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Author Topic: diff change  (Read 874 times)

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Bojan

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diff change
« on: 30 July 2010, 19:40:07 »
I have a 96 3.0 MV6 manual. It has standard 3.70:1 diff.
It is in my opinion that this gear setup is too long.
It is very good for autobahn, but I dont use it very often, and even if I do, i drive up to 150...160 kmph.
Therefore, this 240+ kmph gearratio setup is useless for me.

On the other hand, in urban driving, the car is not qiuck engouh for it's power.

So, i'm thinking of replacing my 3.70:1 diff with a shorter one (3.90:1 of an automatic 3.0 v6, or 4.22:1 of an automatic 2.5 V6).

Has anybody done this? what are the impressions?
Also, will the 2.5 V6 (or 2.0 16v) diff break if mounted to 3.0 v6?

PS. I had an automatic 2.5 V6 estate (4.22:1 diff), whose gearbox brokedown, so we replaced it with an manual one, but left the auto diff...the car had great accelerations, especially in low speeds.
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gsizoli

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Re: diff change
« Reply #1 on: 30 July 2010, 20:04:39 »
I hava a 2000MY 3.0 manual with 3.9 ratio diff. I' cant feel too much difference, Previous this car I owned a 3.0 manual with 3.7 diff. Perhaps the acceleration is faster a little bit now but not with  seconds.. :P The fuel consumption is the same like wilt 3.7.The rev is a little bit higher at any speed, but I can use the 5th at 50km/h without any problem. I don't use the car on highways so I can't give you information about the top speed, I used at 140KM/h but I don't remember how much was the rev at that speed. But I will check it for you, as I will refit the transmission tomorrow.
« Last Edit: 30 July 2010, 20:05:22 by gsizoli »
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Marks DTM Calib

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Re: diff change
« Reply #2 on: 30 July 2010, 21:42:56 »
A diff from a 2.5 will be more than strong enough
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Matchless

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Re: diff change
« Reply #3 on: 30 July 2010, 22:49:36 »
If you want good acceleration go for the 4.22 from the 2.5 auto, it is plenty strong enough for the torque of a 3.0.
Only problem is the fuel consumption, the increased acceleration is addictive and the fuel tank empties at an equally fast rate.
I swapped the 4.22 for a 3.7 to get better economy but it is too tall, a 3.9 would have been a better compromise.
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Bojan

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Re: diff change
« Reply #4 on: 01 August 2010, 21:19:42 »
oh, good! thanks for replies and usefull information guys.
than it is basically just the case of selecting the best gear ratio. nice...

how much time is needed to replace the diff?
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serek

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Re: diff change
« Reply #5 on: 01 August 2010, 22:38:14 »
Quote
oh, good! thanks for replies and usefull information guys.
than it is basically just the case of selecting the best gear ratio. nice...

how much time is needed to replace the diff?
if you got someone who give you hand, easy to replace under 1H :y
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