Thud sound when shifting?

[SkateOrDie]

I have my 300zx that when ever I shift it sounds like the tranny box or something makes a loud thud noise, It doesn't jam and I'm not forcing the gear in , i don't know what I could be? I doubt it's the clutch, so any suggestions? Or are other 300's the same way with their transmition?

[92SEric240sx]

is your diff/ trans mounted securely, I had a diff that would smack the subframe because one of the bolts backed loose

[coupesallday!]

http://zilvia.net/f/chat/297481-small-questions-thread-search-first-use-instead-making-new-threads.html

[bussitcustoms]

Subframe bushings are beat.

[Kingtal0n]

Could also be that the differential has a significant amount of wear.

[Xplat]

I have this same problem. Started happening right after I installed my S15 HLSD. I haven't really looked into it yet as I have the car on jackstands again. But I think it's that I needed to reshim my LSD after I put it in OR that my diff mounting bolts weren't torqued down right as I remember tightening the diff bolts down while the diff was in the air instead of resting on the subframe.

[SkateOrDie]

http://www.youtube.com/watch?v=uae7ZIp7mhE&feature=youtube_gdata_player

That's about as close as I can get to that thud sound you can kindah hear it, sorry if that dude talking at the beginning gets annoying just fast forward to when he drives!(x aha

[rcdad123]

check motor/tranny mounts and diff mount bushings.

[SkateOrDie]

Does anyone know how much that would run me into? $$

[KravingAKouki]

could it possibly be your transfer case?

[SkateOrDie]

Transfer case? What do you mean

[ExiledLakai]

Does anyone know how much that would run me into? $$

Jack up your car. Put a wrench into your right hand and start tightening anything that is loose and check for blown bushings. No one can tell you a price for something you haven't diagnosed. Grow some man hair, get dirty, and figure it out....

[dirtyslider]

ya i had a similar problem check all mounts and bushings if its a big enough gap to make a thud its a big enough gap to see i havnt paid for work on my car since day one

[Om1kron]

Subframe bushings are beat.

THIS is correct

[~s14~]

THIS is correct

and THIS is correct as well....or at least im 99% sure.

I have the same problem on the s14 i just got and i lifted it in the air and used a screw driver to pry on subframe at the bushings and what do you know...without any muscle or force the subframe starts dancing around

[nissanfreak317]

Just out of curiosity, could this be fixed with subframe collars?

I have a clunk in the rear of my S13 every time I make a hard turn and I'm pretty sure it's blown subframe bushings. Anybody ever tried this as a fix?

For reference: DIF 10039 Aluminum Subframe Spacers Collars Kit S13 S14 240SX (http://www.frsport.com/DIF-10039-Aluminum-Subframe-Spacers-Collars-Kit-S13-S14-240SX_p_15323.html)

Sorry for thread jack, it just reminded me of it.

[Mitsubayati]

Test Driving a Nissan 300zx TWIN TURBO!!!!! - YouTube (http://www.youtube.com/watch?v=uae7ZIp7mhE&feature=youtube_gdata_player)

That's about as close as I can get to that thud sound you can kindah hear it, sorry if that dude talking at the beginning gets annoying just fast forward to when he drives!(x aha

I just want to slap everyone in that video. Especially the driver. Annoying as fuck

[94_240sx]

I have this same problem. Started happening right after I installed my S15 HLSD.

Same here. I thought I shimmed right, but I guess not. It's only the very first shift out of my garage. After that it never makes a noise. A friend of mine also swapped his diff with s15 HLSD and his makes noise all the time.