Clutch Problem

[drwells42]

All,

I have a 2007 "base" model V-6 with a 5-speed.

Sometimes, on the highway under heavy acceleration, (well, as heavy as a V-6 Mustang can manage) it seems like the clutch is slipping. RPMs go up, but nothing seems to get to the rear wheels.

Is this an issue with the clutch itself, or is it a hydraulic problem?

DRW

 

[StockishS197]

The easiest test is to put the trans into high gear on the highway and go WOT, and if RPMs climb but not speed, the clutch itself is bad.

A hydraulic issue or bad TOB would typically show issues shifting gears, not with clutch slipping.

How many miles on the clutch?

 

[Dino Dino Bambino]

All,

I have a 2007 "base" model V-6 with a 5-speed.

Sometimes, on the highway under heavy acceleration, (well, as heavy as a V-6 Mustang can manage) it seems like the clutch is slipping. RPMs go up, but nothing seems to get to the rear wheels.

Is this an issue with the clutch itself, or is it a hydraulic problem?

DRW

That's a classic case of clutch slip due to a worn friction plate.

 

[86GT351]

That's a classic case of clutch slip due to a worn friction plate.

This is correct. However to answer the OP question.....When you replace the clutch on these vehicles, you always replace the hydraulic throwout bearing!

 

[Dino Dino Bambino]

This is correct. However to answer the OP question.....When you replace the clutch on these vehicles, you always replace the hydraulic throwout bearing!

I'd go even further and replace the whole clutch assembly (frictionand pressure plate), throwout bearing (aka slave cylinder), crank pilot bearing, replace the crappy stock plastic hydraulic line with a braided SS unit, and possibly replace the flywheel depending on its condition. At the very least the flywheel will likely need resurfacing since friction plate slippage would have likely left friction burns on it.

 

[Mustang777]

yea, it definitely sounds like a bad clutch, and Dino's advice is spot on. While you're in there already, replace everything clutch-related since it's all accessible at the same time.

How many miles are on the car, and has the clutch ever been replaced before?

 

[86GT351]

yea, it definitely sounds like a bad clutch, and Dino's advice is spot on. While you're in there already, replace everything clutch-related since it's all accessible at the same time.

How many miles are on the car, and has the clutch ever been replaced before?

This is called oing the job once. Not twice.

 

[roddy]

I also have a 'base' 2007 V6, and replaced my clutch a few years back. 2007 is a transition year for the clutch in the V6 Mustang. At some point in '07, ford changed to a dual-mass flywheel, and you'll need your VIN number/build date to get the right parts to work with your flywheel. Mine was built in Feb '07, and still had the solid flywheel.

One aftermarket solution (and the one I used) is the LuK RepSet. It comes with a new solid flywheel, and can replace either style because of it. In addition to the flywheel, the kit includes clutch disk, pressure plate, slave cyl/throw-out bearing, pilot bearing, and alignment tool. There may have been some bolts in there too...I can't recall. The kit # is 1107202.
The only other things I had to buy were a reverse Torx socket (E-Torx?) for the odd flywheel bolts, and the braided clutch line Dino mentioned.

My 4.0 is not stock, and puts down just over 300hp and about 315lbs/ft to the tire. I don't drive it like I stole it, but I don't take it easy either, and the clutch has stood up with no issues.

 

[Sloane]

If the clutch only slips under hard acceleration, it is often worn friction material or a weak pressure plate. Hydraulic issues usually cause a soft or inconsistent pedal, not full slip. Check fluid level and try a low-speed stall test to see if the clutch still grips properly.