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03-29-2013, 02:43 PM
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#1
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Junior Member
Join Date: Mar 2013
Location: Sewell,NJ
Posts: 17
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updating rearend from 3.5 to 3.93-how much will it help??
I am thinking of putting a 3.93 rear in my F150 from a 3.55. How much will this boost my tow capacity if at all. any thoughts???
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03-29-2013, 03:14 PM
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#2
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Senior Member
Join Date: May 2011
Location: Full-timing
Posts: 447
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Your official tow capacity? None. Your actual towing capacity, maybe a little more than none, depending on what your problem is. If you are within the manufacturer's tow ratings but need a little more power then the ratio change will help a little, but that's about it.
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03-29-2013, 03:18 PM
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#3
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Junior Member
Join Date: Mar 2013
Location: Sewell,NJ
Posts: 17
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Thanks for the reply!! I am within the manufactueres tow rating but at the high end of my limits! I was thinking this would be a good soultion since I can't afford a new truck and a new trailer and the rear would only be about $1000-1500.!!
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03-29-2013, 05:41 PM
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#4
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Senior Member
Join Date: Feb 2013
Location: Central Oregon
Posts: 120
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New rear end gears will help a lot but I would go with something closer to 4.30s if you can. I don't know what the rest of your truck has but if it has a 6-speed tranny you won't loose much on the top end (MPGs). Just going from 3.55 to 3.93 won't help much. Not worth the money IMHO.
__________________
2016 Ram CTD 4x4 CC
2016 Forest River Surveyor
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03-29-2013, 06:12 PM
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#5
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Senior Member
Join Date: May 2012
Location: North Florida
Posts: 1,241
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There will be some noticeable difference IMO in starts from a dead stop but 4.10 or 4.30 would make a bigger difference and keep you higher in the RPM range at speed making the truck more responsive and result in less downshifting of the tranny.
__________________
2006 Keystone Hornet 29RLS (The Cracker Cabana)
2009 F-250 SuperDuty CC 6.8L/4.10 (The Black Pearl)
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03-29-2013, 08:00 PM
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#6
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Junior Member
Join Date: Mar 2013
Location: Sewell,NJ
Posts: 17
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thanks for the good info!! forgive my lack of knowledge int rear ends but will the bigger gears in a 4.30 fit in the current rear?? I know next to nothing about rear end gears
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03-29-2013, 09:01 PM
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#7
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Senior Member
Join Date: Feb 2013
Location: Central Oregon
Posts: 120
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Quote:
Originally Posted by Mgmfallon1019
thanks for the good info!! forgive my lack of knowledge int rear ends but will the bigger gears in a 4.30 fit in the current rear?? I know next to nothing about rear end gears
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They will fit but you need to find out what gears are actually offered for the rear end in your truck. They may not be exactly 4.30 but something close.
__________________
2016 Ram CTD 4x4 CC
2016 Forest River Surveyor
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03-30-2013, 06:56 AM
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#8
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Senior Member
Join Date: Mar 2013
Location: Silvis, IL
Posts: 262
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Keep in mind of you have a 4x4 truck you will have to regear the front diff as well if you plan on using the 4x4 function of your truck. So be sure to factor that cost as well.
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2013 Passport Elite 23RB
2012 Ford F150 EcoBoost 4x4
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03-30-2013, 10:30 AM
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#9
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Senior Member
Join Date: Jan 2011
Location: Austin, Tx
Posts: 1,910
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The 4X4 does make it a double whammy and if your truck has the 5.4L, which wasn't a powerhouse to begin with, the net gain is going to be negligible. I would sock that money back towards the down payment on your next truck.
__________________
2011 Outback 277RL
2013 F250 XLT Crew Cab 6.2L
Bitter Gun Owner
Bitter Clinger
Armed Infidel
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04-26-2013, 08:02 AM
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#10
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Junior Member
Join Date: Apr 2013
Location: Abilene TX
Posts: 20
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On my 2012 Ram 1500 with 3.55 gears my tow rating is 8500. If it came factory with 3.94 gears it would have been 10500.
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05-04-2013, 01:57 PM
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#11
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Senior Member
Join Date: Jan 2011
Location: Austin, Tx
Posts: 1,910
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Live with the truck and save the $1000 for a down payment on another truck. The gear change will give a little more pulling power, but you will have spent $1000 on a 1/2 ton truck and still have a 1/2 ton truck with all of it's shortcomings and you aren't going to change any of the capacities.
__________________
2011 Outback 277RL
2013 F250 XLT Crew Cab 6.2L
Bitter Gun Owner
Bitter Clinger
Armed Infidel
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