Changing Gears Yourself
Guest
Joined: Nov 2004
Posts: 7,988
Likes: 55
From: north west new jersey
crush sleve
Originally Posted by bogginf350
have fun crushing the crush sleeve on that 10.5.. it was the worst part on my whole swap.. 
Thread Starter
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Laughing Gas
Joined: Oct 2003
Posts: 1,082
Likes: 93
From: VA/NH
Time to reach down, grab a pair and see how big my &@!!$ are I guess... I think it sounds like 4.10s will do what I need, but I'm kind of worried they're not much lower than 3.73s. I don't want to wind up like some guys and regret I didn't go lower. I'll have to find one of those programs that tell you what your RPMs are with certain gears. I think if I have someone looking over my shoulder that knows what they're doing I'll be alright. Now to find some good gears that I don't have to take a loan out to buy! I think I'm going to have to put the 05 plan off for now and give this a shot.
Senior User
Joined: Jan 2004
Posts: 174
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From: Illinois
I swapped 4.56 yukon gears into mine, It was a relatively easy swap. Front was naturally more difficult than the rear. But the rear on mine didnt even need to remove the bearings from the trac loc. Just a ring gear swap on the carrier after I had the pinion set at the proper depth. backlash was perfect if i remeber right about .011" and had a good pattern. And I would reccomend either saving your old syn oil and using it for the break in. Or breaking it in with 80w90.. Because its kinda goofy to put 60 dollars worth of 75w140 synthetic in it just to drain it 500 to 100 miles later. Some people dont change their break in oil but it is something I highly reccomend. Also you can check your wear pattern while the cover is off. Ohh. Captchas My IR 3/4 drive made easy work of getting the crush sleeve close beofre the final torque. I didnt want the chew marks all over the yoke that a pipe wrench will give you. Once the sleeve starts to go it is much easier than the initail smash. And dave, give randys ring and pinion a call or go to their website. www.randysringandpinion.com they have gear ratio calculators that can tell you your highway rpm. If you are not going over a 33 inch tire stick with a 4.10. Many people think stump pullin gears are good... They are more like gas pumpin gears tho...
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Laughing Gas
Joined: Oct 2003
Posts: 1,082
Likes: 93
From: VA/NH
That site was exactly what I was looking for boggin, thanks! I'll bet you gearing is the only problem some of us are having with the 5.4. According to that site, they recommend between 1800 - 2800 rpms at 60mph. I calculated these ratios 3.73, 4.10 and 4.30 and here is what I got:
4.30 33" 60mph 1,839 rpms
4.10 33" 60mph 1,753 rpms
3.73 33" 60mph 1,595 rpms (can you say lugging?!?!)
Real world. Same set up at 75mph:
4.30 2,299
4.10 2,192
3.73 1,994
The problem with hills makes complete sense now. 2,000 rpms is obviously too low for a gas engine and that weight. I'll bet with a gear swap, you'll actually save fuel by the transmission not shifting so much and the engine not having to work so hard.
4.30 33" 60mph 1,839 rpms
4.10 33" 60mph 1,753 rpms
3.73 33" 60mph 1,595 rpms (can you say lugging?!?!)
Real world. Same set up at 75mph:
4.30 2,299
4.10 2,192
3.73 1,994
The problem with hills makes complete sense now. 2,000 rpms is obviously too low for a gas engine and that weight. I'll bet with a gear swap, you'll actually save fuel by the transmission not shifting so much and the engine not having to work so hard.
Senior User
Joined: Jan 2004
Posts: 174
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From: Illinois
My buddy has a 01 f250 ext cab 5.4 4x4. He opted for the 4.10`s which I think came with the off road package. he is running a 33 bfg mt and doesnt seem to have any problems. My truck, a 03 6.0 i swapped to the 4.56 because of the 38inch tires. But also a diesel is much more suited for the lower rpms. Its going to be a personal decision on your part between the 4.10 and the 4.30. But I prefer a motor that is not laboring to do 70 mph I would rather it turn 500 more rpms and not labor or kick down and wear on the tranny.
Guest
Joined: Nov 2004
Posts: 7,988
Likes: 55
From: north west new jersey
bogginf350
yes a air gun makes it easier to start a crush sleeve moving. you are correct, i was thinking dose this man have a compresser or not , i've had to do a ton of gear swaps while at the drag strip without the aid of air .so its just something to use and keep in mind when you don't have some thing to make the job a bit easier. the plumbers pipe wrench i use has the smooth straight jaws again its a i can use to help out, inch pound and foot pound torqe wrenches are a most have thou as is a dail indicator set.
one other thing i do is keep the backlash tight.never had a set of whining 10's yet. good post man
one other thing i do is keep the backlash tight.never had a set of whining 10's yet. good post man
