Big ol' Clunk in reverse
Thread Starter
|
Cargo Master
Joined: Jan 2019
Posts: 3,369
Likes: 16
From: Caraway, AR
Looks like a new shift modulator is needed. Wouldn't hold vacuum. Then after enough trans fluid leaked out it sealed enough to hold vacuum. Wonder what's available.
Looks like I need a green band, $40 special order from oreilly or $20 from https://cobratransmission.com/modula...hoCQbcQAvD_BwE
Looks like I need a green band, $40 special order from oreilly or $20 from https://cobratransmission.com/modula...hoCQbcQAvD_BwE
Thread Starter
|
Cargo Master
Joined: Jan 2019
Posts: 3,369
Likes: 16
From: Caraway, AR
Haven't. I'm still tinkering with the engine. Spent yesterday picking the shop up so I have room to work again. Still not done. Going to pull the fan and shroud and belts to make it easier to get a wrench on the dampener. Pmuller Explained how I can use the push rods to check the cam. Been playing with that for a few days, the engine was rebuilt in 2015 is my best guess. Looks like it was a marine block. Guy I got it from didn't know anything about it. But all the accessories were remanufactured in 2015 and the mileage was 32k. So I'm hoping they rebuilt it in 2015 and reset the odometer, but that's a pretty big stretch. I'm trying to figure out how the engine was built. Compression is high on it, I think it's been bored .040 over, but I never got an accurate read on the numbers on the piston with my borescope. I pretty much almost read the number, then the scope moved and I never could find the number again. So after I get done playing with that and tweak the carb some and get the engine running like I feel it should be I'll work my way back.
Thread Starter
|
Cargo Master
Joined: Jan 2019
Posts: 3,369
Likes: 16
From: Caraway, AR
So, back to this issue, noise has gotten louder. Spring swap has the rear of the truck up too high. About two inches difference between the wheels at front and rear. Pinion angle is a little rough. That may have something to do with it. Don't know enough about it. May pull the carrier and see what it looks like. That would interfere with out of sight out of mind though. I know it's got decent fluid. And it's not any looser than a tooth. Maybe a degree or two. But without pulling it apart I can't even guess at where the slop is. You guys tear any 9" rear ends apart in the last six months?
Thread Starter
|
Cargo Master
Joined: Jan 2019
Posts: 3,369
Likes: 16
From: Caraway, AR
Oh, shoot, I forgot to add that part into the update. Remember awhile back I was asking about the idle drop in gear and how the truck decided it needed 750 to get down to 550 in gear? I run between 5-550 at all times now, can't go no lower. Been considering bumping it up. I replaced the rear mount when it was shot and that got rid of another new problem, but the rear end still loads up when I brake, slams into GO when I let off.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
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
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
Thread Starter
|
Cargo Master
Joined: Jan 2019
Posts: 3,369
Likes: 16
From: Caraway, AR
It was finally time to replace tires, so I went with a 31" and I think the ones that came off were 28.5" and well worn. They have completely aggravated all the horrible noises the truck makes. I was comparing speedometer readings to actual speed so I could figure out which driven gear I need to swap in. Managed to get the ol' passing gear engaged and that happened with a bang! The up and down shift were both very violent and loud. One thing I've noticed I never added to this thread is that the tag for the rear-end shows 2.75 gears and I have since calculated them at 3.00-3.08(can't remember which). And with all of that, I'm going to end up pulling the chunk. My gut is telling me that instead of swapping in a new assembly, the original was rebuilt with different gearing and it wasn't shimmed right, or the preload was wrong. Also, I got new u-joints but haven't installed them yet. They're in the "when I get around to it" pile along with an all new braking system.
Cargo Master
Joined: Oct 2016
Posts: 2,738
Likes: 217
From: Northern VA
Are you positive its not u-joints or too high idle speed?
maybe balancing weights fell off driveshaft? Bent driveshaft?
I’ve had some serious clunks tamed by turning down idle from 1000 to 500-600 RPM.
how did you calculate gearing? I have it on supposedly good authority that turning the wheels and counting shaft rotation doesn’t actually work.
did you count gear teeth?
maybe balancing weights fell off driveshaft? Bent driveshaft?
I’ve had some serious clunks tamed by turning down idle from 1000 to 500-600 RPM.
how did you calculate gearing? I have it on supposedly good authority that turning the wheels and counting shaft rotation doesn’t actually work.
did you count gear teeth?
Moderator
Joined: Jan 2001
Posts: 56,984
Likes: 2,738
From: Virginia
Are you positive its not u-joints or too high idle speed?
maybe balancing weights fell off driveshaft? Bent driveshaft?
I’ve had some serious clunks tamed by turning down idle from 1000 to 500-600 RPM.
how did you calculate gearing? I have it on supposedly good authority that turning the wheels and counting shaft rotation doesn’t actually work.
did you count gear teeth?
maybe balancing weights fell off driveshaft? Bent driveshaft?
I’ve had some serious clunks tamed by turning down idle from 1000 to 500-600 RPM.
how did you calculate gearing? I have it on supposedly good authority that turning the wheels and counting shaft rotation doesn’t actually work.
did you count gear teeth?
Thread Starter
|
Cargo Master
Joined: Jan 2019
Posts: 3,369
Likes: 16
From: Caraway, AR
I can't be positive it's not those things, but it definitely feels like its in the rear end, and it occurs downshifting at WOT so that's more than just too high of an idle I think. And I used a calculator to determine rear gearing.
Thread
Thread Starter
Forum
Replies
Last Post
Chris Ellis
1987 - 1996 F150 & Larger F-Series Trucks
2
Mar 7, 2016 09:05 AM
Pittsburgh-05HD
1997 - 2006 Expedition & Navigator
4
Nov 22, 2005 07:08 PM