4.3 to 5.7 s-10 manny tranny - Hot Rod Forum : Hotrodders Bulletin Board
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Old 10-30-2003, 08:18 PM
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4.3 to 5.7 s-10 manny tranny

Hi, I have a sonoma with a 4.3 and a 5spd manual transmission. I'm 90% sure it has the NV3500 tranny and i plan to use it in the conversion to a 350. I'm not sure what bellhousing to use. I know the 4.3 and 350 have the same bolt pattern but i think i read somewhere on the forum that you need to shorten the input shaft and I really don't wanna do that. Anyone know what bellhousing I need: A 350 bellhousing or my original 4.3?

Second Q:
What clutch to use? I'm looking into a Centerforce II or Dual-Friction but I don't know if to get a 4.3 clutch/p. plate or a 350 clutch/p.plate. Do i use the stock linkages and what not or do they need mods? Thanks a lot, this is my first post.
Mac

P.S. anyone know how i can become 10% more sure that i truly have a NV3500?

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Old 11-03-2003, 07:13 PM
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Ok, I found that the s10/s15's only came with NV3500's or T-5's. I have an electronic speed sensor in the tranny not a mechanical like the T-5. I also saw a website about how to change fluid in a NV3500 and the pics on the site matched my tranny: 17mm hex drain plug on the bottom and a 17mm hex fill plug on passenger side about half way up. So I'm now willing to put money on it that I have an NV3500.

But I still don't know what clutch and bellhousing i need. Anyone??????

Last edited by MartyMart9@aol.com; 11-03-2003 at 07:18 PM.
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Old 11-03-2003, 07:58 PM
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The T-5 was only used with the 2.5 & 2.8. All the 4.3 trucks used the NV3500. The bell housing is part of the case. It will bolt to a 350 without problems. They use the same clutch hardware that you would find on a 350. The flywheel will even bolt up if you have a 1 piece seal 350. If your 350 is older, the 4.3 pressure plate and disc will bolt to an old style flywheel. The clutch linkage is hydraulic with the slave mounted in the lower right hand side of the bell housing. It will work fine with the 350 as well. You don't need to mod the input shaft. That's only when the T-5 is being used behind a 350. Dan
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