my drivetrain shakes a lot in 1st and 2nd.. help? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

dreamer · 04-09-2005, 02:21 PM

so i just swapped out a ka24e automatic and dropped in a ka24de 5spd... and when i drive it in 1st and 2nd gear, in the low rpm range (i dont know exactly because my tach doesnt work) the shifter shakes slightly, then more and more violently... and then i hear/feel some thing bumping against the underside of the car... i'm assuming its the transmission or driveshaft or something of the like.

anyone know what it could be? i dont think its a tranny mount and i think my driveshaft should be balanced... but what could possibly cause this?

also, my tach doesnt work. anyone ever had a tach stop working on them? i swapped in a DOHC gauge cluster with the motor.. first time i started it, the tach jumped from 0 to 1500......... then never moved again lol

EchoOfSilence · 04-09-2005, 03:47 PM

the driveshafts sound like they're not the same length, and are under load. you might need to seperate the half-shafts and put your auto rear half shaft + manual front halfshaft.

dohc cluster is not the same as the sohc.

SimpleSexy180 · 04-09-2005, 04:02 PM

if it bouncing up and down and shaking, its probably your transmission mount, plz check.

ThE_BoMB · 04-09-2005, 04:05 PM

I also agree that it sounds like the tranny bushing. Did you reuse your ka24e bushing and not replace it >? i would replace that first.

if it still happens after that then tell us and we shall go from there.

projectRDM · 04-09-2005, 06:36 PM

Make sure the paint mark on the back of the driveshaft lines up with the mark on the diff to get it close to balanced.

dreamer · 04-09-2005, 06:38 PM

Quote:

Originally Posted by EchoOfSilence

the driveshafts sound like they're not the same length, and are under load. you might need to seperate the half-shafts and put your auto rear half shaft + manual front halfshaft.

dohc cluster is not the same as the sohc.

^ the auto and manual driveshafts are completely different. the halves are different lengths/sizes... so if i mixed it , it wouldnt fit up right.

and yeah i replaced the sohc cluster with dohc because the sohc tach doesnt work with the dohc motor... but .. apparently neither does the dohc tach

i did not change the mounts or bushings. i dont know much about the drivetrain so im gunna have someone more knowledgable look at it or take it to a shop and see what they say ... when i have money... haha cuz right now i cant afford to take it to jiffy lube

EchoOfSilence · 04-09-2005, 09:16 PM

Quote:

Originally Posted by dreamer

^ the auto and manual driveshafts are completely different. the halves are different lengths/sizes... so if i mixed it , it wouldnt fit up right.

and yeah i replaced the sohc cluster with dohc because the sohc tach doesnt work with the dohc motor... but .. apparently neither does the dohc tach

i did not change the mounts or bushings. i dont know much about the drivetrain so im gunna have someone more knowledgable look at it or take it to a shop and see what they say ... when i have money... haha cuz right now i cant afford to take it to jiffy lube

actually the front halves should be the exact same length, but the rear halves are different lengths.

my240iguanas · 04-11-2005, 01:34 PM

I had the same prob , my new tranny mount bushing was $75 from the dealer

*NemeGuero* · 04-11-2005, 02:56 PM

you're wrong echo, the front half is the one that is different sizes from auto to manual

rear halves only vary from ABS to non-ABS as long as it's the same chassis

s14 blacktop · 04-11-2005, 03:00 PM

Quote:

Make sure the paint mark on the back of the driveshaft lines up with the mark on the diff to get it close to balanced.

^^this does not matter, I put and took mine off several times and the marks are not lined up and it works fine... no vibrations whatsoever...

ultraDorksGarage · 04-11-2005, 04:27 PM

Quote:

Originally Posted by EchoOfSilence

the driveshafts sound like they're not the same length, and are under load. you might need to seperate the half-shafts and put your auto rear half shaft + manual front halfshaft.

dohc cluster is not the same as the sohc.

multishaft setups are balanced together, changing/mismatching propelor shafts will be f@cked. most even have a sticker on the shaft that u must replace both sides or have rebalanced.

ultraDorksGarage · 04-11-2005, 04:31 PM

the other thing is propellor shaft imbalance/length is proportionate to wheel speed, not ENGINE speed...so like the others said check ur tranny mount first, as well as motor mounts^^

*NemeGuero* · 04-11-2005, 04:34 PM

he said that 'cuz when we did my swap, we ended up HAVING to mismatch my DS.. s14manual front, s14 auto rear.. I got no problems. I had the same vibration using the entire s14 manual DS.. I think the rear section was ABS 'cuz the fit was too tight.. i had to put in the front, rear.. and then push the center up until it 'locked in'

Me N Echo tag team tranny questions! Haha

ultraDorksGarage · 04-11-2005, 04:44 PM

working with multishaft propellor setups at work id agree that the marks matter... maybe on a short setup like a s13 it wont, but u should still put it back the way it was balanced as.

do u switch main journal caps around even though they have been line honed and marked? perhaps things worked out fine, but the idea of balancing is to negate bad forces(reduce wear on bearings/bushings), which u prolly cant feel. perhaps im too critical having worked with propellor shafts in 6 foot lengths, but still, put it back the way it was balanced.

dreamer · 04-17-2005, 12:21 AM

the driveshaft was unbalanced... the bolts in the propeller shaft were mis-matched. ....anyone have any idea as to fixing the tach?

ledzeppelin240 · 04-17-2005, 12:33 AM

Yup driveshaft not balanced and it could have esily been out of phase...Mark it before taking it apart it saves the hasle.

04-09-2005, 02:21 PM	#1
dreamer Zilvia Junkie Join Date: Mar 2004 Location: northern virginia Posts: 423 Trader Rating: (0) Feedback Score: 0 reviews	my drivetrain shakes a lot in 1st and 2nd.. help? so i just swapped out a ka24e automatic and dropped in a ka24de 5spd... and when i drive it in 1st and 2nd gear, in the low rpm range (i dont know exactly because my tach doesnt work) the shifter shakes slightly, then more and more violently... and then i hear/feel some thing bumping against the underside of the car... i'm assuming its the transmission or driveshaft or something of the like. anyone know what it could be? i dont think its a tranny mount and i think my driveshaft should be balanced... but what could possibly cause this? also, my tach doesnt work. anyone ever had a tach stop working on them? i swapped in a DOHC gauge cluster with the motor.. first time i started it, the tach jumped from 0 to 1500......... then never moved again lol

04-09-2005, 03:47 PM	#2
EchoOfSilence Nissanaholic! Join Date: Aug 2003 Location: Los Angeles/Berkeley, CA Posts: 2,238 Trader Rating: (1) Feedback Score: 1 reviews	the driveshafts sound like they're not the same length, and are under load. you might need to seperate the half-shafts and put your auto rear half shaft + manual front halfshaft. dohc cluster is not the same as the sohc. __________________ Petition Nissan to Make the IDx on http://IDxClub.co !

04-09-2005, 04:05 PM	#4
ThE_BoMB Leaky Injector Join Date: Mar 2003 Location: Vancouver BC Canada Age: 41 Posts: 131 Trader Rating: (1) Feedback Score: 1 reviews	I also agree that it sounds like the tranny bushing. Did you reuse your ka24e bushing and not replace it >? i would replace that first. if it still happens after that then tell us and we shall go from there. __________________ 1991 240SX SE I dont have any mods i swear! http://www.cardomain.com/id/the_bomb

04-09-2005, 06:36 PM	#5
projectRDM Post Whore! Join Date: Dec 2002 Location: Atlanta Age: 51 Posts: 13,812 Trader Rating: (12) Feedback Score: 12 reviews	Make sure the paint mark on the back of the driveshaft lines up with the mark on the diff to get it close to balanced. __________________ FORMERLY R240NA Learn what's really going on and protect your assets now before they're gone forever: www.paypalsucks.com

04-17-2005, 12:33 AM	#16
ledzeppelin240 Zilvia Addict Join Date: Sep 2003 Location: Sinse Posts: 688 Trader Rating: (0) Feedback Score: 0 reviews	Yup driveshaft not balanced and it could have esily been out of phase...Mark it before taking it apart it saves the hasle. __________________ Anyway, no drug, not even alcohol, causes the fundamental ills of society. If we're looking for the source of our troubles, we shouldn't test people for drugs, we should test them for stupidity, ignorance, greed and love of power. Looking for: JDM S13 OEM Sideskirts

04-09-2005, 04:02 PM	#3
SimpleSexy180 Post Whore! Join Date: Aug 2004 Location: Cal Posts: 4,750 Trader Rating: (8) Rides Gallery: SimpleSexy180 Feedback Score: 8 reviews	if it bouncing up and down and shaking, its probably your transmission mount, plz check.

04-11-2005, 01:34 PM	#8
my240iguanas BANNED Join Date: Mar 2005 Location: CAli Posts: 125 Trader Rating: (0) Feedback Score: 0 reviews	I had the same prob , my new tranny mount bushing was $75 from the dealer

04-11-2005, 02:56 PM	#9
NemeGuero No more nissan. Join Date: Jan 2003 Location: RAIN, Washington. Age: 40 Posts: 8,132 Trader Rating: (10) Rides Gallery: NemeGuero Feedback Score: 10 reviews	you're wrong echo, the front half is the one that is different sizes from auto to manual rear halves only vary from ABS to non-ABS as long as it's the same chassis

04-11-2005, 04:31 PM	#12
ultraDorksGarage Zilvia Member Join Date: Mar 2005 Location: Hawaii Posts: 204 Trader Rating: (0) Feedback Score: 0 reviews	the other thing is propellor shaft imbalance/length is proportionate to wheel speed, not ENGINE speed...so like the others said check ur tranny mount first, as well as motor mounts^^

04-11-2005, 04:34 PM	#13
NemeGuero No more nissan. Join Date: Jan 2003 Location: RAIN, Washington. Age: 40 Posts: 8,132 Trader Rating: (10) Rides Gallery: NemeGuero Feedback Score: 10 reviews	he said that 'cuz when we did my swap, we ended up HAVING to mismatch my DS.. s14manual front, s14 auto rear.. I got no problems. I had the same vibration using the entire s14 manual DS.. I think the rear section was ABS 'cuz the fit was too tight.. i had to put in the front, rear.. and then push the center up until it 'locked in' Me N Echo tag team tranny questions! Haha

04-11-2005, 04:44 PM	#14
ultraDorksGarage Zilvia Member Join Date: Mar 2005 Location: Hawaii Posts: 204 Trader Rating: (0) Feedback Score: 0 reviews	working with multishaft propellor setups at work id agree that the marks matter... maybe on a short setup like a s13 it wont, but u should still put it back the way it was balanced as. do u switch main journal caps around even though they have been line honed and marked? perhaps things worked out fine, but the idea of balancing is to negate bad forces(reduce wear on bearings/bushings), which u prolly cant feel. perhaps im too critical having worked with propellor shafts in 6 foot lengths, but still, put it back the way it was balanced.

04-17-2005, 12:21 AM	#15
dreamer Zilvia Junkie Join Date: Mar 2004 Location: northern virginia Posts: 423 Trader Rating: (0) Feedback Score: 0 reviews	the driveshaft was unbalanced... the bolts in the propeller shaft were mis-matched. ....anyone have any idea as to fixing the tach?