Rear gears
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Junior User
Joined: Jun 2002
Posts: 54
Likes: 0
From: Covington,TN
Rear gears
I have a 95 PSD F350 with 4:10 gears and 5 speed. On the highway at 70 it turns around 2500 with 235/85r16.I am thinking about looking for a used 10.25 rear end with either a 3.73 or 3.55. I usually only tow about 5000 lbs (RV) but may tow up to 10,000. Is there a huge power loss with those high rear gears like on hills at speed. I thought about a gear vendors over/under but at 3500 its out of my range. I am trying to lower my highway RPM's and boost mileage.
FTE Leadership Emeritus
Joined: May 2001
Posts: 13,653
Likes: 6
From: Cabot, Arkansas
Wouldn't it be less expensive to put a little taller tire on it. You won't otice much difference between the 4.10 and the 3.73. The 3.55's might be a bit tall for heavy loads, but will be fine for the little RV.
Senior User
Joined: Apr 2003
Posts: 424
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From: Northern IL
From what I have seen and heard from others with the same truck as I, you will only gain about 1mpg going to 3.73's. 3.55's were not an option on my year so i do not know on those. I think cookie88's idea on changing tire size would be the most cost effective.
Freshman User
Joined: Oct 2002
Posts: 43
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From: Boerne USA
3.55s are too high if you pull heavy loads. when i haul hay i wish i had a 3.73 or 4.10 but when i can turn alittle over 2000 rpms at 70mph i can deal with it. mines a 1995 too. all stock except downpipe and staight pipe and get 20-21 boost at 3000 rpms in 5th. what about you?
Last edited by bud465; Feb 20, 2004 at 09:38 PM.
New User
Joined: Jun 2003
Posts: 7
Likes: 0
From: Motor City
I am taking out my 3:73's shortly (2002 4 WD, dana 60 front, 10.5 rear).
My truck is lifted and I'm running 35's which are about 10% taller than stock.
You can have them (you pay for freight) if they will work for you.
Brad
bschmidt61@comcast.net
My truck is lifted and I'm running 35's which are about 10% taller than stock.
You can have them (you pay for freight) if they will work for you.
Brad
bschmidt61@comcast.net
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Junior User
Joined: Jun 2002
Posts: 54
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From: Covington,TN
Thanks all for the great info. I'm not sure if the 2002 rear ring and pinion will work. I'll check and get back with you. I may be interested. Also I run a straight pipe (6' chrome) and I do feel a power increase and besides the sound is great.
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