Andrew Wood Posted April 23, 2021 Report Share Posted April 23, 2021 I am on 37" tires now and have not changed my gear ratio in my ring and pinion since I upgraded to 33" tires. I am running 4.11 gears now. I am considering using 4.37 or 4.75 Ashcroft gears. Thanks for any advice!Andrew. RobertDingli and lutz 2 Link to comment Share on other sites More sharing options...
lutz Posted April 23, 2021 Report Share Posted April 23, 2021 (edited) If its on road i would be tempted to do a 1.4 transferase gears but if she's struggling on the rocks diff gears are the way. Ashcroft has a ratio calc that helps https://www.ashcroft-transmissions.co.uk/calc/ratio_calc.html Looks like 4.37 would be about the same as it was on 35's and 4.11. I ran 4.11 on 33's so that would be about the same as 37;s on 4.75. Back in the day 4.75 used to be weaker but not sure if thats still true. Maybe ask Ashcroft. Edited April 23, 2021 by lutz PaulD, RobertDingli, lutz and 1 other 4 Link to comment Share on other sites More sharing options...
Andrew Wood Posted April 23, 2021 Author Report Share Posted April 23, 2021 I will give Ashcroft a call. Thanks. Link to comment Share on other sites More sharing options...
RobertDingli Posted April 27, 2021 Report Share Posted April 27, 2021 If you are really keen, you could consider changing the diff gears to a much shorter (numerically higher) ratio and then the TF high ratio to a taller (numerically lower) ratio. This would produce a greater spread of ratios between the high and low ranges, improving the crawling ability. I was planning to use 4.73 diff ratio and then change the high range gears to ~1:1 ratio. This would have provided similar effective high range ratios as stock (for my 35s) but improved low range crawling ratio Unfortunately, GBR delivered 4.11 gears and so I decided to live with these rather than wait a potential eternity for another set. My transfer case has remained stock. I have found the performance with 4.11 gears to be fine both on and off road for my 35s. Andrew Wood 1 Link to comment Share on other sites More sharing options...
Andrew Wood Posted April 28, 2021 Author Report Share Posted April 28, 2021 I would prefer to change the gears in the transfer case over the ring and pinion, but I don't know where to have that done or who would sell the correct gears for my rig.I am leaning towards the 4.37 ring and pinion considering that I want to keep it a strong setup. Link to comment Share on other sites More sharing options...
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