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#1 |
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Registered User
Join Date: Dec 2003
Posts: 193
Location: User is: OffLine ![]() |
LSx and stock 5 speed
Now I have searched and read other threads. All people say is the NV3500 is weak. Which I think is not exactly fair. I have towed lots of weight, cross country, several times with my truck. It has 200k plus miles and no trans issues. Has anyone done it though? The 4.3 and the LSx use the same bellhousing correct? I have put a corvette bellhousing on the back of a 4.3 and it all seems the same. The only things I can think of are the hardware and dowels for the 4.3 are standard while the LSx is metric but the bolt pattern and the crank center are the same. I don't plan on running the stock trans forever. I will eventually get an NV4500 from a Silverado. The reason for not using a T56 is that my truck is a ZR2 and I plan to keep it 4wd. I saw where a guy put a 5.3 truck motor I think in a ZR2 but his was an auto. Next question would be, what flywheel to use? Do the two flywheels share bolt pattern? If so I just use the s-10 flywheel and clutch for now and when the time comes, I get the silverado flywheel and clutch to go along with the NV4500.
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#2 |
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the youngest has been
Age: 21
Join Date: Jul 2004
Posts: 2,944
Location: FLORISSANT MO User is: OffLine ![]() |
Re: LSx and stock 5 speed
the manual trans from a 4.3 will NOT work behind an LSx based motor
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#3 |
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Registered User
Join Date: Dec 2003
Posts: 193
Location: User is: OffLine ![]() |
Re: LSx and stock 5 speed
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#4 |
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Hi-Tech Redneck
Age: 18
Join Date: Mar 2007
Posts: 2,934
Location: Albany, GA User is: OffLine ![]() |
Re: LSx and stock 5 speed
wont bolt up
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#5 |
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Registered User
Join Date: Dec 2003
Posts: 193
Location: User is: OffLine ![]() |
Re: LSx and stock 5 speed
Why won't it bolt up?
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#6 |
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Registered User
Join Date: Dec 2003
Posts: 193
Location: User is: OffLine ![]() |
Re: LSx and stock 5 speed
Well I have here, a 4.3 V6 and a bellhousing for a C5 corvette. It goes on there like I said. It doesen't have the top bolt hole, and the right hand hole between the top hole and the two bottom holes. The means it uses 5 of 7 bolts. The dowel pins are in the right spot, just smaller on the 4.3. The crank center appears to be the same too. So I ask why does an LSx not bolt up to an NV3500. Is it input shaft issues? Crank centerline?
Last edited by chriszr2 : 04-23-2008 at 02:39 PM. |
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#7 |
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Build it Right!
Age: 53
Join Date: Jul 2006
Posts: 1,333
Location: Plano TX User is: OffLine ![]() |
Re: LSx and stock 5 speed
Torque capacity.
It’s all aluminum with a 4.02:1 first gear and a 285lbs-ft input torque rating. (courtesy GM Powertrain) An LS1 in stock configuration is at least 325+ Add to that, the 31"+ tall tires, 200K+ miles, and your first "strong" 1-2 or 2-3 shift will eventually create a lot of "extra" parts inside the transmission. |
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#8 |
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Registered User
Join Date: Dec 2003
Posts: 193
Location: User is: OffLine ![]() |
Re: LSx and stock 5 speed
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#9 |
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Registered User
Join Date: Dec 2003
Posts: 193
Location: User is: OffLine ![]() |
Re: LSx and stock 5 speed
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#10 |
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ls1 junkie
Join Date: Aug 2007
Posts: 288
Location: User is: OffLine ![]() |
Re: LSx and stock 5 speed
it might bolt up just fine....but it will not hold up is what were trying to get at....especially with the mileage your tranny has on it.
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#11 |
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Registered User
Join Date: Dec 2003
Posts: 193
Location: User is: OffLine ![]() |
Re: LSx and stock 5 speed
Please no need for any further comments about the strength of the trans. I know it is not as strong as needed for this engine. People here have said it will not bolt up. I want to hear from them why not?
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#12 |
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Build it Right!
Age: 53
Join Date: Jul 2006
Posts: 1,333
Location: Plano TX User is: OffLine ![]() |
Re: LSx and stock 5 speed
Put them together and see if they'll work.
Go down to a salvage yard and get a scrap NV3500 for a trial fit. |
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#13 |
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Registered User
Join Date: Dec 2003
Posts: 193
Location: User is: OffLine ![]() |
Re: LSx and stock 5 speed
I may have to do that. I really don't want my truck to be down for too long, so I need to be sure that this will work.
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#14 |
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Don't tread on me.
Age: 21
Join Date: Jun 2007
Posts: 1,410
Location: oakley, california User is: OffLine ![]() |
Re: LSx and stock 5 speed
if you were swapping an a 5.7 it would work
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#15 |
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Registered User
Join Date: Dec 2003
Posts: 193
Location: User is: OffLine ![]() |
Re: LSx and stock 5 speed
Well why won't it work with the LS?
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#16 |
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Build it Right!
Age: 53
Join Date: Jul 2006
Posts: 1,333
Location: Plano TX User is: OffLine ![]() |
Re: LSx and stock 5 speed
Sorry, the S10 Version of the NV350 comes with a 3.49 first gear. The V8 Version of the trans has the 4.02
Here's a pic of the NV3500 Back of a 5.3 engine (same as an LS1) ![]() Last edited by philntx : 04-23-2008 at 04:46 PM. |
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#17 |
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Build it Right!
Age: 53
Join Date: Jul 2006
Posts: 1,333
Location: Plano TX User is: OffLine ![]() |
Re: LSx and stock 5 speed
Check with these guys:
"Non-OE transmission swaps will require a spacer adapter and a custom flywheel/flexplate. McLeod (714/630-3668) offers modular bellhousings for non-OE manual transmission swaps." |
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#18 |
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Don't tread on me.
Age: 21
Join Date: Jun 2007
Posts: 1,410
Location: oakley, california User is: OffLine ![]() |
Re: LSx and stock 5 speed
different bellhousing bolt paterns |
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#19 |
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Build it Right!
Age: 53
Join Date: Jul 2006
Posts: 1,333
Location: Plano TX User is: OffLine ![]() |
Re: LSx and stock 5 speed
Do you know this from personal experience with your swap?
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#20 |
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Don't tread on me.
Age: 21
Join Date: Jun 2007
Posts: 1,410
Location: oakley, california User is: OffLine ![]() |
Re: LSx and stock 5 speed
i was talking about why it wont directly bolt up
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#21 |
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Registered User
Join Date: Dec 2003
Posts: 193
Location: User is: OffLine ![]() |
Re: LSx and stock 5 speed
Well if you see my picture above, that is a C5 corvette bellhousing bolted to a 4.3 V6. So they bolt together.
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#22 |
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Registered User
Join Date: Dec 2003
Posts: 193
Location: User is: OffLine ![]() |
Re: LSx and stock 5 speed
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#23 |
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Build it Right!
Age: 53
Join Date: Jul 2006
Posts: 1,333
Location: Plano TX User is: OffLine ![]() |
Re: LSx and stock 5 speed
I would defer your question to this forum. You'll have better response:
http://www.performancetrucks.net/for...splay.php?f=22 Go to the Drivetrain/Transmission section. |
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#24 |
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Registered User
Join Date: Dec 2003
Posts: 193
Location: User is: OffLine ![]() |
Re: LSx and stock 5 speed
Thanks
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#25 |
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ls1 junkie
Join Date: Aug 2007
Posts: 288
Location: User is: OffLine ![]() |
Re: LSx and stock 5 speed
just put it in. It might only use 3 bolts but do it anyways.
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#26 |
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Registered User
Join Date: Dec 2003
Posts: 193
Location: User is: OffLine ![]() |
Re: LSx and stock 5 speed
It uses 5 bolts. With some more research, there seems to be a dodge version of the NV3500. NV3500HD. It is rated at 350ftlbs. Maybe I can swap internals from one of those? We shall see.
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#27 |
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Registered User
Join Date: Jul 2006
Posts: 37
Location: User is: OffLine ![]() |
Re: LSx and stock 5 speed
The NV3500 would work, but it's going to be more money than it's really worth to make it work (in my opinion).
Reason I say... I have an LT1 T56 with a Weir Hot Rod bellhousing/throwout bearing (to use with a standard push-style clutch, this is NOT an LT1 setup anymore folks). It was freshly rebuilt by me so I know the condition of everything inside, and I didn't want to tear it apart for anything (LS input shaft), so I bought the conversion flywheel. Physical dimensions of the 2 transmissions (NV3500 and my custom T56) on how they hook up is exactly the same. I have a 4.3 with an NV3500 sitting on the floor of my dad's pole barn so I went and measured stuff. From the edge of the block where the transmission bolts up to the face of the flywheel was exactly .400" different. The LS1 flywheel sat closer to the block on my engine. I had a .400" thick spacer plate that was behind the stock flexplate, but the flywheel bolts were not long enough to pass through both, and I would have had starter alignment issues (wouldn't have connected with the ring gear). A thicker face flywheel is the solution... You'll have to have a clutch plate that has 10 splines x 1 1/8 inch, instead of the stock LS 26 spline. McLeod sells an adapter flywheel that's .400" thicker than stock (so yes it's heavier than an LS1 flywheel, 31 lbs). McLeod part number 460535. I picked mine up from a place called Byunspeed (Summit and Jegs would have had to order them and then ship to me, ~10 days before shipment to me, they said). Byunspeed drop-shipped it from the manufacturer and it was there 4 business days later. Pretty good. It's not cheap, ~$420, but it works. Last edited by Sherk : 04-24-2008 at 02:57 PM. |
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#28 |
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Good Bye SonomaST
Age: 24
Join Date: Sep 2005
Posts: 5,606
Location: Jacksonville, FL User is: OffLine ![]() |
Re: LSx and stock 5 speed
your going to have alot of money wrapped up in a "just for now" setup. hold off a little longer and buy the trans you want and do the swap then. if not your going to hate to part with the NV3500 because of all the money in it, but you arent going to beable to use the power because your afraid of grenading your Nv3500.
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#29 |
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Registered User
Join Date: Dec 2003
Posts: 193
Location: User is: OffLine ![]() |
Re: LSx and stock 5 speed
What about the 4.3 flywheel? It doesen't have the same bolt pattern as the LS crank? Or it would not allow starter engagement? I am just guessing but I would think you could use the standard LS1 flywheel and clutch disc to match the NV3500 input. The .400 difference I think could be made up for on the splines of the NV input shaft. As in I think the NV input shaft engages the stock clutch disc with room to spare, not just the very beginning of the splines. Then I could easily make an extension to hold the pilot bearing.
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#30 |
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Registered User
Join Date: Dec 2003
Posts: 193
Location: User is: OffLine ![]() |
Re: LSx and stock 5 speed
I wouldn't be afraid to keep the NV3500 if I can figure out how to use the HD internals from a dodge, actually from a 4.0 straight six jeep. The nv4500 is 100lbs or so heavier than the 3500.
Last edited by chriszr2 : 04-24-2008 at 04:18 PM. |
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#31 |
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More Go then Show
Age: 23
Join Date: Mar 2004
Posts: 1,134
Location: Scottsdale, AZ User is: OffLine ![]() |
Re: LSx and stock 5 speed
why not just do a 4l60e?
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#32 |
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Registered User
Join Date: Dec 2003
Posts: 193
Location: User is: OffLine ![]() |
Re: LSx and stock 5 speed
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#33 |
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Good Bye SonomaST
Age: 24
Join Date: Sep 2005
Posts: 5,606
Location: Jacksonville, FL User is: OffLine ![]() |
Re: LSx and stock 5 speed
why put HD internals? Why not just replace it with a 4500? |
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#34 |
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Registered User
Join Date: Dec 2003
Posts: 193
Location: User is: OffLine ![]() |
Re: LSx and stock 5 speed
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#35 |
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^Almost^
Age: 23
Join Date: Jul 2007
Posts: 166
Location: Eau Claire, Wisconsin User is: OffLine ![]() |
Re: LSx and stock 5 speed
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