Differential ratios

TurboZed · Jul 3rd, 2010, 23:29

Hi,
I've tried the search facility but didn't find what I was looking for... Is there a list anywhere of what diiferential ratios were fitted to what models of 7 and 9 series cars for the UK market? I have a 1991 940 TD estate with the D24T engine but it is very low geared and I would like to fit a higher final drive back axle. (it has the overdrive M46 gear box)
Cheers
Jim

gpl1968 · Jul 4th, 2010, 15:07

There should be a label on the back of the left hand axle shaft near the hub. It will probably be covered with underseal and dirt but can be cleaned carefully with white spirit.
The label will indicate the axle type (1030/1031/1041) and the final drive ratio (3.31:1 / 3.54:1 / 3.73:1 / 3.91:1 / 4.10:1).

TurboZed · Jul 4th, 2010, 23:21

Thanks for that, but is there a list anywhere of which models had what fitted?

RealEstate · Jul 5th, 2010, 14:22

My '91 230FB (no turbo) with ZF autobox has 3.91 final drive.

Can other folk post up their ratios, so we can build up a table?

Steve940estate · Jul 5th, 2010, 14:52

Some of the owners handbooks list diff ratios but don't say what cars they were fitted too. It's probably best to look. My car has the actual ratio on the label.

TurboZed · Jul 5th, 2010, 17:50

I do believe that early 760 diesel autos that had a borg warner gearbox had a ration of 3.15 : 1. I could do with one of those! I'll have a look at mine and post on here what it is.

Steve940estate · Jul 5th, 2010, 20:30

I've got a 1992 owners manual for a 940 and it lists a 3.31:1, doesn't say what that was fitted to though. You would think that with the torque of the diesel thats the one that is fitted.
It wuld be interesting to hear what your car has though. My FT manual turbo has a 3.91:1 diff at the moment (car used to be an auto) and it revs a bit high really. It should have a 3.54:1.

gpl1968 · Jul 5th, 2010, 21:35

My 2.3 lpt (B230FK) has 3.54:1 diff.
I think the hpt had the 3.73:1 diff.

chorleybo · Jul 5th, 2010, 22:54

would the vin number tell what diff is fitted ?

gpl1968 · Jul 5th, 2010, 22:57

No, the label on the axle tube is the best way.

Jul 3rd, 2010, 23:29	#1
TurboZed Junior Member Last Online: Mar 22nd, 2024 13:44 Join Date: Jul 2010 Location: Stafford	Differential ratios Hi, I've tried the search facility but didn't find what I was looking for... Is there a list anywhere of what diiferential ratios were fitted to what models of 7 and 9 series cars for the UK market? I have a 1991 940 TD estate with the D24T engine but it is very low geared and I would like to fit a higher final drive back axle. (it has the overdrive M46 gear box) Cheers Jim

Jul 4th, 2010, 15:07	#2
gpl1968 VOC Member Last Online: Apr 14th, 2024 16:45 Join Date: Jun 2007 Location: Wirral View Photos By: gpl1968	There should be a label on the back of the left hand axle shaft near the hub. It will probably be covered with underseal and dirt but can be cleaned carefully with white spirit. The label will indicate the axle type (1030/1031/1041) and the final drive ratio (3.31:1 / 3.54:1 / 3.73:1 / 3.91:1 / 4.10:1). __________________ Gavin 1997 945 CD (B230FK) [RIP: 1991 945 Turbo (B230FT) 1992 945 SE turbo (B200FT)]

Jul 5th, 2010, 14:22	#4
RealEstate Master Member Last Online: Nov 4th, 2018 16:06 Join Date: Dec 2003 Location: Berkshire & N Wales View Photos By: RealEstate	My '91 230FB (no turbo) with ZF autobox has 3.91 final drive. Can other folk post up their ratios, so we can build up a table? Last edited by RealEstate; Jul 5th, 2010 at 15:13.

Jul 5th, 2010, 21:35	#8
gpl1968 VOC Member Last Online: Apr 14th, 2024 16:45 Join Date: Jun 2007 Location: Wirral View Photos By: gpl1968	My 2.3 lpt (B230FK) has 3.54:1 diff. I think the hpt had the 3.73:1 diff. __________________ Gavin 1997 945 CD (B230FK) [RIP: 1991 945 Turbo (B230FT) 1992 945 SE turbo (B200FT)]

Jul 5th, 2010, 22:57	#10
gpl1968 VOC Member Last Online: Apr 14th, 2024 16:45 Join Date: Jun 2007 Location: Wirral View Photos By: gpl1968	No, the label on the axle tube is the best way. __________________ Gavin 1997 945 CD (B230FK) [RIP: 1991 945 Turbo (B230FT) 1992 945 SE turbo (B200FT)]

Jul 4th, 2010, 23:21	#3
TurboZed Junior Member Last Online: Mar 22nd, 2024 13:44 Join Date: Jul 2010 Location: Stafford	Thanks for that, but is there a list anywhere of which models had what fitted?

Jul 5th, 2010, 14:52	#5
Steve940estate Steam Driven PC Owner. Last Online: Mar 4th, 2024 23:50 Join Date: Dec 2004 Location: Not sure.	Some of the owners handbooks list diff ratios but don't say what cars they were fitted too. It's probably best to look. My car has the actual ratio on the label.

Jul 5th, 2010, 17:50	#6
TurboZed Junior Member Last Online: Mar 22nd, 2024 13:44 Join Date: Jul 2010 Location: Stafford	I do believe that early 760 diesel autos that had a borg warner gearbox had a ration of 3.15 : 1. I could do with one of those! I'll have a look at mine and post on here what it is.

Jul 5th, 2010, 20:30	#7
Steve940estate Steam Driven PC Owner. Last Online: Mar 4th, 2024 23:50 Join Date: Dec 2004 Location: Not sure.	I've got a 1992 owners manual for a 940 and it lists a 3.31:1, doesn't say what that was fitted to though. You would think that with the torque of the diesel thats the one that is fitted. It wuld be interesting to hear what your car has though. My FT manual turbo has a 3.91:1 diff at the moment (car used to be an auto) and it revs a bit high really. It should have a 3.54:1.

Jul 5th, 2010, 22:54	#9
chorleybo Junior Member Last Online: Apr 6th, 2011 16:59 Join Date: Sep 2007 Location: ipswich	would the vin number tell what diff is fitted ?

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