ZF4HP22, Fixing Leaks 

The ZF 4-HP22 is what inspired me to start my own business, almost 20 years ago. I still love those transmissions, and I have probably more than half a dozen out of vehicles, and I own probably a dozen vehicles with this type of transmission, at least two of which need repair. So much as I appreciate your videos in general, this one especially was a delight to watch. Thank you!

Thanks for taking the time to share your knowledge.

Nice job. I have the same box on a land Rover discovery 2 I lose fluid on the floor in the pipe.

Very helpful. I once had to crush a German grey market 733i because of the burnt clutches. There was no info for a kid to find in the 90s about these things. Now I have another shot at it with an '86 524td.

Thank you for the education! If you ever do a tear down of the upper and lower valve body and or other clutch packs, would you consider recording that also like you did on the hp5 series? Thanks agian, best Steve

hi you list cars with this auto box you forgot to mention the volvo 940 tic diesel mine is 1995 model the diesels all had them im sure the engine is a VW d24 6 cylinder volvo trying to make bomb proof cars back then i believe

I have a 1988 528e with automatic transmission. Is leaking when u start the car. The car has more than 300k miles on it but it was running fine before the leak. Can’t find anyone that wants to work on it. Any suggestions?? I’m guessing is just the seals are toasted.

Thanks for making this video Gary. I have a similar transmission from a Jaguar XJ40 that I'm adapting to an Aussie P76 V8 engine. I note your comments re the front A clutch 'failure issue' due to a design flaw. I'm aware of the issue but have not been able to locate the relevant documents outlining the fix. Would it be possible to post clear copies of the relevant pages so that I could take a clear screen shot of them. Once again thank you for posting this very useful video.

Also I do understand why Volvo still held on to their AW70/71/72’s in the same era they tried that ZF4HP22. Basically the Aw70-72’s are the same as the Toyota A40D series. Some 740’s from 85-88 with naturally aspirated 2.3L gas and 2.4L TDIC Diesel had the ZF4HP22. The shift indicator for the ZF 4hp22 is PRND321 and the AW70-72 is PRND21 with overdrive lockout button. The AW70-72’s Aka Toyota A40D series was more reliable for the Volvo’s 2.3L gas whether naturally aspirated or turbo.

Hey Gary. Have had a problem so started looking online and couldn’t believe the amount of detailed videos you’ve posted over the years! I have a 1995 Audi A8 4.2L Quattro automatic with what I believe is the 4HP-24a transmission. It goes forward fine but does not reverse. When you put it in reverse it sounds like the box clunks. It does engage and the car rocks back slightly but doesn’t move as you rev. I’m assuming either the F clutch or piston is knackered. Ahh well, thanks for the great vids anyway!

awesome work! if you found useful i am either working in some zf trnsmisions!

Hey Gary. Great detailed video. Thanks. Regarding the modifications to prevent the A clutch failure. You mentioned the two steps for drilling a hole in the forward clutch piston and the valve body but didn't show those steps. Where is the forward clutch piston and where in the valve body do you drill the larger hole to fix the overpressure issue. Any resources you know of?

Did you do the drilling update procedure? I remember when i lived on Long Island and they put my 93 Ford Festiva 5 speed manual on that dyno about year 2000, the car only had about 60 HP and 12 inch tires, they really seemed to abuse the vehicle in my opinion, seems that machine has become history years ago fortunately.

Hey Gary! Can you do a video showing how to remove and clean the governor valve on the 4HP22?

This Transmission is quirky and odd. But it’s not as bad as any Nissan Jatco CVT’s.

Hello Gary can I motor freight this transmission to you from Florida in a crate for you to do a complete rebuild on the clutch drums and valve bodies? Best steve

Hey Gary, i have a 535i with a ZF4HPP trans. The vehicle is only going in reverse, is it Just the forward clutch that is gone bad?

Hello, I have a 85’ E30 with this type of transmission, when the car is cold transmission works fine and after it warms up, it won’t go into reverse. What could be the problem? Thanks

hi i have a 335i with 6hp21 trans. It have harsh up shift when high rpm and 4-5 flare. What you think? Sonnax zip kit or reconditioned valve body?

What special tools are needed for this rebuild. My transmission started not up shifting from first to second then it would go into reverse. But eventually it will go into first and reverse.

Hey Gary, I have recently pulled a zf 4hp22 out of my 528e bmw and due to my lack of transmission knowledge I’m a bit lost. Is there any way I can contact you to have my transmission sent over to your shop for a rebuild? I’ve taken it apart already but haven’t made any progress. Thanks.

vehicles that had this ZF 4hp22 transmission: BMW E30's 1985-1992 , BMW E24's 1983-1989, BMW E32's 1986-1994, BMW E34's 1988-1994, BMW E28's 1981-1988, Jaguar XJ40's 3.6L I6 1987-1993, Jaguar X300's 3.2L I6 1994-1997, Land Rover Range rover's 1987-2002 (all engines except 4.6L V8's), Land Rover series I Discovery's 1992-1999 3.9L V8, Land Rover series II Discovery's 1999-2002 4.0L V8, Peugeot 505's all engine options 1986-1997, Lincoln Continental 1984-1985 with BMW-Steyr TurboDiesel, Maserati Quattroporte 2.8L V6 1994-1998, Maserati Biturbo both 2.5L and 2.8L V6's 1988-1997, Lotus Excel's SA Twin cam 2.2L I4 1986-1991, and In Brazil and south america the Chevrolet Opala with 2.5 and 4.1 engines 1988-1992.

There was a TransTec article on this trans. Since ZF refused to share any info about this unit, TransTec really took them to task. This link has a link on it, to the pdf of the original, & humorous, article. www.bimmerboard.com/forums/posts/602106

bom dia feliz dia dos pais pra voce