1.69 or 1.80

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Post  bruno on November 6th 2012, 3:50 pm

there is a pretty informative discussion in reguards to the topics .... can the same thing be accomplish with going to a taller gear in the rear end ?

being able to apply more power on the hit ...... i guess there is a 1.64/5 that is a vasco piece but it cost 2200 ...that will drop right in a stock p/g case .... thats a lot of cows Very Happy

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Post  bruno on November 6th 2012, 4:22 pm

as quoted from the discusion

put the lowest trans gear you can get in it (1.69- not 1.80) and the most rear gear you can (assuming you can make the finish line without over revving it). Closer (lower drop on the shift) ratio setups are faster in practically every application. You are correct in your assumption of putting in the 1.69.



As for just considering the overall first gear ratio.........thats great, until you drop it in high gear and then you have the issue of trying to drag a heavy car, with only a 3.50 or so rear gear. You get much better results with the taller trans ratio and lower rear gear ratio, as the car will accelerate better AFTER the shift, with a 3.73, 3.89, 4.10 etc, than something tall.

I have also heard about the taller gear sets coming for the trans, but I have not heard if there will be a new case, or you will have to modify current cases. Building gearsets is no problem, getting them in the case is the issue. To build a strong gear set, with a tall ratio, requires the ring gear be bigger and it simply won't fit in a stock power glide case. The tallest I currently know of, that WILL fit in a stock case, is the 1.62 that is made by ATI, but it is all Vasco and will cost you about $2200.


If you can consistently get the car down the track with 1.80s, yes, they will last longer...........but..........I doubt that is going to happen with your combination. The 1.69, will be more forgiving, more consistent AND faster.

As far as radials vs slicks...........NOTHING is as hard on parts as radials and it has nothing to do with the sidewalls. It is the nature of HOW the tire works. You can "blacktrack" or spin a slick down the entire length of the track, more or less and the car still go fast. You spin a radial, it is done and you are dead in the water. A radial is "dead hooked" all the time, or you are not going anywhere. THAT is hard on parts.

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Post  richter69 on November 6th 2012, 5:47 pm

YB thread.........
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Post  bruno on November 6th 2012, 6:10 pm

uote="richter69"]YB thread.........[/quote]

yes ...why couldnt you just change the rear end gear to get the same results ????? if the 1.80 is a better piece

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Post  richter69 on November 6th 2012, 7:27 pm

less drop on the shift w the 1.69
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Post  cool40 on November 6th 2012, 8:19 pm

use a 3spd. Razz
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Post  Mahoney3105 on November 7th 2012, 10:45 am

Anyone ever try a 1.69 first gear in a naturally aspirated car that's not 2600 pounds.

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Post  BUZZ BUZZARD on November 7th 2012, 5:02 pm

A three speed, that's very funny! I ran the 3.50 gears this weekend with great results. Ran five rounds in eliminations. Car ran four 5.85's in competion, to me that is very consistent. The sixty foot is back to 1.27 with 119mph in the eighth mile. Super-pro only ran eighth, so I didn't get a time slip for the 1/4 mile. Two weeks ago it ran 5.89 and 9.14 with the 3.18 gears so it should have run 9.1's to 9.0's. I like this combo because I don't have to twist the guts out the motor if I run 1/4 but it still can win rounds in a very competitive class full of dragsters. Yes it still has the C-6 in it!

sorry didn't want to hyjack the tread but just wanted to say that a chevy powerglide is not the only option out there, I am very pleased that I gave that old three speed another chance to go fast.

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Post  Larry T on November 7th 2012, 10:37 pm

bruno wrote:uote="richter69"]YB thread.........

yes ...why couldnt you just change the rear end gear to get the same results ????? if the 1.80 is a better piece [/quote]


truth is its a fine line......haveing too mutch rear gear with a 1.80 and not enough hp off the hit 60ft time will suffer.use the 1.69 gear instead of the 1.80 and you will have better results with the tall rear gear Wink
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Post  richter69 on November 7th 2012, 11:13 pm

2 gear T400.......... if your serious
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Post  DILLIGASDAVE on November 8th 2012, 6:26 am

IIRC the Rossler 2 speed TH400 originally came with a 1.57 1st gear ratio. But now days I think that they might also offer 1 or 2 other ratios too.
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Post  theredcar on January 6th 2013, 9:32 am

1.69

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Post  the Coug on January 6th 2013, 7:36 pm

What the H I thought you had to have a 1.80 or it wasn't Kosher?????? I figured if your Big Block has enough Torque it would not matter and besides it's not a small block so why would you need a 1.8 gear set... I run a 1.74 strait cut in mine but what the F do I know I only talked to 5 or so chassis guys and a couple trans drive line guy before I bought mine..... but what do they know......
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Post  richter69 on January 6th 2013, 8:04 pm

there aint enough diff in a 1.80 vs a 1.76 to amount to anything, you get into big power w a radial tire its a diff story.........
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Post  Lem Evans on January 6th 2013, 8:09 pm

The dia. of the tire would be a factor too.

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