Best Diff To Use?

[Guest nippykev]

Could someone please tell me which differential to use for quick acceleration?

Also which model it can be found in.

 

Ta Kevin

[Guest daveg]

Nippy

 

You need a high ratio...probably a 1600 would be best. However, if you have a 2L speedo drive/gearbox etc.....then you will have problems with speedo accuracy.

 

But it will over read so it should still pass sva.

 

Dave

[Bob Tucker]

Hi Kevin,

the diff you need for accelaration is the 3.92.

For some odd reason t was fitted to some 2.0 injection models.

BUT if you plan on long distance motorway trips it gets pretty wearing.

at 70 MPH with a 5 speed box its doing abut 3200 revs.

The 3.62 at 70 is doing aout 2700.

Check the VIN plate or the tag on one of the diff bolts to confirm the ratio.

Theres a series of codes which was on one of the sites (cant remember where)

Most other models of 1,8 & 2 litre had the 3.62 diff.

I dont know about the 1.6.

HTH Bob.

[Longboarder]

If a 3.92:1 diff is fitted to the donor it has D as the axle code on the Vin plate.

 

Nigel

[Guest Luke]

I've heard that theres an rare diff used which is 4.11:1 but i'm not sure what they came in (sorry, this was probally a useless post).

[Guest Bazwaz]

My 3.92:1 diff came from a 1.6 estate.

Barry.

[Guest trevor hooley]

the 4.11:1 diff was fitted to approx 1/3 of pre 1985 sierra estates...if thats any help

most of them have been gobbled up by the stock car fraternity as its preatty indestructable( and gets you away from the line like a rocket!!!)

 

karl

[Guest boggie]

3.9:1 Diff was fitted to all 2.0 injection and early 1.6 estate cars. Best diff is a 3.9:1 limited slip diff which was only fitted to the 2.0L DOHC XR4x4. I have one and not only do they give good accelleration but traction out of corners is fantastic.

Boggie

[Peter Bell]

The other problem with the low ratio diffs i.e. the 4.11 is that with the std. gearbox you are only doing about 22mph at 5000 rpm in first, I find that with a 3.77 ratio 1st gear is a bit too low and quite often just use 2nd to start off with a bit of clutch slipping.

Peter

[Guest Mike Perry]

I've spotted an XR4x4i on the bottom of a pile at my local scrappy.

How can I identify if it is LSD and which ratio.

 

ps are you guys suffering with building in this heat - cant wait to blast but most likely summer 2004.

[Guest boggie]

2.8 XR4x4 has 3.6:1 ratio,

2.0 XR4x4 has 3.9:1

[Guest Takumi]

The 4.11 diff will give best acceleration but, reduce your top speed capcity.

the 4.11 : 1 diff was fitted to the P100 pick-up Sierra, it used a solid axel and leaf springs,

 

So you would have to tack the diff apart to get the Crown Wheel and Pinion gear., these should just fit straight onto the normal sierra's differential ( the bit inside )

 

hope you get it sorted..

tak

[Guest klaxon]

My diff ID tag appears to read

3 39T

FOG 6B 24G

The letter on the VIN plate is "V". Sierra 1986 2.0GL

Is there such a thing as a 3.39:1....The "9" is very clear.

Any help on identifying would be appreciated

[Guest chris brown]

How can I identify if it is LSD and which ratio.

I think you will find that all the 4x4's had the 3.62 LSD fitted

[Guest FIRSTBUILD]

it must be easier to fit 13" wheels with low profile tyres ?