Hey Phil, I understand the overdrive thing. Extra gear higher ratio. The part I don't understand o No: is with the 4.10 rear you get 274 and with the 3.73 you only get 249. o No:. Sorry I'm not trying to be a pain in your backside. How is the 4.10 taller than the 3.73 with the overdrive? o No: :beer ou:
Tim, The overdrive is 33% reduced from a 1 to 1 gear. So 100% (represents 1 to 1 ratio/ one full turn of the trans to one full turn of the rear axel) - 33%(overdrive gear) gives you 67% total gear. Now take your rear gear #'s Example is 4.10's multiplied by .67 this gives you the total gearing. Hope this helps.
Hey Phil, It was a case of I just had a brain fart. It was just that from thinking from a stand point of a 4.10 is lower geared than a 3.73 I couldn't see getting a higher gear ratio from the 4.10. It was like what part of "NO" don't I understand. The math part makes sense. Sorry for being a pain in the @#&. Thanks man! "ADD" approved since childbirth.
Tim, No big deal, We all learn as we go. It looks as if I may run around a 390 gear and split the diffrence between the 373's and 410's. This would make the ratio in overdrive a 2.61 (very close to whats in there now 254's) :beer
Phil, With the depth of the first gear in the OD. I would for sure be looking really hard at the 3:73's and maybe at some 3:5?'s. If you were gonna run some taller tires I would say maybe the 73's. The actuall difference in real time, say through a 1/4, isn't gonna be that much with the higher gears. Make the car comfy to drive man. If you were to use the 73's(again I would be looking for a 3:5?) you just stay in first a bit longer, and let it pull a bit harder, then shift. I think I know where your going man. I have 4:10's in my 64' with 29.5" tall tires and it is a racket driving down the road. Just my opinion.
Dave here is the Gear/RPM range with the lock up on. Tires are 295/50/15. where would you go? This is for a 350 that will be in the 400+hp range(actually will know when Jim Burek is done with it). :beer 410 at 70 is around 2428 rpm with overdrive. 390 at 70 is around 2310 rpm with overdrive. 373 at 70 is around 2209 rpm with overdrive. 355 at 70 is around 2102 rpm with overdrive. 342 at 70 is around 2025 rpm with overdrive.
Phil, have you seen Gary's online gear tool? It should help... I think 4-series gears are too steep for use in a driver...my brother had a '68 442 (350hp?) with 4.11 gears and a 4-speed. It was really redundant having 4 gears, we usually drove around town using just 2nd and 4th. If we were in a real hurry, all 4 gears were fun, but 1st was done with in an awful hurry. And MAN, did that car NEED an overdrive on the highway!!! Using Gary's calculator, your tire size, and looking at shifting at 5300 RPM at 40mph (a rather arbitrary number I just picked...), I get the following transmission / rearend combinations for comparison: 3.90 rearend with a 200R4 tranny yields 5399 rpm in 1st @ 40 mph, and 2311 rpm in top gear 70 mph 4.11 rearend with a TH350 tranny yields 5233 rpm in 1st @ 40 mph, and 3634rpm in top gear 70 mph 4.30 rearend with a TH400 tranny yields 5388 rpm in 1st @ 40 mph, and 3802rpm in top gear 70 mph 4.11 rearend with a M20 WR tranny yields 5316 rpm in 1st @ 40 mph, and 3634rpm in top gear 70 mph 4.80 rearend with a M21 CR tranny yields 5336 rpm in 1st @ 40 mph, and 4244rpm in top gear 70 mph So a 200R4 with a 3.90 is similar to a Close-Ratio Muncie with 4.80 gears, but turns 2,000rpm less on the highway! :shock: But if you'd be wasting all that torque multiplication in the lower gears, you might look at going one notch higher for your rearend, and look at shifting 5300rpm at 50mph, instead of at 40: 3.08 rearend with a 200R4 tranny yields 5330 rpm in 1st @ 50 mph, and 1825rpm in top gear 70 mph 3.35 rearend with a TH350 tranny yields 5332 rpm in 1st @ 50 mph, and 2962rpm in top gear 70 mph 3.42 rearend with a TH400 tranny yields 5357 rpm in 1st @ 50 mph, and 3024rpm in top gear 70 mph 3.23 rearend with a M20 WR tranny yields 5223 rpm in 1st @ 50 mph, and 2856rpm in top gear 70 mph 3.90 rearend with a M21 CR tranny yields 5419 rpm in 1st @ 50 mph, and 3449rpm in top gear 70 mph Here, a 200R4 with 3.08 gears is similar to that Close-Ratio Muncie with 3.90 gears, and turns 1,600 rpm less on the highway, you'd be loafing along at 1800rpm :bglasses:
Exactly why I need a little gear. I would technically need only 20lbs of oil pressure too..... :eek2: Thanks for posting that James. I used an online RPM calculator to estimate the RPMS. http://www.dalesplace.com/htm/information/rpm_calculator.htm
I think a 3.73 or even 4.10 would be excellent, especially w/ a buick 350 backed up w/ a built 200r4 and shift kit with the gear vendors od, sounds like a good combo to me.
Why would he use a gear vendors OD with a behind an OD tranny? Either way the tailhousing on a 2004R doesn't un bolt, making the swap not possible. o No: o No:
LOL, heck I didn't even read that right, srry. :laugh: :laugh: :laugh: I re-read it, didn't get it right the first time. ROFLMBO :laugh: L O N G D A Y!!!!!!!!!!!!!!!! S E E M E D L I K E A FRIDAY! ou:
Ahhhhhhhh, finally, today came, better now. :laugh: OD sounds like a good idea when running a high rear-gear. :beer :TU:
