Need Help W/ Ls Axle ?
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New User
Joined: Feb 2006
Posts: 19
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Need Help W/ Ls Axle ?
I Have A '94 E150 5.8,e4od,3.55 Reg. Axle,4w Abs, Van.
Want To Put In A 3.73 Limitted Slip Axle.
Can Anyone Help W/ What To Look For,year,model And
Any Other Thoughts.
Thanks In Advance, Carson
Want To Put In A 3.73 Limitted Slip Axle.
Can Anyone Help W/ What To Look For,year,model And
Any Other Thoughts.
Thanks In Advance, Carson
Post Fiend
Joined: Mar 2002
Posts: 19,402
Likes: 38
From: Bonita Springs FL
Why do you want to do this? Going from 3.55 to 3.73 is barely going to be noticable at all. If you just want the LS, then there are lots of options - but it depends on what you're going to use the van for.
Cargo Master
Joined: Aug 2004
Posts: 2,899
Likes: 2
From: Lynnwood, WA
Finding an 8.8" axle with 3.73 gears may be a bit (?!) difficult. I think the OEM ratios were 3.55, 4.11, and a couple of highway ratios, but nothing between the 3.55 and 4.11.
So your only realistic option is to redo your axle. Make it LS and change the gears. But it won't be cheap, especially if you have to pay someone.
So your only realistic option is to redo your axle. Make it LS and change the gears. But it won't be cheap, especially if you have to pay someone.
Post Fiend
Joined: Nov 2001
Posts: 14,947
Likes: 6
From: Topsfield, MA
There were no 3.73s...or 4.10s (lightning only). The most popular ratios are 3.08 and 3.55....with 2.73 and 3.31 as rare options.
You'd have to buy 3.73s and put them in if that is what you want.
You'd have to buy 3.73s and put them in if that is what you want.
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New User
Joined: Feb 2006
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Thanks for all of your posts.
I plan on using the van for surf trips to Baja,and some of it
will be off road,sand and such.So I want to put some
BFGoogrich T/A KO tires on,taller and wider.I was afrad
that the ratio would get out of wack
When I looked at the '94 van owner guide that came with
it,it shows that thir is a dana 3.73 L/S ,I looked just now
and it must be a E250 becase it is a 5,400 lb.
If money was not a problem I would buy a new Sportsmoble
4x4 but such is not the case,so does anybody have any
ideas. I drive van every day for work.
Thanks Carson
I plan on using the van for surf trips to Baja,and some of it
will be off road,sand and such.So I want to put some
BFGoogrich T/A KO tires on,taller and wider.I was afrad
that the ratio would get out of wack
When I looked at the '94 van owner guide that came with
it,it shows that thir is a dana 3.73 L/S ,I looked just now
and it must be a E250 becase it is a 5,400 lb.
If money was not a problem I would buy a new Sportsmoble
4x4 but such is not the case,so does anybody have any
ideas. I drive van every day for work.
Thanks Carson
Elder User
Joined: Jan 2006
Posts: 629
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4.10s are only 15% more gear than your 3.55. Add 15% to your current RPM at a given speeed, and that will give you what your RPM will be with 4.10s.
If you get taller tires, the difference will be less, and you'll need the additional torque multiplication to maintain good acceleration at any rate.
I don't know what your internal tranny ratios are, but I'm guessing they aren't far off from my 97 Expy's E4OD. I run 4.10s with street-sized tires and I think it's perfect. These are very heavy vehicles and you need all the advantage you can get.
If you get taller tires, the difference will be less, and you'll need the additional torque multiplication to maintain good acceleration at any rate.
I don't know what your internal tranny ratios are, but I'm guessing they aren't far off from my 97 Expy's E4OD. I run 4.10s with street-sized tires and I think it's perfect. These are very heavy vehicles and you need all the advantage you can get.
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Post Fiend
Joined: Nov 2001
Posts: 14,947
Likes: 6
From: Topsfield, MA
There is an actual formula to calculate RPM in respect to gear ratio and tire size.
MPH x GEAR RATIO x 336 / TIRE SIZE * OVERDRIVE GEAR RATIO
That forumula would give you the RPM in overdrive.
MPH x GEAR RATIO x 336 / TIRE SIZE * OVERDRIVE GEAR RATIO
That forumula would give you the RPM in overdrive.
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Thread Starter
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New User
Joined: Feb 2006
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Thanks for the good advice.
I would like to try and find a diff to swap before redoing mine if I can.
After reading your posts I can see that a LS 4.10 or 4.11 w/ 31" tires is the only way to go.
If anyone can help me find out what Diff. will fit under my van would be great and if it had disc breaks it would be even better. CARSON
I would like to try and find a diff to swap before redoing mine if I can.
After reading your posts I can see that a LS 4.10 or 4.11 w/ 31" tires is the only way to go.
If anyone can help me find out what Diff. will fit under my van would be great and if it had disc breaks it would be even better. CARSON
Cargo Master
Joined: Dec 2003
Posts: 2,735
Likes: 38
From: Sunny Florida
The explorer rear axles are very common with 3L73 gears and even 4L10 gears. I have an 8.8 rear disk brake axle that has 3L73 gears in it. So they can be had and I am not sure what year ford started but some where along the line the explorers started getting 31 spline axles.
I know this may not be a good comparrison but i noticed a change in ratios in my 65 mustang when I went from 3L50 to 3L70. It was enough change that for a street driven car i would not go to 4.10 gears. The car is lighter than a truck so the truck may not feel the same as a light car would.
I know this may not be a good comparrison but i noticed a change in ratios in my 65 mustang when I went from 3L50 to 3L70. It was enough change that for a street driven car i would not go to 4.10 gears. The car is lighter than a truck so the truck may not feel the same as a light car would.
Cargo Master
Joined: Aug 2004
Posts: 2,899
Likes: 2
From: Lynnwood, WA
Originally Posted by RTM
The explorer rear axles are very common with 3L73 gears