POPTOP Posted September 25, 2016 Report Share Posted September 25, 2016 tried to find answer Im not that comp savvy I have a b1b with 218 motor and a choice of a 3 speed and a 4 speed I have 2 different rear ends if I turn the break drum one full rotation the yoke on one turns 2 1/8 times about? and the other turns 4 1/8 which rear and tranny would you use only reason I am leaning on the 4 speed is I read its a stronger tranny than the 3 speed and I do have the bell housing for both ps I don't want to be late to a car show and I don't want to leave to early Quote Link to comment Share on other sites More sharing options...
Don Coatney Posted September 25, 2016 Report Share Posted September 25, 2016 A forum search will net many answers to your question. 4 or 3 speed in top gear are both a 1/1 ratio. Differential ratio is something you must do the math on for your vehicle. One ratio does not work for every vehicle. Quote Link to comment Share on other sites More sharing options...
Los_Control Posted September 25, 2016 Report Share Posted September 25, 2016 Just my tw0 cents. If high gear in the trans is 1:1, then will be same rpm in 3 speed high gear as a 4 speed high gear. The 4 speed has the granny low that you early use, how often will you pull stumps with your truck? So the 4 speed is essentially a 3 speed with a sexy stump pulling gear in reserve. I do think the 4 speed is a stronger transmission. The 3 speed I bet has slightly different gearing getting to top gear. The weak link on a 3 speed is the 3 on the tree linkage. It actually works very well, but always got ignored in the routine maintenance schedule, so it needs new bushings and shims and lots of grease to get operating again. The sexy thing about the 3 speed, is the shifter on the column. I think what you really want is info on the rearend gear ratio, and what rearend to use. What I gather, and am very new to just researching this info myself, it is a set of 3.73 gears wiith a 4 speed trans to make it more drivable. I have yet to see anyone with a 3 speed talk about a gear change and if the 3:73 also work for them. Quote Link to comment Share on other sites More sharing options...
Jeff Balazs Posted September 26, 2016 Report Share Posted September 26, 2016 Boy things really have changed over the years........I still can't imagine anything less sexy than a 3 on the tree........Ok maybe a slip and slide Powerglide. 1 Quote Link to comment Share on other sites More sharing options...
POPTOP Posted September 26, 2016 Author Report Share Posted September 26, 2016 it a 3 speed on the floor and Ive heard a 4 speed is a last longer tranny Quote Link to comment Share on other sites More sharing options...
Los_Control Posted September 26, 2016 Report Share Posted September 26, 2016 We could really get iin trouble here, talking about rearends. Do these tires make my rear look fat? Quote Link to comment Share on other sites More sharing options...
Merle Coggins Posted September 26, 2016 Report Share Posted September 26, 2016 B1B wouldn't have a column shift. Even 3 speeds were floor shift. Depending on which version 4 speed you have, and condition of the transmissions, I'd probably go with the 3 speed. Early 4 speeds are not synchronized. 3 speeds are synchronized in 2nd & 3rd. Your axle ratios done add up. When you do that test you need to ensure that both wheels turn equally, otherwise the differential action will give false results. If you can block one wheel from turning, then multiply your pinion rotations by 2 to get the results. Or look for some numbers stamped on the differential housing that will indicate the ratio. Quote Link to comment Share on other sites More sharing options...
POPTOP Posted September 26, 2016 Author Report Share Posted September 26, 2016 Thanks Merle that's what I was looking for ! When Im all done I can honestly say this is the truck Flat Head forum built . Quote Link to comment Share on other sites More sharing options...
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