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08-13-2020, 10:24 AM | #41 |
Quarry Creeper Join Date: Oct 2012 Location: Oxford
Posts: 248
| Re: Topher Builds a Sherpa - Rear Portal Class 2 comp truck
Man, another great looking build!.
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08-13-2020, 12:43 PM | #42 | |
Rock Crawler Join Date: Jul 2016 Location: Southern Oregon
Posts: 767
| Re: Topher Builds a Sherpa - Rear Portal Class 2 comp truck Quote:
(Sorry for the brief thread hijack) Sent from my SM-G970U using Tapatalk | |
08-13-2020, 05:20 PM | #43 | |
Go Buckeyes! Join Date: Jun 2017 Location: Mid-Ohio
Posts: 4,121
| Re: Topher Builds a Sherpa - Rear Portal Class 2 comp truck Quote:
Same here on the wood bed. I've had ideas and seen some really nice wood beds on FB, but have yet to make one. I think I may try to make one on my next build this winter. A bed made out of scale diamond plate would look killer with the PW body and the paint you chose. | |
08-13-2020, 05:47 PM | #44 |
Rock Crawler Join Date: Jul 2016 Location: Southern Oregon
Posts: 767
| Re: Topher Builds a Sherpa - Rear Portal Class 2 comp truck
Topher, I can't do diamond plate, but I could probably make you an aluminum bed fairly easy. This is a trailer I'm in the process of building, but im sure the design could be adapted for a flatbed pretty easy... Sent from my SM-G970U using Tapatalk |
08-14-2020, 01:20 AM | #45 |
Newbie Join Date: Jun 2020 Location: Norway
Posts: 45
| Re: Topher Builds a Sherpa - Rear Portal Class 2 comp truck
My first post here goes to you, what an awesome looking rig! Also have a Sherpa kit on the way, and your build made me want to go portal in the rear... I see you have used SSD axle housing in other builds also, do you buy them finish built or piece them together yourself? What are your opinion on Diamod Pro vs Pro44? Other than scale looks. |
08-14-2020, 08:01 AM | #46 | ||||
Gold Star Baby! Join Date: Dec 2017 Location: Las Vegas
Posts: 2,554
| Re: Topher Builds a Sherpa - Rear Portal Class 2 comp truck Thanks Stimpy! Quote:
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I went with the diamond here so I could make sure the reverse cut ring and pinion gears can go on either side to get the axle rotation the same as the rear portal axle. They were pieced together but I do use the ssd universals. | ||||
08-14-2020, 12:14 PM | #47 |
Gold Star Baby! Join Date: Dec 2017 Location: Las Vegas
Posts: 2,554
| Re: Topher Builds a Sherpa - Rear Portal Class 2 comp truck
So through my guessing I had thought I’d be around 30% overdrive. This was a rough estimate by taking the 1.91 portal reduction stock and just subtracting the amount of OD I was adding with each piece. So 30% from the t case, 10% from the ring and pinion, and another 30-35% from the portal gears (not sure the exact ratio of the tgh wild). *edit, the t case is actually 15% not 30% Decided to record it with the rear tire turning 10 times and seeing how many times the front turned. I end up right around 11.5 turns in front and 10 in rear which seems to be about a 15% overdrive? Last edited by Topher Builds; 08-17-2020 at 01:39 PM. |
08-17-2020, 01:38 PM | #48 |
Gold Star Baby! Join Date: Dec 2017 Location: Las Vegas
Posts: 2,554
| Re: Topher Builds a Sherpa - Rear Portal Class 2 comp truck
Decided to trim the cab a little bit to take out some of the lean. Also got some diff portal gears coming to reduce the amount of overdrive in the rear and give me more overdrive up front. Hoping to get around 25-30% with this next change. |
08-18-2020, 06:57 AM | #49 |
Go Buckeyes! Join Date: Jun 2017 Location: Mid-Ohio
Posts: 4,121
| Re: Topher Builds a Sherpa - Rear Portal Class 2 comp truck
I think it looks good now with the cab sitting more level! |
08-18-2020, 08:47 AM | #50 | |
Newbie Join Date: Oct 2019 Location: W. Hartford
Posts: 39
| Re: Topher Builds a Sherpa - Rear Portal Class 2 comp truck Quote:
front output = 1.0 front ring/pinion = 30/8 = 3.75 rear output = 1.0 / 1.15 (t-case OD - division because you're speeding up the rear, thus reducing the amount of reduction) rear ring/pinion = 27/8 = 3.375 (OD ring/pinion) rear portal = 20/15 = 1.333 (Wild TGH OD gears) I get: front reduction = 3.75 rear reduction = (1/1.15) * 3.375 * 1.333 = 3.91 This gives ~4.2% OD (using either (r-f)/r or Harley's average (r-f)/((r+f)/2) ) | |
08-18-2020, 09:08 AM | #51 |
Gold Star Baby! Join Date: Dec 2017 Location: Las Vegas
Posts: 2,554
| Re: Topher Builds a Sherpa - Rear Portal Class 2 comp truck
^ like. And that’s exactly why I gave up on the math of calculating ratios and have gone to a more rudimentary empirical method of just counting turns. Thanks for going through all the math, I never sat down to work it out, just started building. The mild portal overdrive gears showed up yesterday so I’ll have those in this week sometime and will run a similar video to see where it ends up. But to play with your math, if you multiply to get 1.15 instead of dividing then you get 7.9%. As we see though, the actual rate multiplied and doesn’t divide by 2 and we end up right under 16%. (5.175-3.75)/(5.175 + 3.75) = 1.425/8.925 = 15.9% Thanks B! I like it better more level as well, should have done it from the get go really. |
08-18-2020, 09:22 AM | #52 |
Newbie Join Date: Oct 2019 Location: W. Hartford
Posts: 39
| Re: Topher Builds a Sherpa - Rear Portal Class 2 comp truck
Yeah, I've never actually checked the maths vs. reality on OD, just used the numbers to show me roughly where I am and foolishly trusted them I've also been considering something similar with both a gamechanger 4.2 and vs4-10 + VFD, so I happened to have a few spreadsheets with everything worked out |
08-18-2020, 09:30 AM | #53 |
Newbie Join Date: Oct 2019 Location: W. Hartford
Posts: 39
| Re: Topher Builds a Sherpa - Rear Portal Class 2 comp truck
And interestingly, if I play with my maths, but with a standard 30/8 ring/pinion in the rear I get 14.8% OD..
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08-22-2020, 09:55 AM | #54 |
Gold Star Baby! Join Date: Dec 2017 Location: Las Vegas
Posts: 2,554
| Re: Topher Builds a Sherpa - Rear Portal Class 2 comp truck
Got the Sherpa out early today for a proper shakedown at my favorite spot out here. The truck did great, handled everything I threw at it including a couple lines that other rigs struggle with. Video coming soon. Very happy so far, I didn’t change any gearing yet because I wanted to see how it did with the initial set up and the observed 15% OD. I’ll change the portal gears this week which should get it between 25-30%. Quick clip... Last edited by Topher Builds; 08-22-2020 at 10:42 AM. |
08-22-2020, 01:01 PM | #55 |
Gold Star Baby! Join Date: Dec 2017 Location: Las Vegas
Posts: 2,554
| Re: Topher Builds a Sherpa - Rear Portal Class 2 comp truck
Shakedown video is up |
08-22-2020, 01:19 PM | #56 |
Quarry Creeper Join Date: May 2017 Location: Devon
Posts: 442
| Re: Topher Builds a Sherpa - Rear Portal Class 2 comp truck
Everything about that was brilliant, top job. Particularly spectacular playground Thanks for sharing. Sent from my Pixel 3 using Tapatalk |
08-22-2020, 01:39 PM | #57 |
RCC Addict Join Date: Aug 2013 Location: Calgary - in the Great White North
Posts: 1,373
| Re: Topher Builds a Sherpa - Rear Portal Class 2 comp truck
Hey looks fantastic. Takes a sidehill really well. Nice build overall. All it needs now is a Fargo badge above the grill. 😎
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08-23-2020, 05:29 PM | #58 |
Newbie Join Date: Oct 2019 Location: Kalifornia
Posts: 29
| Re: Topher Builds a Sherpa - Rear Portal Class 2 comp truck
Amazing build - great job! |
08-24-2020, 07:20 AM | #59 |
Go Buckeyes! Join Date: Jun 2017 Location: Mid-Ohio
Posts: 4,121
| Re: Topher Builds a Sherpa - Rear Portal Class 2 comp truck I give the newest TB build 5 out of 5 thumbs! Great vid at a beautiful location! |
08-24-2020, 02:43 PM | #60 |
Gold Star Baby! Join Date: Dec 2017 Location: Las Vegas
Posts: 2,554
| Re: Topher Builds a Sherpa - Rear Portal Class 2 comp truck
Thanks everyone! Very much appreciated. If you follow me on social media you’ll surely tell I’m a big fan of this truck. On that note, here’s another clip from the video that I posted separately on the gram. I had originally planned on changing shocks down the road but I have to say I’m quite pleased with these incision shocks. I know they’re not the most well regarded shock for whatever reason (maybe the bladder?) but they’re working out great on here. Using a 70w oil, rebuilt them since I got em used, didn’t bother with green slime (I never do tbh) and they’re very smooth and haven’t lost a drop of oil after putting the rig through its paces. I’m happy with how it’s worked out having a 80mm shock on the rear portal and 90mm up front. Still has good reach. The optional springs worked out well too. Hopefully they continue to hold oil. Last edited by Topher Builds; 08-24-2020 at 02:56 PM. |
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