Swapping from a NP445/NP435 to a NV4500 questions
#2468427
03/19/18 01:30 AM
03/19/18 01:30 AM
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Joined: Aug 2004
Posts: 3,310 Walnut Creek, CA
blown340
OP
master
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OP
master
Joined: Aug 2004
Posts: 3,310
Walnut Creek, CA
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Hi All, I currently have a NP445 in my 73 W200 with a 318 and a divorced NP205. The NP445 is just the close ration version of the NP435. I am going to be swapping to an NV4500 to gain an overdrive. The transmission I have is a 97 chevy short tail shaft 2wd trans which has been converted to a dodge 10 spline magnum style input shaft. I'll be using the hydraulic bellhousing setup from a 1995 small-block magnum ram. Questions: Will I be able to reuse my flywheel if it's in good shape? If I need a new flywheel, are the magnum 318's internally balanced like my 73 motor, or are they externally balanced like older 360's? Looking at replacement flywheel's and clutches they seem to be available in 11" and 12". Will both sizes fit in the stock bellhouing, and if so which one is better to use? Does anyone have any pictures of the tranny crossmember used in the 1992-93 NV4500 trucks? Will this work with my short chevy tailshaft? Or am I better off just fabricating something? Thanks, -Jon
Last edited by blown340; 03/19/18 01:34 AM.
70 challenger convertible. 340/5 speed. blown, intercooled, efi, blah blah blah
71 valiant scamp 318/A833OD/AC/PS
00 dakota RC 4.7L 5 spd autoX'r. SRT10/T56 swap in process
73 W200 Power wagon, PTO winch, 4 spd
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Re: Swapping from a NP445/NP435 to a NV4500 questions
[Re: blown340]
#2469511
03/21/18 01:31 AM
03/21/18 01:31 AM
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Joined: Aug 2004
Posts: 3,310 Walnut Creek, CA
blown340
OP
master
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OP
master
Joined: Aug 2004
Posts: 3,310
Walnut Creek, CA
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Bump. Does anyone know about the balance of the magnum motors?
70 challenger convertible. 340/5 speed. blown, intercooled, efi, blah blah blah
71 valiant scamp 318/A833OD/AC/PS
00 dakota RC 4.7L 5 spd autoX'r. SRT10/T56 swap in process
73 W200 Power wagon, PTO winch, 4 spd
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Re: Swapping from a NP445/NP435 to a NV4500 questions
[Re: blown340]
#2469678
03/21/18 01:21 PM
03/21/18 01:21 PM
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Joined: Dec 2005
Posts: 1,168 Cruising!
QuickDodge
super stock
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super stock
Joined: Dec 2005
Posts: 1,168
Cruising!
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Looking at replacement flywheel's and clutches they seem to be available in 11" and 12". Will both sizes fit in the stock bellhouing, and if so which one is better to use?
My understanding is the flywheel must match the bellhousing. This is because the starter must be in the correct location to mesh with the gear teeth on the flywheel. Once you have determined which size flywheel is needed, then you can determine what size clutch will bolt onto the flywheel. Something else that must be determined is what size disk is available that will fit the input shaft of the transmission. Then you must verify the clutch disk is the correct thickness to work with the pressure plate you intend to use. If either an 11" or a 12" clutch will fit the flywheel and the input shaft, then you have the option of choosing which size clutch to install. The intended usage of the truck should be taken into consideration. Back in the old days, the general rule was that trucks used for heavy duty purposes had a large clutch. Performance cars usually had smaller diameter clutches and flywheels. (Allows quicker shifting and the engine to rev faster.) This advice may be outdated, so it may be wise to get some current advice on this matter. Blown340, please tell us how to install a Dodge input shaft into a Chevy transmission.
Last edited by QuickDodge; 03/21/18 01:29 PM.
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Re: Swapping from a NP445/NP435 to a NV4500 questions
[Re: blown340]
#2486436
04/22/18 03:33 PM
04/22/18 03:33 PM
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Joined: Apr 2004
Posts: 684 Maine
jerseybud
mopar
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mopar
Joined: Apr 2004
Posts: 684
Maine
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Pics of crossmember here, post 103. 435 on top, 4500 on bottom http://ramchargercentral.com/mopar-trucks/1988-w-100/100/if anything you may have to drill 1-2 more holes in your frame and use existing crossmember, though it will be further back. But maybe not since you started with a 445 instead of a 435 use the 143 tooth 11 inch flywheel for your engine, or have yours ground if its already same dimensions, but measure it fist0 runout, thickness, etc. Just use the flywheel for your year engine 4500 bells are hydraulic- mopar perf used to recommend the 95 dakota set up so it sounds like you're on the right track there clutches were messed up in 92-93- started with 19 spline input, then went to the 10 spline for the rest of the production run. One of the clutches was scalloped as well and dont want to mix and match scalloped flywheel with flat clutch, vice versa. I assume you already have a divorced transfer case?
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Re: Swapping from a NP445/NP435 to a NV4500 questions
[Re: 300by500]
#2490108
04/30/18 07:34 PM
04/30/18 07:34 PM
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Joined: Jan 2003
Posts: 16,376
dogdays
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,376
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My Dodge had a 182? tooth ring gear.
The 11" and the 12" pressure plates have the same bolt pattern. I removed the 11" and installed the 12" with no hassle at all. The pressure plates are exactly the same as Chevy truck pressure plates. The input splines if 10 spline are 1 1/8" diameter, exactly the same as a chevy. So a 12" Chevy pressure plate and disk should be a bolt-on.
I figured I wasn't going to be speed shifting my truck 4 speed so went 12" for durability.
I figured I wasn't going to be speed shifting my truck 4 speed so went 12" for durability. The only question is whether the truck really has the smaller 143T flywheel and if it does, will the 12" pressure plate fit inside.
Now if it's a 10.95" clutch on the 10.5" bolt pattern pressure plate then everything I said doesn't apply.
R.
Last edited by dogdays; 04/30/18 07:38 PM.
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