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-   -   Anybody go from 3:55 rear gear to 3:08? (http://www.clubcobra.com/forums/all-cobra-talk/144268-anybody-go-3-55-rear-gear-3-08-a.html)

H-Rod 12-04-2020 09:48 AM
Quote:
Originally Posted by bwcobra15 (Post 1485946)
Mike, i'm thinking about the same thing. I have 427w 600hp/600tq .. TKO600 w/.82 OD. Ford 9" w/3.50:1. 15" Goodyear billboards. I get about 3k rpm at 80mph. was looking at going to 3.27 but a complete differential LSD center section from Hurricane (via John's i think) was over $1k if I recall.
If you`re coming out to the toy run Saturday, we can talk more.

fastd 12-04-2020 12:39 PM
depends on what kind of person you are.

I had tko3550 with a 3.27 1st gear and .64 5th gear with 3.55 rear gear and really didn't like the drop off from 4th to 5th gear. I also didn't need that much gear in 1st either; so I hated my 1st and 5th gear.

I changed transmissions to a 6 speed T-56 with a 2.66 1st gear, .8 5th gear and .63 6th gear.

Tko3350 with a 3.55:
1st gear x rear gear ratio = 11.61 [too high in my opinion]
5th gear x rear gear ratio = 2.27 [too low in my opinion]



I really like the new gear ratios in my t56 so I think you would be fine with 3.08s...
T56:
1st gear x rear gear ratio = 9.44
5th gear x rear gear ratio = 2.84

Year current tko600 with 3.55 gear:
1st gear x rear gear ratio = 10.19
5th gear x rear gear ratio = 2.91

your TKO600 With 3.08 rear gear:
1st gear x rear gear ratio = 8.84
5th gear x rear gear ratio = 2.53

fastd 12-04-2020 12:42 PM
Good to make a spreadsheet so you can compare different gear ratios x rear gear in different transmissions to get to the right spot.

saltshaker 12-04-2020 01:58 PM
I had a A&C with a tko600,3.50 gears,315’s with a 428fe...the rpms didn’t bother me as much as the noise. I switched the mufflers to Classic Chambered Mufflers and at 75mph I would have conversations with the passenger and hear every word.
Jon

eschaider 12-04-2020 04:43 PM
Quote:
Originally Posted by fastd (Post 1485988)
depends on what kind of person you are.

I had tko3550 with a 3.27 1st gear and .64 5th gear with 3.55 rear gear and really didn't like the drop off from 4th to 5th gear. I also didn't need that much gear in 1st either; so I hated my 1st and 5th gear.

I changed transmissions to a 6 speed T-56 with a 2.66 1st gear, .8 5th gear and .63 6th gear.

Tko3350 with a 3.55:
1st gear x rear gear ratio = 11.61 [too high in my opinion]
5th gear x rear gear ratio = 2.27 [too low in my opinion]



I really like the new gear ratios in my t56 so I think you would be fine with 3.08s...
T56:
1st gear x rear gear ratio = 9.44
5th gear x rear gear ratio = 2.84

Year current tko600 with 3.55 gear:
1st gear x rear gear ratio = 10.19
5th gear x rear gear ratio = 2.91

your TKO600 With 3.08 rear gear:
1st gear x rear gear ratio = 8.84
5th gear x rear gear ratio = 2.53

fastd, try the Second Strike Gearing Calculator <= clickable. It has all the transmissions, ring & pinions and tire sizes built in so you can do quicker comparisons — and it will do it for all gears across all rpms.


Ed

Gaz64 12-04-2020 06:00 PM
Quote:
Originally Posted by fastd (Post 1485988)
depends on what kind of person you are.

I had tko3550 with a 3.27 1st gear and .64 5th gear with 3.55 rear gear and really didn't like the drop off from 4th to 5th gear. I also didn't need that much gear in 1st either; so I hated my 1st and 5th gear.

I changed transmissions to a 6 speed T-56 with a 2.66 1st gear, .8 5th gear and .63 6th gear.

Tko3350 with a 3.55:
1st gear x rear gear ratio = 11.61 [too high in my opinion]
5th gear x rear gear ratio = 2.27 [too low in my opinion]



I really like the new gear ratios in my t56 so I think you would be fine with 3.08s...
T56:
1st gear x rear gear ratio = 9.44
5th gear x rear gear ratio = 2.84

Year current tko600 with 3.55 gear:
1st gear x rear gear ratio = 10.19
5th gear x rear gear ratio = 2.91

your TKO600 With 3.08 rear gear:
1st gear x rear gear ratio = 8.84
5th gear x rear gear ratio = 2.53
A low numerical ratio like 2.27 is a high ratio.
A high numerical ratio like 11.61 is a low ratio.
So when comparing ratios, say for 1st gear, 13:1 is a LOWER ratio than 11.61.


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