What transmission do I have? 3.0D

[SMOKEY53]

Hi guys

Just trying to establish what transmission is in my car

It's a 2005 3.0D

Real OEM based on my VIN says I should have a GA6HP26Z - RealOEM.com * Diagram Selection

I have been under the car and the transmission is stamped with (GA)6HP26X (Can provide pic)

I can't find any info on a GA6HP26X so I'm just wondering what the 'X' is all about.

I can tell that this transmission has come off at some stage as there are score mark on the bolts - so want to make sure that the right transmission is living there, not some lesser replacement.

Reason being, I'm trying to establish the max torque rating of the transmission as I plan to chip it.

This extract from the manual says a GA6HP26Z is designed to take 600nm - which is bang on what the chip says it will deliver.

BMW Workshop Manuals > X Series E53 X5 4.8is (N62-S) OFFRD > 6 SI Techniques > 24 Automatic Transmission (AUT) > 2 SBT 6-speed Automatic Transmission E53, E60, E61, E63, E64, E65, E66, E70, E81, E83, > Page 3512

[SMOKEY53]

Have found this on the ZF site confirming that the 6HP26X will take 444 ft lbs or 600nM.

http://www.zf.com/media/media/docume...8X_Catalog.pdf

Looks like I answered my own question. Will leave it here for future reference as literally nothing came up on google.....only things in Russian and references to certain Land Rovers.

[RRPhil]

The ‘X’ means the casing is designed to mate with a transfer box. I mention this here : http://www.xoutpost.com/bmw-sav-foru...-teardown.html

Though it varies depending on the torque converter used, the generation 1 transmissions had (maximum input) torque capacities of :

6HP19 = 400Nm
6HP26 = 600Nm
6HP32 = 750Nm

(The early ‘basic’ 6HP26 came fitted with the W260 S converter with an input torque capacity of only 440Nm, to match the 5HP24, but the upgraded model used the W280 S converter, had more plates in the clutches and used a 4-planet carrier in the front epicyclic, which increased this to 600Nm)



The generation 2 models have maximum input torque capacities of:

6HP21 = 450Nm
6HP28 = 700Nm
6HP34 = 850Nm

again, this varies with the torque converter used)



Phil

[SMOKEY53]

Thanks Phil - great response.

Given you know a lot on the subject, what are your thoughts on pushing the engine torque figure up forward the max design rating of the transmission?

I'm planning on doing a preventative change of the trans fluid beforehand (car is at 115k km or roughly 70 thou miles)


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