Getting a clunk or something...help
Thread Starter
|
Elder User
Joined: Feb 2015
Posts: 510
Likes: 1
Getting a clunk or something...help
When I reverse and then go forward I get a loud clunk coming from the transmission hump. Like someone is taking a hammer to it. Same thing happens when I go forward then reverse but not as loud. Truck runs great. Its a 88 F250 4x4 5 speed with a 10.25 rear.
Cargo Master
Joined: Mar 2010
Posts: 3,339
Likes: 293
From: Laramie, WY
Did you remove the driveshaft to check the joints? Play can be hard to detect with it installed.
Check the trans mount. I have seen the nuts missing from the studs before; trans slid side to side substantially and did not sound good.
Check the trans mount. I have seen the nuts missing from the studs before; trans slid side to side substantially and did not sound good.
Thread Starter
|
Elder User
Joined: Feb 2015
Posts: 510
Likes: 1
No I did a quick inspection. Left it in gear to check u joints then put it in neutral to check the rear yoke. I was leaning towards the slip yoke.....I will take the driveshaft off this weekend and check the u joints again
Elder User
Joined: Sep 2012
Posts: 505
Likes: 7
Like GoinBoarding said, check the transmission mount bolts. I'd also check the bolts holding the cross member to the frame. My mount bolts were loose & I was missing the upper bolt for the cross member on the drivers said. Correcting these issues got rid of a clunk I had (one of many clunks though).
Thread Starter
|
Elder User
Joined: Feb 2015
Posts: 510
Likes: 1
Trending Topics
Cargo Master
Joined: Mar 2010
Posts: 3,339
Likes: 293
From: Laramie, WY
Sticking slip yoke can cause a clunk on take off. In my experience, that's less of a "hammer" clunk and more like dead blow or soft clunk. Does this have a slip yoke in the transfer case or in the driveshaft?
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
Posting Guru
Joined: May 2010
Posts: 1,146
Likes: 17
From: Central Indiana
If the slip yoke is in the driveshaft, that's gonna most likely be the clunk. On my brother's Ranger, we just took the rear yoke loose, cut one of the bands holding the boot over the joint and greased it with bearing grease. A big tie-wrap worked to replace the band we removed. Hard clunk was gone after that.
Elder User
Joined: Sep 2012
Posts: 505
Likes: 7
My loose bolts sounded like a "crack" when turning a corner with a little speed. I think it was cross member mostly because I could kind of feel it in the seat.
Thread Starter
|
Elder User
Joined: Feb 2015
Posts: 510
Likes: 1
Well the trans mount is bolted up fine, no missing bolts. Could be shot but I will have to wait till Saturday to find out. No leaks from transfer case or rear diff......any other ideas? If I let off the clutch very slowly it won't clunk.
Cargo Master
Joined: Mar 2010
Posts: 3,339
Likes: 293
From: Laramie, WY
When I had a sticky slip yoke, it wouldn't clunk if I slowly accelerated. Anything quick/normal and it would. This was an auto, so little different load but same idea. You can test this by pulling the driveshaft, loading the yoke splines with grease, and reinstalling. If that cures it, either grease it once in a while or put a new yoke & U-joint in and be done with it. I replaced the yoke 150k miles ago and it has never clunked since.
Thread Starter
|
Elder User
Joined: Feb 2015
Posts: 510
Likes: 1
How do you test the trans mount? You know how in a manual when you let off too soon the vehicle will jerk back and forth, my truck did that and it popped every time. I'm leaning towards the trans mount now. Would that be more plausible now with this new symptom?
Thread
Thread Starter
Forum
Replies
Last Post
Squiggy
Clutch, Transmission, Differential, Axle & Transfer Case
19
Jul 13, 2007 08:28 PM
Cody1960
Clutch, Transmission, Differential, Axle & Transfer Case
3
Feb 21, 2002 10:51 AM