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

sjarrett71 · 12-27-2010, 10:58 PM

My 72 GMC currently has a granny low 4-speed in it. Eventually I want to go back to an automatic (it was originally an auto from the factory) but I found a 3 speed manual close to me that is reasonably priced. I don't know the different gear ratios in the transmissions and I understand the granny low is basically like a 3 speed with the low gear.

My question is, would going to the 3 speed benefit me in any way such as speed or gas mileage or lowering my RPM's?

Thanks.

BLK96 · 12-28-2010, 01:00 AM

No -- top gear is still 1:1.

BIGBLU 72 · 12-28-2010, 01:21 AM

IMHO keep the bulldog! Alot of guys on here love their 3 speeds on the column but in my limited experience i have had nothing but trouble outta them! plus you never know when you will need the grunt of Granny to pull something?

treveiger · 12-28-2010, 01:53 AM

I thought about switching my 4 speed out but decided against it because im going to put a low rear end on it with bigger tires to drop my rpms down instead of getting a tranny with a OD. I love the granny gear its good for idleing along and taking off up steep hills.
Hope this helps

12-27-2010, 10:58 PM	#1
sjarrett71 Registered User Join Date: Dec 2006 Location: Rolla, MO Posts: 2,463	Transmission Opinion Question My 72 GMC currently has a granny low 4-speed in it. Eventually I want to go back to an automatic (it was originally an auto from the factory) but I found a 3 speed manual close to me that is reasonably priced. I don't know the different gear ratios in the transmissions and I understand the granny low is basically like a 3 speed with the low gear. My question is, would going to the 3 speed benefit me in any way such as speed or gas mileage or lowering my RPM's? Thanks. __________________ -Scott- Last edited by sjarrett71; 12-27-2010 at 11:10 PM.

12-28-2010, 01:00 AM	#2
BLK96 Registered User Join Date: Dec 2008 Location: OKC, OK Posts: 29	Re: Transmission Opinion Question No -- top gear is still 1:1.

12-28-2010, 01:21 AM	#3
BIGBLU 72 Registered User Join Date: Dec 2008 Location: Ashland, KY Posts: 700	Re: Transmission Opinion Question IMHO keep the bulldog! Alot of guys on here love their 3 speeds on the column but in my limited experience i have had nothing but trouble outta them! plus you never know when you will need the grunt of Granny to pull something? __________________ 68 C10 LWB 2/4 drop 406/th400/3.73posi 04 Silverado SS LQ9 6.0/4L65e/4.11posi AWD

12-28-2010, 01:53 AM	#4
treveiger Senior Member Join Date: Jul 2010 Location: South Dakota Posts: 4,093	Re: Transmission Opinion Question I thought about switching my 4 speed out but decided against it because im going to put a low rear end on it with bigger tires to drop my rpms down instead of getting a tranny with a OD. I love the granny gear its good for idleing along and taking off up steep hills. Hope this helps __________________ 1969 Chevy c20(Miss Hackjob)



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