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RPR

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RPR last won the day on July 31

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About RPR

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    Old Hand

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  • Location
    Front Range - Colorado

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  • Interests
    Golf, offroading, skiing, shooting, and yattering with this mob...

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  1. Based on the numbers run in the Ashcroft calculator, with the 1.03 HR LT230, there should be no need for an Overdrive.
  2. Thanks very much!! Wish I'd known about the Ashcroft calculator first; that thing is fabulous. Luckily, I have a line on an LT230 with the 1.003 gears in it, and that is definitely what I want. That will make high range much more pleasant and means I don't need another Overdrive. First low crawl goes from from 64:1 to 73:1, which borders on silly slow. Mind you, loss of the Overdrive as a gear splitter will hurt. It was nice having 64:1 or 46:1 First low. I had been toying with 1100x16 tyres, but I think I'll stick with the little old Swampers.
  3. Sadly, after 20 years, 12 of which were behind the 3.5/3.9 V8 in my Series III, the Series transmission has given up the ghost. Multiple gear and shaft breaks, lots of metal shards. Would require a complete rebuild or new reconditioned box and, for the money, may as well go R380 and LT230. My Volvo portal axles are CV front joints, so full time 4WD is fine. I'm trying to figure out gear ratios and need some serious rivet counting and math help please. Currently: 5.99 axle (diff and reduction boxes), 1.15 t-case high range, Roamerdrive OD (x 0.28) and 35.5" tires, for: 4th OD: 4.59:1total ratio or 0.828 transmission ratio ; 60 mph @ 2823 rpm 3rd OD: 7.44:1 ; 30 mph @ 2112 rpm With early RRC LT230 that I understand to be 1.03:1 high range. Question 1, is that the correct ratio? 5.99, 1.03, Suffix J R380 (5th 0.73:1 and 3rd 1.39:1), 35.5" tires for: 5th: 4.50:1 ratio or .0.752 transmission ratio ; 60 mph @ 2558 rpm 3rd: 8.57:1 ratio and 1.432 transmission ratio ; 30 mph @ 2436 rpm With later V8 LT230 1.22:1 High range (is that correct ratio?) 5th: 5.33:1 ratio 0.891 transmission ratio ; 60 mph @ 3031 rpm 3rd 10.16:1 ratio or 1.695 transmission ratio for 30 mph @ 2883 rpm So, the Tonka is not a daily driver, nor does it do highway miles, but on the county roads, it needs to do 60 - 65 mph. With the 1.22:1 high range LT230 that's 3000 - 3200 rpm. That seems pretty high rpms; higher than 4th OD with the Series box. Whereas with the early RRC ratio of 1.03:1 High Range, 5th gear is delivering 60 - 65 mph at 2558 - 2771 rpm. That's super comfortable. Fourth gear would be 40 - 50 mph at 2300 - 2900 rpm. It really seems that that 1.03:1 High Range ratio is perfect. So, questions: Have I got the ratios right in the LT230 and gears right in the J Suffix V8 R380? Have I got the math right (using this rpm calculator: https://www.crawlpedia.com/rpm_gear_calculator.htm ) Am I missing something? Appreciate your help on this. Thanks very much.
  4. Is this the 14CUX system or a later Bosch or GEMS? If it’s 14CUX, the only sensor is MAF, so pull it and clean it. If it’s not that, it’s probably injectors. Do you run an injector cleaner through the tank from time to time? If it’s GEMS or Bosch, I’m of even less use, but the Throttle Position Sensor and Vehicle Speed Sensor would be candidates, as would gunky or faulty injectors.
  5. Super Swampers in Q78/16 (36x11) Just sayin' 😝
  6. I have RRC cast iron manifolds on my SIII 3.5/3.9 hybrid. I treated them with some ceramic coating that I had to get a special permission or exemption from the EPA because it's like a mixture of Roundup and Plutonium or something, but it did marginally diminish heat in the engine bay, a constant problem. I also have a big marine extractor fan in the passenger (RH on mine) wheel arch. It's still like the boiler room on the SS Hades in there...
  7. I have an SIII with a 3.5/3.9 hybrid and parabolics and extended shackles. On portals. As per the advice given above. First, bump it around a field quite a bit. They will definitely settle a little bit. Second,also as noted above, there are such things as "degree wedges", steel wedges that fit at the spring perch to angle the pinion nose slightly up to correct for the lift. I had some years ago but cannot for the life of me recall from where I got them, sorry. Finally, years ago when I was an early guinea pig for Nigel's "Gone2Far" suspension set up, I had a narrow diameter wide yolk prop shaft made in the UK by a place that was then called (but may have changed name?) "The Propshaft Clinic". It was very well made and is still on my rig. This allows you to avoid scalloping the crossmember. Hope this is helpful.
  8. Next day, Ophir Pass, a piddling 12,000 ft. And down into Telluride before heading home on Last Dollar:
  9. Imogene Pass, 13,000 feet. Felt like I was down to about 10 BHP! Very poor cooling at altitude and my oil pressure gage dropped through the floor above 11,000 ft and back up as we descended. It was nippy at the top.
  10. Every year, my local club, The Solihull Society, organizes the “National Rally”. Big year in Moab, off-year in Colorado somewhere. This year was Ouray-Telluride in the San Juan Mountains. I only made it for Thursday-Saturday and lost the Thursday having to repair the passenger side windscreen. Something went through it on the highway while it was on the trailer. Weird. Interesting that it was tempered glass. Do we think that was a cost savings for export models to third world markets or that Farmer Abdul used tempered rather than laminated to replace at some point? Did Imogene Pass on Friday. 13,000 ft and it was the first day open as the county had only bulldozed the 10 foot snow drifts at the top the day before. Telluride side was closed with a 300 yard section just shy of the top wiped out by avalanche and landslide. They’ll spend the rest of the year rebuilding it - just in time for Winter closure 😉 Did Ophir Pass, a mere 12,000 feet, Saturday, down to Telluride for lunch, then Last Dollar road and Pass back to Ridgway and Ouray.
  11. So, the reset wasn’t a long term solution. I replaced the stepper motor and gave the housing a good cleaning. After thrashing the carp out of it at the LR National Rally this weekend, it has settled down at 700 rpm. Getting up Imogene Pass to 13,000 feet was a thrash! The county had opened the Ouray side, plowing through some 10ft drifts earlier in the week. But the Telluride side wasn’t open because a 300 yard section just shy of the top was wiped out by avalanche! The first pics are of Ophir Pass, a mere 12,000 ft, the last one is Imogene at 13,000.
  12. Doubtful. The speedo hasn't been connected to anything for at least 12 years...
  13. Seems better 😎 Thanks for the advice.
  14. Will reset ce soir and report back.
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