Rear Diff Identification

rossord · Post by **rossord** » Tue Sep 16, 2014 8:06 pm

I have acquired a used 3.07 rear diff to replace the current 3.54 unit in my US 1970 series 2 e type. There are no tags on the replacement unit, though I know it is a 3.07 from the stamping on the crownwheel - 4HA 016 25 43X14 STL J68 WRG. On the cover mounting flange appears the lettering F69 408 0. So that I may order the correct service parts - particularly bearings - can anyone identify when this diff was manufactured and/or which model it would have been originally fitted to? Thanks. Ross.

288gto · Post by **288gto** » Tue Sep 16, 2014 10:45 pm

Ross,
I had just such a dilema and ended up with three 3.07 diffs.
The original jaguar parts catalogue has a small section on identifying the three different types of powerloc diffs. While they are interchangeable as a complete unit, not all the internals are interchangeable. If it is a post 69 diff it will almost certainly be a type 3 diff. Assuming it has a pressed steel rear cover, it shouldn't have metric bearings.
Not sure about the rules about posting chunks of Jaguar publications but you could always pm me for more identification help and the relevant part numbers.
The one thing I cant do is date your diff exactly from the numbers quoted although someone else might.

Simon

rossord · Post by **rossord** » Wed Sep 17, 2014 10:37 am

Hi Simon, and thanks. It was the page in the spare parts catalogue that first alerted me to the existence of variations! The replacement diff is not lsd, just a normal one, which I think would suggest an early type. If you could try posting an image of plate 27 of publication j38 that would be great. I guess that we will have to compare the replacement with the one on the car to see the differences, and try to source the correct bits thereafter. Cheers. Ross.

jagman1970 · Post by **jagman1970** » Wed Sep 17, 2014 11:31 am

Ross

My 1970 E-Type does not have a LSD so it could be later. I believe for the series 2 it was optional.

Regards

Keith

iani · Post by **iani** » Wed Sep 17, 2014 11:54 am

If you look here: http://www.xkengineering.com/parts/parts-catalogue.php and download the vehicle identification pdf, it shows what diff ratios were available for different models.

Ian

rossord · Post by **rossord** » Thu Sep 18, 2014 7:51 pm

Thanks guys for your help. Looks as though the diff could be from a range of years. Removal and comparison with existing will tell the tale. Cheers.

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Rear Diff Identification

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