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Old 04-23-2008, 11:46 AM   #1
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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.
Old 04-23-2008, 11:54 AM   #2
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Re: LSx and stock 5 speed

the manual trans from a 4.3 will NOT work behind an LSx based motor
Old 04-23-2008, 12:17 PM   #3
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Re: LSx and stock 5 speed

Quote: Originally Posted by tippmann243
the manual trans from a 4.3 will NOT work behind an LSx based motor
Can you elaborate?
Old 04-23-2008, 01:27 PM   #4
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Re: LSx and stock 5 speed

wont bolt up
Old 04-23-2008, 01:56 PM   #5
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Re: LSx and stock 5 speed

Why won't it bolt up?
Old 04-23-2008, 02:29 PM   #6
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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.
Old 04-23-2008, 02:36 PM   #7
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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.
Old 04-23-2008, 02:42 PM   #8
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Re: LSx and stock 5 speed

Old 04-23-2008, 02:47 PM   #9
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Re: LSx and stock 5 speed

Quote: Originally Posted by philntx
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.
This is not about, is it strong enough. I know it is not the ideal trans. I have the motor right now. I don't have the NV4500. It costs alot and it will come later.
Old 04-23-2008, 02:49 PM   #10
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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.
Old 04-23-2008, 02:54 PM   #11
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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?
Old 04-23-2008, 03:00 PM   #12
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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.
Old 04-23-2008, 03:06 PM   #13
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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.
Old 04-23-2008, 03:28 PM   #14
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Re: LSx and stock 5 speed

if you were swapping an a 5.7 it would work
Old 04-23-2008, 03:31 PM   #15
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Re: LSx and stock 5 speed

Well why won't it work with the LS?
Old 04-23-2008, 04:28 PM   #16
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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.
Old 04-23-2008, 05:10 PM   #17
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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."
Old 04-23-2008, 05:37 PM   #18
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Re: LSx and stock 5 speed

Quote: Originally Posted by chriszr2
Well why won't it work with the LS?

different bellhousing bolt paterns
Old 04-23-2008, 05:41 PM   #19
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Re: LSx and stock 5 speed

Do you know this from personal experience with your swap?
Old 04-23-2008, 06:01 PM   #20
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Re: LSx and stock 5 speed

i was talking about why it wont directly bolt up
Old 04-23-2008, 07:31 PM   #21
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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.
Old 04-23-2008, 07:32 PM   #22
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Re: LSx and stock 5 speed

Quote: Originally Posted by philntx
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."
Where is this quote from? Out of context, I don't know what it refers to.
Old 04-23-2008, 08:23 PM   #23
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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.
Old 04-23-2008, 09:30 PM   #24
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Re: LSx and stock 5 speed

Thanks
Old 04-24-2008, 09:08 AM   #25
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Re: LSx and stock 5 speed

just put it in. It might only use 3 bolts but do it anyways.
Old 04-24-2008, 11:36 AM   #26
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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.
Old 04-24-2008, 02:51 PM   #27
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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.
Old 04-24-2008, 04:10 PM   #28
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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.
Old 04-24-2008, 04:15 PM   #29
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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.
Old 04-24-2008, 04:17 PM   #30
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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.
Old 04-24-2008, 06:09 PM   #31
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Re: LSx and stock 5 speed

why not just do a 4l60e?
Old 04-24-2008, 06:55 PM   #32
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Re: LSx and stock 5 speed

Quote: Originally Posted by THEKING
why not just do a 4l60e?
I dislike automatics.
Old 04-24-2008, 09:54 PM   #33
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Re: LSx and stock 5 speed

Quote: Originally Posted by chriszr2
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.
did u not read post #27? it gives u the answers
why put HD internals? Why not just replace it with a 4500?
Old 04-25-2008, 12:56 AM   #34
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Re: LSx and stock 5 speed

Quote: Originally Posted by 91sonomast
did u not read post #27? it gives u the answers
why put HD internals? Why not just replace it with a 4500?
I think that the contents of my post, that you quoted, would indicate that I read post #27. I was putting an alternate idea out there. One that didn't involve a $400 flywheel. One that would use things that I have. did u not read post #30? The 4500 is 100lbs or more heavier than the 3500. No to mention I would need the tcase to go along with it, as well as different driveshafts. If you are not going to help please refrain from posting.
Old 04-25-2008, 01:19 AM   #35
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Re: LSx and stock 5 speed

Quote: Originally Posted by chriszr2
I think that the contents of my post, that you quoted, would indicate that I read post #27. I was putting an alternate idea out there. One that didn't involve a $400 flywheel. One that would use things that I have. did u not read post #30? The 4500 is 100lbs or more heavier than the 3500. No to mention I would need the tcase to go along with it, as well as