Transmission shifting question

[robert16]

So I’ve had my lovely z4 since feb and it has been a lot of fun.

I’ve noticed in the lower gears it has a rougher shift or kinda a lunge when shifting in those lower gears

Has only 37,000 miles and tranny fluid and filter have never ever been changed

Maybe new fluid and filter would smooth out those shifts

[3002 tii]

Originally Posted by robert16

So I’ve had my lovely z4 since feb and it has been a lot of fun.

I’ve noticed in the lower gears it has a rougher shift or kinda a lunge when shifting in those lower gears

Has only 37,000 miles and tranny fluid and filter have never ever been changed

Maybe new fluid and filter would smooth out those shifts

You’ll read up a lot on ways to improve shift... cdv delete, clutch stop, trans bushings, etc. I found the ZHP knob and fresh fluid (really like RP Synchromax) really smoothes things out. Then practice letting the clutch out tad slower than you’re normally accustomed to works well for avoiding the lower gear grinds.

[robert16]

I have an automatic transmission so no clutch

What is a zhp. Knob
RP synchromax, ? Auto tranny fluid

I would like to get the best fluid and filtehigy quality

Any thoughts?

[chickdr]

Transmission type is vital when asking a question like this. Automatic was buttery smooth when I drove a new 08 back in the day. I would suggest a fluid change as you said. make sure they do a complete flush to get entirely new fluid in the transmission. I would just use OEM fluid.

[Mantraxalos]

My friend's 06 Z4 Auto 130k mi has rough shifting and lunging also. Were you every able to get this fixed?

Originally Posted by robert16

So I’ve had my lovely z4 since feb and it has been a lot of fun.

I’ve noticed in the lower gears it has a rougher shift or kinda a lunge when shifting in those lower gears

Has only 37,000 miles and tranny fluid and filter have never ever been changed

Maybe new fluid and filter would smooth out those shifts