5.29s + 35s + 3F-E = Sweet!

[motorsargeT]

Installed the gears in the beast on Monday and have been driving it since then. Let me say this. If you have a 3F-e powered 80 and want to run 35s this is the way to go. At 70 mph it is only turning 2500-2600 rpm. It no longer has to downshift on the highway on minor hills. Around town it has much more pep and drives so much nicer than it ever has. My father-in law bought the truck new and even he says it has never had this much power.

Unfortuanately I will not be able to do much more for about a week because a horrible vibration has reared it's ugly head at higher speeds. Now that the transfer case is turning at higher speeds It is producing a bad vibe. After digging around I found that the rear output of the transfer has about 1/8 of an inch of play in it. bearing will be here next week.


Pic of the 80 with the mutts after the install.

 

[shromani]

Nice colors, sits wonderful, very handsome... Your rig look good too

 

[BenMara]

Nice asome oh yea i miss my dobi RIP nog-nog

 

[motorsargeT]

Thanks for the comments about the dogs. I just finished burning off the first tank of fuel. Unless my math is off I got 16 mpg (corrected) from that tank. I know I was being easy with breaking in the gears but that is a huge improvement over the 10 I was getting before.

 

[southff4]

Nice ride, how much were the gears and where did you get them.

 

[shromani]

With the price of gas, those gear will pay for themselves very shortly. It's great when a mod pays you back.

 

[Flip Dog]

Awesome, thats my plan as well! Im glad to here your positive outcome.

 

[Land Speeder]

How was the grinding to get them in the rear semi-float axle? I've heard it sucks.

 

[motorsargeT]

the grinding is ugly. If I had thought of it I would have taken pics. I still have to install my aussie locker at some point so when the diff cover is off again I can snap a few.

 

[AMMO]

Installed the gears in the beast on Monday and have been driving it since then. Let me say this. If you have a 3F-e powered 80 and want to run 35s this is the way to go. At 70 mph it is only turning 2500-2600 rpm.

Just an FYI you are not really going 70 MPH unless you corrected that speedo? I have 5.29's and 37's and on a recent trip found out that my 80MPH and 3G's on the tac is really 70MPH thanks to some of the radar speed signs on US 1. Meaning if I'm under, you would really be under with 35's.

-Ammo

 

[Tennessee80]

Now that we are on the subject, why did you go with 5.29 vs. 4.88's? I am a bit confused on what each provides as far as an end result on power/RPM, etc... Do you think that 4.88's would have produced too much out of the power band? Nice rig, BTW...

Joel

 

[teejnut]

What kind of grinding do you have to do on the semi-float? For 4.88's do you have to do grinding as well?

 

[motorsargeT]

Just an FYI you are not really going 70 MPH unless you corrected that speedo? I have 5.29's and 37's and on a recent trip found out that my 80MPH and 3G's on the tac is really 70MPH thanks to some of the radar speed signs on US 1. Meaning if I'm under, you would really be under with 35's.

-Ammo

I was not using the speedo for my reading but my wife in my WRX driving 70 mph next to me. speedo was actually reading 80ish. also checked with my gps for speed. you also have a a442f which i have heard has a different overdrive ratio than my a440f which would also change rpm vs. speed

 

[motorsargeT]

Now that we are on the subject, why did you go with 5.29 vs. 4.88's? I am a bit confused on what each provides as far as an end result on power/RPM, etc... Do you think that 4.88's would have produced too much out of the power band? Nice rig, BTW...

Joel

I went 5.29 because that is the lowest I could go. I thought about 4.88s for a while and then decided that if my highway rpm was too far off with the 5.29s then oh well I'll have to get 37s!Also after doing numerous speed vs gear vs tire size blah, blah, blah it seemed the rpm range would be right where my motor makes power and would not have to drop out of overdrive to be on the highway. My engine was built by me with a few choice components and attention to detail and it ended up making really good torque from 2000 on up and horsepower also. Mind you it is still nowhere near a 1fz-fe in power but it definately holds its own and will now idle over certain rocks at my mothers farm that I had to romp on it before to get over.

 

[Cruiser Jimmy]

you should be getting some better mpg output as a result of the 5.29's.

 

[motorsargeT]

What kind of grinding do you have to do on the semi-float? For 4.88's do you have to do grinding as well?

you have to grind teeth down on the ring gear to be able to reinstall the center pin in the differential. 5.29s need a lot of grinding to make the clearance. you also need to grind 4.88s, just not as much.

you should be getting some better mpg output as a result of the 5.29's.

My truck has never gotten good mileage since the engine rebuild. The compression was bumped up a fair amount and I also dialed in a lot of timing advance to make better power. with those factors I had to get it to add more fuel beyond what the factory correction allowed. needless to say I ghetto-fabbed up a cheesy way to get the cold start injector to fire as a temporary fix and it has been 3 years now. Also that was a lot of back roads and only 1 highway run to see what she was turning at 70. If I didn't correct for the odometer difference I would have gotten 21 mpg!

 

[therealratfink]

Yep, it's awesome isn't it. I wish we could correct the speedo though.

 

[teejnut]

you have to grind teeth down on the ring gear to be able to reinstall the center pin in the differential. 5.29s need a lot of grinding to make the clearance. you also need to grind 4.88s, just not as much.

Didn't now that! I'll wait for your pics when you put the aussie in. I plan on going 5.29s with 35s in the future... probably distant future though.

 

[Letsgomoreplaces]

grinding for xpin

Grinding for the crosspin is only on c/clip rear as the case w/ fj80. Not applicable to fullfloat fzj80. This type of grinding is commonplace with installs of low gear ratios in many c-clip rearends. I have done this numerous times, and have sold hundreds of gears that have been ground for x/pin and have yet to see one fail if ground properly.

here is a more extreme case, a pic of a LC 5.29 gear that has been clearenced for removal/install of a detroit locker (the centerblock is larger than std x/pin) This was done nearly 10 years ago and still in use!
The other pic is of where you would grind for a std dia. x/pin

How was the grinding to get them in the rear semi-float axle? I've heard it sucks.

 

[denicks]

Nice cruiser. Now you need to put some body damage on it.