• Welcome Visitor! Please take a few seconds and Register for our forum. Even if you don't want to post, you can still 'Like' and react to posts.

14 to 15" wheel & tire change


kimfish1

New Member
Joined
Jun 1, 2012
Messages
6
Reaction score
0
Points
0
Vehicle Year
1998
Make / Model
Ford
Transmission
Automatic
In changing from stock 225/70r14 to 235/75r15, the diameter will increase 26.4 to 28.88", circumference from 82.9 to 90.7". What will I need to do to keep speedo accurate and not compromise the tranny (4R44E) automatic or the computer? The new wheels will set out 1" farther which is actually a bonus and clearance is not a problem. Thanks to anyone who can help.
 


lil_Blue_Ford

lil_Blue_Ford

Well-Known Member
TRS Forum Moderator
Supporting Member
V8 Engine Swap
TRS 20th Anniversary
TRS Event Participant
Joined
Aug 6, 2007
Messages
8,299
Reaction score
6,099
Points
113
Location
Butler, PA, USSA
Vehicle Year
95
Make / Model
Ford
Engine Size
4.9L
Transmission
Manual
There are calculators in the tech pages for determining what exactly the effects of the change will be.

IMHO, the real thing to watch for would be what gears you have and what engine. My 88 BII I ran the stock tires (215/70/15) with 3.73 gears, a4ld trans and 2.9L motor. My 89 BII (which I sold, wish I would have kept it) had 235/75/15 tires, 3.73 gears, a4ld trans and 2.9L motor and was just fine with that setup (AFTER I did a much-needed tune-up, seems the previous owner did not believe that they needed maintenance very often - if ever - in the roughly 220,000 miles before I got it).

My 00 Ranger had 225/70/15 tires stock, 3.73 gears, 3.0L motor and a 5-speed stick, I swapped to 235/75/15 tires and when I checked the speedo, I found that it had actually corrected it (it read a little off from the factory).

My 95 F-150 had 235/75/15 tires stock, 3.08 gears, 4.9L motor and a 5-speed (and was a dog). I changed to 31x10.5x15 tires (and it was an even worse dog) then changed to 3.55 gears which corrected the speedo and gave me the power I wanted.
 
You must log in or register to reply here.

Sponsored Ad


Sponsored Ad

Staff online

Members online

Total: 767 (members: 9, guests: 758)

Today's birthdays

Member & Vendor Upgrades

For a small yearly donation, you can support this forum and receive a 'Supporting Member' banner, or become a 'Supporting Vendor' and promote your products here. Click the banner to find out how.

Latest posts

Truck of The Month


Shran
April Truck of The Month

Recently Featured

Want to see your truck here? Share your photos and details in the forum.

Follow TRS On Instagram

Latest Album Photos

Hunters
20240409_190831.jpg
20240409_190818.jpg
20240409_180824.jpg
20240409_182648.jpg
20240409_181010.jpg
20240408_175026.jpg
99 Ranger
20200706_161414.jpg
20240207_155117.jpg
20240207_155111.jpg
20240207_154537 - Copy.jpg

TRS Events

25th Anniversary Sponsors

Check Out The TRS Store


Sponsored Ad


Sponsored Ad

Sponsored Ad


Amazon Deals

Top