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6 speed Manuel transmission

 
Old 05-14-2019, 07:26 PM
  #21  
69ttop502
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Originally Posted by jb78L-82 View Post
I love the nonsense that you need a giant BB engine to utilize a 6 speed OD manual. NOT TRUE!

My 355 L-82 with AFR heads, roller cam and 10.2 compression can pull effortlessly with 3.70 gears and a 1:1 fourth gear below 1,000 RPM (700-800 RPM) with zero bucking from the engine/tranny. Any big V8 (a 350 is a big V8-BTW-5.7 Liters) can utilize a 5 or 6 speed OD with no lugging or bucking issues. Where does this stuff come from? Unless you have an engine with a cam operating range of 3,500-7,000 RPM an overdrive tranny should not be a challenge. A low torque 4 cylinder 1.8 liter engine is another story.

This stuff comes from the people that have cams that are not happy at that low of an rpm. My solid roller 502 does not like it under 2400 rpms. Therefore a tall overdrive gear would not work. That’s the reason I went with a 3.08 rear gear and a 5 speed with a 1:1 fifth gear. Not every V8 will work with a deep overdrive. Gears and cam make more difference than displacement. More than one way to skin a cat. I like the Richmond 6 speed in that you have a close ratio 5 speed with an overdrive. Most of the overdrive 5 speeds and 6 speeds lose the feeling of a nice close ratio transmission.

Last edited by 69ttop502; 05-14-2019 at 07:27 PM.
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Old 05-14-2019, 07:32 PM
  #22  
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I like the TKO-600RR close ratio 5 speed with the 0.82 fifth gear.
I'll be running it with 3.08's behind my 496.
2200 rpm @70 mph will work great with my cam cruising down the highway.

Last edited by OldCarBum; 05-14-2019 at 07:32 PM.
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Old 05-14-2019, 07:36 PM
  #23  
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I you have a 3.08 or higher rear gear you could get away with using a Richmond 5 speed. I have one and it's great with my 2.87 rear gears
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Old 05-14-2019, 07:40 PM
  #24  
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BTW--- I don't think you would have to do any permanent modifications to install the Richmond 6 speed. Just looked and I installed mine almost 21 years ago. If I did not want to cut my crossmember then I could have installed it from the top attached to the engine. It fits in there nicely. Nevertheless I'm glad I made my crossmember removable.

I got a "conversion" u-joint to mate output yoke with stock driveshaft. Anyway, if you end up finding one then I can give you more pointers and part numbers.

My 1st thru 5th are close ratio--- I selected them when I ordered it from Summit Racing. The 0.62 overdrive is just about wonderful for cruising. It ends up equating to about a 2.54 rear end. It's easy to find yourself going too fast now.

Last edited by carriljc; 05-14-2019 at 07:41 PM.
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Old 05-14-2019, 07:45 PM
  #25  
BLUE1972
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I have the Silver Sport 5 speed kit in my 71, fit perfect - no mods. They give you the correct new driveshaft.

355 rear and .6 overdrive, at 80 mph about 2000 rpm.

Last edited by BLUE1972; 05-14-2019 at 07:46 PM.
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Old 05-15-2019, 08:51 AM
  #26  
jph79
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Ok thanks for all the good info. I think I'll go with the 5 speed cause it fits better and this car will not see a track. Might put in in a lower rear end in time cause it would be nice to smoke the tires some in first. And second. Is that possible with with thie 5 speed? Should have said I do have a 335 with 200 cc heads and and a xe cam. But still have no interest in cutting my tunnel
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Old 05-15-2019, 10:57 AM
  #27  
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My Tremec TKO-600 has a 2.87 first gear and the Tremec 5 speed has a 3.27 first gear.
You should be able to light up the tires with either.
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Old 05-15-2019, 07:06 PM
  #28  
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x2 they are a noticeble difference from say a Muncie 2.20 low (which feels tall). That 2.6 or close feels just right...even with a 4.11 you wont be shifting gears halfway across the intersectino. I see people post that not sure where that info is coming from unless they never take their engine over 2k.

When funds allow Im having the Z06 close ratio gearset installed in this T56 along with a Viper input shaft which has been collecting dust.

Last edited by cuisinartvette; 05-15-2019 at 07:07 PM.
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Old 05-18-2019, 04:17 PM
  #29  
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I just finished a 5-spped Tremec in my 68 427 4.11 rear car
It is perfect. Just like original except that satisfying shift into 5th once at cruising speed.
The car is now a perfect blend, boulevard cruiser and highway flying,
I went with Silversport they were great to work with.
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Old 05-20-2019, 12:17 PM
  #30  
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I agree with you.with my 370 gears my 6 speed works great.The only reason im going to a 411 ratio is to utilize more of my 5th and 6th gear.I dont want to go faster than 125 mph, maybe a high 12 second 1/4 mile car , if that makes any sense.
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Old 05-21-2019, 07:48 AM
  #31  
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multiply 1st ratio by final drive ratio. called launch ratio, 9 to 10 is streetable. 11 is drag strip. on the street unless really winding it out, you will be hitting second almost immediately with 11:1 launch.
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Old 05-21-2019, 12:27 PM
  #32  
cuisinartvette
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Less may be ideal if its stock or mild.....10.9 first below never shift before I get out of the intersection like some say...unless they are shifting at pretty low rpm?

4.11 26 in tire 2.66 1st just pussyfooting it around. 2:15 5th towards the end use 5th and 6th....4.11 is not that low. In the primaries barely the entire time burning off old pump gas. Hope this helps.

Last edited by cuisinartvette; 05-22-2019 at 08:41 PM.
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Old 05-22-2019, 08:53 AM
  #33  
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Originally Posted by cuisinartvette View Post
Less may be ideal if its stock or mild.....10.9 first below never shift before I get out of the intersection like some say...unless they are shifting at pretty low rpm?

4.11 26 in tire 2.66 1st just pussyfooting it around
https://www.youtube.com/watch?v=oOZFtGkcfgc
Thanks for this, and just what I am looking for. It cemented what I will be going with for gearing. Loving the ZZ Top keychain. I still have mine from my first live concert ever back in the 80's :-p

Last edited by PainfullySlow; 05-22-2019 at 08:56 AM.
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Old 05-22-2019, 03:08 PM
  #34  
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My 10 C6Z06 turns 1,800 RPM at 80 MPH in 6th which is an absolutely beautiful thing after driving the 78 L-82 with 3.70 gears in 4 th on the highway. The LS7 can turn 1,800 RPM all day long at 80 mph AND get 28 MPG.......................incredible.

If I had a steep OD in my 355 L-82 with the roller cam and AFR heads, I could easily turn 1,800-2,000 RPM all day long as well on the highway and probably get 23-24 MPG with the Holley 4175 650 CFM with the small primaries, just the qjet . The gearing is the biggest limiting factory to great MPG's in these cars.....

Last edited by jb78L-82; 05-22-2019 at 03:11 PM.
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Old 05-22-2019, 10:08 PM
  #35  
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If you have EFI a plus...or small cam big stroke. KNow a # of guys with mild motors that thought wiht a 3.08 and 700r they would lug it and get good mpg. They alll regeared at least .50
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