TKX 5 speed Feedback
Race Director
Joined: Apr 2007
Posts: 11,152
Likes: 890
From: South Western Ontario
I have the wide ratio TKX that I'm putting in a 69 GMC 910. I'm not worried about driving with the 0.72 5th at all but I think/hope the lower ratio gear will help when I'm towing with it.
Advanced
Joined: Jun 2019
Posts: 84
Likes: 40
From: Pittsburgh, PA
I converted my 74 from a TH400 to the TKX close ratio a little over a year ago. I love it, its the single best upgrade I have done to the car. The whole process took me about 40 hours of wrench time working by myself nights and weekends with the car on jackstands.
Im running a 3.55 rearend
Im running a 3.55 rearend
Old Pro Solo Guy
Joined: Dec 2017
Posts: 8,086
Likes: 4,444
From: Marlton NJ
My buddy George and I drive different roads. We both have Big Blocks.
He wants to use 5th gear at 50-55 on 2 lane roads, @ 1900rpm.. So he has 411 gears. He had 373s and did not like them for those roads.
I want mine to act like a 4spd and then use the OD gear on the interstate. Around here that is 75mph + or you get run over. I won't use 5th until 65mph @ 1900.. I have 323s.
If you have a SB with a big high rpm cam you might want to keep it at 2500+ even in cruise.
So there is no one correct answer.
He wants to use 5th gear at 50-55 on 2 lane roads, @ 1900rpm.. So he has 411 gears. He had 373s and did not like them for those roads.
I want mine to act like a 4spd and then use the OD gear on the interstate. Around here that is 75mph + or you get run over. I won't use 5th until 65mph @ 1900.. I have 323s.
If you have a SB with a big high rpm cam you might want to keep it at 2500+ even in cruise.
So there is no one correct answer.
Last edited by leigh1322; Jul 20, 2023 at 11:27 PM.
Drifting
Joined: Oct 2020
Posts: 1,567
Likes: 576
From: Wisconsin
My buddy George and I drive different roads. We both have Big Blocks.
He wants to use 5th gear at 50-55 on 2 lane roads, @ 1900rpm.. So he has 411 gears. He had 373s and did not like them for those roads.
I want mine to act like a 4spd and then use the OD gear on the interstate. Around here that is 75mph + or you get run over. I won't use 5th until 65mph @ 1900.. I have 323s.
If you have a SB with a big high rpm cam you might want to keep it at 2500+ even in cruise.
So there is no one correct answer.
He wants to use 5th gear at 50-55 on 2 lane roads, @ 1900rpm.. So he has 411 gears. He had 373s and did not like them for those roads.
I want mine to act like a 4spd and then use the OD gear on the interstate. Around here that is 75mph + or you get run over. I won't use 5th until 65mph @ 1900.. I have 323s.
If you have a SB with a big high rpm cam you might want to keep it at 2500+ even in cruise.
So there is no one correct answer.
