Can a 4 speed be used with a Dana 20? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**ScottH** · 11-15-2007, 08:54 PM

Just got a restored frame on ebay and it has a rebuilt Dana 20 in it.
No engine or trans, was thinking of looking for a 4 speed to use in it.
I know Dana 20 cases often had 3 speeds, but would rather have the 4 speed if I can.

Any info or suggestions are greatly appreciated.

Thanks.

Scott

GMCMAX · 11-15-2007, 11:17 PM

The 70 blazer drivetrain I bought to do my conversion is a 4 speed and D20, I think the trans is the SM465

Blazer1970 · 11-16-2007, 07:00 AM

From the picture, it looks like the Dana 20 on that frame you bought has the adapter for an SM465 on it. You would just need to find a 465 with the correct output shaft. Is the shifter for the Dana 20 there?

**ScottH** · 11-16-2007, 09:28 AM

Thanks guys, GMCMAX sounds like you answered my question.

Tim, I believe the auction includes a chrome shifter for the Dana 20 (can't get to ebay from work).

Can anyone tell me the pros or cons of the Dana 20 vs say a NP205?

Thanks again to all.

Scott

**ScottH** · 11-16-2007, 02:23 PM

Tim, forgot to ask, would you know what the correct output shaft would be for the Dana 20?

thanks.

Scott

1969 GMC · 11-16-2007, 05:40 PM

Quote:

Originally Posted by ScottH

Tim, forgot to ask, would you know what the correct output shaft would be for the Dana 20?

thanks.

Scott

It will be 10 spline output, just like the 205's of this era.

As far as size is concerned, the D20 was most prevalent in Jeeps, Scouts, and perhaps early Broncos (don't know much about them). I think it would be fine if you left everything stock, stockish hp that is. If you want lots of power I'd go ahead and get a 205 now and save yourself some headache.

GMCMAX · 11-16-2007, 11:58 PM

I haven't broken mine behind a stock 350, but I don't do any hardcore four wheelin, shifter doesn't come through the standard hole in the hump, it's to the rear of the trans shifter and leans left.

**ScottH** · 11-17-2007, 09:16 AM

Thanks guys!

11-15-2007, 08:54 PM	#1
ScottH Senior Member Join Date: Sep 2002 Location: Hampstead, NC Posts: 8,187	Can a 4 speed be used with a Dana 20? Just got a restored frame on ebay and it has a rebuilt Dana 20 in it. No engine or trans, was thinking of looking for a 4 speed to use in it. I know Dana 20 cases often had 3 speeds, but would rather have the 4 speed if I can. Any info or suggestions are greatly appreciated. Thanks. Scott __________________ 1963 C10 swb fleetside 1966 GMC G1000 Handi-bus (future project) 1955 Chevy 2 dr. wagon

11-15-2007, 11:17 PM	#2
GMCMAX Active Member Join Date: Jan 2006 Location: Lower Mid-East Ca. Posts: 326	Re: Can a 4 speed be used with a Dana 20? The 70 blazer drivetrain I bought to do my conversion is a 4 speed and D20, I think the trans is the SM465 __________________ Never try to teach a pig to sing; it wastes your time and annoys the pig! Gets More Chicks My lugnuts require more torque than your honda makes! 68 GMC, 4X4 conversion w/73 k20 running gear and springs, 350 4spd, 4.10's, D44 powerlok front, 14BFF govlock rear, 33" tires, lifted 4".

11-16-2007, 07:00 AM	#3
Blazer1970 Registered User Join Date: Dec 1999 Location: Old Mission, MI, USA Posts: 2,510	Re: Can a 4 speed be used with a Dana 20? From the picture, it looks like the Dana 20 on that frame you bought has the adapter for an SM465 on it. You would just need to find a 465 with the correct output shaft. Is the shifter for the Dana 20 there? __________________ Tim

11-16-2007, 09:28 AM	#4
ScottH Senior Member Join Date: Sep 2002 Location: Hampstead, NC Posts: 8,187	Re: Can a 4 speed be used with a Dana 20? Thanks guys, GMCMAX sounds like you answered my question. Tim, I believe the auction includes a chrome shifter for the Dana 20 (can't get to ebay from work). Can anyone tell me the pros or cons of the Dana 20 vs say a NP205? Thanks again to all. Scott __________________ 1963 C10 swb fleetside 1966 GMC G1000 Handi-bus (future project) 1955 Chevy 2 dr. wagon

11-16-2007, 02:23 PM	#5
ScottH Senior Member Join Date: Sep 2002 Location: Hampstead, NC Posts: 8,187	Re: Can a 4 speed be used with a Dana 20? Tim, forgot to ask, would you know what the correct output shaft would be for the Dana 20? thanks. Scott __________________ 1963 C10 swb fleetside 1966 GMC G1000 Handi-bus (future project) 1955 Chevy 2 dr. wagon

11-16-2007, 11:58 PM	#7
GMCMAX Active Member Join Date: Jan 2006 Location: Lower Mid-East Ca. Posts: 326	Re: Can a 4 speed be used with a Dana 20? I haven't broken mine behind a stock 350, but I don't do any hardcore four wheelin, shifter doesn't come through the standard hole in the hump, it's to the rear of the trans shifter and leans left. __________________ Never try to teach a pig to sing; it wastes your time and annoys the pig! Gets More Chicks My lugnuts require more torque than your honda makes! 68 GMC, 4X4 conversion w/73 k20 running gear and springs, 350 4spd, 4.10's, D44 powerlok front, 14BFF govlock rear, 33" tires, lifted 4".

11-17-2007, 09:16 AM	#8
ScottH Senior Member Join Date: Sep 2002 Location: Hampstead, NC Posts: 8,187	Re: Can a 4 speed be used with a Dana 20? Thanks guys! __________________ 1963 C10 swb fleetside 1966 GMC G1000 Handi-bus (future project) 1955 Chevy 2 dr. wagon



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