EE truetrac's and other diff's

garrett

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Jun 18, 2004
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no694terry said:
well whatevr diff i get, i gotta do something because if my 96 outback has to pull rover out of any more mud or climb one more hill that i would never even think of taking to truck up then i'm gonna have to start rethinking some things. i'm starting to like hill climbs. just wish rover could join the fun, subaru goes up them at 5k rpm with rooster tails out of all 4

Maybe you need to re-think how you drive. Start with being able to get the most out of your stock truck and go from there.

Rooster tails at 5K in a Subaru shows you haven't figured it out yet.
 

snorlax

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Oct 22, 2008
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Great technical posts. I learned a lot. The rear TT on my 95 D1, 5 spd made a huge difference. I purchased the TT in a reman diff and 4.11s from Bill at GBR. He spent a significant amount of time talking through the options so I feel like I made the right choice. One thing beyond price was that he walked me thorugh by phone to solve a mistake I made so I could complete the install.

Just my experience, and I am not going against any other opinion.
 

flyfisher11

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May 25, 2005
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R_Lefebvre said:
......
Anybody running TT's with stock D2 axles?

I did for a long time TT's front and rear on stock axles and cv's and wheeled it hard. Nary a problem. Still running stock front with the TT but changed to DT rear with Ashcroft axles. Also when I added the TT's I also added 4.10 gears reverse cut front.

edit: FWIW I've run from 32" to 34" tires including heavy bias ply swamper LTBs
 

mbrummal

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Jan 23, 2009
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p m said:
Mason, they _are_ torsen differentials.
Man, I wasn't thinking straight.

R_Lefebvre said:
I think what you're thinking of is a Torsen Type A ? It has cross-axis gearsets.
Yeah, that's what I was thinking about.


I didn't realize there were 2 types of torsen diferentials. I always thought that the type 'A' was a torsen and didn't think about what the TT was.
 

LuisC

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Jun 25, 2004
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Austin, Texas
BackInA88 said:
A locker is overkill but you are willing to spend twice the price for a couple wheel revolutions to engage?

That's why I'm opting for the TT not the Quaife. It's economics. $1000 for both front and rear or $1000 for just one. While the Quaife is better, it's not worth the extra $$$. I've been driving my D1 for 12 years now with open diffs and have yet to ever get seriously stuck that I could not get it out using a little resourcefulness. I just wanted a little extra piece of mind.
Oh, and I'm glad to see that the discussion is still going strong since I took most of the day off.
 
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p m

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LuisC said:
While the Quaife is better,
Care to explain, again? Provide any links? Throw any names?

FWIW, Luis, the fact that you haven't stuck anywhere in a D1 with open diffs in 12 years is significant. You know what does it mean, right?
 

LuisC

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Jun 25, 2004
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p m said:
Care to explain, again? Provide any links? Throw any names?

FWIW, Luis, the fact that you haven't stuck anywhere in a D1 with open diffs in 12 years is significant. You know what does it mean, right?

In my research, I had discussions with Dave at Ashcroft Transmissions.
www.ashcroft-transmissions.co.uk
That's for starters. Now I will have to dig for everything to share it and I just moved.
Something I did just learn from another LR forum, the Quaife has a life time warranty which I don't think Eaton offers.. Seems like this discussion has been going on in other forums.
I didn't realize that this would drive such passionate opinions.
 

p m

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Luis,

Compared to the heated debate about the exact measurements of 245/75R16 tires, you made a statement related to more serious matter. So, live with the questions.
This is the only mention of TracTech on Ashcroft's website:
The ATB supplied by Quaife and Tractech operate on the same principle but the Quaife has double the number of helical gears fitted"
.
It doesn't even mean Quaife diff is stronger than a TT (it may be, but one cannot say without knowing the details).
How does that translate into TrueTrac requiring twice more wheelspin to engage?
Given the TT's almost twice the amount of torque bias of the Quaife, it is even more intriguing. Provide quote or explain yourself, please.

Now, about lifetime warranty. It is one of the most blatant BS in commerce. Let's see... you buy a Quaife from Ashcroft for about $1k, it breaks ten years down the road, you take it out and wait for two months for the replacement to arrive in the mail?
Never mind, though. I've put about 110kmi on my rear TT, and about 35 - on the front. All - with stock LR axles. Something tells me that the only reason to replace a broken TT would be lack of oil in the housing (for an extended period of time).

Quaife diffs, in the U.S., are for poor suckers with rice rockets, for which Eaton doesn't care to make a locker or an LSD.

Where's Mark Olivares when you need him...
 

LuisC

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Jun 25, 2004
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Austin, Texas
Dave at Ashcroft made the statement in conversation and on another LR forum in just such a discussion they were having. I will have to look for that forum considering I read quite a lot of them.
Quaife is sold in the US so warranty replacement is not an issue.
As for the rice rockets. Coming from a drag racing background where I ran a 482cid BB Olds, running high 10s on street gas on a normally aspired engine, I have great respect for someone who can make such a small motor move a car that quickly.
 

p m

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I doubt that Dave said that TT would require more wheelspin to engage - he's very knowledgeable in all gear-related matters.

I didn't mean "rice rockets" as a derogatory term - just to indicate the large part of the U.S. market for Quaife.
 

pdxrovermech

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Jul 3, 2009
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Portland, OR
open difs here, maybe down the road I'll put an air locker in the rear. If you lock everything up then you lose the challenge and become just like every other jeeper.
 

R_Lefebvre

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Dec 10, 2007
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flyfisher11 said:
I did for a long time TT's front and rear on stock axles and cv's and wheeled it hard. Nary a problem. Still running stock front with the TT but changed to DT rear with Ashcroft axles. Also when I added the TT's I also added 4.10 gears reverse cut front.

edit: FWIW I've run from 32" to 34" tires including heavy bias ply swamper LTBs

Interesting. Maybe I could go that way then. I assumed I needed new axles in any case, at which point... what's another couple hundred bucks to go for a real locker? But, $900 for an LSD front and rear and not need axles... not a bad option.
 

R_Lefebvre

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Dec 10, 2007
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I didn't realize there were 2 types of torsen diferentials. I always thought that the type 'A' was a torsen and didn't think about what the TT was.

There's 3 now. Torsen "Type C". I don't know anything about it yet. They are talking about building 2 diffs in one. One unit that can serve as the center, and front diff, all-in-one for front engined AWD cars.

Now, about lifetime warranty. It is one of the most blatant BS in commerce. Let's see... you buy a Quaife from Ashcroft for about $1k, it breaks ten years down the road, you take it out and wait for two months for the replacement to arrive in the mail?

I guess it depends on how you use the vehicle. Quaife gets used a lot in motorsports, so having spares, or downtime on the car, might be an acceptable proposition. In any case, Quaife has a VERY strong reputation. I've never heard of one breaking. Yesterday, I did find one posting who had the bolts back out of his TT, destroying everything in the axle, and Eaton refused responsibility. There was suggestion it's happened before. I dunno.

Quaife diffs, in the U.S., are for poor suckers with rice rockets, for which Eaton doesn't care to make a locker or an LSD.

Yeah, back in 2001, Quaife USA wanted $1200 for the diff for my Focus, rediculous. Especially since you could get a Quaife for half that in the UK, but the UK vendors were prohibited from selling to NA due to QuaifeUSA's exclusive rights to the market. QuaifeUSA used some BS reasons why it was so much more expensive. Then Peloquin started offering another Torsen-type diff in the US for about $800, and QuaifeUSA immediately dropped their price to $600. Amazing how free markets work. $600 for a lifetime guaranteed LSD, that's not so bad, so that's what I did.