Board logo

What diff?
russbost - 16/8/18 at 01:02 PM

No, not the usual ratios Q!

Does anyone know if there is an independent diff, like the Sierra/Freelander/MX5 that will accept a pair of front wheel drive type driveshaft, ie those with CV joints to allow steering. I know little about of any of those diff's, but wondered, particularly with some of the Ford stuff if any shared a fitting/spline size with any of their FWD stuff?


40inches - 16/8/18 at 01:11 PM

The front diff from the 4WD Sierra?


russbost - 16/8/18 at 01:18 PM

Was that a separate diff or was it incorporated into the gearbox, I used to work on the things, but for the life of me can't remember

I had wondered about something from a 4 x 4 Panda, or Jiminy, but presumably a bit like rocking horse poo to find one nowadays!


cliftyhanger - 16/8/18 at 01:35 PM

You need to find spline dimensions....

My spitfire has a hybrid rear end. It uses rover 100 driveshafts, plugged into rover/mgf outer CV's (obvious) and currently Subary inner CV's, but when I used a Triumph diff I used some Volvo inner lobro joints. And I know some people have used a ford escort outer CV.... so there is loads of interchangability. The same must apply to other shafts/CVs. Where you get the info, I have no idea...
(I cannot claim to be the first to find this stuff, I just pinch other peoples ideas)


russbost - 16/8/18 at 01:40 PM

"I just pinch other peoples ideas" - precisely why I asked the Q - trying to find CORRECT info appears to be a needle in a haystack job ........


40inches - 16/8/18 at 01:46 PM

A separate diff, with a stub axle to use equal length driveshafts Info
More info Scroll down the page

[Edited on 16-8-18 by 40inches]


Ugg10 - 16/8/18 at 01:56 PM

https://www.ebay.co.uk/itm/Ford-sierra-front-diff-4x4/223100363536?hash=item33f1d16310:g:baQAAOSw--xbCaku

IIRC the sierra 4x4/cosworth 4x4 had a centre diff in the gearbox that cane out of the side with a prop shaft going forward with a separate front diff and the the "tradition" rear exit propshaft went to the rear diff, front one in link above. Also I think the Tiger ZR100 twin engine bike 4x4 used these with one engine running the front diff and one on the rear.

BMW x series looks like it has a similar set up -

https://www.ebay.co.uk/itm/BMW-X5-Series-E53-4-4i-M62-Front-Differential-Diff-3-64-Ratio-7508521-WARRANTY/272961476528?_trkparms=aid%3D555018%26algo%3 DPL.SIM%26ao%3D2%26asc%3D52945%26meid%3D17d3c358f3ef48518723351b1baa39f1%26pid%3D100005%26rk%3D4%26rkt%3D12%26mehot%3Dlo%26sd%3D223100363536%26itm%3D2 72961476528&_trksid=p2047675.c100005.m1851


Bluemoon - 16/8/18 at 02:10 PM

quote:
Originally posted by Ugg10
https://www.ebay.co.uk/itm/Ford-sierra-front-diff-4x4/223100363536?hash=item33f1d16310:g:baQAAOSw--xbCaku

IIRC the sierra 4x4/cosworth 4x4 had a centre diff in the gearbox that cane out of the side with a prop shaft going forward with a separate front diff and the the "tradition" rear exit propshaft went to the rear diff, front one in link above. Also I think the Tiger ZR100 twin engine bike 4x4 used these with one engine running the front diff and one on the rear.

BMW x series looks like it has a similar set up -

https://www.ebay.co.uk/itm/BMW-X5-Series-E53-4-4i-M62-Front-Differential-Diff-3-64-Ratio-7508521-WARRANTY/272961476528?_trkparms=aid%3D555018%26algo%3 DPL.SIM%26ao%3D2%26asc%3D52945%26meid%3D17d3c358f3ef48518723351b1baa39f1%26pid%3D100005%26rk%3D4%26rkt%3D12%26mehot%3Dlo%26sd%3D223100363536%26itm%3D2 72961476528&_trksid=p2047675.c100005.m1851


on the sierra 4x4 like this:



russbost - 16/8/18 at 03:58 PM

Hmm they are all going to be big, heavy & expensive, not what I'm looking for unfortunately


nick205 - 16/8/18 at 04:24 PM

russbost - are you wanting to come forward from rear mounted engine into a diff at the fron to drive the front wheels?

IIRC Ultima use a Porsche 911 transmission (G50?) at the rear of their GTR - turned upside down I think. That transmission isn't going to be cheap though! (If it is what they use) I think it may be a combined gearbox and diff as well.


HowardB - 16/8/18 at 04:25 PM

what about things like the Suzuki sj410 and 413,.. they are still common in the off roading scene,..

oops that is a solid front axle, not ideal.
So next shot would be a 4x4 quad.. honda bigred thing,...?

[Edited on 16/8/18 by HowardB]


nick205 - 17/8/18 at 08:48 AM

quote:
Originally posted by HowardB
what about things like the Suzuki sj410 and 413,.. they are still common in the off roading scene,..

oops that is a solid front axle, not ideal.
So next shot would be a 4x4 quad.. honda bigred thing,...?

[Edited on 16/8/18 by HowardB]



Thought about that type of thing, but not sure they'd take the power/torque of a car engine throught them. Probably not many around 2nd hand either.

Thinking further most 4x4 off road type vehicles are probably solid axle and most 4WD cars are probably front engine and have a combined transmission/front diff.


minitici - 17/8/18 at 09:12 AM

MX5 (up to 2005) rear differential drive shafts have the same spline as Ford Fiesta outer CV joints.
So you could use an MX5 differential and drive shafts with Ford Fiesta outer CV joints.


russbost - 17/8/18 at 09:33 AM

quote:
Originally posted by minitici
MX5 (up to 2005) rear differential drive shafts have the same spline as Ford Fiesta outer CV joints.
So you could use an MX5 differential and drive shafts with Ford Fiesta outer CV joints.


Great, thanks for that, exactly the sort of info I was looking for - is that change in 2005 the swap from Mk1 to Mk2?


minitici - 18/8/18 at 08:53 AM

quote:
Originally posted by russbost
quote:
Originally posted by minitici
MX5 (up to 2005) rear differential drive shafts have the same spline as Ford Fiesta outer CV joints.
So you could use an MX5 differential and drive shafts with Ford Fiesta outer CV joints.


Great, thanks for that, exactly the sort of info I was looking for - is that change in 2005 the swap from Mk1 to Mk2?


Hi Russ, I know that they fit the NA & NB MX5's up to 2005.
The later NC (Mk3) cars have larger diameter shafts.


russbost - 20/8/18 at 01:05 PM

Thanks for the info guys, I know next to nothing of MX5's, I assume Na & NB refer to Mk1 & Mk2?


theduck - 20/8/18 at 02:57 PM

Yep, NA is mk1 and NB is mk2


russbost - 20/8/18 at 04:00 PM

Just realised I've not asked the other obvious Q - which Fiesta's? age & engine size?


minitici - 21/8/18 at 11:14 AM

quote:
Originally posted by russbost
Just realised I've not asked the other obvious Q - which Fiesta's? age & engine size?


The CV joints with the 22 spline inner.
Typically Fiesta & Escort
https://www.ebay.co.uk/itm/SHAFTEC-Drive-Shaft-Joint-CV12N/163077254716

[Edited on 21/8/18 by minitici]


russbost - 21/8/18 at 12:13 PM

Great - thanks!