Tires
Moderator
Joined: Jan 2001
Posts: 56,966
Likes: 2,728
From: Virginia
Originally Posted by 86F150302
Yea I knew that.
What would be a good tire brand to look into? I would like a cheaper brand street tire. Any brand I should look into so i can check out their site?
What would be a good tire brand to look into? I would like a cheaper brand street tire. Any brand I should look into so i can check out their site?
Thread Starter
|
Postmaster
Joined: Dec 2007
Posts: 3,052
Likes: 1
From: Jacksonville FL
I really like the BFG radial T/A but I dont like the price 
Might have to keep mine untill they need replacing then buy new ones. I was planning on selling these to a friend then buying new ones because mine are almost brand new.
http://www.walmart.com/catalog/produ...ex=&tire_size=
Might have to keep mine untill they need replacing then buy new ones. I was planning on selling these to a friend then buying new ones because mine are almost brand new.http://www.walmart.com/catalog/produ...ex=&tire_size=
Posting Guru
Joined: Jun 2002
Posts: 2,091
Likes: 3
From: Suffolk, VA USA
Sorry it took a bit to get back to you...
Assuming everything in your truck is original you have an AOD transmission with a 3.55 rear axle.
Given this your truck came stock with a 19 tooth speedometer drive gear. To get the speedometer correct with the 235/75 15s you'll need to get an 18 tooth gear...this makes sense as the general rule of thumb is a 5% change in speedometer readings per gear tooth. If you go with the 255/60 15s mentioned earlier the math puts you between two gear sizes, but a 20 tooth gear will give you the closest to accurate speedometer reading.
Assuming everything in your truck is original you have an AOD transmission with a 3.55 rear axle.
Given this your truck came stock with a 19 tooth speedometer drive gear. To get the speedometer correct with the 235/75 15s you'll need to get an 18 tooth gear...this makes sense as the general rule of thumb is a 5% change in speedometer readings per gear tooth. If you go with the 255/60 15s mentioned earlier the math puts you between two gear sizes, but a 20 tooth gear will give you the closest to accurate speedometer reading.
Thread Starter
|
Postmaster
Joined: Dec 2007
Posts: 3,052
Likes: 1
From: Jacksonville FL
Originally Posted by ri_truck_guy
Sorry it took a bit to get back to you...
Assuming everything in your truck is original you have an AOD transmission with a 3.55 rear axle.
Given this your truck came stock with a 19 tooth speedometer drive gear. To get the speedometer correct with the 235/75 15s you'll need to get an 18 tooth gear...this makes sense as the general rule of thumb is a 5% change in speedometer readings per gear tooth. If you go with the 255/60 15s mentioned earlier the math puts you between two gear sizes, but a 20 tooth gear will give you the closest to accurate speedometer reading.
Assuming everything in your truck is original you have an AOD transmission with a 3.55 rear axle.
Given this your truck came stock with a 19 tooth speedometer drive gear. To get the speedometer correct with the 235/75 15s you'll need to get an 18 tooth gear...this makes sense as the general rule of thumb is a 5% change in speedometer readings per gear tooth. If you go with the 255/60 15s mentioned earlier the math puts you between two gear sizes, but a 20 tooth gear will give you the closest to accurate speedometer reading.
Posting Guru
Joined: Jun 2002
Posts: 2,091
Likes: 3
From: Suffolk, VA USA
AOD is an Automatic Overdrive transmission...from the documentation I can find Ford only used the C4 in trucks for a realtively short period, mostly in the 70's...if I remember right they stopped in the late 70s/very early 80s...like maybe 81 at the latest...I had a 77 F100 with one. The AOD was a follow on tranny to the C4 with an overdrive gear added for better fuel economy. It takes a beating on here opinion wise, but the couple that I've had, including my current truck have held up pretty well. Best way to confirm your tranny is too look at the tranny fluid pan and count the bolts. If you have 14 bolts its an AOD, 17 bolts its a C6, and 11 bolts could be either a C4 or C5. The AOD is what your truck what was built with...unless you know the whole history of it who knows what someone might have put in...one of the joys of owning an older truck...I'm doing body work on mine right now and although the truck looked pretty good it's amazing the crap I've found under the old paint this week....
Thread Starter
|
Postmaster
Joined: Dec 2007
Posts: 3,052
Likes: 1
From: Jacksonville FL
Originally Posted by ri_truck_guy
AOD is an Automatic Overdrive transmission...from the documentation I can find Ford only used the C4 in trucks for a realtively short period, mostly in the 70's...if I remember right they stopped in the late 70s/very early 80s...like maybe 81 at the latest...I had a 77 F100 with one. The AOD was a follow on tranny to the C4 with an overdrive gear added for better fuel economy. It takes a beating on here opinion wise, but the couple that I've had, including my current truck have held up pretty well. Best way to confirm your tranny is too look at the tranny fluid pan and count the bolts. If you have 14 bolts its an AOD, 17 bolts its a C6, and 11 bolts could be either a C4 or C5. The AOD is what your truck what was built with...unless you know the whole history of it who knows what someone might have put in...one of the joys of owning an older truck...I'm doing body work on mine right now and although the truck looked pretty good it's amazing the crap I've found under the old paint this week....
thought the BOLD D was OD and the D was drive
What speed is the AOD? 4 speed?
Senior User
Joined: Sep 2004
Posts: 200
Likes: 0
From: Cathedral City
Here's a web site that will do all the math for you. Just plug in the original tire size, 215/75X15.
Then you can play around with different sizes and keep close to the original diameter.
That way it doesn't effect your speedometer to much.
I used it when I went from 15" wheels to 18" wheels. Went from 70 series tires to 50's.
I found a tire size that was within 1% of original. So my speedometer reads 60 when I'm doing 59.8.
http://www.miata.net/garage/tirecalc.html
Then you can play around with different sizes and keep close to the original diameter.
That way it doesn't effect your speedometer to much.
I used it when I went from 15" wheels to 18" wheels. Went from 70 series tires to 50's.
I found a tire size that was within 1% of original. So my speedometer reads 60 when I'm doing 59.8.
http://www.miata.net/garage/tirecalc.html
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Top 10 Ford Trucks Coming to Mecum Indy 2026
Brett Foote
5 Best / 5 Worst Ford Truck Wheels of All Time
Joe Kucinski
Posting Guru
Joined: Jun 2002
Posts: 2,091
Likes: 3
From: Suffolk, VA USA
It's a three speed automatic with an extra overdrive. If your set your shift lever to D it will drive like a three speed automatic. If you set it to bold D the fourth overdrive gear will kick in when you hit a steady speed over 45 mph. If you drive the truck in bold D you'll notice it kick in and out of overdrive depending on the engine load.
Thread Starter
|
Postmaster
Joined: Dec 2007
Posts: 3,052
Likes: 1
From: Jacksonville FL
Originally Posted by ri_truck_guy
It's a three speed automatic with an extra overdrive. If your set your shift lever to D it will drive like a three speed automatic. If you set it to bold D the fourth overdrive gear will kick in when you hit a steady speed over 45 mph. If you drive the truck in bold D you'll notice it kick in and out of overdrive depending on the engine load.
Moderator
Joined: Nov 2007
Posts: 22,415
Likes: 92
From: Denver Metro Area, CO
I have a 1981 Shop Manual, it's the only place I have to look up these codes. I'll bet you could take your information to the Parts dept. of your local Ford dealer, they'd be authoritative....
-ct
-ct
Thread
Thread Starter
Forum
Replies
Last Post
Orange84
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
12
Jun 16, 2013 04:57 PM
TheKirbyMan
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
21
Sep 21, 2009 11:29 PM
uncleben03
Explorer, Sport Trac, Mountaineer & Aviator
8
Jul 11, 2005 09:53 PM
88f150*300
Brakes, Steering, Suspension, Tires, & Wheels
8
Nov 1, 2003 07:36 AM
