Information on swapping rear end?
Thread Starter
|
New User
Joined: Dec 2014
Posts: 4
Likes: 0
Information on swapping rear end?
So my 1982 F150 had a 3 speed C6, great transmission, but I located a NP435 4 speed cheap and decided to swap in hopes to get better highway. Little did I know the 4 speed was a granny gear 4 speed.. I'm able to start the truck from a dead stop in 3rd gear.. So now I've decided to swap the rear end but don't know where to start
My truck is a 1982 F150 short bed 2wd with a 300ci Inline 6 and a 1985 NP435 with a 4.10 rear end
What would be a good rear end ratio to use?
I want good fuel economy. I barely ever tow, but I'd like to maintain some of my towing ability, but with the inline 6 being so torquey I assume going to a different rear end will not completely hinder my towing ability. But my overall goal is to be in 4th doing highway speeds at a low rpm.. I was thinking a 3.25 rear end would do since I have the granny gear, maybe even a 2.75, what do you guys think? What rear ends are available for my f150 and would bolt right in?
Basically what are my options to accomplish my goal?
-ccsbivens
My truck is a 1982 F150 short bed 2wd with a 300ci Inline 6 and a 1985 NP435 with a 4.10 rear end
What would be a good rear end ratio to use?
I want good fuel economy. I barely ever tow, but I'd like to maintain some of my towing ability, but with the inline 6 being so torquey I assume going to a different rear end will not completely hinder my towing ability. But my overall goal is to be in 4th doing highway speeds at a low rpm.. I was thinking a 3.25 rear end would do since I have the granny gear, maybe even a 2.75, what do you guys think? What rear ends are available for my f150 and would bolt right in?
Basically what are my options to accomplish my goal?
-ccsbivens
Super Moderator
Joined: Apr 2004
Posts: 34,535
Likes: 2,836
What size tire are you running? With the six and that granny first, you can pull a seriously tall ratio if major towing is not on the menu. BUT a big tall tire is a major factor, so tire size has to be figured into the mix.
Thread Starter
|
New User
Joined: Dec 2014
Posts: 4
Likes: 0
I found a guy that has the gears for a 3.00:1 rear end that goes to a Ford 9" rear end that he'll give me for free. My door sticker is missing but I'm pretty confident my rear end is a 9". If my rear end is a 9", how difficult would it be to swap the gears? Cause my rear end works fine and I just rebuilt the brakes, however I've never fooled with the internals of the rear end. The only used rear ends I can find is a 3.55:1, 3:75:1, and the 4.10:1
Or would a 3.55:1 put me in the rpm range I want?
-Ccsbivens
Super Moderator
Joined: Apr 2004
Posts: 34,535
Likes: 2,836
I just have the stock 15" rims with regular truck tires, nothing fancy.
I found a guy that has the gears for a 3.00:1 rear end that goes to a Ford 9" rear end that he'll give me for free. My door sticker is missing but I'm pretty confident my rear end is a 9". If my rear end is a 9", how difficult would it be to swap the gears? Cause my rear end works fine and I just rebuilt the brakes, however I've never fooled with the internals of the rear end. The only used rear ends I can find is a 3.55:1, 3:75:1, and the 4.10:1
Or would a 3.55:1 put me in the rpm range I want?
-Ccsbivens
I found a guy that has the gears for a 3.00:1 rear end that goes to a Ford 9" rear end that he'll give me for free. My door sticker is missing but I'm pretty confident my rear end is a 9". If my rear end is a 9", how difficult would it be to swap the gears? Cause my rear end works fine and I just rebuilt the brakes, however I've never fooled with the internals of the rear end. The only used rear ends I can find is a 3.55:1, 3:75:1, and the 4.10:1
Or would a 3.55:1 put me in the rpm range I want?
-Ccsbivens
Thread
Thread Starter
Forum
Replies
Last Post
One79one71
1973 - 1979 F-100 & Larger F-Series Trucks
9
May 24, 2017 11:39 AM
49F3monster
1948 - 1956 F1, F100 & Larger F-Series Trucks
4
Aug 25, 2001 05:00 PM
