nv3500 bolted to a sb400 ? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Srubydo1986 · 08-21-2013, 04:35 PM

has any one else done this im currently doing it and seeing if any one else can point me in right direction as far as flywheel and clutches.

my truck is an 86c10 auto that im converting to hydraulic manual.

any help would be great

What i know so far because the 400 need an externally balanced flywheel i cant use my flywheel from the 350.

the 400 flywheel is 11 in disc set up and the factory one is a 10 !/2 ? i think. thus ill need to find an 11 in clutch system that will fit the input shaft of the nv3500.

also i either need to find or make a hydrolic clutch pedal assembly.

mrolds88 · 08-21-2013, 05:18 PM

Pretty sure it should be a simple swap. Flywheel SHOULD fit. I think (its been a while since had my hands on one) the diameter and splines are the same as the older stuff. Even if it is different, you should be able to put 10 1/2 disc on the 11 pressure plate. Only concern I would have is how hard are you going to beat this? The 3500's aren't able to handle a lot of torque. Just don't want you to go through all of this and break it a week later.

Redcap · 08-21-2013, 05:57 PM

The NV3500 is pretty fragile.

79Betty · 08-21-2013, 08:05 PM

My s10 had the 3500 in it. Lasted 2 5 grand dumps at the track behind my cammed 350. Great cruiser but if you're gonna hot rod it AT ALL it'll break. But it should work and if ya get one with a 4.3L bellhousing it should bolt right up? Been a few years...
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bluex · 08-21-2013, 09:41 PM

You can get an 11" clutch for either your truck or an S10/GMT400 platform truck that had that transmission in it. Centerforce sells one for the S10's I know and the pressure plate pattern is the same from what I've read. I'm about to start swapping one in mysef......

**hatzie** · 08-22-2013, 10:24 AM

Fragile is in the application. The NV3500 will take 300ftlbs of torque so higher revving HP isn't a problem... Low range wheeling or towing heavy is where you'd get into trouble. In most applications you don't "need" the higher torque capability of the NV4500.

The flywheel has nothing to do with the input shaft. Your pilot busing is in the crankshaft and the splines engage with the clutch hub...

Where you might run into trouble is the outside diameter of the 11" flywheel or the housing of the 11" pressure plate contacting the integrated bellhousing. The only way to know is assemble and do a rotational check. The pressure plate can be fixed by using a 10" clutch kit.

08-21-2013, 04:35 PM	#1
Srubydo1986 The Crazy Machanic Join Date: Jan 2007 Location: Nokesville Va Posts: 1,437	nv3500 bolted to a sb400 ? has any one else done this im currently doing it and seeing if any one else can point me in right direction as far as flywheel and clutches. my truck is an 86c10 auto that im converting to hydraulic manual. any help would be great What i know so far because the 400 need an externally balanced flywheel i cant use my flywheel from the 350. the 400 flywheel is 11 in disc set up and the factory one is a 10 !/2 ? i think. thus ill need to find an 11 in clutch system that will fit the input shaft of the nv3500. also i either need to find or make a hydrolic clutch pedal assembly. __________________ 1986 Sliverado longbed 400 small block mean as hell, 700r4 trans (5 speed coming one day) 1970 chevelle 2dr sedan Latest update June 24 2007. *1957 4 door stationwagon - pink all original needing a good restore (body great, floors bad) newest additions 1965 shortbed fleet great granddads. Been told im nuts to bring it back from the dead (still going to happen) plans-all stock with a turbo 292 inline 3 speed column shift. and thats it big block 427 and 5 speed trans and ford 9 inch theyhave no home yet thinking what to put them in and a 79 c60 trash truck um no idea i have one

08-21-2013, 05:18 PM	#2
mrolds88 Registered User Join Date: Jul 2011 Location: WV Posts: 946	Re: nv3500 bolted to a sb400 ? Pretty sure it should be a simple swap. Flywheel SHOULD fit. I think (its been a while since had my hands on one) the diameter and splines are the same as the older stuff. Even if it is different, you should be able to put 10 1/2 disc on the 11 pressure plate. Only concern I would have is how hard are you going to beat this? The 3500's aren't able to handle a lot of torque. Just don't want you to go through all of this and break it a week later. __________________ 72 GMC C2500 402/Th400 first truck (still have) 77 GMC C3500 CC dually Sold 70 C50 dump truck "Rusty" 87 K10 Suburban Sold 93 K2500 xcab 6.5TD 96 GMC K2500 Suburban 6.5 TD

08-21-2013, 05:57 PM	#3
Redcap Registered User Join Date: May 2010 Location: Lewis County, WA Posts: 1,523	Re: nv3500 bolted to a sb400 ? The NV3500 is pretty fragile. __________________ '77 K35 - 454, SM465/NP205, 4.56 D60/14bFF

08-21-2013, 08:05 PM	#4
79Betty Registered User Join Date: Jan 2013 Location: Jasper, IN Posts: 948	Re: nv3500 bolted to a sb400 ? My s10 had the 3500 in it. Lasted 2 5 grand dumps at the track behind my cammed 350. Great cruiser but if you're gonna hot rod it AT ALL it'll break. But it should work and if ya get one with a 4.3L bellhousing it should bolt right up? Been a few years... Posted via Mobile Device __________________ When in doubt, throttle it out! 1974 Chevrolet Custom K20 2005 Ford Ranger Edge 1985 Chevrolet Custom Deluxe C10

08-21-2013, 09:41 PM	#5
bluex Registered User Join Date: Jun 2004 Location: Spartanburg, SC Posts: 1,963	Re: nv3500 bolted to a sb400 ? You can get an 11" clutch for either your truck or an S10/GMT400 platform truck that had that transmission in it. Centerforce sells one for the S10's I know and the pressure plate pattern is the same from what I've read. I'm about to start swapping one in mysef...... __________________ Paul '78 GMC Serria 15 Heavy Half. 361/NV3500/3.73. Former LWB NV3500 swap Trailing arm swap '98 ECSB Z71 daily driver -traded '03 burb. Family cruiser http://upstategmtrucks.com/

08-22-2013, 10:24 AM	#6
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,977	Re: nv3500 bolted to a sb400 ? Fragile is in the application. The NV3500 will take 300ftlbs of torque so higher revving HP isn't a problem... Low range wheeling or towing heavy is where you'd get into trouble. In most applications you don't "need" the higher torque capability of the NV4500. The flywheel has nothing to do with the input shaft. Your pilot busing is in the crankshaft and the splines engage with the clutch hub... Where you might run into trouble is the outside diameter of the 11" flywheel or the housing of the 11" pressure plate contacting the integrated bellhousing. The only way to know is assemble and do a rotational check. The pressure plate can be fixed by using a 10" clutch kit. __________________ 1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful.

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