Diff overhaul

[GreenV8S]

I have an umbrella that more or less covers the opening with the rear section up. Many's the time I've sat in the paddock with the brolly keeping me dry while I wait to go on track.

[TVRees]

SteveOS3 said:

Mark the propshaft and diff flanges with a centre-punch to make sure we can refit in the same position. Is this necessary?

phillpot said:

Certainly good practice for the prop-shaft, maybe not so necessary for the drive shafts, imho.

I think I read somewhere that it is important not to change the direction of rotation of the drive shafts. So, it is always a good idea to mark them to put them back in the same position.

Be careful with the springy spacer, it's critical to the function of the handbrake. I almost broke mine trying to get the cable out.

Glad to hear that all went well and a 'big like' for the patriotic flag - I'll have to get one for my garage too

[GreenV8S]

TVRees said:

I think I read somewhere that it is important not to change the direction of rotation of the drive shafts.

Are you thinking about the shafts themselves (the metal bars) or the whole assembly including the CV joints? I suppose there may be some effect from reversing the CVs so that the normal direction of load is bearing on an unworn surface - no idea whether that would be a benefit or a disadvantage. I can't imagine the metal bars will care which way round they are fitted. I generally keep them the same way round but that hasn't stopped me breaking several of them.

[TVRees]

Two things:

If the complete shaft plus CV joint are just taken off and not disassembled, then it is a good idea to put them back in the same position, so the direction of rotation is not changed.

If the CV joint is being replaced, then during the disassembly it mentions the following in 'the Bible'

"Mark the joint housing and shaft so they can be reassembled in the same position"

[glenrobbo]

TVRees said:

..... a 'big like' for the patriotic flag - I'll have to get one for my garage too

I wonder if that will be the background component of the new TVR ( or perhaps it will be TFR? ) badge?
And will the Red Rose editions be superceded by Yellow Daffodil upgrades?
We certainly don't want the Big Leek version!

Sorry.

[SteveOS3]

Now that everything is out I need to order a diff overhaul kit but don't know if it's 7" or 7.5"

The bolts are proving very tricky at the moment but I'd like to order asap to try and get ready for drive it day on 14th.

The numbers on the diff tag are: 85 GG HB 364 BA 0D25
and on the diff casing: 85 GG 4033 BA

Fordopedia.org has the diff casing as from a Sierra Mk1 1982-86

Does this help me to identify which size it is?

[magpies]

I believe they are all 7.5"

the difference can be seen on the top front mounting is solid across the full width on the 7.5"

[magpies]

here's a photo - just took a while to find

[SteveOS3]

Brilliant!!

I thought it may have been something internal like the crown wheel etc..

Steve

[DamianS3]

As standard all 7.5"... Don't forget to drop an LSD in there while you are at it. One of the best mods you can do to the s IMHO

Damian S3

[magpies]

DamianS3 said:

As standard all 7.5"... Don't forget to drop an LSD in there while you are at it. One of the best mods you can do to the s IMHO

Damian S3

agreed

[SteveOS3]

Not sure I can stretch that far, but there is 2.9 Scorpio going for scrap about a mile from me. Would the ratios/fittings be different/ a problem? Would it affect speed readings etc?

[magpies]

the Scorpio will have the standard diff - the Granada 24v has the lsd along with some of the Sierras

[magpies]

Ford Sierra Differential Ratios
RATIO VEHICLE SHAFT DIFF TEETH FINIS PART NO.
3.14 Sierra[TL16](−Mar83)(D),
Sierra[TL16](−Apr83)(UK),
Sierra[TV23,PD23],
Sierra[TV28INJ−AUTO],
Sierra[TL20H](non−ABS),
Sierra[DL20H](non−ABS),
Sierra[PD23](−Jan90)(non−ABS) Tripod Non−LSD 6107624 83BG 4006 KC
3.14 Sierra[TV28INJ](−Jan90) Lobro Non−LSD 1644899 85GG 4006 GB
3.14 Sierra[DL20](ABS),
Sierra[PD23](ABS)(−Jan90),
Granada[DL20](Feb92−) Lobro Non−LSD 6152100 87BG 4006 BA
3.14 Granada[DL20](Feb92−) Lobro LSD 6193181 88GG 4006 AEA
3.14 Sierra[TL16,TV23,PD23] Tripod LSD 1619200 V83BG 4006 AA
3.14 Sierra Lobro LSD 1648395 V87BG 4006 DAA
3.36 Sierra[TV28INJ](5Spd−Type9) Tripod Non−LSD 6131195 83BG 4006 BA
3.36 Sierra[TV29](Jan90−May91) Lobro LSD 6142222 85GG 4006 AAA
8500 4006 AAA
3.36 Sierra[LL23INJ](XR4)(USA/CDN),
Sierra[TV28](−Jan90),
Sierra[TV29](−May91) Lobro Non−LSD 6124451
3.36 Sierra[TV29](2WD)(May90−),
Granada[TV29](2WD)(Feb92−),
Granada[PD25T](Feb92−) Lobro LSD 6663905 91GG 4006 AAA
3.36 Sierra[TV29](May90−),
Granada[TV29](2WD)(Feb92−),
Granada[PD25T](Feb92−) Lobro Non−LSD 6663908 91GG 4006 FA
3.36 Granada[CP29] Lobro LSD 6831237 93GG 4006 AAA
3.36 Granada[VM25](Aug93−),
Scorpio[VM25](Oct94−Jan96) Lobro Non−LSD 6803399 94GG 4006 AA
3.36 Scorpio[VM25](Jan96−) Lobro LSD 1026116 96GG 4006 BDA
3.36 Scorpio[VM25](Jan96−Sep96) Lobro Non-LSD 1015630 96GG 4006 FA
3.36 Scorpio[VM25](Sep96−) Lobro Non-LSD 1035424 97GG 4006 AA
3.38 Sierra[HL18](Jan91−),
Sierra[D18T](Jan90−),
Sierra[TL16,TL18,TL20,TL20H,TV20,TV23,PD23] Tripod Non−LSD 6107625 83BG 4006 LC
3.38 Sierra[TL18,TL20,PD23]
Sierra[HL18](Aug89−), Lobro Non−LSD 1630004 85GG 4006 AC,
8500 4006 AC
3.38 Sierra[TL16,TL20,TV] Tripod LSD? 1619201 V83BG 4006 BA
3.38 Sierra Lobro LSD 1648394 V87BG 4006 CAA
3.62 Sierra[TL16,TL18](Jun85−), Tripod Non−LSD 6107623 83BG 4006 CC
3.62 Sierra[TL16,TL18](Jun85−), Tripod Non−LSD 23 6157715 83BG 4006 CD
3.62 Sierra[TL18](Man)(Jun85−), Tripod Non−LSD 26 6157715 83BG 4006 CD
3.62 Sierra[TL20H,TV,TL18,HL18],
Sierra[TL20INJ](GL,GHIA,2.0iS],
Sierra[TL20,DL20](−Jan90),
Sierra[TL20,DL20,D18T](Jan90−) Tripod Non−LSD 6107626 83BG 4006 MC
3.62 Sierra[TL16,TL18](Jun85−),
Sierra[TL16] Tripod Non−LSD 26 6107626 83BG 4006 MC
3.62 Sierra[TL18](Man) Tripod Non−LSD 28 6107626 83BG 4006 MC
3.62 Sierra[TV28INJ](XR4) Tripod Non−LSD 6124295 83BG 4006 RC
3.62 Sierra[TL16,TL18,TL20,DL20] Lobro Non−LSD 6146560 85GG 4006 BC,
8500 4006 BC
3.62 Sierra(TV28INJ) Tripod LSD 1619202 V83BG 4006 CA
3.62 Sierra[TV28INJ,DL20,TV29],
Sierra[CH20](Feb90−),
Granada[CP29](4wd)(Feb92−) Lobro LSD 1627946 V85BB 4006 AA
3.62 Sierra[DL20](Jan90−),
Sierra[D18T] Lobro LSD 1648393 V87BG 4006 BAA
3.64 Granada(85−92) Lobro LSD 85GG 4006 ACA
3.64 Sierra[LL23INJ](XR4)(USA,CDN) Lobro Non−LSD 6137510 85GG 4006 HB
3.64 Sierra(Cosworth) Lobro LSD 86BB 4006 AAA
3.64 Granada(2WD)(Feb92−) Lobro LSD 6663907 91GG 4006 ACA
3.64 Scorpio(Cosworth) Lobro LSD 91GG 4006 ADA
3.64 Scorpio Lobro LSD 95GG 4006 ACA
3.64 Granada(2WD)(Feb92−) Lobro Non−LSD 6663910 91GG 4006 HA
3.64 Scorpio[CP29](Oct94−Jan96),
Scorpio[TV29](Oct94−Jan96) Lobro Non−LSD 7035888 95GG 4006 JA
3.64 Scorpio[TV29](Jan96−Aug96) Lobro LSD 1026114 96GG 4006 BCA
3.64 Scorpio[CP29](Jan96−),
Scorpio[TV29](Jan96−Aug96) Lobro Non−LSD