zekethomas Posted November 30, 2011 Share Posted November 30, 2011 I recently purchased a 1984 dolphin. It has a late 70s model Buick 231 V6 and trans. As a consiquence the gear ratio is way off (no overdrive on the trans). I'm reving way high at cruising speed. My options seem to be, Quote Link to comment Share on other sites More sharing options...
tumolt Posted November 30, 2011 Share Posted November 30, 2011 http://www.4x4wire.com/toyota/faq/parts/ and scroll down to view engine specs, rear ends, and trannys. Add this site to your favorites. Quote Link to comment Share on other sites More sharing options...
twoblocked Posted November 30, 2011 Share Posted November 30, 2011 I'm thinking the easiest fix would be to replace the third member (also called the rear differential) with a different ratio. (i.e. 4.10 to maybe a 3.42?) This would make your engine turn slower at the same MPH. First, determine what your ratio is now: http://www.brian894x4.com/Gearratiosanddiffs.html Don't rely on the Gear Code solely, the previous owner may have changed it. This site might help determine what you have: http://home.4x4wire.com/erik/diffs/#types Second, enter the ratio and transmission type into this gear ratio calculator: http://www.grimmjeeper.com/gears.html In the second column you can input a different ratio to see how your existing gears compare with a new one. You'll need more research to determine what ratios are available for your rig. Replacing a third member is fairly straightforward. I recently purchased a 1984 dolphin. It has a late 70s model Buick 231 V6 and trans. As a consiquence the gear ratio is way off (no overdrive on the trans). I'm reving way high at cruising speed. My options seem to be, Quote Link to comment Share on other sites More sharing options...
Derek up North Posted November 30, 2011 Share Posted November 30, 2011 If it hasn't been changed, it's probably a 4.10:1. But a previous owner enterprising enough to swap in a Buick engine might have already tried changing it. I think that it was only 'homes on '70s Toyotas that were 3.90:1. The Buick tranny without O/D will have a 1:1 ratio (less converter slip if it's not a lock-up type). Do you have a tach installed? What kind of engine speeds are you seeing and how fast are you driving? Is it possible your transmission isn't shifting into 3rd? I'm sure I'm not alone in wanting to hear more about the swap. Quote Link to comment Share on other sites More sharing options...
McShank Posted November 30, 2011 Share Posted November 30, 2011 Zeke, I would love to know more about your conversion as I have been planning my swap of a later model Buick into my Sunrader for awhile. Pictures would be terrific. Stock exhause manifold? Do you know what radiator you have? Also interested in mileage, cruising rpm. Have you considered changing your trans to a 700R or 4L60E with overdrive? Seamus McShank Quote Link to comment Share on other sites More sharing options...
Derek up North Posted November 30, 2011 Share Posted November 30, 2011 Maybe useful info for you to have: To get answers from a gear calculator, you might also need the TOYOTA transmission ratios. A340 (as used with the 3ZVE V6): 1st: 2.804 2nd: 1.531 3rd: 1.000 4th: 0.705 A43D (as used with the 22RE 4 cylinder): 1st: 2.452 2nd: 1.452 3rd: 1.000 4th: 0.688 http://personal.utulsa.edu/~nathan-buchanan/93fsm/autotrans/13descript.pdf http://personal.utulsa.edu/~nathan-buchanan/93fsm/autotrans/1descript.pdf Most places indicate that the lack of a profile number (60, 70, etc) has an aspect ratio between 80 and 85. Some specify 82% http://www.yokohamat..._sizing_system/ Sorry, I have no guess as to the ratios in your Buick 'box. Quote Link to comment Share on other sites More sharing options...
Derek up North Posted November 30, 2011 Share Posted November 30, 2011 http://www.4x4wire.c...yota/faq/parts/ and scroll down to view engine specs, rear ends, and trannys. Add this site to your favorites. I see no mention of the A43D, as used behind the 22RE. Non-locking torque converter which, reportedly, causes transmission problems due to heat build-up. Quote Link to comment Share on other sites More sharing options...
WME Posted November 30, 2011 Share Posted November 30, 2011 Change the axle ratio, go to bigger tires, change the trannie to a GM O/D unit (Turbo 200R4). Choice is up to your pocket book Quote Link to comment Share on other sites More sharing options...
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