Weird tranny question. Help needed.
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Senior User
Joined: Apr 2001
Posts: 223
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From: Canton, OH
Weird tranny question. Help needed.
Hello. I've been having the following problem for the last couple months now.
My truck is a 96 F-150 Short Bed with the Mazda 5-sp. 33" tires with a 4.56" rear end. Clutch replaced about 5 months ago along with slave cylinder.
Before I have the 4.56" installed my truck was really hard to start out from a dead stop because the tires were so big. This problem was so bad that I paid mucho $$$ to have the gears changed.
Now I have another problem. I cannot start out without the whole truck violently shaking. I've tried a little clutch/little gas, little clutch/lotta gas....virtually all the combinations to start out smoothly and effectively...none have worked.
The transmission into all other gears is the exact same...truck just shakes and I cannot make a smooth shift.
What the heck is wrong? I personally think it could be the presssure plate? 100,000 miles.
What do you guys think?
NJK
My truck is a 96 F-150 Short Bed with the Mazda 5-sp. 33" tires with a 4.56" rear end. Clutch replaced about 5 months ago along with slave cylinder.
Before I have the 4.56" installed my truck was really hard to start out from a dead stop because the tires were so big. This problem was so bad that I paid mucho $$$ to have the gears changed.
Now I have another problem. I cannot start out without the whole truck violently shaking. I've tried a little clutch/little gas, little clutch/lotta gas....virtually all the combinations to start out smoothly and effectively...none have worked.
The transmission into all other gears is the exact same...truck just shakes and I cannot make a smooth shift.
What the heck is wrong? I personally think it could be the presssure plate? 100,000 miles.
What do you guys think?
NJK
Postmaster
Joined: Jul 2001
Posts: 4,038
Likes: 3
From: South Kitsap County, WA
Weird tranny question. Help needed.
Did the problem occur right after the gears were swapped, did it set in slowly? It could have been a result of trying to drive with the 33's and stock gears. Slipping the clutch to overcome the rolling resistance of the 33's could have warped the pressure plate.
If it happened right away after the gear swap, I'd say the shop owes you a refund and a rebuild. Try a 4.10 though. (IMO 4.56 is a bit low for 33's unless you're bogging and rock climbing)
-Kerry
If it happened right away after the gear swap, I'd say the shop owes you a refund and a rebuild. Try a 4.10 though. (IMO 4.56 is a bit low for 33's unless you're bogging and rock climbing)
-Kerry
Thread Starter
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Senior User
Joined: Apr 2001
Posts: 223
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From: Canton, OH
Weird tranny question. Help needed.
4.56"'s ARE way too low, but I didn't know what I was doing. I WISH I have 4.10's. Can't afford a rebuild, though.
To the guy that mentioned the pressure plate, and anyone else for that matter: Could it really be the pressure plate?
It did in fact set in slowly and not necessarily after the gear swap.
NJK
To the guy that mentioned the pressure plate, and anyone else for that matter: Could it really be the pressure plate?
It did in fact set in slowly and not necessarily after the gear swap.
NJK
New User
Joined: Jun 2002
Posts: 23
Likes: 0
From: Coeur d'Alene USA
Weird tranny question. Help needed.
It sounds like you may have burn spots on your flywheel and clutch
plate. With those low gears it puts a tremendous amount of torque on
your clutch. I just replaced my clutch, pilot bearing and internal
slave cylinder and noticed one burn spot on the flywheel and one on
the clutch plate. My truck chattered slightly when starting off in
first gear, but now it feels like a new truck. With 100k on your
clutch this would be my first quess as to your problem.
91 f150
300 six w/M5OD 5 speed
140k miles
plate. With those low gears it puts a tremendous amount of torque on
your clutch. I just replaced my clutch, pilot bearing and internal
slave cylinder and noticed one burn spot on the flywheel and one on
the clutch plate. My truck chattered slightly when starting off in
first gear, but now it feels like a new truck. With 100k on your
clutch this would be my first quess as to your problem.
91 f150
300 six w/M5OD 5 speed
140k miles
Elder User
Joined: Sep 2000
Posts: 936
Likes: 0
From: Bay area
Weird tranny question. Help needed.
when going from the stock gears to the 4.56's you have relived alot of the bogging stresses on the drive line. it makes it easier for the clutch to enguage and easier on the engine.
There is no way going to the gears he did puts more stress on the clutch than was before the gear swap.
My guess is they never resurfaced the fly wheel. I had this happen, it sucked. eventually it went away after 40k miles. but I did the work and did not feel like taking it apart again. but since you paid someone to do this. they must fix the screw up.
There is no way going to the gears he did puts more stress on the clutch than was before the gear swap.
My guess is they never resurfaced the fly wheel. I had this happen, it sucked. eventually it went away after 40k miles. but I did the work and did not feel like taking it apart again. but since you paid someone to do this. they must fix the screw up.
Post Fiend
Joined: Feb 2001
Posts: 6,624
Likes: 8
From: Missouri
Weird tranny question. Help needed.
To start out cheap and simple replace your u joints. I have seen many times where takeoff jumpiness is fixed by this alone. After that go with the advice above. It is good info.
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Senior User
Joined: Apr 2001
Posts: 223
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From: Canton, OH
Weird tranny question. Help needed.
U-Joints were replaced two weeks ago to fix a different problem. The chattering is still here.
The clutch is not original. Replaced about four months ago. Why we didn't replace EVERYTHING then is beyond me.
The only thing the shop did was replace the rear end gears. The tranny work my father and I do ourselves.
So it is everyone's opinion that I replace the flywheel, pressure plate and maybe the clutch (again?)?
Thanks!
-Nick.
The clutch is not original. Replaced about four months ago. Why we didn't replace EVERYTHING then is beyond me.
The only thing the shop did was replace the rear end gears. The tranny work my father and I do ourselves.
So it is everyone's opinion that I replace the flywheel, pressure plate and maybe the clutch (again?)?
Thanks!
-Nick.
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Fleet Mechanic
Joined: Nov 1999
Posts: 1,415
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From: Lower 48
Weird tranny question. Help needed.
I agree with the above post, it sounds like a classic case of "clutch chatter". The flywheel/pressure plate was burnt with the original gears and tall tires and now that you've put in the lower gears it has accentuated an existing problem that you didn't notice before.
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Thread Starter
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Senior User
Joined: Apr 2001
Posts: 223
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From: Canton, OH
Weird tranny question. Help needed.
Will the flywheel need to be replaced? I understand that the pressure plate and clutch should be, but flywheel is like major $$$, isn't it?
NJK
NJK
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