Conroe Powdercoating Posted March 11, 2014 Report Share Posted March 11, 2014 ok, I have the ability to do the fab work, just curious, what would it do to the final gear ratio if I did this. basically, I have the skills to build just not figure the gear set ratios to see mathmatically what would it do. If I added another 3 speed to the rear of my 51 3 speed, would the ratios even work? say the front box in 3rd and the second box in(?) and what is the result with a 4.1 rear? or should I stop listening to the voices in my head? Quote Link to comment Share on other sites More sharing options...
casper50 Posted March 11, 2014 Report Share Posted March 11, 2014 If the voices are saying that you aren't crazy I'd stop listening. lol Quote Link to comment Share on other sites More sharing options...
Plymouthy Adams Posted March 11, 2014 Report Share Posted March 11, 2014 are you planning on building a crawler....check out using one of these...Spicer 5831..this may be what you are trying to do..few blurbs on the net that may answer your questions better than here.....the item I think you are trying to get is from reversing the second tranny and they are not rugged enough to do that as I understand it... Quote Link to comment Share on other sites More sharing options...
Merle Coggins Posted March 11, 2014 Report Share Posted March 11, 2014 What are you hoping to gain? Since both 3 speeds are 1:1 in 3rd gear, even if both were in 3rd you'd still have a 1:1 ratio. You'd just have several lower ratio splits to play with, which would be helpful if you're pulling around 18 wheelers. Merle Quote Link to comment Share on other sites More sharing options...
Conroe Powdercoating Posted March 11, 2014 Author Report Share Posted March 11, 2014 (edited) whelp, that answered what I thought but just wasnt sure 1.1 is still 1.1, and again, the voices said it would be ok:-) Edited March 11, 2014 by Conroe Powdercoating Quote Link to comment Share on other sites More sharing options...
Grdpa's 50 Dodge Posted March 11, 2014 Report Share Posted March 11, 2014 Way way back in yesteryear,,,my dad and uncle 'built' a vehicle type tractor/car that was designed to drill rye between standing 40 " rows in the fall in standing corn before harvested without damaging corn. theory was it gave it much more time to matuure and grow giving more time for fall growth. Used two 3 speed trannnys one after another to a VERY narrowed rear axle. For power they put a air cooled Wisconsin engine on it that usually powered the elevator to the corn crib. They used it ONE year and parked it in the shed, never to see light of day again. Scared the beejeebers out of them and was way to narrow for how fast it went down the road, Us kids wanted it for a go cart which was over ruled. Just NOT stable at 40-50 mph built that narrow. BUT as other posters said in third gear in both its 1 to 1 straight thru so motor rpm is revolutions per minute. I am sure it had power tho shifted down on both. Other double tranny set up was we had 2 connected run by a 2 hp electric motor to run and old grain elevator in a perfectly flat configeration without trucks under it. I stuck it under a house I lived in once and crawled under a very tight crawl space I couldnt move in. Took a short handle shovel and threw dirt in elevator out of there and dug a very nice 4 foot crawl space in very short order. There is zero way a 2 hp motor would pull that and get it to run slow enough to make that work without 2 trannys. think ran one in reverse and one in 1rst to get it running right way with most torque. It would take all I could get to it and in it Now if BOTH had overdrive gears and got it rolling to get both in OD,,,wow,,,that would be cool. Had a 91 Dodge Cummins once with OD but it needed another OD gear to use the power it had to keep revs down and speed up. OR a higher gear in the rear end. Granny low was way to slow especially in 4 wheel low and 1 rst gear. Quote Link to comment Share on other sites More sharing options...
Lumpy Posted March 11, 2014 Report Share Posted March 11, 2014 It does work the other way around. I used to work with a guy who had an old Power Wagon. He mounted another tranny behind the tranny, backwards, and that gave him some Lower gears, and a decent highway gear...if I remember it right. I forget exactly how it worked, but I did see it with my own eyes. So, the theory seems to work for an underdrive, but it wouldn't make an overdrive. But perhaps an underdrive would produce an overdrive, if the rear end gears were very tall. ??? Purposly over gear (low numerically) the rear end, and get the real ratio you want by under driving it a bit. ??? Although, in actuality, that would be a lot of work and fabrication when you could just install an overdrive transmission. Great brain teaser. ken Quote Link to comment Share on other sites More sharing options...
Don Coatney Posted March 12, 2014 Report Share Posted March 12, 2014 If you really want a creeper gear mount 2 trannys together and put them both in reverse.. You will go forward at a vary slow speed. Quote Link to comment Share on other sites More sharing options...
Ricky Luke Posted March 12, 2014 Report Share Posted March 12, 2014 This does have a Mopar angle... My dad bought a home brew T model tractor. The front axle was cut and narrowed, and the spring rerolled to suit. The Ford box was directly coupled to a Dodge 3 speed, which was in turn directly coupled to a worm drive T Ford truck diff. Wheelbase was about 6'. No springs on the rear. A piece of 1/4" plate was the firewall. It had a magneto ignition, which was a real pain to start. You had to turn the engine over on the handle fast enough to get the magneto to spark, and hope it didn't back fire. It did once, and broke my dad's hand and wrist, and dislocated his elbow and shoulder (that's the pain...). He sold it shortly after that. It was great fun to drive as a 10yo. ANYWAY - the Dodge box was mounted in backwards, and with no real clutch you couldn't change gears on it either. The first time it was started, it was bogged nearly rear axle deep in clay. The guy helping dad picked what he thought was 1st on the Dodge box, selected low on the Ford, and the thing started to climb backwards over the rear wheels. Don quickly pushed the Ford reverse pedal, and down she came... I never got around to figuring out the ratios. Top speed was probably only 20 MPH with the truck diff, but geez it seemed a lot faster. Rick Quote Link to comment Share on other sites More sharing options...
Conroe Powdercoating Posted March 12, 2014 Author Report Share Posted March 12, 2014 I wasn't wanting a creeper, I was thinking that it could be done easily enough, it would produce a range of highway gears that one could shift into. The reason I thought of this is that real world, it wouldnt be to difficult to build or create, I have 2 x 3 speeds sitting here and over drive units are rare as hens teeth and priced as if they were made of unobtanium. Ill just swap the rear for an exploder unit and press on with the 230 cu in., 500 cfm edelbrock and blow through turbo install instead. Quote Link to comment Share on other sites More sharing options...
Robert Horne Posted March 12, 2014 Report Share Posted March 12, 2014 Maybe a 5 speed transmission would do for the time being.... 1 Quote Link to comment Share on other sites More sharing options...
Conroe Powdercoating Posted March 12, 2014 Author Report Share Posted March 12, 2014 Maybe a 5 speed transmission would do for the time being.... yes sir, I have read up on the ranger 5 install, I am indeed not afraid to toss one in and very well may. Might grab one or two up before they get to popular anways. Quote Link to comment Share on other sites More sharing options...
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