4.88 vs. 4.30 need help fast - Ford Powerstroke Diesel Forum
 
LinkBack Thread Tools Display Modes
post #1 of 10 Old 08-16-2007, 02:51 AM Thread Starter
Powerstroke.org Rookie
 
Join Date: Aug 2007
Posts: 3
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Exclamation 4.88 vs. 4.30 need help fast

I have read alot on this subject but never got a good answer. I'm getting ready to order a new 08 6.4 F-550 4X4 w/189 wheel base, regular cab and an automatic tranny. This truck will be loaded half the time and unloaded the other half. When it is fully loaded I will have 10,000 to 11,000 pounds on the bed and pulling a 7,000 pound trailer. I do long haul from utah to south dakota and from utah to california, so I will be seeing a decent amount of hills. However I do alot of around town and local driving as well. I'm replacing my 1996 F-superduty (which is really an f-450) and it has the 4.30 rear end and has done o.k. but is on the third tranny. So my question is with all this said and ford just coming out with the new 6.4, which produces a ton more power than my old truck, should I go for a 4.30 or 4.88 rear end? And does anybody have any experience or knowledge on the mpg difference between the two? I'm trying to order asap so any help would be great! Also with the 4.88 rear end ford knocks the power down to 325 horsepower and 600 pounds of torque, but on the 4.30 it stays at the normal 350 hp 650 lb tq.
stoddo is offline  
post #2 of 10 Old 08-16-2007, 02:59 AM
Compression Ignition Addict
 
JoeyCleland's Avatar
 
Join Date: May 2007
Location: Susan Moore, Alabama
Posts: 250
Thanks: 0
Thanked 2 Times in 2 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Send a message via MSN to JoeyCleland
I have 4.10's in mine but completely wish I had 3.73s. If it were me personally i would go with the 4.30s for the following reasons.

1. Better Gas mileage
2. the 4.30 pinion is bigger stronger (thats why the 4.88 has reduced power)
3. More Powerful motor tune
4. Better Gas mileage

The only reason I would go with 4.88's is if I was planning on a big lift/Tires. The worst that could happen with the 4.30's is that you have to downshift on steep hills, but I doubt it with the power that puppy has.

Just my .02

Joey

JoeyCleland is offline  
post #3 of 10 Old 08-16-2007, 03:08 AM
Rob
Super Moderator



 
Rob's Avatar
 
Join Date: Aug 2006
Location: Layton, Utah
Posts: 13,244
Thanks: 3
Thanked 7 Times in 4 Posts
Mentioned: 0 Post(s)
Quoted: 2 Post(s)
Feedback Score: 0 reviews
Send a message via AIM to Rob Send a message via MSN to Rob Send a message via Skype™ to Rob
i think i would go with the 4.30 set up.


Audentes Fortuna Juvat
(Fortune Favors The Bold)
Rwalker@Powerstroke.Org
The Org. Staff reserves the right to
move, modify, delete or merge threads/posts
at our discretion, without explanation
at any time.
Rob is offline  
post #4 of 10 Old 08-16-2007, 04:17 AM
Powerstroke.org Fanatic
 
08F450PSD's Avatar
 
Join Date: Jul 2007
Location: ANKENY,IA
Posts: 136
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Talking

I would go with 4.3 rear end because 4.88 will make engine wine hard and less mpg than the 4.3. I have 4.3 in my F-450 does fine pull my 38ft TT.

2008 F-450 6.4L PSD SD CREW CAB LONB BOX 172 WB RED 4X4 4.3 REAR END, SIRRUS SAT RADIO, LINX SPRAY IN BED LINER AND ACCESS ROLL-UP COVER.
PULL A 38FT FOREST RIVER SIERRA TRAVEL TRAILER 10,500LBS.
OLD TRUCK 06 F-250 6.0L PSD SC SHORT BOX 142 WB
RED FX4.ALSO HAVE HOW 05 F-150 CREW CAB 139WB AND IT'S BLUE AND FX4.
08F450PSD is offline  
post #5 of 10 Old 08-16-2007, 05:36 AM
Compression Ignition Addict
 
StarDriver's Avatar
 
Join Date: Mar 2007
Location: Dahlonega, GA
Posts: 2,857
Thanks: 10
Thanked 13 Times in 11 Posts
Mentioned: 1 Post(s)
Quoted: 1 Post(s)
Feedback Score: 0 reviews
No offense, but if your carrying 10,000-11,000 lbs. on the bed, I's step up to a F-650, get the CAT motor them you have a bigger engine/trans combo to handle the long hauls along with the 22.5 tires to handle the weight better.

2006 F-350 4X4 FX4 Tuscany Longhorn , Leer Custom bed cap, RECON lights, Upfitter switches, Whelen Lighting, Hi-Idle Mod.

Instructor at B.R.A.K.E.S ( www.putonthebrakes.com).

28 years Commercial Driver.

StarDriver is offline  
post #6 of 10 Old 08-16-2007, 05:39 AM
Compression Ignition Addict
 
Join Date: Oct 2006
Location: North of 60
Posts: 232
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
According to my Ford book all 450's and 550 have the 325hp regardless of the gears. For a 550 supercab 4x2 auto with 4:30 the tow rating is 17,000lbs and a GCWR of 26,000lbs. For the same truck with 4:88 the tow rating is 24,000lbs and a GCWR of 33,000lbs. I personally have 4:88 in my truck..i'm not going to lie..at 85mph the truck is at or around 3000rpm. I know when jumping from 4:10 to 4:30's you're looking at about a 150rpm difference at hwy speeds. 4:30's to 4:88 i cant see being any more than a 200-225rpm difference. These trucks also suck on fuel...literally. My truck has around 850miles on it now and according to the computer i'm getting 8mpg..in town or on the hwy..it doesn't really matter.:censord:

08 F-450 Ext Cab 4x4 PSD
Vulcan 882

04 F-250 Ext Cab FX4 Lariat PSD
MBRP 5" Turbo Back w/5-6" Tip
Diablo Sport Predator 100hp

02 2500 Chevrolet Special Service Suburban 6.0

99 Mustang GT
11.86@116mph--shooting for a low 11 this year
all stock

97 CVPI 290000kms still running strong
99gt is offline  
post #7 of 10 Old 08-16-2007, 05:46 AM
Banned
 
Join Date: Sep 2006
Location: Jarrettsville, MD
Posts: 0
Thanks: 0
Thanked 1 Time in 1 Post
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
You will not be even close to legal with that load on a 450. Most 550s can only haul 8,000-9,000 lbs legally. StarDriver is correct, you need a lot more truck to regularly haul those loads. Depending on how the truck is equipped, a 450 can only legally haul 5,000 to 6,000 lbs.

Unless you travel on relatively flat ground, the 4.88 is the only way to go for that much of a load.
720Deere is offline  
post #8 of 10 Old 08-16-2007, 10:47 AM Thread Starter
Powerstroke.org Rookie
 
Join Date: Aug 2007
Posts: 3
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Thanks for all the info

I appreciate the help, this is a pretty cool resource. But in reply to the f-550 being to small I already have an international that hauls larger loads. The f-550 is so I can get into areas in farm areas and not have a huge truck to drive. I figure the 550 will weigh around 8500 pounds after I put my flat bed on. I'm a bee keeper so we just load up as many hives on the thing as is legal, so that would leave me about 10,500 pounds to put on the bed but if I go with a 4.30 rear end then I lose 1100 pounds of payload. the tires on those 550's are also pretty large at 19.5. So do any of you know what kind of mpg difference I could expect between the 4.88 and the 4.30?
stoddo is offline  
post #9 of 10 Old 08-16-2007, 02:53 PM
mjm
Member
 
Join Date: Aug 2007
Posts: 55
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
I have a 450 with 4.88's with 3100 miles on it, mostly highway. I get about 11.7 mpg running over 65. I find when I keep it at 55-60 I get about 12.5 empty. At 60 mph I'm running at 2100+/- RPM's. If you crank out 70 to 74 mph the RPM's are over 2650.
I don't know what a truck with 4.30's would get but i can't imagine it would be huge jump in milage.

Mike
08 F450, 4.88 gears, spartan 210 tune
mjm is offline  
post #10 of 10 Old 08-17-2007, 04:10 AM
Member
 
Join Date: Mar 2007
Location: Corpus Christi
Posts: 86
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Mine has 4.88's in it also. I use it for pulling only, either a 10,000lb boat or a 14,000lb 5th wheel. I get around 9.0 to 9.3 running 75mph and it has no problem maintaining 75mph uphill loaded. I have thought about adding a Gear Vendors overdrive unit, but at about $3500, it would take forever to pay for itself even if it improved the mileage by 2mpg, which I seriously doubt that it would.

2002 F350 DRW

2015 F150 Ecoboost 4X4

2013 Fusion Platinum

1978 F150 Super Cab 4X4
jason1168tx is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Ford Powerstroke Diesel Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome