Transmission Shift Points
Thread Starter
Pro
Joined: Mar 2005
Posts: 635
Likes: 118
From: Lakemont, GA
Transmission Shift Points
I have a 74 with a crate 350, th400 and 3.08 diff. I bought the car and it was set up for drag racing. I have installed the engine, differential and torque convertor. My problem is that my shift points seem very high. With very little throttle input the trans will shift in the 2600-2800 RPM range. I have checked the integrity of the vacuum lines and the trans shifts smoothly and has no abnormal noise from the unit (oh and the fluid level is correct). Is there a simple way to change the shift points of the trans?
Thanks in advance.
Thanks in advance.
Drifting
Joined: Jan 2002
Posts: 1,663
Likes: 139
From: Vail AZ
Run through it at WOT and note the shift points. If they are acceptable, your governor is set right. If they are also too high at WOT, play with the springs/weights on the governor to bring them down. Once you have that set, your part throttle shifts might fall into line. If not, get an adjustable vacuum modulator to tune it in.
Thread Starter
Pro
Joined: Mar 2005
Posts: 635
Likes: 118
From: Lakemont, GA
Thanks for the info. The gears that were in the car were 5.57s, not the 3.08s that I installed. I have not checked the WOT shift points and am waiting until I have 500 miles on the engine. Is the governor accessable without removing the pan?
Thanks again for the info.
Thanks again for the info.
Melting Slicks
Joined: Dec 2001
Posts: 2,025
Likes: 1
From: Billings MT
You running 5.57 gears!? 
Man that must be a bear just to go 55. 
Sounds like it was set up for the 1/8 mile.
You can set the normal throttle shift points with an adjustable vacuum modulator, you can set the WOT shift points by adjusting the govenor.
Man that must be a bear just to go 55. Sounds like it was set up for the 1/8 mile.
You can set the normal throttle shift points with an adjustable vacuum modulator, you can set the WOT shift points by adjusting the govenor.
Drifting
Joined: Jan 2002
Posts: 1,663
Likes: 139
From: Vail AZ
The governor is under a cap on the side near the tailshaft. Easy access & easier to play with the springs & weights. I'd hit Summit or Jegs for a governor tuning kit. They come with simple instructions and a selection of parts. Easy to mess with.
Tom
Tom
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Thread Starter
Pro
Joined: Mar 2005
Posts: 635
Likes: 118
From: Lakemont, GA
Found the trans tuning kit at Jegs. Thanks for the info, I'm not familiar with tuning autos and I appreciate all the help. I will update the post when I get a chance to play with it.
Thanks, Chris
PS, VETDRMS, that is a nice looking 74 you have!
Thanks, Chris
PS, VETDRMS, that is a nice looking 74 you have!
Last edited by silver74vette; Apr 23, 2005 at 08:34 AM.