J's69Mach1 17 Report post Posted February 21, 2021 With several choices, If you pick 1 TKX, which one would it be and why ? They have a TKX with 2.87 first gear, along with the .81 5th gear. listed as more for Road Race. Quote Share this post Link to post Share on other sites
copb8 97 Report post Posted February 22, 2021 Interested in hearing peoples opinion on this as well Quote Share this post Link to post Share on other sites
1969_Mach1 333 Report post Posted February 23, 2021 With those, even the close ratio versions have a fairly low first gear ratio. My thoughts with using a close ratio top loader 4sp in my Mach 1, I'd select one of the middle two close ratio versions and use something like a 3.50 or 3.70 rear axle ratio. The overdrive ratio will depend on how you want to drive on the freeway. 1 barnett468 reacted to this Quote Share this post Link to post Share on other sites
EastYorkStang 63 Report post Posted February 23, 2021 I'd pick the 17765. First and second are closer together not allowing much of a bog when shifting. Better Overdrive ratio as well. Quote Share this post Link to post Share on other sites
SM69Mach 68 Report post Posted February 24, 2021 What is the rest of your setup, motor, gearing etc? Like 1969_Mach1 said, OD is how you want to drive, but I would think also on your setup. I have the standard TK600 similar to the 17765 with the lower OD gear. But I am mainly a highway cruiser and with a big block, plenty of low end grunt if I need to get things moving. Quote Share this post Link to post Share on other sites
rwcstang 201 Report post Posted February 24, 2021 I say TCET18084 would be great for anyone running 3:50+ rear end gears and for TCET17765 would be mainly for daily use Quote Share this post Link to post Share on other sites
TexasEd 188 Report post Posted February 25, 2021 On 2/23/2021 at 10:37 AM, EastYorkStang said: I'd pick the 17765. First and second are closer together not allowing much of a bog when shifting. Better Overdrive ratio as well. Same but how would it work with a 3.50 rear Quote Share this post Link to post Share on other sites
rwcstang 201 Report post Posted February 25, 2021 27 minutes ago, TexasEd said: Same but how would it work with a 3.50 rear I have a TKO600 with a 064 5th gear with 3:50s and my RPMs are around 1900-2k at 65 mph, I dont think 068 5th gear would make a difference. 1 TexasEd reacted to this Quote Share this post Link to post Share on other sites
barnett468 418 Report post Posted February 26, 2021 I would use either of the 2.87 gear trannies because they have a numerically lower first gear, so it is actually usable because you can go faster than 6 mph before you have to shift. A 3.27 or or numerically higher first gear is good for steep hill climbing or a lame V8 or even lamer 6 cylinder engine. T5 Z SPEC . . . . 2.95, 1.94, 1.34, 1.00, 0.63 TKX . . . . . . . . . .2.87, 1.89, 1.28, 1.00, .068 1 J's69Mach1 reacted to this Quote Share this post Link to post Share on other sites
smh00n 87 Report post Posted March 4, 2021 High first gear every day. Unless you're running a 2.75 gear you'd be lucky to get to 6 mph before you started bouncing off the limiter with the lower first. And then the thing will fall off the cam into 2nd. I went with the 0.81 5th in my TKO600 as I don't see me doing a road trip in it. And if I do, I'll make sure my credit card is empty so I can gas it up each little town. Quote Share this post Link to post Share on other sites