Builds Project Pikachu: 1977 FJ40 (2 Viewers)

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So, in the spirit of why we have these trucks, I just returned from a fantastic trip to Big Bend State Park on the U.S./Mexico border for some wheeling and camping with old friends in the new trail rig. In the crew are a '75 FJ40, a 76 FJ40, another '77 FJ40, a 1998 UZJ100 with factory lockers, and Pikachu of course. She ran beautifully.

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Man. How was the 40 on all the washboard roads? You guys go to Guale?
40s did great in the park. Those are some terrible roads down there though.

Yeah, we did Guale 2 on the first night. Excellent spot as you know.
 
Took Pikachu on its first real paved highway run today. I've got a little bit of rear driveline vibration/rumble right at 40 MPH, but other than that it did great. I'm thinking the rear driveshaft may need new u-joints? The noise goes away above 40. Thoughts?

Fun pic:

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I've got a little bit of rear driveline vibration/rumble right at 40 MPH, but other than that it did great. I'm thinking the rear driveshaft may need new u-joints? The noise goes away above 40. Thoughts?

Carson, what are the working angles like on both rear u-joints? What you describe is a pretty classic symptom of unequal working angles and/or to much angle for the u-joint even if they are equal. The more lift you have, the worse the working angles will be (without shims).
 
Carson, what are the working angles like on both rear u-joints? What you describe is a pretty classic symptom of unequal working angles and/or to much angle for the u-joint even if they are equal. The more lift you have, the worse the working angles will be (without shims).
Good question. Sounds like I need to do some studying on this subject.
 
After going to your whole thread i can say GREAT job..

I'm a 80 guy who will become a 80/40 guy soon and looking for ideas and help to the next project; you have nailed it!

Thank you for sharing!
 
I pulled the rear driveshaft and took the ole mutt on a nice long drive. There is no vibration or any other sounds when I'm running on the front driveshaft alone. So, it is definitely caster or the rear driveshaft is out of balance. I would think that the HFS 4" setup would account for the driveline angle change, and I haven't found any other references to issues with it while running this lift. What do you guys think?

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What an amazing job you have done! I feel the urge to "borrow" your design! Don't you have ,by any chance , a photo of the rollcage used as a base for the soft top?
Thanks. I think you may be referring to the bows that support the OEM-style soft top. Here is one picture that I took during the install. Hope this helps.

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I pulled the rear driveshaft and took the ole mutt on a nice long drive. There is no vibration or any other sounds when I'm running on the front driveshaft alone. So, it is definitely caster or the rear driveshaft is out of balance. I would think that the HFS 4" setup would account for the driveline angle change, and I haven't found any other references to issues with it while running this lift. What do you guys think?

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Put in a double cardan on the TC side and point the cardan up to the TC.
 
Here is a decent starting point for your reading pleasure:

Driveline 101

Thanks, Lee. After reading this, I immediately noticed that my rear diff was slightly angled upwards. And, it looks like we are about 4 degrees upwards. Is the solution to install 4 degree shims on the rear spring packs to make the flanges parallel? Where is the best place to buy them?

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Thanks, Lee. After reading this, I immediately noticed that my rear diff was slightly angled upwards. And, it looks like we are about 4 degrees upwards. Is the solution to install 4 degree shims on the rear spring packs to make the flanges parallel? Where is the best place to buy them?

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Contact @orangefj45 , Georg @ Valley Hybrids & Cruiser Brothers for some steel shims.
 

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