Rear Diff ratios S1 4.2

Alty Ian · Post by **Alty Ian** » Tue Apr 15, 2014 4:04 pm

Hi

Can anyone confirm which diff ratio our S1 car will have on chassis No, 1E10012.

I understood that all US S1 4.2's had 3.54 diffs but two catalogues I have seen suggest that some cars had 3.07 diffs. How can I tell which one it has without taking it apart. Ian

Durango2k · Post by **Durango2k** » Tue Apr 15, 2014 4:15 pm

There should be a Metal plate on the Upper right Edge, Attached to a Bolt, saying 46/13 or similar. Solving this gives the Ratio inside, Provided no one has altered it and left the plate !

Carsten

Post by **Heuer** » Tue Apr 15, 2014 4:50 pm

Alty Ian · Post by **Alty Ian** » Tue Apr 15, 2014 10:01 pm

So am I right in assuming a 3.07 diff would be 46/15 then ? Maths has always been my strong point,...ahem

Pim · Post by **Pim** » Wed Apr 16, 2014 7:00 am

43/14 from memory.

Durango2k · Post by **Durango2k** » Wed Apr 16, 2014 7:18 am

What numbers did you find ? Tell us so we can do the Maths for you :-)

Carsten

Alty Ian · Post by **Alty Ian** » Thu Apr 17, 2014 1:02 pm

I looked last night, 46/13 on the bottom of the diff, so it is a 3.54 after all so the parts catalogue I saw was wrong. I am seriously thinking of changing the crown wheel so I have a 3.07 diff for economy etc, can anyone recommend the best source for one as I have heard that some repros whine and are of poorer quality.

Cgarside · Post by **Cgarside** » Thu Apr 17, 2014 7:20 pm

I used Dana Techologies (OEM) for the LSD.
When I worked out the cost of new bearings, seals, crown wheel and pinion (I was changing from US to UK spec), I figured the all in price which Dana quoted was a good deal.

pmansson · Post by **pmansson** » Wed Apr 23, 2014 7:23 pm

This is the best of both worlds. Very good acceleration and low revs on the motorways. I have it in several Jaguars, incl E-types, XKs and the 50s and 60s saloons.

Alty Ian · Post by **Alty Ian** » Wed Apr 23, 2014 10:17 pm

Where would I find info on these dana diffs, cant seem to find it online?

christopher storey · Post by **christopher storey** » Thu Apr 24, 2014 7:14 am

Dana are in the USA. They do not manufacture differentials or complete final drives, but manufacture the gearsets which are used in them

64etype · Post by **64etype** » Thu Apr 24, 2014 3:44 pm

Alty Ian wrote:Where would I find info on these dana diffs, cant seem to find it online?

As already mentioned, Dana is a U.S. company. The 3.07 gearset was fairly common on early 80's four wheel drive International Scouts and Jeep Grand Cherokees, if either of those was imported to the UK. The front axle is the one to get as it typically has almost no wear. I purchase mine (from a Scout) for $15. The axle shop said it was like new. There are two issues with a U.S. spec gearset, however....one is that the mounting holes in the ring gear are larger diameter than for the original Jaguar application. I used small sleeves to take up the difference. Might be possible to find or make shoulder bolts. Some say don't bother as the clamping force is enough to keep the pinion gear in position even under high torque application. The second issue is the spline on the pinion is different. A company in Canada called IWE at www.rearendsonly.com sell the proper flange style coupling to fit the original Jaguar prop shaft. I believe Dick Maury at Coventry West in the U.S. also sells them. Also a standard U.S. spec bearing and seal kit has most of the correct part numbers, but a few are unique to the Salisbury pumpkin.

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Rear Diff ratios S1 4.2

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#9 Keep the 3.54 and get a 5-speed box

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