker, wastegate set at 50psi, internally stock and original motor, has run 14.67 at 98 mph granny shifting, dynoed at 450/920 on VERY stingy dyno in 4th gear.

2009 rcsb 2wd hemi truck, runs 13's stone stock
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  #6  
Old 12-22-2005
Cummins Express Cummins Express is offline
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Default Re: Should I put nv5600 in place of nv4500?

what do you do with the truck?? 4500's are tough SOB's and probably the finest standard to hit the market. 5600 stole their limelight, but they do have many drawbacks...one the are EXPENSIVE...both to buy AND repair. A 4500 you can tear apart on in the garage....a 5600 better go to the shop. They're pretty technical and the average mechanic can't mess with them. They also take all sorts of special tools. You can take a 4500, put the 1 3/8 input...billet if you like, and they're damn near bulletproof, but they're tough as they are. I know of several 1300 lb/ft trucks using them to sled pull with. I put the 13" conversion SB ConFE in mine and love it. When I converted from auto, I pondered the two and ended up going with the 5sp. Buy a good clutch and enjoy the rest of the money somewhere else.

Now if you haul for a living, the extra gear is a plus in the hills, but that would be the only reason I would spend the extra dough.

Answer? You bet the 4500 will hold up to twins no problem. I'm a week away from installing my compounds, and without worry. Any reman unit you buy...$1500 +/- will have all the good fixes for the ailments it suffered in the early years. Opt for a 98+ top cover and put in a BD short shift. Then they really get fun. My throw is less than 6 inches, and the gate is only 5 inches one side to the other...lots-o-fun!!
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'95, #100, 370's, 191's, no AFC, 19*, schwitzer/holset compounds, BOV, 40mm internal wastegate, gauges, pre-turbo & post IC 2 stage water/meth , twin 5" smoke poles, 35x12.50's....auto replaced by 4500 and SBC 13" conversion ConFE, BD short shift.
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  #7  
Old 12-22-2005
v8440 v8440 is offline
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Default Re: Should I put nv5600 in place of nv4500?

I guess mine has the '98 top cover, as the truck is a '98. I have to say, it hasn't given me any trouble yet, except I notice that the rattle you get at low speeds <1000 rpm has extended upward in rpm since I pulled the fema trailers.
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1998 quadcab 5 spd 12v 2wd dually, SB 3250 dd sintered iron clutch, no plate, CPP 7 x 10 injectors, htb2 64-13 turbo, 4" exhaust, detroit locker, wastegate set at 50psi, internally stock and original motor, has run 14.67 at 98 mph granny shifting, dynoed at 450/920 on VERY stingy dyno in 4th gear.

2009 rcsb 2wd hemi truck, runs 13's stone stock
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  #8  
Old 01-04-2006
FeelMeCummin FeelMeCummin is offline
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Default Re: Should I put nv5600 in place of nv4500?

the 4500 is a much stronger tranny. Get yourself an HMR input shaft and dual disc clutch from them. <a href="http://www.haisleymachine.com" target="_blank">http://www.haisleymachine.com</a>
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2000 Dodge Ram 2500 - Some Stuff

2003 Dodge Ram 3500 - All Billet HTS, Darkside Stage 4 CP3, Silver Bullet, Smarty, TST, FASS, RevD Custom Injectors, Custom Paint

Revolution Diesel Performance
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  #9  
Old 01-04-2006
gunracer1 gunracer1 is offline
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Default Re: Should I put nv5600 in place of nv4500?

1500 for a 5600 is a real good deal. they are expensive. i did the swap and to tell you the truth i wish i had just upgraded the input and mainshaft on a 4500. the 5600 shifts much slower than the 4500. the motor has plenty of power to haul with some bombs and twinned it will tow just fine.
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97 3500 ex cab 4x4 6 speed southbend dual disk and 450 or so rear wheel hp. 259k on the stock head gasket and the hx35.
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  #10  
Old 01-04-2006
Bramhabull Bramhabull is offline
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Default Re: Should I put nv5600 in place of nv4500?

<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">Originally posted by FeelMeCummin:
the 4500 is a much stronger tranny. </div></div>How do ya figure that?

The 5600 outweighs the 4500 by at least 150 pounds and is much better suited to this medium duty diesel engine. That being said, I dont care too much for my 6 speed, would rather have a 5 cause they are just more fun to drive.
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2001 3/4 ton Quad Cab 4x4 SWB - H.O. 6 speed SLT+, 295 Grabbers, Lund tonneau cover, SS nerf bars, winter front, high idle, Jacobs e-brake, Reese 15K hitch....

98 12V Quadcab SLT 4X4
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