Mud-club

Vehicle & Technical => Range Rover => Topic started by: Merlin on December 11, 2004, 14:55:15

Title: Auto.box changing
Post by: Merlin on December 11, 2004, 14:55:15

My 3.9 seems to "hang-on" to3rd.too long.  It changes into top at 52. Is this the norm?, i think it would be better going into top at 46/7, save a goodly amount of juice that way.
Can you adjust them your-self to change at speeds you want?--Cogs

Title: Auto.box changing
Post by: Thrasher on December 11, 2004, 15:09:06

52 is the correct lock up point for that engine with your t/fer box and diffs ;-)

Title: Auto.box changing
Post by: muddyweb on December 11, 2004, 17:28:03

It's the Torque converter locking up.  The 3.5 boxes lock up at a lower speed, closer to 40mph.

There are ways to change them, but it's not a simple adjustment.

Title: Auto.box changing
Post by: Merlin on December 11, 2004, 19:01:19

Thanks, best to leave well alone I recon, just hoped to get a bit more mpg, still, much better than a S111 for comfort & lack of drafts.--Cogs

Title: Auto.box changing
Post by: SPIKEY on December 14, 2004, 23:12:32

My 3.5 ( F Reg ) Goes into 4th at exactly 30m.p.h.

My 3.9 ( G Reg ) stays in 1st for 5 miles because the governor is sticking :!:

Cheers,

SPIKEY.

Title: Auto.box changing
Post by: muddyweb on January 20, 2005, 13:04:31

Right then... after much digging around in the gearbox manual, and a few discussions with Dave @ Ashcroft.....

Changing the kickdown speed involves swapping a few little bits and pieces in the valve body of the box.  (A couple of springs, maybe a cam)

The good news is that the cost of parts is only around 15 quid... the bad news is that it's an absolute b***er of a job to do as it involves removing and stripping the valve body..  (This is not for the faint hearted)

The other alternative you have is to swap the whole valve body for one from a different box, or an exchange one from Ashcroft.  Dave does the exchange control unit for 150 quid.

Hope that helps.

Title: Auto.box changing
Post by: gnasha on January 20, 2005, 14:27:28

never noticed on mine as i hardly tell it changes smothest auto i have had

Title: Auto.box changing
Post by: Merlin on January 20, 2005, 20:25:58

How does the "valve body" come out?, is it a" box out" job or an accessable from" in situe" part?

Title: Auto.box changing
Post by: muddyweb on January 20, 2005, 20:35:10

You need to take the box sump off (with all the cafuffle that entails) then it's just a case of undoing about 8 Torx bolts.

Then the fun begins......