4th gear jumping (auto box)

goltho · 15th April 2024, 16:58

Just recently, I've been noticing a small jump or slip after manually shifting from Drive to 4 whilst decelerating. The box shifts down ok but after 3 seconds or so from when 4th gear engages and takes up the momentum on the overrun, it has a little slip and then continues to let the car overrun. It's consistent every time I do it. No other anomalies are apparent in any gear under any other circumstances.

Any ideas?

Dougie.

daveo138 · 16th April 2024, 08:44

When was the transmission fluid last changed?

goltho · 16th April 2024, 08:52

Quote:

Originally Posted by daveo138

When was the transmission fluid last changed?

I don't know if it ever has been but I suspect never. In fact, I've planned for changing it once some good weather stabilises as I've done on all my previous 75s. The tranny's otherwise responsive, moreso than others I've had. Is this symptom a known issue with old fluid?

Dougie.

goltho · 18th April 2024, 18:10

I've still not unearthed any further info. Any clues anyone?

Dougie.

SD1too · 18th April 2024, 19:13

Hi Dougie,

Most automatic transmission apparent faults are down to one of two things, or both of them:

Engine tune
Transmission fluid level

What's the mileage of this engine Dougie?

Simon

goltho · 18th April 2024, 19:40

Quote:

Originally Posted by SD1too

Hi Dougie,

Most automatic transmission apparent faults are down to one of two things, or both of them:

Engine tune
Transmission fluid level

What's the mileage of this engine Dougie?

Simon

Evening Simon,

Thanks for that. It's 137k as per my sig.

Dougie.

15th April 2024, 16:58	#1
goltho Can't help myself Rover 75 CDTi 2005 Join Date: Jan 2018 Location: Lincoln Posts: 877 Thanks: 469 Thanked 150 Times in 113 Posts	4th gear jumping (auto box) Just recently, I've been noticing a small jump or slip after manually shifting from Drive to 4 whilst decelerating. The box shifts down ok but after 3 seconds or so from when 4th gear engages and takes up the momentum on the overrun, it has a little slip and then continues to let the car overrun. It's consistent every time I do it. No other anomalies are apparent in any gear under any other circumstances. Any ideas? Dougie. __________________ R75 C2 RJBLH Connoisseur CDTi Auto Saloon • Built 08/02/2005 @14:57 hrs: Registered 26/08/2005 • 122nd of 141 built that day • British Racing Green Pearlescent (HFF) • Sandstone leather with black piping (SPJ) • 139,000 miles Last edited by goltho; 15th April 2024 at 17:00..

18th April 2024, 18:10	#4
goltho Can't help myself Rover 75 CDTi 2005 Join Date: Jan 2018 Location: Lincoln Posts: 877 Thanks: 469 Thanked 150 Times in 113 Posts	I've still not unearthed any further info. Any clues anyone? Dougie. __________________ R75 C2 RJBLH Connoisseur CDTi Auto Saloon • Built 08/02/2005 @14:57 hrs: Registered 26/08/2005 • 122nd of 141 built that day • British Racing Green Pearlescent (HFF) • Sandstone leather with black piping (SPJ) • 139,000 miles

18th April 2024, 19:13	#5
SD1too Doesn't do things by halves Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model. Join Date: Mar 2007 Location: Former Middlesex Posts: 20,464 Thanks: 1,587 Thanked 3,749 Times in 3,181 Posts	Hi Dougie, Most automatic transmission apparent faults are down to one of two things, or both of them: Engine tune Transmission fluid level What's the mileage of this engine Dougie? Simon __________________ "Whatever is rightly done, however humble, is noble." Sir Henry Royce.

16th April 2024, 08:44	#2
daveo138 Gets stuck in Rover 75 Tourer Join Date: Mar 2022 Location: Chesterfield Posts: 699 Thanks: 206 Thanked 69 Times in 53 Posts	When was the transmission fluid last changed?