Hello every one. I am using a 700r4 trans, the rear end has 4.10 gears. my tire size is a about 29" tall. I am using the calculator from the website below. I don't know if I can trust it though. At 70mph .70.1 gear, and 4.1 in the rear...2270 rpm Is that right? Any one know other websites or run a drive train close to this. http://www.csgnetwork.com/rpmcalc.html
Pretty close. Rule of thumb: If your tire height and overall gear ratio have the same numbers, you will need about 2000 rpm for 60 mph, or 3000 rpm for 90. Your overall gear ratio is about 2.87; with a 29 inch tire you will have an excellent combination.
Ran a T5 in last car with .7 OD, and 4.11 rearend. Worked just fine. ***uming you are using lockup converter.
Here is my issue-well...one of many I have according to me wife. But the one I ma working on today is to use this rear end or not. It has a torque tube on it, I was going to pull it off and machine a hub to make it open drive. If I can due this. I am stuck with the 4.1 gears in the back. Or option 2-use the rear end out of a ford ranger...already open drive..3.7 somethings gears in the back, but need to use an adapter plate for my wheels. Which gears are better higher or lower. Do I want to go for a rear end with 3.73 or 3.5? gears.
This site has a number of calculators that can be used. http://www.4lo.com/4LoCalc.htm This one is a favorite of mine since it not only has the formulas it has solutions and tells what speedometer drives to use to get the thing correct. http://www.transmissioncenter.net/s...______va.htm?gclid=COuhyPaegJYCFQEziQod3SGNeQ Lately I've found that if you have a hand held gps that gives speed readouts you can make a run down the road and figure out how far off percentage wise your speedometer actually is and go from there. Or you can just make note of the differences and go from there.
Go for it. The 4.11 will be good in town, the .70 overdrive ratio will reduce the effective ratio by .30 percent, or about 3:00 to 1, good for the highway. It's confusing, but a lower number ratio (3.00 to 1) is called higher ratio than a high number (4:11 to 1) which is considered a lower ratio. The higher number 4.11 (a low ratio gear) is better for acceleration, the lower number 3.00 (a high ratio gear) is slower on acceleration but better for highway cruising. You can fine tune your highway cruise RPM by changing your rear tire diameter if you feel the need. You are close with the 4.11, gears, 29 inch tires, and 700 R4.
I believe (but can be wrong) the 200r4 has a convertor that locks up electrically to affectively make it like a stick shift transmission with no slippage. Do you understand now?
looks there is a kit i can by for about $90 to have the overdrive kick and on by itself, saw it through summit.
Most Turbo 350 and 400 transmissions have a non-lockup convertor. The part that is concerned here is that cruising speed, what drives the gears in the transmission in the torque convertor, has a speed that is very close to crankshaft speed. It is not coupled mechanically like a lockup convertor. A lockup convertor has a clutch facing and friction unit that causes mechanical engagement of the shell and what mechanically drives the transmission, causing driven speed to be whatever crankshaft speed is. 700R4 and other transmissions have this feature, which can also be overriden by the operator with correct equipment. The best way I know to describe how they work.
You have time. Research different brands and styles of lockup kits and ask people their opinions. A lot of the wiring kit companies also sell them. Then make up your mind. The OD transmissions are very nice when set up properly. PLUS, you'll get jack rabbit starts with the 4.11.
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