Go Back   Ford Truck Enthusiasts Forums > Older, Classic & Antique Trucks > 1967 - 1972 F-100 & Larger F-Series Trucks
Sign in using an external account
Register Forgot Password?


1967 - 1972 F-100 & Larger F-Series Trucks Discuss the Bumpsides Ford Truck

Welcome to Ford-Trucks Forums!
Welcome to Ford-Trucks.com.

You are currently viewing our forums as a guest, which gives you limited access to view most discussions and access our other features. By joining our community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join the Ford-Trucks Forums community today!





 
Reply
 
LinkBack Thread Tools Search this Thread
  #1  
Old 11-19-2004, 03:59 PM
mallard8767 mallard8767 is offline
New User
 
Join Date: Nov 2004
Posts: 11
mallard8767 is starting off with a positive reputation.
Talking Granny gear transmissions

I wanted to find out what the rest of you thought about the 72ish transmissions with granny gear. I just recently read about them and i was wodering how having only three real gears effects your top speed around town.
Reply With Quote
  #2  
Old 11-19-2004, 05:35 PM
kwanderi's Avatar
kwanderi kwanderi is offline
Senior User
 
Join Date: Jan 2004
Location: Buckeye, AZ
Posts: 157
kwanderi is starting off with a positive reputation.
I have no problem crusing @ 70-75 with my 4 speed, still has a lot of throttle left to go too. I have a tach on the way, so I don't know the RPM's, but it certainly doesn't feel very high.

Mileage is still around 12 with a 428 under hood, so I'm happy with it.

Keith
__________________
Keith
72 F-100 4x4
Shortbox
a 428 with a 4 speed
PS, PB & Air
Reply With Quote
  #3  
Old 11-19-2004, 05:49 PM
Unimog005's Avatar
Unimog005 Unimog005 is offline
Elder User
 
Join Date: Jul 2004
Location: Boulder, Colorado
Posts: 906
Unimog005 is starting off with a positive reputation.
The three gears is no problem....You go through 1 and 2 pretty quick and then cruise in 3....I live in Colorado and I easily accelerate from 65 up to 75 going uphill.....65 for me is about 3000 rpm (390 Engine/New Process 435 Trans/NP 205 T-fer case) What's really fun with the 4x4 is shifting in to L and 4L.....boy! What a crawler!
Reply With Quote
  #4  
Old 11-19-2004, 06:24 PM
WillyB's Avatar
WillyB WillyB is offline
Post Fiend
 
Join Date: Sep 2004
Location: Near Fresno, California
Posts: 5,231
WillyB has a great reputation on FTE.WillyB has a great reputation on FTE.WillyB has a great reputation on FTE.WillyB has a great reputation on FTE.
4 speeds with granny low were built for engines with a wide power band - generally 1500 RPM to 3500 RPM. If you look at all the ratios in the trans you will see it covers all speeds normally driven.

On the ones I have used, first was just to start the load, second to about 25 MPH, third to 45 or 50, and high for cruising. It sucks a bit in that if you can not pull a hill in high you have to drop below 50 MPH, and hitting second in the mountains keeps you below 25 MPH. But that is the nature of the beast.

The old cast iron engines seemed to last a lot longer if you kept them below 3000 RPM, so we would use the rear end ratio and tire size to turn the engine around 2600 RPM at our cruizing speed.
__________________
Willy B
Nobody ever went broke underestimating the intelligence of the American people. - PT Barnum
Reply With Quote
  #5  
Old 11-19-2004, 07:25 PM
RR4E RR4E is offline
Elder User
 
Join Date: Oct 2004
Location: Winnipeg, Manitoba
Posts: 984
RR4E is starting off with a positive reputation.
I ran a 390 with .060 overbore, 10:1 flat tops, and a 260/270 rv cam, with the relatively stock 2bbl carb and intake(gasket match ported heads and intake manifold, along with mild reworking of carb jets and metering rods for side-hilling) and I never pulled a gear i the mountains. I lived in Jasper, Alberta for 8 yrs, and had that truck maxed out for towing and hauling a few times and all 4th required was a bit more fuel to keep it at speed up the hills. If your engine is stock, you may suffer. With everything I did, I was running an average of 18 mpg highway(empty) and around 13-15 loaded, in town was ok at around 10-12 depending on my heavy foot. Mileage would have been better with an intake and off-road carb added to it.
Reply With Quote
  #6  
Old 11-19-2004, 07:28 PM
baitmaster baitmaster is offline
Posting Guru
 
Join Date: Mar 2003
Location: nevada
Posts: 1,597
baitmaster is starting off with a positive reputation.
rear ratio

I never use granny gear on my '72 unless I'm pulling something, and thats just to save some clutch wear. If I punch 1st gear I just get tire spin anyhow, and its wound tight in about 2 seconds. Sometimes I wish I had an auto tranny so I could just hold it to the floor and let it do its thing. Those 4 speeds arent the greatest for "speed shifting".
Reply With Quote
  #7  
Old 11-19-2004, 07:32 PM
green truck green truck is offline
New User
 
Join Date: Nov 2004
Posts: 8
green truck is starting off with a positive reputation.
granny low behind 360

I have a 76 f-100 that had a 302 3 speed and when I droped in a old 72 360 FE and granny low 4 speed in 16 years ago it made a great work truck. with the 302 if I was tring to pull a heavy load to get it moving required slipping the cluch a lot. and often it was snip a tire or bog. The 360 is well worn but drop it in granny and somethings going to move.
Reply With Quote
Old 11-19-2004, 07:32 PM
Reply

Go Back   Ford Truck Enthusiasts Forums > Older, Classic & Antique Trucks > 1967 - 1972 F-100 & Larger F-Series Trucks

Tags
ford, gear, granny, truck, trucks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 On
Trackbacks are On
Pingbacks are On
Refbacks are On
Forum Jump



All times are GMT -5. The time now is 04:19 AM.


Powered by vBulletin® Version 3.7.5
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Advertising - Terms of Use - Privacy Statement - Jobs
This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. FordŽ is a registered trademark of the Ford Motor Company.

vbulletin Admin Backup