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Tech & Fab
4.70 t-case gears w/auto tranny?
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<blockquote data-quote="bigd9247" data-source="post: 1074937" data-attributes="member: 16841"><p>So my current setup is this: 4.3L V6, TH350 automatic tranny, single toyota 4cyl t-case, 4.10 differential gears. So far out on the trails the stock low-range gears in the t-case have worked just fine (since i have an automatic), but occasionally the truck will bog down and not be able to spin the tires very well... i'm assuming this is because of front/rear lockers and 4.10 differential gearing.</p><p></p><p>So now i'm debating whether or not i should get 4.70 t-case gears to get even lower gearing on the trail (thus more torque to the tires in low range). But i'm concerned that the 4.70 gears might be too low... and no i don't really want dual cases.</p><p></p><p>According to <a href="http://www.grimmjeeper.com" target="_blank">www.grimmjeeper.com</a>... my final drive ratios (in low) work out to these:</p><p></p><p>stock: 1st=23.56 2nd=14.21 3rd=9.35 (i run 1st on trails, 2nd or third between trails)</p><p></p><p>4.70 gears: 1st=48.56 2nd=29.29 3rd=19.27</p><p></p><p>so on less technical trails, it looks like 4.70 in 2nd is comparable to stock and 1st gear... but will my auto tranny have issues running around in second on less technical trails or will it operate just like it normally should (downshifting when it needs to and upshifting when it needs). i guess i'm concerned that my tranny is going to be constantly jumping back and forth between 2nd and 1st on less technical trails, where as now i just keep it in 1st the whole time.</p><p></p><p>opinions? (sorry for the long post)</p></blockquote><p></p>
[QUOTE="bigd9247, post: 1074937, member: 16841"] So my current setup is this: 4.3L V6, TH350 automatic tranny, single toyota 4cyl t-case, 4.10 differential gears. So far out on the trails the stock low-range gears in the t-case have worked just fine (since i have an automatic), but occasionally the truck will bog down and not be able to spin the tires very well... i'm assuming this is because of front/rear lockers and 4.10 differential gearing. So now i'm debating whether or not i should get 4.70 t-case gears to get even lower gearing on the trail (thus more torque to the tires in low range). But i'm concerned that the 4.70 gears might be too low... and no i don't really want dual cases. According to [url]www.grimmjeeper.com[/url]... my final drive ratios (in low) work out to these: stock: 1st=23.56 2nd=14.21 3rd=9.35 (i run 1st on trails, 2nd or third between trails) 4.70 gears: 1st=48.56 2nd=29.29 3rd=19.27 so on less technical trails, it looks like 4.70 in 2nd is comparable to stock and 1st gear... but will my auto tranny have issues running around in second on less technical trails or will it operate just like it normally should (downshifting when it needs to and upshifting when it needs). i guess i'm concerned that my tranny is going to be constantly jumping back and forth between 2nd and 1st on less technical trails, where as now i just keep it in 1st the whole time. opinions? (sorry for the long post) [/QUOTE]
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