The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1967 - 1972 Chevrolet & GMC Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 12-27-2010, 10:58 PM   #1
sjarrett71
Registered User
 
sjarrett71's Avatar
 
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.
sjarrett71 is offline   Reply With Quote
Old 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.
BLK96 is offline   Reply With Quote
Old 12-28-2010, 01:21 AM   #3
BIGBLU 72
Registered User
 
BIGBLU 72's Avatar
 
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
BIGBLU 72 is offline   Reply With Quote
Old 12-28-2010, 01:53 AM   #4
treveiger
Senior Member
 
treveiger's Avatar
 
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)
treveiger is offline   Reply With Quote
Reply

Bookmarks


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 10:49 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com