C-4 tranny question

82 GT · 05-25-2004, 04:47 PM

When I was putting my 82GT back together last winter I accidently pulled the input shaft all the way out of the tranny.
I've was told that it's important that it goes back in exactly how it came out even though it will go in other ways.
Now that I have it on the road, I notice bad vibrations,especially during de-acceleration. Do you think that since I possiblly installed the shaft wrong that it could be the problem?
I was also thinking of worn u-joints, unbalanced drive shaft or unbalanced wheels/tires.
If I get the gas pedal in the right spot then it seems to level out.
Any suggestions?

420nitro · 05-25-2004, 06:11 PM

Quote:

Originally posted by 82 GT
When I was putting my 82GT back together last winter I accidently pulled the input shaft all the way out of the tranny.
I've was told that it's important that it goes back in exactly how it came out even though it will go in other ways.
Now that I have it on the road, I notice bad vibrations,especially during de-acceleration. Do you think that since I possiblly installed the shaft wrong that it could be the problem?
I was also thinking of worn u-joints, unbalanced drive shaft or unbalanced wheels/tires.
If I get the gas pedal in the right spot then it seems to level out.
Any suggestions?

I have never heard that about the input shaft.

I have taken mine out and put back in various times and had no problems. I would look into the easiest stuff first. The tires and wheels. Then look at the driveshaft and u-joints.

Is your harmonic balancer in good shape???
my .02's

RPM427 · 05-25-2004, 09:28 PM

As long as the splines line up and its seated correctly, it will be fine. My guess would be the driveshaft, unless you had gears installed that were not set up correctly.

Rev · 05-26-2004, 09:32 PM

I don't think it matters which way it goes back in. Sounds like u-joints to me. They are faiirly easy to check, just look for slop.

Rev

82 GT · 05-26-2004, 09:52 PM

At first I thought it might be u-joints but I don't hear that familiar metal "clank" sound. I'll check it out though.

Rev · 05-26-2004, 11:21 PM

My '94 ForeRunner did the exact same thing that you described and it was the u-joints. I think you can confirm that diagnosis by getting under the car and checking for slop in the u-joints. If it's the u-joints, you should be able to see it.

Rev

82 GT · 05-30-2004, 09:16 PM

Found the problem. The driveshaft bolts were all loose!!
When I put the engine & tranny in the car, I must have only tightened them hand tight and forgot that I did that.
No vibes now!

05-25-2004, 04:47 PM	#1
82 GT Import Slayer Join Date: May 1999 Posts: 2,241	C-4 tranny question When I was putting my 82GT back together last winter I accidently pulled the input shaft all the way out of the tranny. I've was told that it's important that it goes back in exactly how it came out even though it will go in other ways. Now that I have it on the road, I notice bad vibrations,especially during de-acceleration. Do you think that since I possiblly installed the shaft wrong that it could be the problem? I was also thinking of worn u-joints, unbalanced drive shaft or unbalanced wheels/tires. If I get the gas pedal in the right spot then it seems to level out. Any suggestions? __________________ '82 GT 351W (.060)Comp Cams 274* Extreme Energy cam, ported & polished heads w/ 1.94/1.60 valves 10.3:1 flat top pistons,stealth intake, Mallory dizzy,Holley 750dp carb, BBK shorties,Flowmaster exhaust,C-4 with 3700 stall converter, B&M pro shifter,8.8 rear, 4:10's, subframes, electric fan, powermaster alternator, 4 core radiator.

05-25-2004, 09:28 PM	#3
RPM427 Registered Member Join Date: Aug 2001 Location: Huntington NY Posts: 573	As long as the splines line up and its seated correctly, it will be fine. My guess would be the driveshaft, unless you had gears installed that were not set up correctly. __________________ -1993 Mustang, 900rwhp 03-04 cobra based 4v swap, full Griggs setup, project underway -1994 Ranger w/ 427cid windsor (daily beater) check it out!

05-26-2004, 09:32 PM	#4
Rev Registered Member Join Date: Nov 1998 Location: Houston, Tx. Posts: 3,887	Doesn't matter I don't think it matters which way it goes back in. Sounds like u-joints to me. They are faiirly easy to check, just look for slop. Rev __________________ '66 Coupe, 306, 350-375 HP, C-4, 13.07 e.t., 104.8 mph, 1/4 mi. O.B.C. #2 '66 coupe

05-26-2004, 09:52 PM	#5
82 GT Import Slayer Join Date: May 1999 Posts: 2,241	At first I thought it might be u-joints but I don't hear that familiar metal "clank" sound. I'll check it out though. __________________ '82 GT 351W (.060)Comp Cams 274* Extreme Energy cam, ported & polished heads w/ 1.94/1.60 valves 10.3:1 flat top pistons,stealth intake, Mallory dizzy,Holley 750dp carb, BBK shorties,Flowmaster exhaust,C-4 with 3700 stall converter, B&M pro shifter,8.8 rear, 4:10's, subframes, electric fan, powermaster alternator, 4 core radiator.

05-26-2004, 11:21 PM	#6
Rev Registered Member Join Date: Nov 1998 Location: Houston, Tx. Posts: 3,887	My Toyota ForeRunner My '94 ForeRunner did the exact same thing that you described and it was the u-joints. I think you can confirm that diagnosis by getting under the car and checking for slop in the u-joints. If it's the u-joints, you should be able to see it. Rev __________________ '66 Coupe, 306, 350-375 HP, C-4, 13.07 e.t., 104.8 mph, 1/4 mi. O.B.C. #2 '66 coupe

05-30-2004, 09:16 PM	#7
82 GT Import Slayer Join Date: May 1999 Posts: 2,241	Found the problem. The driveshaft bolts were all loose!! When I put the engine & tranny in the car, I must have only tightened them hand tight and forgot that I did that. No vibes now! __________________ '82 GT 351W (.060)Comp Cams 274* Extreme Energy cam, ported & polished heads w/ 1.94/1.60 valves 10.3:1 flat top pistons,stealth intake, Mallory dizzy,Holley 750dp carb, BBK shorties,Flowmaster exhaust,C-4 with 3700 stall converter, B&M pro shifter,8.8 rear, 4:10's, subframes, electric fan, powermaster alternator, 4 core radiator.

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