DanDanLongDan Posted September 15, 2015 Share Posted September 15, 2015 Ask jdemeris for info. He knows everything. Quote Link to comment Share on other sites More sharing options...
Bob C Posted September 15, 2015 Share Posted September 15, 2015 I live in Wisconsin and the vehicles here rot out real fast. The probability of finding a used gear set and housing is almost zero. The scrappers only keep parts vehicles that they know they can turn multiple sales from, everything else goes to the crushers. I stopped at one of the bigger scrap yards and asked if they had any one ton Toy trucks and the guy laughed at me. He said that the last one he saw was 20 years ago, Maybe I can find a setup like that on fleabay. Your documentation of your project is great. If I can find the parts, I may do that swap also. I have a 22 Re with overdrive auto tranny. I think that with the 4.56 gears I may be able to use overdrive without going downhill with a tailwind. I like the idea of coming off the line with lower gearing also. Quote Link to comment Share on other sites More sharing options...
DanDanLongDan Posted September 15, 2015 Author Share Posted September 15, 2015 Ask jdemeris. He knows everything. Quote Link to comment Share on other sites More sharing options...
zero Posted September 15, 2015 Share Posted September 15, 2015 I put 4.56 to 1 gears in my 1988 Minicruiser last year. Made a huge difference. I can now use overdrive. End result is now - in OD - I'm running a little lower RPMs then I did previously - with the 4.10 gears and auto trans in 3rd (OD-4th pretty much was not usable). Much better pulling power in the lower gears. Two questions: #1 - You did not mention what you did for speedometer correction. I used an adapter-gearbox to make it read right after the gear change. #2 - You certainly sound like you know what you're doing To anyone else who may not - you have to be VERY careful changing the drive-flange. It is very easy to over-tighten and then ruin the bearings after just driving a few miles. I've seen several Toyota trucks get the bearings burnt up after some "mechanic" put in a new pinion seal. Unless it has been converted to a stacked-shim setup - OEM it has a crush-collar. It is designed to crush under a certain amount of torque when new. Once it is installed, and you take it apart to put in a new seal or flange - there is NO more crush allowed and you can NOT torque the nut on again as if if was new. Quote Link to comment Share on other sites More sharing options...
Pete1122 Posted September 15, 2015 Share Posted September 15, 2015 Another solution to your speedometer being off is do what I did, install a Heads up display which projects your speed via GPS on the window, it's pretty slick. Quote Link to comment Share on other sites More sharing options...
zero Posted September 16, 2015 Share Posted September 16, 2015 Yes, but GPS does not work everywhere I go. I'd much rather have a mechanically driven odometer and speedometer. Not hard to get an adapter gearbox to make it all work correctly with a rear-axle gear change. New OEM speedo gears are not an option since Toyota never made the correct speedo gears for a 4.56 to 1 rear axle and 185R-14" tires. Quote Link to comment Share on other sites More sharing options...
Kane Posted September 20, 2015 Share Posted September 20, 2015 I have a 91 Itasca 1 Ton Dually What are the gears in mine now? Thank You Quote Link to comment Share on other sites More sharing options...
Derek up North Posted September 20, 2015 Share Posted September 20, 2015 Likely 4.10:1 but maybe 4.30:1. Quote Link to comment Share on other sites More sharing options...
zero Posted September 20, 2015 Share Posted September 20, 2015 According to Toyota, 1991 cab & chassis trucks were only shipped with 4.1 to 1 rear-axle ratios. Quick way to check is to just jack one side off the ground. Put the trans in neutral. Mark the driveshaft. Turn the wheel(s) on the side that is up one full turn. Count how much the driveshaft turns. If the driveshaft makes just a hair over two full turns when the wheel(s) turn once - it's a 4.10 to 1 ratio. If the driveshaft turns 2 1/8 turns -it's a 4.30 to 1. If the driveshaft turns 2 1/4 times - it's a 4.56 to 1 ratio. If for some reason you've got a locking rear and cannot turn one side when the other is on the ground - they you must turn all the wheels together with all up - and double all those readings. Quote Link to comment Share on other sites More sharing options...
Kane Posted September 20, 2015 Share Posted September 20, 2015 Thank You Quote Link to comment Share on other sites More sharing options...
Derek up North Posted September 20, 2015 Share Posted September 20, 2015 Check the sticker that should be in the doorpost. http://www.brian894x4.com/Gearratiosanddiffs.html Quote Link to comment Share on other sites More sharing options...
linda s Posted September 20, 2015 Share Posted September 20, 2015 We did a what's your gear ratio thing on the toyota-campers site a few years ago and there were quite a few with a 4.30 gear ratio. Seen most often on the rare models with the 5 speed transmission Linda S Quote Link to comment Share on other sites More sharing options...
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