X300 owner's manual or old magazine road test reprints?

 

If "Output shaft revolution signal from speed sensor (revolution sensor)" is the sensor at the wheel, you could have it lie using an intermediate box. x ticks in = y ticks out.

where y=x*(new ratio/old ratio)

Of course, you have to keep telling the truth to the ABS system and the speedo, so it might have to be a tap feed. Or give up the speedo.

Also note that the whole deal seems to be aimed at detecting a slipping torque converter or transmission. Maybe start thinking along those logic lines.

And, consider looking at differences in file loads between a US market car and a Mexico market car because they carried different final drive ratios.

Any sign of a "Visco Lok" in the end of the carrier nearest the ring gear?

 

LOL !

Smart solution :-)

Could be done with a PIC controller at a few $ costs.

 

You can add 3.31:1 to that list - the manual X300R's have these fitted (rare)

If you go to JDHT and click on the x300 there's a list of diff options ;-) (it's basically the parts catalogue online.

 

So the VCM/IDS is a no go. No way to change anything in the transmission.

 

Here's some more pics of the HU14 diff for the curious minds. I compared the carriers to ford 8.8. for 9" and a GM 8.2 posi unit I had sitting on the shelf and nothing is similar enough to fit right.

 

OK, so I took out the EGS51 TCM and took it apart. Surprisingly the module is dated 23/11/05. The trans that came with the car looks way newer than '98 so now I'm really positive that it was updated at one point.

I had my buddy that was with me do a dump from the EEPROM and I'll post it here if any of you computer savvy geniuses wants to have a stab at it

So, so far no solution other than the expensive TCM programming.

However I talked to two guys who do tuning and flashing and apparently if we can get someone, with a module that already is tuned and has the gear ratio changed to what we want, to borrow it to me I can have the tune cloned to another module.

 

Even better would be two dumps with known gear ratios, one of which could be a dump with the stock ratio.

Then you take a look at what the differences are. From there you try to figure out what the tables might look like for all ratios.

 

That someone could be Jaxkr or Thundercat?......I'd be willing to make a cash contribution for the code clone.
Thundercat's got a 3.58 I think he mentioned on here...
Don't know what ratio Jax is running, he did mention going to 4.09:1 - saving that custom tcm flash before upping the 4.09 would be a safe and sensible thing to do? Backup.

 

. Apparently its not that easy. The TCM checks the checksum for the code. Every bit you manipulate will give you a different checksum, kinda like winzip when uou

 

I have gone as far as sending a TCM to Jeff@ Rentech in Florida to see if he could reprogram the TCM. He said the system is similar to an older version Mercedes used but they were unable to reprogram. The only way I have had it done is thru Eurotek Designs. He has had quite a few done, three for me alone. If someone is able to reprogram the shift strategy I am interested.

 

Hi Adam ,

thanks for the info and pics you shared so far !


Are there bearing numbers/brands visable ?

The bearings for the x300 diffs are sold all over the place , i never found
the ones for the HU14


Thanks !

 

Hi, is it possible please to help me with a picture of the output shaft bearing, to see the codes (JLM20337- it's original part number). I think that I need to change one, but Jaguar prices are just crazy.

 

You mean the pinion shaft?

 

I was looking at dana44 gearsets and carriers on eBay and the HU14 stuff is really close. I wish i had a set on hand so I could compare it.

 

I have another great question. If it goes into limp mode, will resetting it with an generic OBDII scanner will work to get it out of it? How many cycles, how long, before the P0730 gets registered?

 

my guess will be as soon as the car moves, it might flash the trac light depending on the ratio dropped in....who know's?! go on Adam, be a pioneer for us!

 

When I drove my car with the 3,27 diff the light came on as soon as the car shifted into second. With the 3,77 diff & the TCM for a 3.58 fitted I could drive the car as long as I never went into 4th gear. I know others have considered replacing the ABS rings as another way around. I will say if you change the diff ratio you will be amazed.

 

Hello! It is the shaft that is connected to the two drive shafts with 4 bolts(there is a right and a left one, it's called "output" on UK forums and Jag literature). It is a shaft with a bearing and a metallic "collar" with a diameter almost the same as the bearing.

 

Have you checked generic car parts stores? In US Autozone has it for $10. I'll see if i can find the bearimg part# next time i'm in the garage.