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Fitting 4.11 Gears into 3.08 Diff 

 

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 Post subject: Fitting 4.11 Gears into 3.08 Diff
Posted: Mon Sep 08, 2008 11:06 pm 
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Can this be done? What happens with the LSD part, if I install them will it still be a single spiner unless I get the LSD part?

Will they fit into a diff with 3.08 gears that the moment?

Is it hard to do?


Thanks guys!

 

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Posted: Mon Sep 08, 2008 11:36 pm 
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Yeah I have searched just if someone could answer these Qs for me quickly I would be most gratful...

 

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Posted: Mon Sep 08, 2008 11:36 pm 
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Are you running an lsd atm or just a lonely little single spinner?

 

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Posted: Mon Sep 08, 2008 11:57 pm 
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lol just the single spinner, but the fella has the LSD part for sale as well...

Trying to decide between 3.89s and 4.11s...

 

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Posted: Tue Sep 09, 2008 12:14 am 
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If I had to choose between a genuine LSD or a Mini Spool what would be the go? Bear in mind the Mini Spool is half the price...

 

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Posted: Tue Sep 09, 2008 12:18 am 
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mate go the 4.11 much fun too be had i love em but go lsd also better traction then single spinner

 

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Posted: Tue Sep 09, 2008 12:20 am 
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Personally i went for the genuine lsd, mainly on the recommendation of the guys that did the diff for me. is this something your looking at doing urself or taking it to a specialist?

 

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Posted: Tue Sep 09, 2008 12:24 am 
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My Dad's pretty decent with cars and I have a mate that was a mechanic but lost his job due to a fight at work - I'm hoping I can do it myself with their help. Reckon we'll be able to get it done? Is there anythign else I'll need if we do do it ourselves?

I just read that spools are terrible for your driveline if you drive them on the road constantly... does that sound true?

What about the 4.11s on the highway, I make trips to brissy and whatnot say once every 3 months? What kind of rpm:speed you reckon I'll be getting?

 

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Posted: Tue Sep 09, 2008 12:32 am 
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IMO i would go the 4.11 lsd, from experience i went from 1800 rpm 3.23 - 2100/2200 with 3.73, so ur prob looking at roughly 2500 at 100. if ur only doing highway trips every 3 months the money you save around town with less revs required will even out what it costs on the highway.

 

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Posted: Tue Sep 09, 2008 12:37 am 
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Also there is a calc in the tech docs that tells you what ur speed will be. here is the link.

http://www.fordmods.com/forums/Speedo-Calc-d30.html

 

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Posted: Tue Sep 09, 2008 12:50 am 
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Thanks guys! 'preicate all yas help!

Still iffy on what to go with but I'm gonna check around the wreckers tomorrow and see what they can do, seeing as I need to stuff around with different bits and pieces cause my car's an auto I think I'll convert it to a manual first.


Nite guys!

 

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Posted: Tue Sep 09, 2008 3:51 pm 
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It should be noted that the 3.45 gears and carrier will not fit into a 3.08 housing.

Also, changing centres is not what I would call a DIY operation for a backyard mechanic. There are specialist tools and knowledge required and is best left to the experts.

BenJ

 

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Posted: Tue Sep 09, 2008 3:59 pm 
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do you know what other gears will fit into the 3.08 housing?

 

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Posted: Tue Sep 09, 2008 4:03 pm 
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3.08, 2.99, 2.73

It is a much easier and cheaper proposition to source a complete diif including housing, and swap that into your car.

That really is a DIY job and I have done it a couple of times. Using a trolley jack, ramps and stands, I can swap the diff on my own in under two hours.

BenJ

 

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Last edited by BenJ on Tue Sep 09, 2008 5:15 pm, edited 1 time in total.

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Posted: Tue Sep 09, 2008 4:41 pm 
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oh what spewing, so nothing short can go in my diff aswell

 

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