Auto gearbox query

[Mzx944]

Hey

I have a 1997 S6 avant automatic (AAN) and I'm getting some unusual scratching/thudding noises when coasting and braking while in gear but not while in neutral

Assume box is on the way out (160k miles) but havent had it apart yet, preparing for the worst case scenario so just looking at my options

The car has a CRG / CLK box / diff and the box is stamped with ZF 4HP-18 (1050 020032)

Is my only option to get another box with the same 1050 020032 or were there other options

I can see one on ebay currently (stamped 1050 060011) listed as a C4 S6/S4 box but there isnt a great deal of info online around the auto boxes in these cars

Any advice is massively appreciated!

Max

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[5cylinderman]

I'd suggest calling Ashcroft Transmissions in Luton. The 4HP 18 is not a strong gearbox. They might have options for upgrades.

[Mzx944]

I'd suggest calling Ashcroft Transmissions in Luton. The 4HP 18 is not a strong gearbox. They might have options for upgrades.

Thanks for the recommendation - will give them a buzz tomorrow and see if they have any suggestions on alternatives

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[Dynasty]

The 4HP 18 works ok if you run stock power (on a stock auto car the boost is limited to 0.8 bar (torque limit)).

[Mzx944]

I'd suggest calling Ashcroft Transmissions in Luton. The 4HP 18 is not a strong gearbox. They might have options for upgrades.

Unfortunately they cant help me with this one - thanks anyway though

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[Mzx944]

The 4HP 18 works ok if you run stock power (on a stock auto car the boost is limited to 0.8 bar (torque limit)).

Oh really? Im sure mine boosts to 1.2-1.3

Suggests mine might be mapped then!

I've managed to source a back up box from europe for £500 as prep for the worst case scenario.. so hopefully manage to sort it one way or another as it may be diff or something else and not sctually the box because it still drives and shifts perfectly fine

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[vag_noob]

PRJ chip with 1.9 bar wastegate spring, +1.3 also, much better than stock, no issues.