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Old 08-29-2006, 01:41 AM   #1 (permalink)
rock_shoes
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5 speed manual Transmission options for a 6.2

I'm currently in the process of rebuilding my 85 6.2 K20 with a muncie M20 manual trans and I am wondering what options I have for a 5 speed manual trans. I know I can by a new NV4500 but I was hoping I might be able to use a 5 speed from a junked 6.5 and do a rebuild on it when funds were more plentifull. My main concern is that I won't be able to connect a trans from a 6.5 to my stock transfer case. Also I don't want to give up my "granny gear". This truck see's 4x4 often enough to need it.
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Old 08-29-2006, 08:43 AM   #2 (permalink)
CrewCab59
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a 208,205 will bolt up to a nv4500 .They were used with the 6.5 .
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Old 08-29-2006, 12:04 PM   #3 (permalink)
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I just installed a 6.5 with a NV4500. It bolted right up to my 208. High Sierra just installed a NV3500.
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Old 08-29-2006, 04:06 PM   #4 (permalink)
FLChevy
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The NV4500 has a granny gear.
I found the used prices quite high on used NV4500's running about 2/3 to 3/4 the price of new. I ran out of patience waiting for a good deal on a used one. think I paid $1850 for a brand new one.
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Old 08-29-2006, 05:07 PM   #5 (permalink)
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Welcome to the forum!

You probably want the NV4500 so you can have the overdrive and the granny gear, plus the bulletproof aspect of things is important.

Or you can do what I did... I went to the junkyard and told them I wanted a manual tranny that would bolt to my 6.2, preferably with overdrive and a hydraulic clutch. They told me they had a three speed and a five speed... I went with the five speed. It came out of an S-10, but apparently it came out of a mid '90s fullsize before that... I think it is an NV3500, but I can't say that for sure.
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Old 08-30-2006, 11:45 AM   #6 (permalink)
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Thanks everyone

Thanks for the help everyone. I think I will replace the broken input shaft on the muncie for the time being and purchase a new NV 4500 when funds are a little more plentifull. You see I just went with a full rebuild kit from DSG (Stud girdle, Dual idler gears, 30 over Mahle pistons to be matched to the cylinders by my machine shop, the works really) and If I wait I can avoid owing my soul to the bank and do everything for cash. I'm even considering putting in a turbo at some point over the next year. I think it's probably better to break in the rebuild before adding one.

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Old 08-30-2006, 12:08 PM   #7 (permalink)
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What kind of bell housing are you using with the M20? I had an M20 behind my big block and used the larger bellhousing from a SM465 trans. The pilot hole is larger on the SM465 than the M20. I ran it like that for a while but when I rebuilt it we added a brass ring to the trans to make up the difference so it fit right.
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Old 08-30-2006, 09:36 PM   #8 (permalink)
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Quote:
Originally Posted by Jeli;1271708;
What kind of bell housing are you using with the M20? I had an M20 behind my big block and used the larger bellhousing from a SM465 trans. The pilot hole is larger on the SM465 than the M20. I ran it like that for a while but when I rebuilt it we added a brass ring to the trans to make up the difference so it fit right.
I would assume he means the original type SM465 tranny, which is option coded M20... as opposed to the old style M20/21/22 trannies from the muscle car days... guess they like to make it complicated!

Then again, I could be wrong!
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Old 08-30-2006, 09:41 PM   #9 (permalink)
rock_shoes
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The truck came from the factory with the M20. I know this for sure because the truck has been in the family from new. Maybe the trucks that came from the factory with an M20 had there own unique bell-housing. I'm not sure. That would explain why it's so hard to find a bell housing for it from a wrecker. It would be great if I could use a bellhousing from a SM465 with a brass ring for the pilot hole. I think that would probably be easier to find. The main reason I was considering changing to a 5 speed now rather than later (when I could afford a brand new one) was what happened when the crank went in the truck. It went outside the block killing the bellhousing and the input shaft instead of the block.

1985 6.2l K20
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Old 08-30-2006, 09:42 PM   #10 (permalink)
rock_shoes
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that would make sense
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