I need an advice. My Sierra is 2.0 SOHC engine, 3 door and I want to buy a LSD for her but which is better? I've found 3.62 viscous from Escort and 3.92 from 4x4 Sierra estate. It is a wannabe drift car, so the final result needs to be more slidden.

 

you need quick acceleration i reckon in a drifter so which ever one gives the lowest top speed...im shit with gears cant remebr which one gives the top speed.

 

The higher the number the lower the gearing, with all else being the same, so would be 3.92:1 will give the quicker acceleration but lower top speed, opposite for the 3.62:1 with slower accelration but higher top speed(potential).
Surely for drift it would be better to use a welded diff ?
3.92:1 fitted only on 1600ohc(carb) estate, with 4 and 5 speed boxes, 2L EFI hatch/saph/estate with 5 speed box, autos are mix of 3.62:1 and 3.38:1, all 4wd were 3.62:1, but could be specced with lower ratio towing pack(cost option).
These will not be lsd unless 4wd ones, or cossie.
tabetha

 

Welded diff is the last option. It comes with lots of problems (broken propeller shaft etc). And the car is going to be driven on public roads, not only on track so welded diff is not the best solution.
The ratio problem is almost clear for me.
The question is which one blocks better and which is more suitable for the job?
Edit: The 3.92 diff is from 4x4 estate with DOHC engine

 

A welded diff is fine for everyday use. I've got one in my daily driver. Do about 200 miles a week to work and back, no problems.

 

As above I know a few using welded diffs, they say it is only a problem in the rain with wanting to go straight on when going fast, but never used one myself.
I took the info from the ford handbook re diff ratio's, maybe they were different in other countries.
tabetha

 

On 4x4 models, 3.62 ones were Cosworth and V6. ALL DOHC 4x4 models were 3.92 as standard.

 

Both LSDs I've found in announcements so I don't know how reliably they are. When I deside which to buy I will check them.
I've found this

3,97 6146561 85GG 4006 DC 1,6/1,8 CVH 2,0 DOHC

3,62 6146560 85GG 4006 BC 1,6/1,8 CVH 2,0 DOHC 4x4

3,38 1630004 85GG 4006 AC 1,8 CVH 2,0 OHC 2,3 Diesel

3,36 6124451 85GG 4006 FB 2,9

3,14 6152100 87BG 4006 GB 2,0 OHC / DOHC 2,3 Diesel

LSD

3,92 6171465 86GG 4006 AAA 1,6/1,8 CVH 2,0 DOHC

3,62 1648393 V87BB 4006 BAA 1,6/1,8 CVH 2,0 DOHC 4x4

3,38 1648394 V87BG 4006 CAA 1,8 CVH 2,0 OHC 2,3 Diesel

3,36 6142222 85GG 4006 AAA 2,9

According to which 3.92 LSD is not in 4x4, may be you are right.
The 3.62 from Escort Cosworth is compatible with the Sierra bits, right? The rear axle is the same I think.

 

Trust me, in the UK, 2.0 DOHC 4x4 models have a 3.92 7" rear diff with LSD. I have one and I know of many more.

 

Right.
So is this LSD reliable for the job?

 

No.

IF you want to go round in circles "drifting", get a normal "open" 3.92 7.5" diff and get handy with a welder and spanners.

 

For drifting a welded diff is what you want, unless you can afford a good 2-way diff.

Most standard LSD's don't lock for shit even when they are brand new and they jsut get worse as they get older.

 

Thanks for the answer

 

Hi,
I've databased all the Ford Diff Ratios I can find. Most of the info came directly from Ford and Microfiche at the local dealership. So, it should be good.

I tried pasting it here, but tables aren't supported

There are even more (Later models, Granada and Escort cosworth etc) at
http://www.super7thheaven.co.uk/Sier...r_Differential

I've put all the service manuals on there too.

Hope that helps

 

Nice link thanks for that

 

so if you have a front diff 3:92 does the rear diff have to be 3:92 to match?

 

I can confirm it. Thats is.

 

According to the Ford dealership and my research I recon the 3.92 4x4 diff is an internet myth.
The Ford microfiche only lists a 3.62:1

http://www.super7thheaven.co.uk/Sier...r_Differential

 

Are you just trying to start an argument?

I have a 4x4 with a 3.92 set of diffs, a spare set in the garage and another car with them on about 5 houses away from me. I know of @ least 7 other cars with them on, including a couple of other members from on here. They are all checked and confirmed as 3.92 ratio as well by physical rotational checks.

If you go to www.forum.fordsierraclub.co.uk, I am sure they will put you right as well.

You are probaly being confused by DOHC, V6 and Cosworth 4x4s, as the DOHC is different to the other.

 

You might be just the man!!!
Help!
I've got 3 front Diffs. 2 of which were described as 2.0 DOHC 4x4 diff in the adverts, but when they arrived they were all 3.62:1 - hence my confusion etc.

After buying 3, I decided to visit the local Ford dealership only to be told; by an Escort Cosworth owner; that they never made a 3.92:1. I even sat reading and printing their microfiche for most of the day (with no sign of the mythical 3.92).

SO..... HELP!!! PLEASE!!! Does you're diff have a part numbers or any external distinguishing features??

Any idea on number of teeth etc??

If it does could I be real cheeky and ask you to post it or email me anything you've got?
mark@vantagecms.com

I'll post anything good on http://www.super7thheaven.co.uk/

 

Ask your Cosworth-owning Ford bloke what finis 1661121 is. When he tells you that it is the front diff for a DOHC 2.0, then get him to explain his previous comment that they did not make them. The finis for the crownwheel and pinion for the front diff is 1661122. If you want basic part numbers, I can provide them as well.

As for the rest of what you said, if I get the chance to dig into the deep depths of the garage behind all the motorbike bits, I will certainly get the tags details off the diffs for you.