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95 XL with EFI 5.8 (Automatic)
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Discussion Starter · #1 ·
I currently have stock gearing and 31" tires. I plan to go to 35's in the future so I was curios if 4.11 is ok or not? I mostly use it for off roading here in the sierra mountains in California. I do take it for a town drive here and there but nothing crazy. At times I tow with it, but again, nothing crazy. I was recommended anything between a 4.10 and a 4.56.

any thoughts?
 

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Man of endless projects
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i myself perfer 4.88 for 35s, espeiaclly for towing, climbing, offroading in general. but 4.56 is considered the norm. only reason id do 4.10 is if you are saving money by using a D50/D44HD third member in the front that came factory 4.10 but id still consider that too low

the advantage of overdrive transmissions like E4OD is that you can go with a stupid high ratio and still turn less rpm than a non-overdrive trans like a C6. so id take advantage of that and run the higher ratio and gain alot of torque

for example a truck that has a C6 trans and 3.55 ratio and 35" will in a perfect world see about 2216rpm at 65mph. but this is not a perfect world and C6 will have converter slippage of a couple hundred rpm so more like ~2400rpm @ 65mph.
now lets take a E4OD with a lockup converter and OD ratio of 0.71 ratio. with that OD ratio, 65mph 4.88 gear and 35s is about 2162rpm and no slippage due to converter lockup.
just as a point, with an E4OD trans, 5.38 gears, 35s and 65mph would be about 2384rpm, around what the C6 would be at highway speed but be a stump puller at low speed. but that would be overkill of axle ratio for most scenarios

dont fear the gear. these engines were originally designed to run around 3k rpm for long distances on highway. for example a stock truck with 29" tires, C6 trans, and 3.55 ratio would be running around 2675rpm at 65mph before converter slippage. more like 2800-2900 in real world

heres a generic chart. ignore the colors. you would multiply these numbers by 0.71 to find out what rpm you would be at with E4OD
 

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Premium Member
1987 Bronco 351W, C6
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Yeah, you have Overdrive, so 4.56 or 4.88 depending on your intended usage, 4.11 on 35s is less than 3.55 on 31s
 

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These guys have it. 4.56 or 4.88. If you have ANY thoughts about POSSIBLY going to a 36 or 37" tire in the future, then definitely 4.88's!
 

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95 XL with EFI 5.8 (Automatic)
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Discussion Starter · #6 ·
These guys have it. 4.56 or 4.88. If you have ANY thoughts about POSSIBLY going to a 36 or 37" tire in the future, then definitely 4.88's!
I plan on 35's as my max ever. I dont even think it will fit in my garage anymore after the 35's lol.
 

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95 XL with EFI 5.8 (Automatic)
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Discussion Starter · #7 ·
i myself perfer 4.88 for 35s, espeiaclly for towing, climbing, offroading in general. but 4.56 is considered the norm. only reason id do 4.10 is if you are saving money by using a D50/D44HD third member in the front that came factory 4.10 but id still consider that too low

the advantage of overdrive transmissions like E4OD is that you can go with a stupid high ratio and still turn less rpm than a non-overdrive trans like a C6. so id take advantage of that and run the higher ratio and gain alot of torque

for example a truck that has a C6 trans and 3.55 ratio and 35" will in a perfect world see about 2216rpm at 65mph. but this is not a perfect world and C6 will have converter slippage of a couple hundred rpm so more like ~2400rpm @ 65mph.
now lets take a E4OD with a lockup converter and OD ratio of 0.71 ratio. with that OD ratio, 65mph 4.88 gear and 35s is about 2162rpm and no slippage due to converter lockup.
just as a point, with an E4OD trans, 5.38 gears, 35s and 65mph would be about 2384rpm, around what the C6 would be at highway speed but be a stump puller at low speed. but that would be overkill of axle ratio for most scenarios

dont fear the gear. these engines were originally designed to run around 3k rpm for long distances on highway. for example a stock truck with 29" tires, C6 trans, and 3.55 ratio would be running around 2675rpm at 65mph before converter slippage. more like 2800-2900 in real world

heres a generic chart. ignore the colors. you would multiply these numbers by 0.71 to find out what rpm you would be at with E4OD

Hey thank you so much for the info! the only down side at the moment is that I need a new transmission lol. My E4OD went out Sunday. SO it will be rebuilt and upgraded. I plan to throw a punisher valve body kit on there as well. and apparently they will use a alto performance clutch kit so i'm hoping to see improvements in general! I'm still new to all this but do switching a clutch plate from 4 to 5 affect anything in gearing in the rear? I assume not but i rather ask a dumb question to make sure.
 

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95 XL with EFI 5.8 (Automatic)
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Discussion Starter · #8 ·
@Kingfish999 I have one last question, base on the chart * (.71), can i upgrade to the 4.88 now and keep my 31's till they wear out, or what cons will i see? I got an rpm estimate of 2400-ish. and my 31's are only 7 months old, maybe no more than 500 miles. I know for sure no more than 1000 on them.
 

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95 5.8L MAF XLT, Hedman Shorties/MF SS Y & Muff, E4OD, Man hubs, KYB Quads, 31x10.5x15, 304K miles
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You have the chart now so multiply the rpm in the chart by .71 to get your rpm in 4th with the 4.88 and 31". Now go and play!!!!
 

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Man of endless projects
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at 65mph you will be around 2440rpm. it will feel high and you might not like it, but its still less than an average C6 truck. i myself would find that very driveable. i am running 4.56 with 32s in my F250 for years and kinda regretted not going 4.88 for towing
 

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If it is not a Bronco, it's just not worth driving.....
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Do not go with 4.11 gearing. I run 4.11 gears and I regret getting this gear ratio. It is geared too high. My truck bogs down too easily. I would go with the 4.56 or lower.
 

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I’d like to know how you plan on running 35’s with a 2 inch lift? Or am I missing something? Are later model broncos able to fit without major scrubbing?
 

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78 & 92
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The only issue with running the 4.88's and the 31's is that when you go to 35's you will have been used to how the truck is with the 31's... therfore you may not like it.
 
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95 XL with EFI 5.8 (Automatic)
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Discussion Starter · #16 ·
I’d like to know how you plan on running 35’s with a 2 inch lift? Or am I missing something? Are later model broncos able to fit without major scrubbing?
apparently its possible so idk haha. I mean I can always ask a shop to do one front tire and see if it will rub any where. I don't mind trimming anything down.
 

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1995 EB, 351W, Auto, Stock (for now)
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22 Posts
Got any pics with the 2" lift? Sorry, I'm no help on your other questions.
 
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