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91 FJ80 Build
- Thread starter Chkn
- Start date
Will Scarlet
The universe is vast...
- Joined
- May 20, 2020
- Member Number
- 766
- Messages
- 1,661
It may be an optical illusion, but it looks like the shaft for the alternator is wobbling.
I didn’t notice earlier but I think you’re right. It’s a brand new alternator from summit. I’ll look at it closer and see what’s happening.
YotaAtieToo
Thick skull
Nice, I'm totally into the 6 speed auto over the 4speed. I didn't even realize there was a Gen 4 4.8, I may steal your idea 
You may have mentioned it, but what's your tcase set up as far as high and low range gears?
I'd like to put an lt230 behind a 6l80e as I think it would be perfect ratios.
You may have mentioned it, but what's your tcase set up as far as high and low range gears?
I'd like to put an lt230 behind a 6l80e as I think it would be perfect ratios.
I'm using the factory FJ80 transfer case. Low range is 2.49:1 and High range is 1:1.Nice, I'm totally into the 6 speed auto over the 4speed. I didn't even realize there was a Gen 4 4.8, I may steal your idea
You may have mentioned it, but what's your tcase set up as far as high and low range gears?
I'd like to put an lt230 behind a 6l80e as I think it would be perfect ratios.
YotaAtieToo
Thick skull
Gotcha, with the 4:1 1st it will probably be pretty good for most situations.
The 80 cases are interesting with the 1.1:1 high gears as an option.
The 80 series case has some options. 1.1:1 high range as well as a 3:1 low. So you can get better overdrive and better crawl gears in one unit.
YotaAtieToo
Thick skull
Math is hard
😂. I was thinking these gears for better overdrive, not the 1.1:1.
Sumo Gear Land Cruiser Transfer Case 10% Overdrive Gear Set - Fits 8x/100 Series
Low Range Gear Reduction Sets for Toyota Land Cruiser Applications
cruiserteq.com
Now that I think of it. It’s probably a 1:1.1 gearset. 🤣
YotaAtieToo
Thick skull
Math is hard
Sumo Gear Land Cruiser Transfer Case 10% Overdrive Gear Set - Fits 8x/100 Series
Low Range Gear Reduction Sets for Toyota Land Cruiser Applications
Now that I think of it. It’s probably a 1:1.1 gearset. 🤣
No you're right, those are 10% overdrive I had no idea those existed.
tsomctl
Well-known member
- Joined
- Jul 25, 2023
- Member Number
- 6644
- Messages
- 79
They're also out of stock.No you're right, those are 10% overdrive I had no idea those existed.
We drive Toyotas. We’re used to that. 🤣
Rugger99
Active member
- Joined
- Dec 4, 2020
- Member Number
- 3110
- Messages
- 29
Especially Those of us with 1991 FJ 80's..." types in Toyota part number....NLA "
Last edited:
It feels like every damn part is NLA. 🤣 Get pretty good at Jerry rigging newer parts to fit the older applicationsEspecially Those of us with 1991 FJ 80's..." types in Toyota part number....NLA "
Rugger99
Active member
- Joined
- Dec 4, 2020
- Member Number
- 3110
- Messages
- 29
I have had good luck with Partsouq.com
YotaAtieToo
Thick skull
Any idea what the wieght difference between the stock engine and trans and the new stuff?
Is the 4.8 aluminum or iron block?
Is the 4.8 aluminum or iron block?
Iron block 4.8l
The front end looks lighter with the 4.8l/6l80 vs the 3FE/A440 combo. I didn't weigh them but I wish I had.
Google fu shows the following: (But I don't know about the A440 weight that transmission is massive compared to the 6L80.)
3FE weighs ~650lbs and the A440 weighs ~215ilbs dry for a total of ~865lbs
4.8l weighs ~580lbs and the 6L80 weighs ~195lbs dry for a total of ~775lbs
So its a little lighter.
YotaAtieToo
Thick skull
I figured I'd would be a bit lighter, just wasn't sure how the trans compared.
I need to air up the tires to a more road worthy pressure. I think the Autozone power steering pump is dead, because it intermittently works. I need to plumb the crankcase vent on the passenger valve cover to the intake because currently it’s an unmetered air leak that whistles 🤣. Need to order fittings to get the AC connected. Also need to adjust the throw of the shift lever because it’s nowhere near where it needs to be. But it was a successful first ride and it didn’t explode so that’s good. 
Did some more work to it. Was driving it off and on to the store or on errands. All within 5 miles of the house or so and it was working good. I was dragging my feet on the alternator replacement just because I was lazy. Noticed that the voltage was dropping significantly under load during acceleration. Contacted Summit and had them send a replacement alternator. That one arrived in the shipping box in worse shape than the alternator installed on the truck. So I went to Napa and bought a Denso reman. Voila, perfect voltage and guess what? The power steering pump I thought that was crapping out was actually the crummy Summit alternator intermittently seizing
Bonus from buying a non crappy product.Drove it around town some more and everything was good.
After Hurricane Helene my church group volunteered to help with some hurricane clean up about 4 hours south. Decided to throw the front end on the truck the day before and drive it down. What could go wrong? 250ish miles and not properly tuned. I figured I drove my ole 22r with a terribly tuned carburetor for years with no ill effects so the legendary 4.8l should have no problems. Well I was right, it ran great and is going to get tuned this Friday so it will run better.
My gas pedal bracket was not so lucky. I was playing around with making it more ergonomically friendly and left one of the 3d printed prototypes in. Turns out 40 minutes is all the PLA could take
Had to turn around and drive home to grab the non ergonomic ABS bracket then drive back again. Worked for the 4 hours down, the day and a half puttering around and the 4 hours back up. Just need to print an ABS version of the more ergonomic bracket.Still haven’t wired in the PNP switch so no reverse lights and no gear indicator lights on the combo meter