Transmission Questions - The 1947 - Present Chevrolet & GMC Truck Message Board Network

rcbildr · 10-31-2012, 03:58 PM

Is the bellhousing bolt pattern on a 305 V6 the same as a V8? I have an NV-3500 sitting in my shop and was wondering if I could put that behind the V6 in my truck. Or, would a T-5 bolt up to the stock bellhousing and use the stock clutch? Any help will be greatly appreciated. Thanks.
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slorio · 10-31-2012, 04:35 PM

305 V6 in GMC's have a different bolt pattern from Chevy. The V6's did use an adapter plate for trucks with factory automatic transmissions that would enable you to convert over. They come up occasionally on Ebay or you can check the discussion group on:

6066gmcguy.org

The T-5 could be adapted to the stock bell housing behind your V6. However, the T-5 isn't a very strong transmission and the V6 has a lot of torque. The Inliners.org has some good write ups on adapting T-5's.

I am running a 3 speed with overdrive (T-85). Two different versions were used in the 50's and 60's in Chevies if you are looking to get an overdrive gear into your truck. You can read about them here:
http://speedprint.com/deves50/overdriveindex.php

Hope this helps.
Regards,
Steve
New Orleans

rcbildr · 10-31-2012, 06:11 PM

I'm not dead set on getting overdrive, just trying to find the best way to spend my money. In order to get it on the road I need to buy a floor shifter for it....then i got to thinking/wondering if that cash could be used towards something a little better. Thanks.
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**MusicMan70** · 10-31-2012, 06:20 PM

Pretty sure someone on the Jolly 6066 site did this already; just needed an adapter(which he made) to mate the tranny.

**MusicMan70** · 10-31-2012, 06:56 PM

A few pics...I believe he is a member here as well. It was an NV4500.
Eaerl is his name; Beautiful truck too.

10-31-2012, 03:58 PM	#1
rcbildr Registered User Join Date: Sep 2000 Location: Gold Bar, WA Posts: 1,216	Transmission Questions Is the bellhousing bolt pattern on a 305 V6 the same as a V8? I have an NV-3500 sitting in my shop and was wondering if I could put that behind the V6 in my truck. Or, would a T-5 bolt up to the stock bellhousing and use the stock clutch? Any help will be greatly appreciated. Thanks. Posted via Mobile Device __________________ My Projects: 1960 GMC 1/2ton with 305 V6 (daily driver) 1963 Chevy 1/2ton 2wd...converting to 4x4 1967 Suburban 1/2ton 2wd My Girlfriends Projects 1985 Chevy Suburban 3/4ton 4x4 with 6.2L diesel, 4" lift, converted to TH-400, Warn Premium manual hubs, & Wildcat 315/75/R16 tires. (daily driver) 1978 Camaro Type LT with a Marine 350 & vortec heads, Rochester Carb, & roller cam 1978 Camaro Z28

10-31-2012, 04:35 PM	#2
slorio Registered User Join Date: Sep 2006 Location: Louisiana Posts: 375	Re: Transmission Questions 305 V6 in GMC's have a different bolt pattern from Chevy. The V6's did use an adapter plate for trucks with factory automatic transmissions that would enable you to convert over. They come up occasionally on Ebay or you can check the discussion group on: 6066gmcguy.org The T-5 could be adapted to the stock bell housing behind your V6. However, the T-5 isn't a very strong transmission and the V6 has a lot of torque. The Inliners.org has some good write ups on adapting T-5's. I am running a 3 speed with overdrive (T-85). Two different versions were used in the 50's and 60's in Chevies if you are looking to get an overdrive gear into your truck. You can read about them here: http://speedprint.com/deves50/overdriveindex.php Hope this helps. Regards, Steve New Orleans

10-31-2012, 06:11 PM	#3
rcbildr Registered User Join Date: Sep 2000 Location: Gold Bar, WA Posts: 1,216	Re: Transmission Questions I'm not dead set on getting overdrive, just trying to find the best way to spend my money. In order to get it on the road I need to buy a floor shifter for it....then i got to thinking/wondering if that cash could be used towards something a little better. Thanks. Posted via Mobile Device __________________ My Projects: 1960 GMC 1/2ton with 305 V6 (daily driver) 1963 Chevy 1/2ton 2wd...converting to 4x4 1967 Suburban 1/2ton 2wd My Girlfriends Projects 1985 Chevy Suburban 3/4ton 4x4 with 6.2L diesel, 4" lift, converted to TH-400, Warn Premium manual hubs, & Wildcat 315/75/R16 tires. (daily driver) 1978 Camaro Type LT with a Marine 350 & vortec heads, Rochester Carb, & roller cam 1978 Camaro Z28

10-31-2012, 06:20 PM	#4
MusicMan70 Senior Member Join Date: Feb 2011 Location: Corona, CA Posts: 1,842	Re: Transmission Questions Pretty sure someone on the Jolly 6066 site did this already; just needed an adapter(which he made) to mate the tranny. __________________ MusicMan70 1961 GMC Suburban

10-31-2012, 06:56 PM	#5
MusicMan70 Senior Member Join Date: Feb 2011 Location: Corona, CA Posts: 1,842	Re: Transmission Questions A few pics...I believe he is a member here as well. It was an NV4500. Eaerl is his name; Beautiful truck too. Attached Images __________________ MusicMan70 1961 GMC Suburban



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