So the 8.8 exploder rear end is complete. I have finally finished a 2 month project that was supposed to take a weekend. It took so long because i was doing it a buddy's house whom happened to live 45 min away. the 1.5 hours of trip time coupled with the set up and clean ups really put a hinder to the speed of this swap. Next time big projects will be done at home.

To GunJam, Kalli and all the fellas that have been helping me with the viration problem thank you. I found out that the whole time the problem was my trans. i realized this when i got the rear end back together the vibration that i had there before was still there and just the same as before.

I thought that it was the engine balancing. i had some discussions with the engine builder about balancing and i was sure that they had done it wrong. they were and still are willing to repair it if that is the issue.

while i was driving i took the car the speed where the vibration was the worst and shut the engine down and pushed in the clutch. the vib was still there. So bingo! it was not the rear end, it was not the drive shaft, it is not the engine. that only leaves the trans.

so i am now searching for a new , used T5>

thank you all. i will post up the rear end conversion how to and the stpes i took once i have time to organize the pics and stuff.

 

Drive shaft imbalance will not go away under the conditions you describe. When you depress the clutch, with the car still moving, it still rotates exactly the same.

 

2+2, i understand however the vibration is there if the car is sitting still. with or without it in gear.

i am going to install a T5 that a buddy has in his fox and i am %100 sure that it will cure the problem.

I know that it is coming from the lower carrier in the T5. I had a T5 specialist tell me that even though the car is not moving, the input shaft and the lower carriers in a T5 are always moving. Even with the clutch in there is friction between the disc and pressure plate that is enough to rotate the insideds of the trans. It all make sense to me and i will be doing a huge wright up on it one i solve it.

As you will see in my post above. I have a brand new drive shaft that was new to my car. The vibration did not change.

I also set the pinion angle to the correct specs and it did not change!

I am sure it is the trans.

 

OK, try this. Run the engine, car not moving, transmission in gear, clutch depressed all the way. Only the engine, flywheel, and pressure plate will be turning, the transmission will not be in any way, and even the clutch disc will not be turning. If it vibrates then, it is either the pressure plate, flywheel, or engine.

 

er, what? that's physically impossible unless the trans is in neutral. there is no manual trans in the world that works that way. the input shaft and the output shaft are intermeshed. if one is moving, the other is moving.

 

jcoby

I appritiate the input, however, the input shaft is alway turning. even with the clutch in! it not really under any force though.

the thing is, it vibrates wether the car is moving or not. Also, if i am up to speed where the vibration is the strongest and i puch in the clutch and shut off the engine, it doesnt go away!

If the car is sitting still out of gear and you rev it, the vibration is there.

 

If the trans is in any gear, and the car is not moving, the input shaft CANNOT turn. Period. Flat statement. Prove me wrong. I'll bet you a beer. I'll take all the free beer I can get.

Try this: Take any manual transmission you want. Put it in gear. Put a slip yoke on it, and clamp the yoke so it cannot turn. Try to turn the input shaft. You can't.

Who told you this? Make him pay for the beer.

 

the input shaft is turning in exactly two situations: the trans is in neutral and the engine is running and the clutch is engaged and when the trans is in any gear and the car is moving. (yeah, there can be some spinning due to drag and fluid inertia in neutral with the clutch disengaged if the car is moving. it's very minor.)

you said it vibrates if you rev the car in neutral at a stop. does it vibrate if you rev the car, in gear, at a stop?

it does sound trans related from what you describe. possibly a worn input shaft bearing or even an out of balance friction plate.

 

i agree with your statements, however there is one thing that is throwning off for me. while driving, if i push in the clutch and shut off the ignition so the engine is off and the car is coasting i still have a vibration.

 

Apparently my efforts have failed on an epic proportion. I really thought i did a better job of explaining that input shaft thing than I did.

forget everything your "specialist" told you

as Jacoby, 2+2, and my self have stated if the car is in gear at a dead stop with the clutch in and engine running trans input shaft RPM is ZERO! Why? The sliders lock the input shaft to the main shaft which is locked to the DS If the DS does not spin the main shaft CAN NOT turn. Its important for diagnostics that you at least believe us even better if you can understand the concept.

SO what does this mean??

Billy states that the vibration is similar in the above described condition so it CAN NOT be the trans because NOTHING in the trans is turning. (Dont stop reading yet)

BUT

Billy also states that the vibration is worse when its moving and continues when he pushes in the clutch at the speed causing the vibration and does so after he kills engine. this cries out Drive Shaft (DS)

So Im thinking perhaps its two separate vibrations that combine to one larger one.

So now is the important part of this message.

Billy if you listen to one piece of advice given on this forum now would be a great time to do so and to set aside your preconceived ideas and just try these simple test and by try I mean to actually physically do them and not say "oh yeah I think thats what it does or doesnt do"

Test 1

1) put the car in gear, put the clutch in and start the engine.
2) rev up the engine slowly from idle to 3000 rpm
3) feel for vibrations are there any at all? If yes do they get worse then go away as RPM climb or do they continue to get worse and worse as rpm climb?

Test 2

with at least the rear wheels on the ground (front can be on jack stands) slide under the car and press with strong force up and down on the slip yoke and watch for play right where the slip yoke enters the tail shaft of the trans. Can you see and or feel a noticeable amount of up and down movement in the slip yoke? IF yes this is the source of the vibration you felt when you turned the engine off. (IF the rear wheels are turning the DS is turning NO MATTER WHAT) Now replace slip yoke and tail shaft bushing (both easy jobs and tail shaft can be removed from trans for bushing replacement with trans in car)

I think you have a DS vibration AND an engine vibration.

-Gun