driveline shudder in 1st, Rev
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Laughing Gas
Joined: Jul 2003
Posts: 1,224
Likes: 19
From: scotia. NY 12302
driveline shudder in 1st, Rev
49 F1, newly rebuilt flathead v8 3spd light duty tranny, new clutch kit,new pilot and throwout bearings, PP, C plate. 9" rear put in 2 years ago (3.50). new driveshaft made up for new rear, new universals. used a shim to set angle of the rear end parallel to the engine. i had the shudder prior to and after the new driveshaft and rear end. i was blaming it on the clutch which indeed was warn and splitting (which i am learning is prob not the cause of shudder). it persists now ever with the total new clutch kit and turned fly wheel. i'll start by checking the u-joints and rechecking the angles. any insight is welcome. dick r.
Fleet Owner
Joined: Jul 2004
Posts: 27,294
Likes: 1,055
From: NM
Try this: don't baby the clutch. Slip it more than needed at every opportunity for 100 miles. These are heavy-duty clutches and they need to be broken in. Mine has been in there for 6 yrs and when I pulled my engine the machining marks on the flywheel were all still there except for a few spots around the edge. I've just been too gentle on it.
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Laughing Gas
Joined: Jul 2003
Posts: 1,224
Likes: 19
From: scotia. NY 12302
the front motor mounts are virtually new, the tranny mount seemed to be fine. we've had the clutch linkage out, it's a little worn, we'll take a look at that and do some clutch slipping too. as of now, i give it some gas and power through it quickly, only prob comes in tight spots in parking lots, etc. everything else is working great, can't compain. dick r.
Cargo Master
Joined: Mar 2001
Posts: 2,759
Likes: 70
From: Elk River, MN
My 56 had the same symptoms in first and reverse when the clutch started to engage. Took me a couple years to determine the front motor mount bolts were not correct. The bolts were tight but the bolts were only threaded for about 1/2" when they needed to be threaded for 5/8". I blame it on the previous owner like the other items he gets credit for.
Laughing Gas
Joined: Jun 2011
Posts: 1,041
Likes: 53
From: Sterling CO
I tend to side with Ross's analysis on this, when I changed out trannys to the T5 I discovered that even after at least a 1000 miles (no real idea when the PO might have done it) my stock clutch disc still showed the factory paint (QA mark) on the friction surface. I've worn out clutches behind little 302's and tend to baby the clutch cause I hate all the work of replacing em...
I put up with the shudder for a 100 miles or so after changing the T5 in, then figured out that if you are a little less gentle it shudders a whole lot less.. After 500 miles it's really settled down.
I put up with the shudder for a 100 miles or so after changing the T5 in, then figured out that if you are a little less gentle it shudders a whole lot less.. After 500 miles it's really settled down.
Believe Nothing
Joined: Jun 2004
Posts: 7,514
Likes: 398
From: W. Central FL.
I take from your explanation that the 'shudder' is as the clutch is engaging and before the driveline starts to turn. Don't over look the possibility of the transmission and bell housing not being parallel with the flywheel.
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Laughing Gas
Joined: Jul 2003
Posts: 1,224
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From: scotia. NY 12302
ok, based on feedback from here and having a couple of people drive the truck, i'm going to start with a new transmission mount. the front mounts are fairly new, rear looked ok, but?? i have learned how to get going most of the time with little or even no vibration. done improperly, it can really shake the truck. since the issue goes back to the previous engine, clutch to this engine, clutch, it must be something that hasn't changed. i'm fine with replacing the tranny mount even if it is not the complete solution. expecting it in the mail friday.
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Elder User
Joined: Jun 2013
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From: Metro Detroit-MI
In all honesty.. sounds like the flywheel might need to be machined (didnt see it listed in the post)
If it was hot spotted and not trued, then that will for sure cause the shudder. It will be most noticeable when starting from a dead stop. slipping the clutch more will cover that up, however, it will ruin the new clutch and pressure plate
If it was hot spotted and not trued, then that will for sure cause the shudder. It will be most noticeable when starting from a dead stop. slipping the clutch more will cover that up, however, it will ruin the new clutch and pressure plate
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Laughing Gas
Joined: Jul 2003
Posts: 1,224
Likes: 19
From: scotia. NY 12302
we did have the flywheel resurfaced, although i hadn't mentioned it. i'm going ahead with changing the rear tranny mount (just because it looks really ugly) and it also looks like the front of the engine is a little off center to the right in the motor mounts, we'll lever that over when we do the tranny mount. i can launch it fairly well with sufficient gas. the problem comes when you get a vibration and inadvertently make it worse. we'll check everything we can, pinion angles, etc. am also looking into ross's research in a mis-match between bell housing, starter plate. i'll report back any news. thanks for all the suggestions. dick r.
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Laughing Gas
Joined: Jul 2003
Posts: 1,224
Likes: 19
From: scotia. NY 12302
ok, ready to put this thread to rest. i installed a new transmission mount (with some consult time from ross). my old one had completely separated. i still have a little shudder at start in 1st, but much more manageable. no bone shattering vibration i got ocassionally before. i also managed to center my engine in the front motor mounts, they had been off by 1/4" before. my remaining shudder may be new clutch break in, maybe something else. much improved though, having a transmission mount actually attached to the truck. thanks to all who contributed ideas.
Elder User
Joined: Jun 2013
Posts: 949
Likes: 0
From: Metro Detroit-MI
glad to hear it all worked out.
Let us know if the shudder gets better or worse with time.
sidenote, you arent feeling an engine misfire and mistaking it for a driveline vibration/shudder correct? not to insult you intelligence but I have seen this happen before.
Let us know if the shudder gets better or worse with time.
sidenote, you arent feeling an engine misfire and mistaking it for a driveline vibration/shudder correct? not to insult you intelligence but I have seen this happen before.
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Laughing Gas
Joined: Jul 2003
Posts: 1,224
Likes: 19
From: scotia. NY 12302
mustang mike, the rebuilt engine seems to run perfect. it runs strong through all the gears, delightful. i also can start in 1st some of the time with no shudder, just have to fine tune my release. i will update later if it goes away entirely. thanks for your suggestions, dick r.
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