How serious is P0736 gearbox fault?

[M005]

2005 D3 with 284,000km on clock, major clunking & gearbox fault when I reversed up my drive (fairly steep slope) codes read as P0736 reverse incorrect ratio and P0730 Incorrect gear ratio.

No other issues other than standard LR gearbox clunks. Low box works fine.

Will a gearbox flush & service help prolong the gearbox?

If I don’t strain the box in reverse is it likely to be ok with regular service?

Or is it knackered?

Thanks

[Eric SDV6SE]

2005 D3 with 284,000km on clock, major clunking & gearbox fault when I reversed up my drive (fairly steep slope) codes read as P0736 reverse incorrect ratio and P0730 Incorrect gear ratio.

No other issues other than standard LR gearbox clunks. Low box works fine.

Will a gearbox flush & service help prolong the gearbox?

If I don’t strain the box in reverse is it likely to be ok with regular service?

Or is it knackered?

Thanks

Hi,

if if no other mechanical issues, I’d be suggesting a full flush, filter and valve body rebuild. Sounds like you need new solenoids and valve body seals. See this link for further code clarifications https://www.obd-codes.com/p0736 where it refers to faulty solenoids.

Just did my D4 at 183,000 km - well worth the trouble.

Cheers,

Eric

[M005]

Thanks Eric

Just deciding whether to spend $$$’s on this one or move it on and get something with solid history.

Can the gearbox from a Ford Territory go in given it’s the same engine?

[loanrangie]

Thanks Eric

Just deciding whether to spend $$$’s on this one or move it on and get something with solid history.

Can the gearbox from a Ford Territory go in given it’s the same engine?

No, different box.

[DiscoJeffster]

Having the same engine doesn’t mean the same gearbox as noted. And how is switching from one unknown to a new unknown any better. Take Eric’s advice and have the valve body serviced, or DIY. I’m going to do mine this year. At 250,000km mine’s showing signs of age but I believe by refreshing the valve control body it’ll hopefully better control the other parts of the gearbox lessening damage to those components

[M005]

I

Having the same engine doesn’t mean the same gearbox as noted. And how is switching from one unknown to a new unknown any better. Take Eric’s advice and have the valve body serviced, or DIY. I’m going to do mine this year. At 250,000km mine’s showing signs of age but I believe by refreshing the valve control body it’ll hopefully better control the other parts of the gearbox lessening damage to those components

Agree, wouldn’t look to switch to anything other than guaranteed recon unit.

Only bought this vehicle 2wks ago, so this is unknown too.

[Eric SDV6SE]

I

Agree, wouldn’t look to switch to anything other than guaranteed recon unit.

Only bought this vehicle 2wks ago, so this is unknown too.

The ZF boxes are great units, well engineered and more than capable of what we can throw at them. They are also precision engineered bits of kit and so need some TLC. They are easy too work on (valve bodies at least). The solenoid baskets get clogged with dirty oil, plus the valve body OEM seals degrade over time. New seals, solenoids and a quality fluid (LF6 or Penrite BMV) will make a difference. A new ZF is about 7.5K plus fitting, valve body service including all parts DIY is about 1200-1800 (depending on what ATF you choose). I haven’t checked, but I reckon having an auto shop do the valve body would set you back 2.5-3 K.