MPG's
Thread Starter
|
New User
Joined: Mar 2008
Posts: 10
Likes: 0
MPG's
Hi Everyone
I have 83 f100 4x2 stepside w/300 and a t-18 running 265.75r15's,
I hardly use 1st and do mostly highway and cruise about 70-75, I do pull a 6x12 enclosed trailer once in a while
Still trying to get a grip on ring and pinion's ratios
I'd like to upgrade to disc and get the rpm's down
Is there a good axle swap that will allow me to use 1st and keep the rpm's low in 4th
And get my disc's?
Thank You for any advice
I have 83 f100 4x2 stepside w/300 and a t-18 running 265.75r15's,
I hardly use 1st and do mostly highway and cruise about 70-75, I do pull a 6x12 enclosed trailer once in a while
Still trying to get a grip on ring and pinion's ratios
I'd like to upgrade to disc and get the rpm's down
Is there a good axle swap that will allow me to use 1st and keep the rpm's low in 4th
And get my disc's?
Thank You for any advice
Posting Guru
Joined: Oct 2010
Posts: 1,199
Likes: 1
From: Missouri
The axle ratio isn't the reason that you don't hardly use first, the T18 has a granny first gear. It is (I believe) a 6.32 ratio in first.
For comparison, a T-5 5-Speed Mustang transmission with a fully usable 1st gear has from either a 2.95 or 3.35 ratio depending on the year. 2nd Gear on the T18 is somewhere in that area.
For comparison, a T-5 5-Speed Mustang transmission with a fully usable 1st gear has from either a 2.95 or 3.35 ratio depending on the year. 2nd Gear on the T18 is somewhere in that area.
Senior User
Joined: Sep 2009
Posts: 459
Likes: 0
The axle ratio isn't the reason that you don't hardly use first, the T18 has a granny first gear. It is (I believe) a 6.32 ratio in first.
For comparison, a T-5 5-Speed Mustang transmission with a fully usable 1st gear has from either a 2.95 or 3.35 ratio depending on the year. 2nd Gear on the T18 is somewhere in that area.
For comparison, a T-5 5-Speed Mustang transmission with a fully usable 1st gear has from either a 2.95 or 3.35 ratio depending on the year. 2nd Gear on the T18 is somewhere in that area.
Cargo Master
Joined: Aug 2007
Posts: 2,561
Likes: 69
From: New Zealand
I would decide what ideal roadspeed & rpm's you want at the top end, then work back from there using the mph/rpm calculator in 'Articles/Specs' at the top of the page, to get your diff ratio.
Elder User
Joined: Apr 2009
Posts: 725
Likes: 2
2.75 or 3.00 would prolly do what you ask.
2111 RPM @ 70mph w/2.75 and your tires
2303 RPM @ 70mph w/3.00 and your tires
Those are both available for the 9"
2365RPM @ 70mph w/3.08 and your tires
available with the 8.8, which has discs.
2111 RPM @ 70mph w/2.75 and your tires
2303 RPM @ 70mph w/3.00 and your tires
Those are both available for the 9"
2365RPM @ 70mph w/3.08 and your tires
available with the 8.8, which has discs.
Cargo Master
Joined: Oct 2005
Posts: 2,302
Likes: 29
From: NJ
Don't try to make first gear useful in normal driving. It's there for towing and off road. It's also not synchronized, so if you want to use it all the time you better get real good at double clutching, which can be difficult to learn when you're working a huge gear spread.
Your best solution is a ZF5. Easy bolt in swap gets you a .76:1 overdrive gear.
As for disk brakes in the rear... I think that's just not necessary and a waste of money unless you're pulling some serious weight around. You've got a small lightweight truck that shouldn't have any trouble stopping even with your small trailer... I know my '83 Stepside didn't when I pulled larger trailers.
Your best solution is a ZF5. Easy bolt in swap gets you a .76:1 overdrive gear.
As for disk brakes in the rear... I think that's just not necessary and a waste of money unless you're pulling some serious weight around. You've got a small lightweight truck that shouldn't have any trouble stopping even with your small trailer... I know my '83 Stepside didn't when I pulled larger trailers.
Thread
Thread Starter
Forum
Replies
Last Post
hasteranger
1973 - 1979 F-100 & Larger F-Series Trucks
1
May 30, 2012 12:18 PM
1995 F250 460 HD
1987 - 1996 F150 & Larger F-Series Trucks
15
Oct 3, 2007 11:43 AM
