changing rear gears
Thread Starter
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Elder User
Joined: Aug 2003
Posts: 952
Likes: 1
From: iowa
changing rear gears
is this a hard thing to do, changeing the rears ? i was thinking about that myself, i would like a little less rpm at highway speeds. i tach about 2800 at 70 mph. I can build a engine and switch out any parts i need to. but never played with the rear end. and i am talking about the truck in my sig and gallery. And any idea of the cost of this. And what would you suggest for gears ?
Post Fiend
Joined: Nov 2001
Posts: 14,947
Likes: 6
From: Topsfield, MA
What gears and tires do you have now? What tranmission (od?)? It's a difficult job and is one that is best left to the mechanics if you havn't done it before. I just did it on my truck, it was difficult but I spent 8-9 months slowly gathering information and techniques to learn how.
Thread Starter
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Elder User
Joined: Aug 2003
Posts: 952
Likes: 1
From: iowa
Model Year: 70
Series: F250 - 4x2 Pickup Camper Special
Engine: 8 Cyl, 360ci, 2bbl
Assembly Plant: San Jose
Transmission: C6
Rear Axle: 3.73 5200lb Dana 60
this is all the info i have decoded from my door tag.
running 16 inch tires.
any of this help ?
Series: F250 - 4x2 Pickup Camper Special
Engine: 8 Cyl, 360ci, 2bbl
Assembly Plant: San Jose
Transmission: C6
Rear Axle: 3.73 5200lb Dana 60
this is all the info i have decoded from my door tag.
running 16 inch tires.
any of this help ?
Post Fiend
Joined: Nov 2001
Posts: 14,947
Likes: 6
From: Topsfield, MA
If you do infact have 3.73s (maybe someone changed it?) you'll be running 2569 RPM at 65 mph. You're going to lose a fairly significant amount of power if you drop ratios. It'll cost you approx. $300 just for parts, and it is a very precise setup so I don't suggest doing it yourself if you've never done it before. Unless you spend a lot of time on the highway, I don't think it's worth it.
Thread Starter
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Elder User
Joined: Aug 2003
Posts: 952
Likes: 1
From: iowa
i take my truck once in a while on a road trip but usually it is 13 miles to work and 13 miles back and just around town. 300 bucks sounds like alot to just get a little less rpm at highway speeds i was hoping it be a quick thing, i guess it is not, bummer
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Senior User
Joined: Sep 2003
Posts: 122
Likes: 0
I have an 86 with a 6.9 , 4 spd, 3;55 and it seems to be taking pretty high at 70 mph, I don't know what it is taching, tach is broke, anyways how much difference would 4;11s make
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