[updated:LAST EDITED ON 03-Dec-01 AT 01:10 AM (EST)]I have a 1986 Ford F250 Diesel XLT truck and I need help with the following:

I have just changed the factory rear differential (4.11:1) to a 3.54:1. I need to know what has to be done to the speedometer, gear changes, etc.

If parts need to be changed, what are they? Where would be a good place to purchase the parts?

I find that it seems to now be reading wrong and I do not know what to do or what to get to fix it.

Any help will be greatly appreciated.

Also I have a 1986 Ford F250 4.1:1 rear differential with sway bar, hubs and axles for sale. Where is a good place to sell them?

 

Speedo gear to fit the new 3.54 gears.

Simple really.

Dennis

First Came the Chicken,
Then Came the Egg,
Or Was It the Other Way Around?

78 F-150 429CJ C6 ,Silver w/Explorer Pkge
641/2 Mustang,Pre-World's Fair Car #8092
64 Fairlane S/C waiting for a 390-4spd.
68-Mustang.Sunlit Gold 80,000 miles

 

I am brand new to this web site and I do not understand what I should do.

It seems to me that you have an answer to my question, but I was unable to understand the answer which I read. Here is a copy:

"Speedo gear to fit the new 3.54 gears.
Simple really.

Dennis

First Came the Chicken,
Then Came the Egg,
Or Was It the Other Way Around?

78 F-150 429CJ C6 ,Silver w/Explorer Pkge
641/2 Mustang,Pre-World's Fair Car #8092
64 Fairlane S/C waiting for a 390-4spd.
68-Mustang.Sunlit Gold 80,000 miles"

I think this answer was for someone elses question.

Could you please be a little more specific?

Thank You.

Waiting for a reply.

 

You need to go to an auto parts place > perhaps a Ford dealer and get the Speedometer gear that fits on the end of the speedometer cable and goes into the transmission that applies to the new 3.54:1 axle gears you're changing to .


Dennis

First Came the Chicken,
Then Came the Egg,
Or Was It the Other Way Around?

78 F-150 429CJ C6 ,Silver w/Explorer Pkge
641/2 Mustang,Pre-World's Fair Car #8092
64 Fairlane S/C waiting for a 390-4spd.
68-Mustang.Sunlit Gold 80,000 miles

 

Dennis,

Thank you very much, now I understand what you meant in your first reply. Sorry to be so thick sometimes. Thanks again.

Christopher