Hot Rod Forum : Hotrodders Bulletin Board - Reply to Topic
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Transmission - Rearend> Transmission vibration
User Name
Password
lost password?   |   register now

Thread: Transmission vibration Reply to Thread
Title:
  
Message:
Trackback:
Send Trackbacks to (Separate multiple URLs with spaces) :

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Additional Options
Miscellaneous Options

Topic Review (Newest First)
10-29-2011 04:55 PM
Crosley I have merged bobs36ford two separate threads into one on this vibration problem.

In the earlier photos the drive shaft angles are incorrect and the yoke at the transmission appears too far out if the vehicle is at ride height when photo was taken
10-29-2011 03:55 PM
Bobs36ford
Trans vibration

The bushing in the trans tailshaft seems to be OK....only about 1/64 play when I push it up & down.
I will have to pull the drive shaft to measure and see if i have the 3/4 backing out play

However I do have too much play when shafting from drive to reverse. This makes a bump noise. I cut idol speed down but didn't help.

I'll try to get to pull drive shaft soon.

Thank you for your advise

Bob
10-29-2011 03:25 PM
Frisco
Quote:
Originally Posted by Bobs36ford
My 36 Ford has a 350 Chevy engine with a Chevy turbo transmission. I have a vibration at 20 MPH when engine is pulling. The U joints have been eliminated and a back yard mechanic says it could be my trans. Is that possible or do you have any other ideas?

Bob
Did you check to see that the front yoke is installed to the correct depth on the trans spline?

This was previously covered on your two earlier posts concerning the vibration.

If the front u-joint yoke is not inserted far enough into the trans tailshaft, you will experience vibration as well as premature failure of the trans rear seal and the bushing in the trans tailshaft as well as the front u-joint.

In the pics you posted it appeared that the yoke was not in far enough. The only way to correct that is by having the driveshaft length made longer to enable the front yoke to be installed at the correct depth.

The correct depth is usually found by inserting the yoke all the way in and then backing it out about 3/4". When the yoke is installed this way the correct driveshaft length can be determined by measuring from the center of the front u-joint to the center of the rear u-joint.

Your "backyard mechanic" may be correct if the transmission mounting bolts are missing and/or the mount itself is broken. I would expect the vibration to occur more often than at 20 MPH if that were the case.
10-29-2011 02:15 PM
Bobs36ford
Transmission vibration

My 36 Ford has a 350 Chevy engine with a Chevy turbo transmission. I have a vibration at 20 MPH when engine is pulling. The U joints have been eliminated and a back yard mechanic says it could be my trans. Is that possible or do you have any other ideas?

Bob
10-07-2011 06:33 PM
Frisco
Quote:
Originally Posted by prostreet6t9
Its hard to tell by the pic... Depending on how long that slip yoke is,it almost looks like the D/L may be a little short.
The yoke does appear to be too short. The rear seal on the trans tail shaft appears to be worn out. There also looks like three rings worn into the O.D. of the slip yoke. Evidently they are old, as they are rusted looking in the pic.

If the yoke is in fact too short, it can not only wear out the seal quickly but it could be the source of the vibration.

The angle doesn't appear to be anywhere near 20 degrees in the pic. How did you determine the angle?
10-07-2011 04:53 PM
prostreet6t9 The rear is almost "Too" straight. With a little Spring wrap the pinion may go above the center line. But.... If you raise the front,the rear may look pretty good. I would mess with the front first and see how it turns out.
10-07-2011 04:19 PM
Bobs36ford
Quote:
Originally Posted by prostreet6t9
I would raise the rear up a little. Take a 1/2" of washers and put them in between the trans mount and the trans with the mount bolts going thru the washers. Run the car on jack stands and see if it helps any. You can experiment with the thickness to see if you can make the shake better or worse.

If you find a spot that makes it better you can make a aluminum spacer with the thickness that worked best.

Its hard to tell by the pic... Depending on how long that slip yoke is,it almost looks like the D/L may be a little short.

If you get a chance you might post a pic of the rear angle also.
It sounds like a great idea. I'm going to take you advise right away. This problem started when i raised the front end 2 inches
10-07-2011 04:09 PM
Bobs36ford
Quote:
Originally Posted by prostreet6t9
I would raise the rear up a little. Take a 1/2" of washers and put them in between the trans mount and the trans with the mount bolts going thru the washers. Run the car on jack stands and see if it helps any. You can experiment with the thickness to see if you can make the shake better or worse.

If you find a spot that makes it better you can make a aluminum spacer with the thickness that worked best.

Its hard to tell by the pic... Depending on how long that slip yoke is,it almost looks like the D/L may be a little short.

If you get a chance you might post a pic of the rear angle also.
Thanks for the info. I just posted pic of rear u joint
10-07-2011 04:01 PM
Bobs36ford
u joint angle

Rear u joint angle
10-07-2011 01:38 PM
fwinter01
engine and driveshaft angle

2-5 degrees on drive shaft with engine intake level bubble left to right front to back for float level
10-07-2011 01:07 PM
prostreet6t9 I would raise the rear up a little. Take a 1/2" of washers and put them in between the trans mount and the trans with the mount bolts going thru the washers. Run the car on jack stands and see if it helps any. You can experiment with the thickness to see if you can make the shake better or worse.

If you find a spot that makes it better you can make a aluminum spacer with the thickness that worked best.

Its hard to tell by the pic... Depending on how long that slip yoke is,it almost looks like the D/L may be a little short.

If you get a chance you might post a pic of the rear angle also.
10-07-2011 12:22 PM
cobalt327 That looks like a lot to me... But 20 degrees? In any event, I believe dropping the front of the engine will help if it's nose-up (what is the attitude of the engine in the frame?), possibly also lowering the engine if it can be done w/o major surgery.
10-07-2011 10:56 AM
Bobs36ford
u joint angle

See 2nd attachment
10-07-2011 10:45 AM
Frisco
Quote:
Originally Posted by cobalt327
Ok, I got it, thanks.

OT- whose wheels are those (brand), on the '32(?) in your avatar, and do you like them, good chrome, any probs. w/them? I'd like a set for my wagon.

Am I the only one who can't see it?
I can't see the photo either. It's not attached to the post.

The chrome wheels on the '28 Ford Pickup were purchased thru Coker in Chattanooga. I'm not sure who they got them from. Excellent chrome and no problems with them.
10-07-2011 10:40 AM
cobalt327 Ok, I got it, thanks.

OT- whose wheels are those (brand), on the '32(?) in your avatar, and do you like them, good chrome, any probs. w/them? I'd like a set for my wagon.

Quote:
Originally Posted by Bobs36ford
attached is picture of u joint angle
Am I the only one who can't see it?
This thread has more than 15 replies. Click here to review the whole thread.

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


All times are GMT -6. The time now is 05:34 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.