1974 Duster
Morning racers!
Last year I took the Duster racing and after upgrading the headers and tweaking made an additional 70+ hp. This made the transmission angry and you can hear the 2-3 flare towards the end of the day.
13.08 pass:
[video:youtube]
The plan this month is to fortify the transmission and replace the 3.55's with 3.90's and the car should be flying into the 12's.
The transmission is a 904 based 42RH which has been upgraded with a billet servo piston, Trans-go shift kit, 4.2 kickdown lever and 44RE front drum which holds 5 clutches.
The transmission is sort of a science project as I wanted to run the "lighter duty" 42/44RH rather than the 727 based 518RH. If guys can make 904's live behind Hemi's then I should have no problem keeping a 42/44RH behind a fairly mild 5.9.
My train of though is to replace the following pieces to improve the 2-3 shift.
1) Replace wavy front drum snap ring with solid.
2) Replace clutches and steels with Alto Red/Kolene steels.
3) Change kickdown ratio back to 3.2 ratio from current 4.2
4) Possible drill drum to increase venting of fluid.
5) Increase line pressure slightly, currently at 105 psi. I can't go too much higher or it will cause the governor to hang up. I had this problem when it was at 130 psi.
6) Change fluid from ATF+4 to Type F
I'm going to take apart the valve body today to see what the orifice sizes are in the separator plate. I know per the Trans-Go instructions I made them larger but don't recall what size I opened them too. I'll post later today after I checked.
Thanks!
Gary
Morning racers!
Last year I took the Duster racing and after upgrading the headers and tweaking made an additional 70+ hp. This made the transmission angry and you can hear the 2-3 flare towards the end of the day.
13.08 pass:
[video:youtube]
The plan this month is to fortify the transmission and replace the 3.55's with 3.90's and the car should be flying into the 12's.
The transmission is a 904 based 42RH which has been upgraded with a billet servo piston, Trans-go shift kit, 4.2 kickdown lever and 44RE front drum which holds 5 clutches.
The transmission is sort of a science project as I wanted to run the "lighter duty" 42/44RH rather than the 727 based 518RH. If guys can make 904's live behind Hemi's then I should have no problem keeping a 42/44RH behind a fairly mild 5.9.
My train of though is to replace the following pieces to improve the 2-3 shift.
1) Replace wavy front drum snap ring with solid.
2) Replace clutches and steels with Alto Red/Kolene steels.
3) Change kickdown ratio back to 3.2 ratio from current 4.2
4) Possible drill drum to increase venting of fluid.
5) Increase line pressure slightly, currently at 105 psi. I can't go too much higher or it will cause the governor to hang up. I had this problem when it was at 130 psi.
6) Change fluid from ATF+4 to Type F
I'm going to take apart the valve body today to see what the orifice sizes are in the separator plate. I know per the Trans-Go instructions I made them larger but don't recall what size I opened them too. I'll post later today after I checked.
Thanks!
Gary