OT? Ford 9"
Thread Starter
|
Laughing Gas
Joined: Jun 2011
Posts: 1,041
Likes: 53
From: Sterling CO
One thing I would say is that is one super super close ratio 1st is ~2.5 and 3rd is 1.00. If you are wanting freeway speeds and the ability to start from a dead start you have to have a larger range than that. I'd be looking at a trans swap.
Elder User
Joined: Nov 2008
Posts: 915
Likes: 1
From: Gunbarrel, Co.
I found a 1970's 9 inch with a 3.50 gear that i rebuilt with a Detroit locker and kept the 3.50 gear. Now after driving around the front range. I should have opted for 3.70 gearing. Around town and on the flats 65 mph and faster no problem, but when it comes to hills I wish I had the 3.70. My T19 has the same gear ratio as the T5 minus 5th gear. I would't put anything higher than 3.50.
Logistics Pro
Joined: Nov 2006
Posts: 3,671
Likes: 367
From: Fallon,NV & Bainbridge OH
The big thing none of you mentioned is rear tire size, the OD of the tire plays a big part in figuring out your overall ratio which in turn effects rpm's. Here is a great tool for figuring out what your final ratio/ rpm's will be.
http://www.f-body.org/gears/
Bryan, when talking about rear axle ratios lower gears are a higher numerical ratio, you had it backward "understand the lower the gear the higher the top end". For example a 4.11 is lower than a 3.50 gear and thus could lower your top speed if your engine can't get the rpm's needed.
Hope this info and the site helps.
http://www.f-body.org/gears/
Bryan, when talking about rear axle ratios lower gears are a higher numerical ratio, you had it backward "understand the lower the gear the higher the top end". For example a 4.11 is lower than a 3.50 gear and thus could lower your top speed if your engine can't get the rpm's needed.
Hope this info and the site helps.
Thread
Thread Starter
Forum
Replies
Last Post
junkyarddog82
1973 - 1979 F-100 & Larger F-Series Trucks
4
Feb 6, 2008 11:13 PM
79Ford460
Clutch, Transmission, Differential, Axle & Transfer Case
10
Apr 18, 2004 10:35 AM
